Hello, my partner! Let's explore the mining machine together!

[email protected]

cement mill cement mill electric slag cement grinding mill

chaeng-mining equipment suppliers

chaeng-mining equipment suppliers

Slag powder is high-performing admixture for concrete in that it increases the concretes ability to resist compression, tension, shear, and bending stresses. A major trend that characterizes the building material industry is to replace equal amount of cement with slag powder in making concrete or cement products.

Cement production line is the production line composed of a series of cement production equipment, mainly involving crushing, prehomogenization, raw material preparation and homogenization, preheating and decomposition, sintering of cement clinker, cement grinding and packing and so on.

The particular heat treatment technology is used for the big gear ring manufactured by Xinxiang Great Wall Machinery which makes the improvement in the structure optimization and the hardness of the product. The wear-resistant and anti-impact performance is also enhanced greatly.

The cement kiln, also called cement rotary kiln, which is mainly used for calcinating cement clinker, is the main equipment for the new dry type cement production line. This cement equipment is mainly composed of cylinder, supporting device, supporting device with catch wheel, transmission device.

The ball mill for clinker is an efficient tool for fine powder grinding. It is mainly used to grind the clinker and raw materials in cement industry and also can be applied in metallurgy, chemical, electric power and other industries to grind all kinds of ores. Cement ball mill is not only suitable for over-flow grinding.

Our raw materials vertical roller mills are widely used in the concrete and mining fields, and are also used to process gypsum. These units can process both raw and recycled materials, while helping to reduce waste and preserve virgin supplies of these materials.

ball miller and verticle miller for cement grinding

ball miller and verticle miller for cement grinding

Applications: Mainly used in grinding operations in mining, cement, refractory, chemical and other industries. Materials: Mine ball mills are divided into dry and wet, dry type for refractory materials, cement, fertilizer, glass industry; w...

The vertical mill is divided into coal vertical mill, slag vertical mill and cement vertical mill according to the application. Cement vertical mill is pressurized by hydraulic system, and the pressure acts on the material between the grinding roller ...

In recent years, with the improvement of large-scale cloth bag dust collecting technology in China, the long bag dust collector technology used in rotary kiln tail gas treatment of cement rotary kiln with dry process method is increasing da...

Cyclone preheater is one of the core equipment in the new dry cement production process, which is responsible for many functions such as gas-solid dispersion, material heating, gas-solid separation, material transportation and some physical...

cement plant - an overview | sciencedirect topics

cement plant - an overview | sciencedirect topics

The evaluated cement plants with carbon capture based on reactive gas-liquid and gas-solid systems were modeled and simulated using ChemCAD software package. The developed models for CO2 capture were validated by comparison to the experimental / industrial data. A cement plant without carbon capture was considered as a benchmark case but it was not modelled, the main techno-economic and environmental indicators for the benchmark case were based on key references in the field (IEA-GHG, 2008).

The mass and energy balances for the cement plant concepts with carbon capture were used furthermore to evaluate the key plant performances. The designs were optimized by performing a heat integration analysis (using pinch technique) for maximization of the overall energy efficiency (Smith, 2005). As an illustrative example, Figure1 presents the hot and cold composite curves for the calcium looping cycle (Case 3).

In both investigated cases, an additional coal-based combined heat and power (CHP) unit is required to cover the ancillary energy consumption of the cement plant with carbon capture. As main energy consumptions of the carbon capture designs one can mention: thermal regeneration of the chemical solvent (Case 2) and calcium-based sorbent (Case 3) as well as CO2 conditioning (drying and compressing). The main technical and environmental indicators of the two investigated carbon capture technologies to be used in conjunction with a cement plant are presented in Table2.

As can be noticed from Table2, both cases have a small surplus of electricity (after ancillary plant consumptions were covered) to be sent to the grid. The carbon capture rate is 90% for both designs but the quantity of captured CO2 per ton of cement is significant better for Case 3 (calcium looping). Another important aspect which reflects better performances of calcium looping design in comparison to gas-liquid absorption is the fuel ancillary consumption which is about 52% lower (154MWth vs. 234MWth).

The next evaluation targeted the economic performances of the cement plant with carbon capture. For estimation of the capital expenditure (CAPEX) as well as the specific investment costs (reported as Euro per ton of cement), the cost correlation method was used (Smith, 2005). The key mass and energy flows processed through each main plant systems (e.g. cement plant, carbon capture unit, CO2 conditioning, air separation unit, power plant etc.) were considered as scaling parameters e.g. captured CO2 flow and heat provided to the looping reactors (as well as their volumes) were consideredas scaling parameters for gas-liquid absorption and calcium looping cases (Romano et al., 2013). The complete methodology of capital cost estimation using the cost correlation method is presented by Cormos (2016b). Table3 presents the specific capital investment for the main plant components as well as the total value.

As presented in Table3, the specific capital investment costs for cement plants with carbon capture are higher than for the cement plant without carbon capture (benchmark case) by about 112% for Case 2 and about 75% for Case 3. The calcium looping technology shows significantly lower investment costs than the gas-liquid absorption design due to higher energy efficiency and lower energy penalty for carbon capture.

The operating expenditure (OPEX) was estimated using a commonly used methodology (Peters and Timmerhaus, 1991). The OPEX costs can be broken in two main components: fixed and variable costs depending on their variations with plant output. Figure2 presents the fixed and variable OPEX costs for the investigated cement plants. The carbon capture designs have higher OPEX costs compared to benchmark case with about 90% for gas-liquid absorption case and about 60% for calcium looping case.

The cement production cost significantly increases when CO2 capture is applied (95% for gas-liquid absorption and 63% for calcium looping) as well as CO2 avoided cost. However, calcium looping method shows far better values than gas-liquid absorption.

The audited cement plant contains nearly 94 Mots whose power is greater than 18 kW and that are not equipped with VFD. These Mots belong to the IE1 energy class (according to the classification of IEC 60034-30). Table 11 presents the main operating characteristics of these Mots.

From Table 11, it can be observed that several Mots operate at low charge levels (e.g., Mot 12, 33, 41, and 52). Therefore, installation of VFD for these electric Mots could be considered as a potential solution to reduce energy consumption.

The Ramla cement plant (see Fig. 1 for an aerial photo of the plant) has been in operation for 46 years. The original process at the Ramla cement plant to produce cement from limestone, which is the base material of cement, was a so-called wet line process. The original wet line had a capacity of 1,800 TPD (Tons Per Day). The first new production line producing cement through a so-called dry line process was commissioned in 1994. This line has a capacity of 5,000 TPD and is very successful. Building on its success, Nesher decided to build a second dry line. On the 10th of August 1997, Benjamin Netanyahu, Israel's former Prime Minister, laid the cornerstone at the Ramla plant for the second 5,000 TPD dry line. The new dry line, which is currently in the running-in stage, will join its 5,000 TPD sister dry line and the older 1,800 TPD wet line. The wet line will be phased out soon and thus the anticipated new total plant capacity will be 10,000 TPD. To save costs, Nesher decided to use the existing limestone handling and transport facilities to handle the increase in transport loads. This was made possible by relatively minor modifications to the existing infrastructure. in particular to the belt conveyor system. The raw materials needed to supply all three plants are now transported from a quarry 3.5 km away from the plant via the existing (upgraded) conveyor belt system.

Cement plants have been conserving water in their plants from the beginning as most cement plants have had to make their own arrangements to obtain water required for the plant and for drinking and household purposes.3.1.1.Cement plants procure water from the nearest perennial sources of water like rivers and streams by digging wells in their beds and pumping it and storing it in the plant/quarries/housing colony.3.1.2.Plenty of water is required even in dry process cement plants to cool bearings, compressors, after-coolers, gearboxes and for conditioning towers preceding ESPs. All water used for cooling is invariably collected and taken to a cooling pond and recirculated in the system. Only 10-15% water is added to allow for loss by evaporation.3.1.3.Process water is not required in a dry process cement plant. However if an ESP is used to clean preheater exhaust gases, a cooling tower is necessarily installed to bring down the temperature to about 140C. Gases are cooled by spraying water on the gases in the cooling tower. Water evaporates and is consequently lost. This is a significant quantity.3.1.4.This loss of water can be avoided if the ESP is replaced by a bag filter. However penalty there is a penalty for the higher pressure drop in the bag filter and the necessity of cooling gases to ~120140C by admitting ambient air to suit the materials of bags. If glass bags which can stand a temperature of ~275C are used this dilution can be avoided. Generally speaking the ESP can be avoided at the design stage itself if the plant is located in an area of scanty rains and water scarcity.Performance of the ESP is uncertain during startup and closing down periods. Presently the trend is to avoid an ESP for this reason also.

Plenty of water is required even in dry process cement plants to cool bearings, compressors, after-coolers, gearboxes and for conditioning towers preceding ESPs. All water used for cooling is invariably collected and taken to a cooling pond and recirculated in the system. Only 10-15% water is added to allow for loss by evaporation.

Process water is not required in a dry process cement plant. However if an ESP is used to clean preheater exhaust gases, a cooling tower is necessarily installed to bring down the temperature to about 140C. Gases are cooled by spraying water on the gases in the cooling tower. Water evaporates and is consequently lost. This is a significant quantity.

This loss of water can be avoided if the ESP is replaced by a bag filter. However penalty there is a penalty for the higher pressure drop in the bag filter and the necessity of cooling gases to ~120140C by admitting ambient air to suit the materials of bags. If glass bags which can stand a temperature of ~275C are used this dilution can be avoided. Generally speaking the ESP can be avoided at the design stage itself if the plant is located in an area of scanty rains and water scarcity.

The steam is condensed in condensers and returned to the circuit. Water used to condense steam is itself cooled in cooling towers operating in a closed circuit; that water is used again by recirculation. Therefore, only makeup water is required. The same is true of waste heat recovery boilers. Even where DG sets are used to generate power, diesel engines are cooled by water which in turn is cooled in cooling towers and returned to the circuit.

This water is generally wasted after use, though sewage water can be used after treatment for nondrinking purposes like gardening. As a matter of fact authorities who sanction a cement plant project stipulate that a sewage treatment plant has to be installed in the plant. There should be zero effluent discharge from the plant.

Often, as mines get developed, underground resources of water become available and actually supplement the main source of water. Pits in excavated/exhausted mines can be used to serve as reservoirs of water. These are available year round for mining machinery and crushing plant when located in mines.

Often, currently, used mines are consciously developed and landscaped to serve as recreation or picnic spots. Reservoirs in mines thus serve a dual purpose, as a source of water and as lakes. When treated the water can also be used in swimming pools.

Presently there is great emphasis on greening of the plant and its surroundings, including the housing colony. Green belts are created around the plant and colony to serve as dust and sound barriers. It is mandatory to create such belts between the plant and the highway/township.

In the context of cement plants, rainwater harvesting (RWH) has many dimensions.1.Rainwater is collected and stored in natural/artificial ponds or lakes to counter the salination of groundwater in coastal areas.For this purpose check dams are constructed across streams and rivulets.2.A system called garland canals is constructed to collect the groundwater and lead it to reservoirs in quarries or reservoirs created by check dams.This water can be used in the cement plant for manufacturing, in captive power plants, and for domestic use in colony.As a matter of fact many cement companies are supplying water for drinking purposes and for agricultural purposes to neighboring communities on an increasing scale. Some have installed desalination plants also.The authorities sometimes stipulate that the cement company should not draw water from an adjoining river/stream.3.RWH is used to recharge bore wells within the plant's own area and colony.Water is collected from rooftops and led through pipes to collection pits near the bore wells to recharge them. Water is then available year round, even in summer months.

As a matter of fact many cement companies are supplying water for drinking purposes and for agricultural purposes to neighboring communities on an increasing scale. Some have installed desalination plants also.

Extracts from a typical letter of consent for a cement plant project at a green field site or for an expansion show the emphasis the authorities are putting on water conservation. Cement plants of the future will have to be green. See Annexure 1.

Waste oil is a unique hazardous waste with a long history of utilization. Typical sources of waste oil include automotive oils, machinery cutting and cooling oils, and other sources of lubricants. The opportunities to use this material as an opportunity fuel are worldwide. U.S. waste oil production and consumption exceeds 4.2 109 l/yr (1.1 109 gal/yr), of which 67% is burned as fuel and another 4% is rerefined [74]. A significant quantity is generated in Canada annually as well. Blundell [74] reports that 200 106 250 106 l/yr (53 66 106 gal/yr) of waste oil is generated in the Ontario province alone; of this 15% is burned in cement kilns, 7% is burned in small furnaces, and 27% is refined again.

In the United Kingdom, 447,000 tonnes of waste oil are generated annually, of which 380,000 tonnes are usedlargely as fuel [75]. Significant attention has been given to this waste disposal problem/energy resource opportunity in such other locations as Bulgaria [76], New Zealand [77], Spain [78], and throughout the European Union. States from California [79] to Vermont [80] are paying particular attention to waste oil, its use as a blending fuel, and its proper disposal.

The general fuel characteristics of waste oils are shown in Table 5.21. Note the differences between mineral oil and synthetic automotive oil. Note also the broad range in properties, particularly as associated with mineral oil.

Typical trace metal concentrations have also been measured in waste oils, as shown in Table 5.22. Note that there are significant differences between typical concentrations in the United States and in New Zealand.

There are three basic uses of waste oil as a blending fuel: in small space heaters and boilers, in larger boilers, and in cement kilns. Of these, cement kilns are the most prominent due to their continued search for low-cost alternatives to coal, oil, and traditional energy sources. In New Zealand, for example, two cement kilns dominate the use of all waste oil in that country. Typical emissions from the combustion of waste oil in various applications are shown in Table 5.23. Note that SO2 is not shown in this table because of its dependency on the sulfur content of the incoming fuel.

Given the typical emissions associated with firing waste oils, it is useful to consider case studies of firing waste oils in cement kilns [8284]. Therefore, an example of cofiring waste oils in cement kilns in Germany is presented.

A study utilizing data from cement plants in Germany was done to estimate the emissions of various metals as a function of waste material [83]. There are 76 cement kilns in operation, of which 40 are permitted to use alternate fuels such as tires, waste oil, waste wood, and so forth. A typical cement kiln consisting of a raw mill section, a preheater-rotary kiln section, and a cement mill section was used to describe cement production in Germany. Using partitioning factors based on information from operating kilns, a mass balance model was developed for this typical kiln. Using this information, elemental distributions were calculated for cadmium, lead, and zinc when using waste oils at the maximum allowable rate of 30%. The results are shown in Table 5.24. The results show that nearly all the trace metals exit with the clinker, and destruction and removal efficiency (DRE) numbers for the three metals are estimated to be 99.96% for lead, 99.95% for zinc, and 99.94% for cadmium.

A green cement plant is one that is designed to conserve natural resources of all kinds and that contributes to the release of the greenhouse gases (GHG) to the atmosphere to the least possible extent consistent with the quality of cement produced.

Release of CO2, a greenhouse gas, is inherent in the process of the manufacture of cement, as CO2 is released from limestone, the basic raw material of cement during the process of calcining. One kilogram of calcium carbonate releases 0.44kg of CO2. Therefore, in making 1kg of clinker, approximately 0.51kg CO2 gets released into the atmosphere.

A vital component of total carbon dioxide released to the atmosphere is the CO2 released in the process of combustion of fuel fired in the kiln and calciner in the clinkerization process. The quantum released is directly related to the quantum of fuel fired and the quantum of carbon in it.

Again, by the same logic, the obvious way to reduce emissions is to reduce the heat requirement, or what is called specific fuel consumption, and/or to use fuels with less carbon or those that are carbon neutral.

Alternate fuels have been successfully used in many countries in kilns and calciners. In Europe the cement industry is progressing toward zero fuel costs. Great possibilities exist for using wastes of industry and agriculture that have heat value as secondary fuels in kilns and calciners.

Production of cement also requires a supply of electrical energy, expressed as kwh/ton of cement. Electrical energy is presently produced mostly by burning fossil fuels like coal and oil. Thus reduction of electrical energy by making cement indirectly means a reduction in electrical energy produced and thereby in GHG released to the atmosphere. If 1 kwh is used in a cement plant, the generating station has to produce much more to allow for transmission losses and for its own inputs. In some countries transmission losses are small, say 10%, but in some countries (India for one) they are more than 30%.

Cement plants can further contribute significantly to reducing GHG emissions by converting waste heat in the exhaust gases from the kiln and cooler into electricity using waste heat recovery systems (WHRS). There is plenty of scope in existing dry process cement plants to produce power from waste heat.

Due to recent developments in technology it is now possible to generate power even from waste gases in modern cement plants with low heat contents by using the organic Rankine cycle and the Kalina process. It is estimated that between 20 to 30% of the energy required by a cement plant can be generated by installing WHRS. Energy so generated can be used in the plant or fed to the grid.

All fossil fuels emit CO2. Biomass fuels are carbon neutral. Sources of energy like wind, solar and hydraulic are not only totally free of carbon but on top are renewable, and also inexhaustible. Increasing attention is being paid to making them viable sources of energy.

Thus, making or designing a green cement plant in effect means:1.providing facilities for making blended cements in an adequate measure2.designing components like calciners to reduce obnoxious gases like NOx, SO2, etc.3.provide providing for processing and firing alternative fuels which will reduce the quantum of CO2 released4.designing burners and firing systems for available alternative fuels5.if required, providing for bypass of kiln gases which can contain excessive alkalis and chlorides as a result of firing certain alternative or waste fuels6.providing for waste heat recovery systems to generate power or for other applications7.consideration of making composite cements, which are a form of blended cements1.8.1.To this list will soon be added:1.using/making substitute cements2.using renewable energy

There are developments which aim at reducing the GHG emissions by physically collecting CO2 emitted and storing it and making it available to other industries that have use for it, and even for making cements of new types.

Apart from the two major aspects described regarding sustainability and GHG emissions there is more to making a cement plant green:1.keeping the environment green by planting trees and taking up schemes for afforestation2.adopting more scientific mining methods that cause minimum damage to the environment by minimizing mining footprints3.reclaiming used mines for landscaping, creating water reservoirs, etc.4.creating green belts in and around plant and colony5.installing water conservation schemes like rainwater harvesting, water treatment for recycling6.designing and constructing green buildings in the cement plant wherever possible to make maximum use of natural light, ventilation, etc.

The cement industry is consciously making efforts in various areas (listed in section 1.8) and is very much interested in making existing plants green and in designing new plants as green plants.1.11.1.Blended cementsPresently almost all cement plants the world over are making blended cements. In India itself ~ 74% of cement made is blended cement. Slag adding up to 60% has been used up. Fly ash is available but further increase in the quantum of Portland Pozzolana Cement (PPC) is limited unless the ceiling to which fly ash can be added is raised. This change can only be sanctioned by national entities that govern standards of cement, like the Bureau of Indian Standards in India.1.11.2.Alternate fuelsThe main problem is the selection of a fuel that is steadily available in required quantities over a long period of time and which would have reasonably uniform physical and chemical properties, such as calorific value.1.11.3.Waste heat recoveryIntroducing waste heat recovery systems requires heavy capital investment and therefore requires careful planning and engineering.In the subsequent sections and chapters all these aspects have been covered in detail so as to present a comprehensive picture of what it takes to make a green cement plant.

Presently almost all cement plants the world over are making blended cements. In India itself ~ 74% of cement made is blended cement. Slag adding up to 60% has been used up. Fly ash is available but further increase in the quantum of Portland Pozzolana Cement (PPC) is limited unless the ceiling to which fly ash can be added is raised. This change can only be sanctioned by national entities that govern standards of cement, like the Bureau of Indian Standards in India.

The main problem is the selection of a fuel that is steadily available in required quantities over a long period of time and which would have reasonably uniform physical and chemical properties, such as calorific value.

All over the world, sizes of cement plants have increased both as single production units and also in terms of total capacity in one place. Basic processes and, hence. stages of manufacture in green cement plants are the same as those in conventional cement plants. When making blended cements, both the requirements of limestone for a given capacity of the plant and also the area for mining lease reduce drastically.

With the size of the plant capacities of individual machinery, units like crushers, mills, and kilns also increase correspondingly. Therefore, increases in the size of a plant should be accompanied by growth and developments in cement making machinery so as to maintain, and even improve, efficiency and productivity of cement plants.

It is economical to have a single production unit for a given capacity. This would have been difficult without developments like low pressure drop cyclones for preheaters, vertical roller mills with multi drives, high efficiency separators, roller presses, and a number of ways these can be integrated in circuits. Various developments in designs of clinker coolers with+70% efficiencies, developments in designs of low nox calciners, and two support kilns are just some of the developments that have made large green cement plants a reality. Features like co-processing alternate fuels and waste heat recovery systems are also integral parts of large green plants.

With the size of the plant, the quantities of bulk materials to be handled and stored increase correspondingly. A balance has to be struck between economy and continuity of operation in planning layouts of large cement plants. Multiple units are installed to maintain continuity of operation in the event of breakdowns.

New, large plants make at least two types, sometimes more, of cements. Hence, sections of cement grinding, storage, and dispatches have to be planned carefully to cater for the market in the best possible manner. Dispatches can be by road, rail, (even by sea in case of exports), and in bagged or bulk cement. The plant has to plan its facilities carefully, taking these factors into account. Split location has become common.

Operating efficiencies of large plants are highsp. fuel consumption is around 650 - 700kcal/kg clinker; sp. power consumption is between 65-80kwh/ton; and man hours required per ton of cement are as low as 0.15.

Because of their size, it is possible for large plants to invest in renewable energy, such as solar or wind power. Automation and process control are of an advanced nature. New concepts using key performance indicators (KPI ) and dashboard control are coming in vogue. Large plants have to integrate and manage three or more power systems like grid power, captive thermal power, waste heat recovery power, and also solar or wind power. This, itself, is a challenging job.

cement vertical mill for sale

cement vertical mill for sale

The vertical mill is divided into coal vertical mill, slag vertical mill and cement vertical mill according to the application. Cement vertical mill is pressurized by hydraulic system, and the pressure acts on the material between the grinding roller and the grinding disc to achieve the purpose of grinding, vertical High grinding efficiency, 20-30% energy saving than ball mill; can simultaneously dry materials with up to 10% moisture; product fineness is easy to adjust; product particle size distribution is uniform; system process is simple; small footprint; low noise Less dust; easy operation and maintenance. With the improvement of vertical grinding technology, it has also been applied in the fields of medicine and food.

The vertical mill consists of a separator rotation system, a separator part, and an upper casing part upper casing with an inspection door and a feed port, a roller device, a transmission device, a tie rod portion, a disc seal, an upper and lower side, a side friction ring, and an unloading material ring, grinding disc adjusting device, air ring adjusting device, grinding roller pressing system, guide rail protection device, tie rod sealing device, bearing sealing air supply part, inlet oil groove part, internal air pipe sealing, powder selection hydraulic lubrication system.

The motor drives grinding disc to rotate through reducer, and raw material falls from the feeding port to the center of grinding disc, and hot air enters the grinding chamber from the air inlet. Under the action of centrifugal force, the material moves to the edge of grinding disc, and is crushed by the grinding roller through the annular groove on the grinding disc. Pressed and pulverized, the pulverized material is taken up from the edge of grinding disc by the high-speed airflow of wind ring. The large particles fall directly on the grinding disc and re-grind. When raw material in the airflow passes through the classifier, the coarse powder falls under the action of the rotating rotor. The grinding disc is re-grinded, and the qualified fine powder is ground together with airflow and collected in the dust collecting device, which is final product. The moisture-containing material is dried during contact with the hot air.

In recent years, with the improvement of large-scale cloth bag dust collecting technology in China, the long bag dust collector technology used in rotary kiln tail gas treatment of cement rotary kiln with dry process method is increasing da...

Cyclone preheater is one of the core equipment in the new dry cement production process, which is responsible for many functions such as gas-solid dispersion, material heating, gas-solid separation, material transportation and some physical...

vertical raw mill | cement raw mill | raw mill in cement plant

vertical raw mill | cement raw mill | raw mill in cement plant

Vertical raw mill is one kind of raw mill, generally used to grind bulk, granular, and powder raw materials into required cement raw meal in the cement manufacturing plant. Vertical raw mill is an ideal grinding mill that crushing, drying, grinding, grading transfer set in one. It can be widely used in cement, electric power, metallurgy, chemical industry, non-metallic ore, and other industries.

Foundation support: The foundation seat of the vertical raw mill is a set of steel welding parts, which is buried in concrete. The driving device of the vertical raw mill and the fixed seat of the tensioning hydraulic cylinder are installed on the foundation support.

Grinding table liner: The wear-resisting liner is fastened on the grinding table and the grinding roller rotates on the wear-resisting lining plate. The raw material is ground between the grinding table and the grinding roller.

Grinding roller: There are four grinding rollers, which are distributed on the grinding table. The diameter of the grinding roller is 2240m. When the grinding table liner and roller skin reach a certain limit of wear, it shall be replaced.

Hydraulic tension system: the hydraulic cylinder produces the pressure needed for the grinding roller to tighten, and the tension rod transmits the tension force of the hydraulic cylinder. The hydraulic cylinder is equipped with a nitrogen airbag to absorb the vibration of the raw mill during operation.

Auxiliary drive: The main engine drive is equipped with an auxiliary drive device, which can make the vertical raw mill start smoothly. The auxiliary drive is also used for the accurate position required in the inspection of the grinding table and the maintenance of the grinding roller.

Grinding: The raw material enters into the grinding through the sliding tube. Under the action of centrifugal force, it moves circumferential around the center of the grinding disc and radially outward along the grinding disc to enter the grinding area. There is a retaining ring around the mill, and the material forms a material bed on the vertical raw mill.

Selecting: except part of the fine powder is discharged with the airflow, and the rest of the material overflows from the retainer ring and is fed into the dynamic cement separator by the external circulation bucket elevator. The fineness of the finished product is R0.09 < 12%, and the coarse material is re-put into the vertical raw mill.

Drying: The heat source of drying materials comes from the 300 hot flue gas in the preheater at end of the cement rotary kiln, which is divided into two ways and sent to the vertical raw mill and the stepped cement separator respectively, and then into the dynamic cement separator and electric dust collection.

cement ball mill - jxsc machine

cement ball mill - jxsc machine

The cement ball mill is mainly used for grinding the finished products and raw materials of cement plants, and is also suitable for grinding various ore and other grindable materials in industrial and mining enterprises such as metallurgy, chemical industry, and electric power. Cement grinding is the last process of cement production, it is to mix cement clinker and a small amount of gypsum, and then grind the mixture to a certain fineness, that is cement. You may also interest in the ball mill product price, lime ball mill, quartz ball mill. Cement grinder types Cement ball mills can be divided according to discharge method: grate ball mills and overflow mills, and can be divided into wet mills and dry mills according to their processing conditions.

The main working part of the cement grinding mill is a rotary cylinder mounted on two large bearings and placed horizontally. The cylinder is divided into several chambers by a partition plate, and a certain shape and size of grinding bodies are installed in each chamber. The grinding bodies are generally steel balls, steel forgings, steel rods, pebbles, gravel, and porcelain balls. In order to prevent the cylinder from being worn, a liner is installed on the inner wall of the cylinder. When the cement grinding machine rotates, the grinding media adheres to the lining surface of the inner wall of the cylinder under the action of centrifugal force and frictional force with the lining surface of the inner surface of the cylinder, and rotates with the cylinder and is brought to a certain height. Under the action of gravity, it falls freely. When falling, the grinding media acts as a projectile and impacts the material at the bottom to crush the material. The cyclic motion of the abrasive body rising and falling is repeated. In addition, during the rotation of the mill, the grinding body also slides and rolls, so the grinding action occurs between the grinding body, the liner and the material, making the material fine. As new materials are continuously fed at the feed end, there is a material level difference between the feed and discharge end materials to force the material to flow, and the axial thrust of the impact material when the grinding body falls also breaks the material flow. Air movement also helps material flow. Therefore, although the mill barrel is placed horizontally, the material can slowly flow from the feed end to the discharge end to complete the grinding operation.

Ball mill liner The liner of cement dry-type ball mill can be divided into ceramic, granite, rubber, high manganese, magnetic liner and other materials. The function of liner is mainly to protect the cylinder from the direct impact of materials and steel balls and extend the service life. At the same time, the liner plate can also adjust the running track of materials. Generally, the head grinding bin is equipped with hard liner plate, which can enhance the impact force of materials and accelerate grinding. The liner plate of the fine grinding bin is corrugated liner plate or flat liner plate, which can enhance the grinding effect of materials.

Ball mill grinding medium The grinding medium of cement dry ball mill includes steel ball, steel rod, steel pipe, stone, porcelain ball, etc. the steel ball is divided into cast iron, bearing steel, carbon steel and other materials, and the diameter of steel ball varies from 15mm to 125mm. The steel bar is short cylindrical or conical, which has line surface contact with the material and strong grinding effect.

Cement ball mill advantages 1. It has strong adaptability to materials, continuous production and large processing capacity. The equipment has stable performance, is convenient for large-scale production, and meets the needs of large-scale production of modern enterprises. 2. The crushing ratio is large, the feeding size can reach 50 mm, the discharging particle size can be controlled, and the particle quality is good. 3. Cement dry-type ball mill is mainly used for grinding raw materials and clinker (finished products and raw materials) in cement plant, and also for grinding various ores and other grindable materials in metallurgy, chemical industry, electric power and other industrial and mining enterprises. It can be used for open flow grinding and circular flow grinding composed of powder concentrator. 4. The structure is reasonable, firm and can be operated under negative pressure. Cement dry ball mill has good sealing performance, environmental protection, simple maintenance, safe and reliable operation. Disadvantages But at present, the overall efficiency of cement dry-type ball mill grinding is low and energy consumption is large. Although the rolling bearing transmission mode is used now, the cement mill process is still the most power consuming part of the enterprise. Moreover, the cement dry-type ball mill is generally medium and long grinding, with large investment and high cost.

The application of ball mill in cement industry dates back more than 100 years. The ball mill for cement grinding plant is mainly of high fineness, dry grinding method, and the process is mainly of open circuit process and closed circuit process. The equipment of ball mill used in cement plant includes vertical cement mill, roller press and ball mill, etc.

The cement ball mill in cement plant is usually divided into 2-4 silos, the most representative of which are the new type of high fineness cement ball mill and open flow high fineness cement ball mill. There are three cement processing circuits. 1. Open circuit grinding The ball mill in the cement plant for open circuit grinding consists of grinding bin, dust collector and ball mill. Advantages: the cement plant process is the simplest, with less investment and simple operation and maintenance. Disadvantages: serious over grinding in the mill, low efficiency, difficulty in fineness adjustment of finished products, high power consumption.

2. Closed circuit grinding Closed-circuit grinding is widely used in cement mills all over the world. Cement grinding unit is widely used in the United States, Germany, France, Japan and other developed countries. For example, 95% of cement in Japan comes from closed-circuit grinding. The cement plant machinery of closed-circuit grinding consists of feeding system, finished product bin, powder concentrator and dust collection equipment. The process is relatively complete. The disadvantages are a large investment, many equipment and complex operation.

According to many years of practical production experience, JXSC summarizes that cement producers with a production capacity of fewer than 30 tons per hour are suitable for open circuit grinding, and closed-circuit grinding for large-scale production can be more economical.

Matters need attention 1. Cement has corrosion, which affects the service life of steel ball and increases the production cost. 2. Different wear-resistant microelements in different materials of wear-resistant steel balls will be damaged, which will cause poor wear-resistant effect and serious waste of clinker grinding mill. 3. During cement grinding, the material temperature may be higher than 100 , leading to dehydration of most gypsum or complete dehydration, causing coagulate of cement, which requires corresponding cooling measures, including mill ventilation, cylinder water cooling, etc. 4. After each clinker grinding, clean the cement grinding system, so as to avoid inconvenience to the next start-up due to slag material deposition.

Cement mill price Cement ball mill specially used for grinding cement clinker and other materials in building materials, cement production, metallurgical ceramics, electric power and petrochemical industry. JXSC can design and manufacture special cement ball mill equipment according to the output and fineness requirements of users. Contact us for machine selection and a price quotation.

raw mill, cement raw mill, raw mill in cement plant | cement equipment

raw mill, cement raw mill, raw mill in cement plant | cement equipment

Raw mill is generally called cement raw mill, raw mill in cement plant, it refers to a common type of cement equipment in the cement plant. In the cement manufacturing process, raw mill in cement plant grind cement raw materials into the raw mix, and the raw mix is sent to the cement kiln to make cement clinker, next, clinker and other admixtures will be ground into finished cement by cement mill.

As for the type of raw mill, there are two types including cement ball mill and vertical cement mill. In the traditional cement raw mill system, the cement ball mill system is more typical. After technology modification, the vertical cement mill has obvious advantages compared with the cement ball mill, and it is suitable for the large cement production line.

AGICO CEMENT is a raw mill manufacturer from china who has the ability to manufacture cement ball mill and vertical cement mill. As a leading and trusted manufacturer, we had exported many projects of cement raw mill and cement equipment to the countries or regions around the world. Why AGICO CEMENT is popular?

Vertica raw mill, also known as vertical roller mill, in the 1920s, the first vertical raw mill in cement plant is designed in German. It is widely used in cement, electric power, metallurgy, chemical industry, and other industries.

Low investment: the vertical raw mill set crushing, drying, grinding, grading transportation in one, simple system, compact layout, less space, it also can be arranged in the open air, save a lot of investment costs.Low operation cost: small energy consumption and less damage reduce the running cost.Environment protection and clean: small vibration, low noise, and good sealing, the system works under negative pressure, no dust overflow.Stable quality of raw mix: because the material stays in the raw mill for a short time, it is easy to detect and control the product size and chemical composition, reduce repeated grinding, and stabilize the product quality.

The main motor drives a millstone by rotational speed reducer, at the same time the wind enters into the raw mill from the air inlet, material through the screw feeder fell in the middle of the raw mill, under the action of centrifugal force, the raw materials move uniformly from central to the edge of the millstone, the materials will be ground by the roller when it passes through the grinding roller way, large materials are directly crushed. Crushed material continues to move to mill edge, until being taken away by the wind ring in strong turbulence, and larger particles material again fell to the mill to continue to crush, the flow of materials through the upper part of the separator, in the effect of separator blade, coarse particle back to the grinding mill, qualified fine powder with airflow is out of the raw mill, and collected by the powder collection.

The cement ball mill usually can be applied to raw meal grinding or cement grinding. Besides, the cement ball mill also can be used for metallurgical, chemical, electric power, other mining powder grinding, and other grindable materials.

Safe and reliable system: the maintenance of the reduction gear and gear is more convenient, firm and wear-resistant, and also reduces the downtime, maintenance time and the labor intensity of the operators.

Good wear resistance and long service life: Cement ball mill adopts the high-quality wear-resisting material, and the lining can be removed, therefore the service life of the equipment or vulnerable part is all longer.

The main working part of cement ball mill occurred in the low-speed rotary cylinder, when the cylinder is drove to rotary, grinding medium is attached on the liner to rotary together due to the effect of inertial centrifugal force, and taken to a certain height, freely fall because of gravity, grinding medium break the materials in the cylinder body, at the same time the grinding body in the rotary raw mill have circular motion, also can produce sliding and rolling, which result in grinding among the grinding medium, liner, and materials. When the material is crushed and ground by impact, the material flows slowly from the feeding end to the discharging end to finish the grinding operation.

The raw mill is a kind of necessary cement equipment in the cement plant. In the real working condition, but the large configuration will produce a bad effect on the cement plant, so it is very important to set a reasonable configuration of the raw mill. There are five reasons why we control the configuration of the raw mill in cement plant:

Composition fluctuation of the raw meal: The frequently start-stop of a raw mill will bring different degrees of influence on the quality, whether it is the cement ball mill, the vertical cement mill or the cement roller press system.

Related News
  1. process of manufacturing cement
  2. carbon regeneration kilns in gold mining
  3. cement zand verhouding
  4. daya rotary dryer
  5. kiln drying wood services
  6. mini stone concrete crushers
  7. cement plant duct auto design
  8. rotary kiln for lime plants
  9. concrete crusher new mexico for rent
  10. rotary dryer kya h in hindi
  11. coal slag briquetting machine manufacturer china
  12. rock pulveriser manufacturer in india
  13. chemiebau rotary dryer
  14. soft stone crusher drum type
  15. used clincker grinding plants
  16. flotation cell 5d
  17. process stone ball mill mine crushing machinery
  18. sand washer&dryer set
  19. small bentonite flotation cell in kigali
  20. rud bucket elevator chain