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grinding mill for cement plant

cement grinding unit | cement grinding plant | epc project

cement grinding unit | cement grinding plant | epc project

Cement grinding unit, or called cement grinding plant, is an individual grinding plant in the finished cement production. The new-type cement grinding units adopt pre-grinding technology. The cement grinding units not only reduce the particles of feeding materials, but also help to produce cracks and flaws inside the particles, which largely increase production capacity of cement mill, reduce the energy consumption.

The cement grinding machine includes cementdryer, cement ball mill, cement roller press, powder selecting machine, conveyor and other cement equipment. We can provide scheme design for free according to the requirements of users, and offer appropriate equipment to ensure smooth production with less investment and high profit.

The cement grinding process include the admixture crushing, cement batching station, pre-crushing, high and fine powder grinding, fine powder separation, dust treatment, automatic control and other technologies. The finished cement can meet the requirement for high yield, high quality and energy saving.

As a professional EPC project provider, we have the ability to provide the custom-design solutions to cement manufacturing for every client. Our solution covers all stages including equipment installation, operation, production, maintenance, we will send technicians to guide training, until the customer is satisfied.

For the structure, of the cement mill, we adopts the advanced obstructing equipment for internal powder, add the activated device to the fine grinding chamber, and there is the special grate plate at the end of the cement mill, which can reduce the size of the grinding medium, greatly improve the grinding efficiency, and achieve the purpose of high output and low energy consumption.

The cement grinding unit has advantages of simple structure, strong controllability, and easy to operate or maintain. The discharge concentration is less than 50mg/Nm3, lower than the discharge standard, and protect the environment of the production site effectively.

The production process overcomes the disadvantages of traditional equipment. The fineness of product is easy to be adjusted, apply for different requirement of fineness. The equipment also has advantages of large heat dissipation area and low temperature inside mill. The finished product of new-type cement grinding unit has high quality and large capacity.

As for the layout, the cement grinding unit is built near the sales market of cement. The most of cement admixture is the industrial residue, and cement grinding plant can greatly consume the industrial residues like slag, fly ash, slag, coal gangue. So the cement grinding unit brings green benefits well.

Traditional cement factories belong to high-pollution and high-energy consumption industries and do not meet the goals of energy conservation and consumption reduction in the development of modern industry. Cement grinding unit is a key link in cement plant. To achieve energy saving and consumption reduction in the cement industry, we must proceed from the cement grinding unit. Through a series of research and analysis, the following seven methods can effectively reduce the energy consumption of cement grinding plant.

Make full use of various industrial waste slags, such as blast furnace slag, steel slag, fly ash, and burned coal gangue. These waste slags are treated at high temperature and help to improve the performance of cement. At the same time, it also reduces the particle size of the grinding material, which can reduce the power consumption per unit product.

Under the fixed process conditions, when the 45m sieve residue and specific surface area of cement are controlled at a reasonable level, particles below 3m and above 45m can be limited, so as to obtain good cement performance and lower production costs. Compared with other methods, this fineness control method has the advantages of simple operation and effective control. As long as a sample is taken for a sieve analysis test and specific surface area determination, it can provide a basis for the operation of the cement mill.

In the cement grinding process, a small amount of admixture is added to eliminate the adhesion and aggregation of the fine powder, accelerate the grinding speed of the material, improve the grinding efficiency, and also increase the content of 3-30m by 10-20%, which is conducive to the high-quality, energy-saving and high-yield of cement ball mill. Such additives are collectively referred to as grinding aids. In most cases, the use of grinding aids can increase the output of the cement ball mill without changing the cement production process, the purpose of improving the quality of cement production line, reducing costs, and producing green high-performance environmentally friendly cement can be achieved.

In the cement production process, the use of new technologies and processes can greatly reduce energy consumption, save investment, and achieve economic benefits. Such as multi-point feeding, multi-point retrieving, circulating grinding process; extruder combined grinding process, etc. At the same time, we must vigorously promote to use energy-saving cement grinding equipment. For example, instead of traditional cement ball mills, select new type cement vertical mills, trapezoidal mills, and other energy-saving cement grinding equipment.

At present, these two measures are the main reform directions for the cement mill optimization. The following effects can be achieved: the output is increased by 30% -60%, the power consumption is reduced by 25% -40%, and the power consumption per ton of cement is reduced by 8-12kWh. It can effectively increase the strength of cement. Generally speaking, the strength of cement can be increased by more than 5MPa.

Frequency conversion technology is one of the energy-saving technologies. This technology can help some auxiliary equipment in cement plant to save energy, such as fans, batching metering, and variable-speed equipment. At the same time, it also meets the characteristics of low-speed operation and large starting torque of the cement ball mill and realizes the continuous adjustment of the running speed of the cement ball mill. There is no inrush current when the motor starts, the starting distance is sufficient, and the protection function is perfect. Ensure the quality of process control and save maintenance costs.

The use of low-voltage motor full-phase control technology, it has the advantage of automatically adjusting the output power of the motor when the load is lightly loaded and heavily loaded so that the motor can save electricity by 15% at the time. Adopt a green lighting system, through these technical measures, greatly improve the power factor, reduce the reactive power demand, and reduce the loss of active power.

In general, correctly coordinating the relationship between quality, output, and the energy consumption is the basic way for cement grinding to save energy and reduce consumption. Traditional cement mills have low energy utilization rate and do a lot of useless work. The energy-saving technology should be the basic task of transforming the cement grinding process, and all these need to be established on the basis of a certain quality index control. To achieve a reasonable particle ratio of cement materials, it should meet the gradation requirements of performance, and add an appropriate amount of industrial waste residue.

cement euipment overview | cement making machines | cement plant

cement euipment overview | cement making machines | cement plant

How much do you know the cement equipment? Cement equipment refers to the cement making machines that are applied to the cement manufacturing plant. Before learning the cement equipment, we learn the process of cement manufacturing process first.

In general, we can divide the cement production line into three main steps: raw material preparation of cement, clinker production, and finished cement. Each step has some cement manufacturing machines, such as raw mill, cement crusher, cement mill, cement kiln, cement cooler, cement dryer, cement silo, packing machine, etc.

As we all know, the first step of the cement production line is raw material preparation. Cement crusher is the main equipment of this step. The raw materials are fed into cement crusher by vibratory feeder; the breaking material is transported by the belt conveyor to the impact crusher for further crusher.

There are various types of cement crusher on the market, including jaw crusher, cone crusher, hammer crusher, impact crusher, and etc. AGICO Cement can provide all types of cement crusher. Our cement crusher can fully crush the raw material, reduce feed size into the mill, and increase the reaction of raw material in the following cement manufacturing process, reduce the energy consumption of the whole cement production line.

Cement mill is another necessary cement equipment of the cement plant. After raw material crushing, cement mill plays vital role in the further cement manufacturing process. Cement ball mill, vertical cement mill, and cement roller press are common types of cement grinding plant.

Cement mill has two functions of the cement production line. Firstly, cement mill is used to grind the crushed material into fine size before clinker production. A cement mill is also applied for grinding clinker into finished cement. The cement clinker grinding is the last step of the cement manufacturing process, in this step, cement mill grinds cement clinker, gelatinizing agent and other materials into the required size, which can meet the requirement of cement.

AGICO Cement adopts the advanced internal selection and special compartment device, add the activation device. The grinding tail has a special discharge grate plate, which greatly reduces the size of the grinding media of the grinding bin, greatly improves the grinding efficiency, and achieves the goal of high output and low energy.

Cement kiln is used to make cement clinker, and it is the core equipment of cement production line; usually, apply for dry method cement production. There are two main kinds of cement kiln to manufacture cement clinker. One is the cement rotary kiln, and it is horizontal and can rotate. Rotary kiln is widely applied to the cement clinker production. Another one is vertical and fixed kiln, so it is called as a vertical kiln.

AGICO Cement can manufacture cement rotary kiln with advantages of convenient and reliable operation, stable thermal regulation, and high operation rate. Compared to other rotary kilns on the market, our rotary kiln increase operation rate by 10%, production capacity by 5%-10%, widely apply for cement production line of different countries.

Clinker cooler and dryer are two necessary parts of cement clinker production. The dryer produced by AGICO can apply for various raw materials and easy to adjust. During the operation, the dryer supplies heat stably, ensures the drying quality and cement quality. The cement cooler is also used for clinker production. Using blower blowing cold air, quench the cement clinker that laid on the grate plate, decrease the temperature of clinker from 1200 to 100 and below, the cooling exhaust gas enters into the kiln as secondary air.

In fact, every cement plant requires different cement equipment. Except for the cement equipment we mentioned above, there are many other cement making machines applied for the cement plant. In the real application, as a professional EPC cement plant project provider, AGICO Cement always provides a solution according to clients needs, such as mini cement plant, VSK cement plant. We also provide single cement equipment with high quality and competitive price, welcome to contact!

cement-grinding-plant

cement-grinding-plant

Description The cement grinding station with an annual output of 1 million tons adopts the technology of separately grinding clinker and slag, among which the clinker grinding adopts the combined grinding process composed of two 4.2m 13m cement mills. The production process of the grinding station is stable, achieving the goal of high quality, high yield and low consumption.

This 500,000t/y cement grinding station is constructed in Russia. Jiangsu Pengfei Groupundertakes the construction of this cement grinding line from Star River Industrial Development Co., Ltd. which is in the Economic Cooperation Zone of Heihe City in Heilongjiang Province. Pengfei is responsible for the process design of the whole project.

This 2,000,000 t/y cement grinding station or cement grinding machine could serve concrete mixing plants and concrete pipe pile factories. It could also be used in industrial construction project and civil construction project. Jiangsu Pengfei Group provides complete project plan and process equipment. It is an independent and complete cement production line including cement grinding, bulk packaging, and packaging and delivering.

Pengfei Group provides the complete project plan of this 1000000 tons/year slag powder production line. We also manufacture process equipment of this production line. We adopt a close circuit grinding system consist of 1400450 roller press, 3.813m ball mill, and 0-SEPA3000 separator. We set six1018m powder storage silos for this slag powder processing equipment. The total storage capacity is 6000 tons. We have four 220 m3/min oil-free lubricating air compressors to provide compressed air. Compressed air is dried and purified by dryer and water oil separator.

modular and portable grinding station plug and grind classic cemengal: engineering, equipment and assembly for the cement industry. experts in grinding station

modular and portable grinding station plug and grind classic cemengal: engineering, equipment and assembly for the cement industry. experts in grinding station

The P&G number #1 container bin farm includes 4 bins with its dedicated weightfeeders. This allows you to use clinker, gypsum and two other additions (fly ash, slag, limestone or puzzolan). If one or no additions are required you will have 2 or 3 bins of clinker for extra storage capacity.

The container number #2 has a 450kW ball mill of extreme simplicity to ensure maximum reliability and low maintenance. Nevertheless todays most advanced technology has been used in its conception and construction. This ball mill is ready to be installed as it comes on a flat-rack container.

The container number #4 has a horizontal silo with a total storage capacity of 30Tm. The filters special design allows using the hopper as a cement silo. Cement is reclaimed by 3 screw conveyors which carry it to a one spout packing machine and/or the optional bulk-loading silo.

The container number #6 has the electrical and control room that includes all the necessary equipment to run the plant. An extremely simple control panel helps the operator avoid making mistake during operation.

The P&G number #1 container bin farm includes 4 bins with its dedicated weightfeeders. This allows you to use clinker, gypsum and two other additions (fly ash, slag, limestone or puzzolan). If one or no additions are required you will have 2 or 3 bins of clinker for extra storage capacity.

The container number #2 has a 450kW ball mill of extreme simplicity to ensure maximum reliability and low maintenance. Nevertheless todays most advanced technology has been used in its conception and construction. This ball mill is ready to be installed as it comes on a flat-rack container.

The container number #4 has a horizontal silo with a total storage capacity of 30Tm. The filters special design allows using the hopper as a cement silo. Cement is reclaimed by 3 screw conveyors which carry it to a one spout packing machine and/or the optional bulk-loading silo.

The container number #6 has the electrical and control room that includes all the necessary equipment to run the plant. An extremely simple control panel helps the operator avoid making mistake during operation.

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cement roller press, roller press in cement plant | agico cement

cement roller press, roller press in cement plant | agico cement

The cement roller press is a kind of cement equipment for brittle materials, apply for cement clinker, and cement raw material, gypsum, coal, quartz sand, iron ore, blast furnace slag, and other materials.

The cement roller press is generally applied to the cement grinding plant, according to the real working process, cement roller press works with cement ball mill or vertical cement mill, which helps cement grinding plant to works well.

As new-type and energy-efficient cement grinding machine, cement roller press has advantages of energy-saving, high efficiency, less steel consumption and less noise. Both apply for new cement plant building and old cement plant revamping. According to the data, roller press helps ball mill system to increase the output by 30-50%. The 0.08mm fine material in the extruded material cake accounts for 20-35%, and smaller than 2mm accounts for 65-85%.

install the roller press in the cement grinding plant, the high pressure load is transmitted to the layer of the grinded material through the diameter of the double roller, most of the energy is used for the mutual extrusion between the materials. The sound energy and thermal energy generated by the friction of the material are transformed into the deformation energy of the material, which causes deformation, tearing and pulverization and fully utilize the potential of the cement grinding equipment, increase the output by 50-100%, and reduce the total energy consumption by 20%-30%. Promote the production efficiency of the entire system.

The material after grinding is greatly reduced in both particle size and the Bond function index, thereby greatly improving the grinding condition of grinding machine, and the power consumption of the entire cement grinding system is significantly reduced. It can save25-50% energy compared to traditional grinding methods, and the annual electricity saving are considerable.

Compared with the tube mill, the roller press is simple in structure, small in size, light in weight, and takes up less space in the workshop. It can save civil construction investment and also facilitate the original investment. In addition, the operation and maintenance of the roller press is very simple.

The material is squeezed and smashed continuously in the roller cover, and the harmful dust is not easy to spread. At the same time, the noise of the roller press is much smaller than that of the tube mill because of no impact.

The traditional tube mill is limited by processing, transportation, heat treatment and other conditions, and the large-scale tube mill is greatly restricted. The roller press grinding system solves such problems well.

The roller press works according to the principle of high-pressure layer pulverization, and adopts the work mode of single-grain pulverization. The brittle material is subjected to high pressure extrusion (the pressure of the machine in the pressure zone is about 150 MPa), the particle size of the material is rapidly reduced, the fine powder content of less than 0.08 mm reaches 20-30%, and the material of less than 2 mm reaches 70% or more, and a large number of cracks are present in all extruded materials, so that the energy required for the material to be ground in the next process is greatly reduced.

The main body of the roller press is two rollers that rotate in opposite directions, one is a fixed roller and the other is a movable roller. The brittle material is fed into the weighing chamber with the load cell by the conveying device, and then passes through the feeding device of the roller press into two rolls of the same size and opposite to each other, and the material is pulled into the nip by one side of the roller. The material is pressed into a dense material cake with high pressure, and finally falls from the nip, and is discharged from the hopper by the conveying device. The cake is further dispersed or ground by the next process.

Both the cementball mill and the cement roller press have their own advantages and disadvantages, but in actual production, the cement roller press has the advantages that the ball mill does not have, mainly reflected in the following points.

Note: Due to the large force of the roller of the roller press, the roller press has some problems, such as the material and the wear of the roller surface, the bearing is easily damaged, and the gear of the reducer is prematurely broken. In addition, the process operation process is strict. For example, the feed material column is required to be dense and full, and a certain feed pressure is maintained. The feed amount control should be appropriate, and the grinding process system configuration should be appropriate, otherwise its superiority cannot be exerted.

cement ball mill - cement grinding machine - cement mill | agico

cement ball mill - cement grinding machine - cement mill | agico

The cement ball mill is a kind of cement grinding mill. It is mainly used for grinding the clinker and raw materials of the cement plant, and also for grinding various ores in metallurgical, chemical and electric power enterprises. It has the characteristics of strong adaptability to materials, continuous production, large crushing ratio and easy to adjust the fineness of grinding products. The cement ball mill can be used not only in dry method cement production line but also in wet method cement production line. In addition, it can realize the simultaneous grinding and drying, which is the important equipment for cement grinding. AGICO is one of the leading cement ball mill manufacturers in China. We supply the high quality equipment. If you are interested, please feel free to contact us.

The materials are uniformly fed into the first chamber of the mill by the feeding device through the feeding hollow shaft. There is a stepped or corrugated liner plate and some steel balls of different specifications in the chamber. The cylinder rotates approximately once every couple of seconds, and the centrifugal force produced when the cylinder rotates brings the steel ball to a certain height and then falls down. This kind of impact force will have a grinding effect on the material. After the kibbling in the first chamber, the materials will enter the second chamber through the monolayer partition board, which is inlaid with a flat liner plate and contains steel balls to further grind the materials. After that, the powder will be discharged through the discharge device.

AGICO Group is an integrative enterprise group. It is a Chinese company that specialized in manufacturing and exporting cement plants and cement equipment, providing the turnkey project from project design, equipment installation and equipment commissioning to equipment maintenance.

grinding plant - fives in cement | minerals

grinding plant - fives in cement | minerals

When combined into a closed circuit with the FCB TSV third generation air classifier, the FCB grinding equipment enhance drastically the plant performances, even for modernization or up-grading projects.

Material drying is achieved with Pillard HeatGen Systems, delivering the necessary hot gases to the grinding plant, capable of firing liquid, gaseous or pulverized solid fuels such as coal and pet-coke.

grinding mill - cement industry news from global cement

grinding mill - cement industry news from global cement

Philippines: Germany-based Gebr. Pfeiffer says a ready2grind system it supplied to Petra Cement started in early December 2019. The clinker grinding mill is operational at a grinding plant on the Zamboanga Peninsula in Mindanao. No value for the order has been disclosed. Petra Cements sister company , Big Boss Cement, has also ordered a modular mill system from Gebr. Pfeiffer.

Philippines: Gebr. Pfeiffer has received an order for a modular four-roller ready2grind 2500 vertical grinding unit to Big Boss Cements Porac, Pampanga plant. It says that the mill will have a production capacity of 70t/hr of cement, ground to a fineness of 4000cm2/g. The company will additionally supply a packing plant module for bag and bulk loading.

Gebr. Pfeiffer said that in spite of delays to the units commissioning due to coronavirus lockdown, it has experienced specialists on site and is therefore able to support the customer in this phase.

Thailand: Germany-based KHD Humboldt Wedag has reported the successful commissioning of a new Comflex grinding line at Siam City Cements Plant 1 in Saraburi. The line replaces two ball mill circuits, maintaining a production capacity of 350t/hr with a 40% lower energy consumption. The Comflex comprises a roller press, RPM18200/180 static coarse material separator, VS620 static fine material separator, LS8600 system fan, HKSK 236/346 and four product separation cyclones. KHD says that Siam City Cement awarded it the engineering, procurement and construction (EPC) contract because of the systems low specific power consumption of 13.36kWh/t, compared to over 21kWh/t in the previous system.

Germany: Gebr. Pfeiffer has launched a range of webinars and individual analysis and advice sessions in order to support cement producers preparing for start-up after the global coronavirus crisis. The services include webinars about vertical roller mill grinding and the Gebr. Pfeiffer MVR roller mill range and ready2grind modular system, as well as individual remote inspections. Gebr. Pfeiffer is also offering individual start-up support sessions.

Uzbekistan: Eurocement subsidiary Akhangarantsement has reported the successful installation of rotary kiln housing at its upcoming 3.0Mt/yr integrated Akhangarantsement plant. The Uzbekistan Daily newspaper has reported that workers completed internal and external welding on the kiln body, while work on jaw and hammer crushers for the raw materials and clinker grinding plants is ongoing. The project is on schedule for completion in mid-2020.

Togo: Cim Metal Group subsidiary Cimco has received a Gebr. Pfeiffer 6400kW, CEM I - CEM IV MVR 6000 C-6 grinding mill. Germany-based Intercem Engineering will install the mill, which grinds CEM-I to a fineness of 3800cm2 at a rate of 370t/hr, at Cimcos Lom grinding plant.

India: JK Cement has announced a rise in total comprehensive profit (net of tax) over the nine months ended 31 December 2019 of 130% to US$56.2m from US$24.5m in the corresponding period of 2018. Revenues rose by 14% year-on-year to US$567m in the period from US$495m over the nine months to 31 December 2018.

Interesting news from Holcim Mexico this week with the announcement that it is planning to invest US$40m towards building a 0.7Mt/yr grinding plant in the state of Yuctan. The unit will be supplied with clinker from Holcim Mexicos Macuspana and Orizaba integrated cement plants. This follows the news in August 2018 that Elementias cement company, Cementos Fortaleza, had started to build a new 0.25Mt/yr grinding plant at Merida in Yucatan. That project has a budget of US$30m.

These two projects offer a contrast to comments made by the head of Cemex Mexico, Ricardo Naya Barba, who was lamenting the state of the market to local press at the start of the month. He said that sales volumes of cement, concrete and aggregates had fallen by 12 15% in the first seven months of 2019. He blamed the decline partly on falling national infrastructure investment. This marked a slight improvement on Cemexs Mexican results for the first of 2019 where sales, sales volumes and earnings were all down. At this time as well as slowing infrastructure projects the situation was also attributed to a residential sector hit by the slower-than anticipated start of the new programs.

Elementias Mexican cement business, Cementos Fortaleza, reported a similar picture in the second quarter of 2019. Its net sales fell by 6% year-on-year to US65.4m from US$69.7m. This was attributed to a market contraction affecting all of Elementias businesses in the country, as well as the redefinition of its core products for the Building Systems business unit. Earnings fell also and this was further attributed to mounting energy and freight costs. Cementos Moctezuma faced many of the same issues. Its cement sales fell by 13% to US$147m in the second quarter of 2019. It is expecting a similar picture for the remainder of the year.

Data from the National Institute of Statistics and Geography (INEGI) shows that the value of cement sales in Mexico fell by 7% year-on-year to US$1.21bn in the first quarter of 2019 from US$1.30bn in the same period in 2018. Cement sales volumes fell by 8.2% to 10.9Mt from 11.9Mt. This was the lowest figure since 2014.

The one larger Mexican cement producer that doesnt seem to have been overly troubled so far in 2019 is Grupo Cementos de Chihuahua (GCC). Earlier in the year the company was considered to be the Mexican cement producer most at risk from potential US tariffs due to higher reliance on exports than its competitors. Yet Mexicos National Chamber of Cement (CANACEM) publicly said that that it didnt consider US tariffs a significant barrier to the local industry. GCC reported growing net sales and cement sales volumes in the second quarter of 2019 due to industrial warehouse construction, mining projects and middle-income housing at the northern cities.

Two new grinding plants in a particular region of Mexico dont necessarily reflect the state of the countrys industry as a whole. Yucatan may suit the grinding model due to a lack of raw materials or strong shipping links. The region may also be defying the gloomy national state of affairs in the construction sector. Alternatively, producers may be chasing low-cost and low-risk expansion plans in a tough market. The grinding model wins out over the clinker producing one in this scenario. In the wider picture in August 2019 Cemento Cruz Azul ordered two petcoke grinding mills from Germanys Loesche and Austrias Unitherm Cemcon said it had been awarded the supply of an MAS DT burner to an unnamed cement plant. These suggest that, although the sector may be having a bad year so far, things are expected to get better.

Philippines: Republic Cement Services plans to commission two cement grinding mills in 2019 at a cost of US$20m each. Once completed the company will have a cement production capacity of around 9Mt/yr, according to GMA News. President Nabil Francis also said that the company would need more clinker for the mills. This could either be sourced locally or from imports.

Sweden: Cementas Skvde plant working on project to optimise its grinding process and reduce the clinker factor of the cement it produces. The project is looked at grinding limestone separately as opposed to grinding it with clinker and gypsum, which it currently does. The plant is using a mill it only uses occasionally to grind the limestone to the desired size. A full-scale trial was run in the autumn of 2018. Products from the trial are now being tested at a laboratory.

ball mill & roller press systems for cement grinding process | agico

ball mill & roller press systems for cement grinding process | agico

The grinding process consumes the most energy in the cement production, its energy consumption accounts for more than 70% of the total power consumption in the whole process of cement production. There are three main grinding processes in the cement production: raw meal grinding, cement grinding, and raw coal grinding. The power consumption of the cement grinding accounts for about 40% of the total power consumption of the cement production process. Therefore, the selection of a reasonable cement grinding system plays a key role in energy saving and consumption reduction of cement plants.

Nowadays, the cement grinding system has developed from the previous single ball mill system to ball mill + roller press system and vertical roller mill system. Today we will introduce three mainstream ball mill + roller press cement grinding processes that are often adopted in cement plants and cement grinding stations.

The cement grinding process in this system is rather simple with less equipment required. The finished product cement from this system has all been further ground in the ball mill, so it has wide particle size distribution and stable performance.

However, due to the fact that the materials rolled by the roller press are not sorted, a large amount of fine powder is returned to the roller press. If the return proportion is more than 60%, the roller press will not be able to operate stably, so the power saving range of the roller press is limited.

In this system, the ground materials from the roller press is first processed by the separator and divided into two parts: the coarse part and the fine part. The fine part is sent to the ball mill and ground to product cement, the coarse part is returned to the roller press to be ground again. The finished product cement from this system also has wide particle size distribution and stable performance.

But this system also has its weakness. The cyclone and the circulating fan in this system are easily worn, and there are a lot of qualified fine powers in the semi-finished products, which lowers the grinding efficiency of this system.

The two stage grinding system is developed from the combined grinding system of roller press and ball mill. This system performs even better on energy saving, and also solves the worn problem of the cyclone and the circulating fan.

In this system, the pressed materials from the roller press are divided into three parts by the separator: the coarse part, the fine part, and the medium-fine part. The coarse part is returned to the roller press for crushing once again; the medium fine part is sent to the ball mill for final grinding; and the fine part is discharged directly as the finished product cement.

Because the roller press and the ball mill are two separate circulate system, the whole cement grinding process is easy to operate and control. The grinding efficiency of the system is also enhanced because qualified fine powers from the roller press dont need to be ground again by the ball mill.

However, due to the fact that part of the finished cement produced by this system has not been ground by the ball mill, its particle uniformity and working performance may be slightly worse than those produced by the other two systems.

The three cement grinding systems are all formed mainly by a roller press and a cement ball mill, and each of them has its own advantages and disadvantages. The selection of the three systems mainly depends on the relative size of the roller press and the ball mill

As a professional contractor of cement plant, in the design process of cement plant, our team will select the most appropriate cement grinding system after fully considering the production condition and discussing with the client.

If you still have questions about the cement grinding system, or are interested in something else related to the cement plant process, please feel free to use the contact form below and get in touch! We will respond as soon as possible!

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