rotary kiln for sale - sale rotary kiln by qualified manufactures
Rotary kiln refers to rotary calcination kiln (commonly known as rotary kiln) and belongs to the category of building materials equipment. Rotary kilns can be divided into cement kilns, metallurgical chemical kilns, and lime kilns according to different materials processed. Cement kilns are mainly used for calcining cement clinker, which divided into two categories: dry process cement kilns and wet process cement kilns. Metallurgical and chemical kilns are mainly used for magnetizing roasting of iron ore-depleted ore in iron and steel plants in the metallurgical industry; oxidizing roasting of chromium and nickel-iron ore; refractory plant roasting high alumina vanadium ore and aluminum plant roasting clinker and aluminum hydroxide; And chrome ore powder and other minerals. Limekiln (ie active lime kiln) is used for roasting active lime and light-burning dolomite used in iron and steel plants and ferroalloy plants.
Cement rotary kiln belongs to the category of building materials and equipment, it is a kind of lime kiln. 0.5mm tolerance cement rotary kiln means that the allowable error of rotary kiln shell is within plus or minus 0.5mm.
Lime rotary kiln is also called roller rotary kiln. To make sure its air leakage coefficient is less than 10 percent, lime rotary kiln adopts advanced structure and reliable combined scale-like seal in both ends. It also uses composite refractory to reduce the loss of heat radiation.
Shaft kiln, just as its name implies, is a kiln with erected shape. Shaft kiln with modern new technology has environmental protection function, energy-saving function, high mechanization, and high automaticity. It also has the ability to turn waste into wealth.
The rank of countries alumina bauxite storage is Australia, The Republic of Guinea, Jamaica, China, and India. Rich reserves provinces in China are Shanxi, Guizhou, Guangxi, and Henan province. Generally, alumina bauxite is used to produce alumina or aluminum.
The data survey found that the price of AGICO groups rotary kiln will be about 600-1000 cheaper than the prices offered by the merchants in other cities. The reasons for the analysis are as follows:
It is the main body of the rotary kiln (rotary kiln), usually 30 to 150 meters long, cylindrical, with 3 to 5 rolling circles in the middle. Most of the barrels are processed into 3-10 sections by the factory, and then welded by large trucks to the destination.
On the contrary, the cooler and the preheater are devices that rapidly reduce the temperature of the rotary kiln after firing. It looks like a small rotary kiln, but the diameter is smaller and shorter.
It is also called preheater, which is a device for preliminary heating of materials by the waste heat of exhaust gas discharged from the rotary kiln before the materials enter the rotary kiln. Most of them are vertical structures.
cement rotary kiln - rotary kiln - rotary kiln manufacturers | agico
Cement rotary kilns refer to cement rotary calcining kilns (sometimes called rotary furnaces). It is a pyroprocessing device used to heat materials to high temperatures in a continuous process. The kiln body is a cylinder vessel with a certain degree of tilt to the horizontal level. Raw materials are fed into the vessel from the upper end and moved to the lower end, being stirred and mixed relying on the inclination and rotation of the kiln. The kiln burner produces a lot of heat by burning fuel. This kind of heat is usually transferred to materials through flame radiation, hot gas convection, kiln brick conduction, etc., which causes the chemical reaction between raw materials and finally forms clinker.
Rotary kilns can be divided into cement kiln, metallurgical and chemical rotary kiln, lime rotary kiln and so on. Cement rotary kilns are used for calcining cement clinker in the cement plant, which can be divided into dry cement kiln and wet cement kiln. Metallurgical and chemical rotary kilns are mainly applied in the metallurgical industry. As for the lime rotary kiln, it is the main equipment for calcining active lime and light burned dolomite used in iron and steel plants, ferroalloy plants, calcium carbide plants, and magnesium metal plants.
The cement rotary kiln is mainly composed of cylinder, supporting device, drive gear, refractory lining, catch-wheel device, kiln head sealing device, kiln tail sealing device, kiln hood, and other components. On the cylinder, there is a large gear ring fixed with a spring plate near the kiln tail, some pinions below are engaged with it, jointly forming the drive gear. In normal operation, the main drive motor will transfer power to this gear device through reducer to run rotary kiln. The raw material usually enters the rotary kiln from the upper end and move slowly to another end along with the chamber as it rotates. In this process, raw materials will be heated by high temperature and then decompose and produce chemical reactions so that their state finally changed. Under normal conditions, the heat source of indirect fired rotary kilns is supplied from the kiln burner outside the kiln. This kind of way protects the integrity of raw materials, while the heat source of the direct-fired rotary kiln is inside the kiln. Besides, the rotation speed and temperature of the cylinder are tightly controlled and changed according to different desire processes and material applications. After the calcination is completed, the clinker will be pre-cooled in the chamber and then be sent into the cooler for further cooling.
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.
china lime plant rotary kiln, lime plant rotary kiln manufacturers, suppliers, price
China manufacturing industries are full of strong and consistent exporters. We are here to bring together China factories that supply manufacturing systems and machinery that are used by processing industries including but not limited to: cement plant, rotary kiln, kiln. Here we are going to show you some of the process equipments for sale that featured by our reliable suppliers and manufacturers, such as Lime Plant Rotary Kiln. We will do everything we can just to keep every buyer updated with this highly competitive industry & factory and its latest trends. Whether you are for group or individual sourcing, we will provide you with the latest technology and the comprehensive data of Chinese suppliers like Lime Plant Rotary Kiln factory list to enhance your sourcing performance in the business line of manufacturing & processing machinery.
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We always stick to the principle "Quality First, Prestige Supreme". We are fully committed to providing our clients with competitively priced quality products, prompt delivery and professional service for Lime Plant Rotary Kiln, Lime Burning, Lime Production Line, China Professional Manufacturer Vertical Shaft Lime Kiln, We warmly welcome customers, business associations and friends from all over the world to contact us and seek cooperation for mutual benefits. The purchaser fulfillment is our primary focus on. We uphold a consistent level of professionalism, high quality, credibility and service for Lime Plant Rotary Kiln, Insisting on the high quality generation line management and customers expert assistance, we now have designed our resolution to supply our buyers using the to start with amount getting and just after services practical experience. Maintaining the prevailing friendly relations with our buyers, we however innovate our solution lists all of the time to satisfy the brand new demands and adhere to the most up-to-date development of the market in Malta. We have been ready to face the worries and make the improve to understand all the possibilities in international trade.
rotary lime kiln operation
Precipitated calcium carbonate, commonly called lime sludge or lime mud, is produced when sulphate green liquor is causticized with lime. For many years this lime sludge was considered a waste product and was dumped into rivers or waste ponds, or used for fill around the plants. Large quantities of new lime were purchased from commercial producers to replace that lost in the sludge waste.
A number of paper manufacturers soon became aware of the savings that could be achieved by recovering the lime. Beginning in the 20s, efforts were directed toward lime recovery installations. Today, a proper Rotary Lime Kiln Operation isan integral part of all modern pulp mills.
High quality lime can be produced at a uniform rate only if the kiln is fed at a constant rate with lime sludge of constant composition. In some cases the feed to the kiln consists of a pumpable sludge containing 55 to 65% water. However, in most installations a drum filter or a centrifuge is installed just ahead of the kiln to reduce the moisture content to 35 to 50%. This cake is fed to the kiln through a screw conveyor, which is water-jacketed for that portion extending into the kiln feed end connection.
A ferris wheel slurry feeder and a surge tank located ahead of the filter or centrifuge will insure a constant rate of feed to the kiln. The surge tank should be provided with efficient means of agitation and dilution control to maintain uniform consistency of the feed to the ferris wheel slurry feeder. The overflow from the feeder is returned to the surge tank. The surge tank should have a capacity of 1 to 2 hours kiln feed.
Calcium carbonate begins to dissociate in the kiln at a temperature of about 1500 F. Theoretically, lime sludge could be heated to this temperature and held there until dissociation was complete. However, this dissociation process is accelerated at elevated temperatures. Therefore, to facilitate complete dissociation of various sized pellets with a reasonable retention time, temperatures in excess of 1500 F are necessary. The lime is usually discharged from the kiln at approximately 2200 F, although this will vary somewhat with the size of the kiln and the capacity at which it is operated.
To improve the thermal efficiency of the kiln, a chain system is installed in the feed end. The chains pick up the lime sludge and expose it to the hot gases. The chains also absorb heat from the hot gases, transferring this heat when they again dip into the wet material.
The gases enter the chain system at a temperature of 1200 to 1400 F and leave at approximately 300 to 550 F. In general, the lime sludge leaving the chain system should have a moisture content of 10 to 15%. If the moisture content is permitted to go below this figure, the sludge will no longer protect the chains, with the result that they will be oxidized and disintegrated by the hot gases.
Such samples will also provide the operator with a visual check on whether satisfactory pellets are being produced. To minimize dusting, the lime should travel through the kiln in the form of pellets about inch in diameter. Larger pellets are undesirable since they will be overburned on the outside. The natural rolling action of the sludge on the kiln wall will form good pellets, provided the kiln is fed at a uniform rate with sludge of constant composition.
Excessive impurities, particularly soda, will promote the formation of large balls as well as rings. Experience indicates that the soda content should be maintained below 1% reported as Na2O on a dry basis. Impurities must be controlled by proper liquor clarification, washing and filtering.
Some mills with lime recovery kilns are troubled by ring formation. So many factors influence the ringing characteristics in a given installation that it is difficult to make any definite statements regarding ring control. Varying amounts of moisture, soda, free calcium oxide, iron, alumina and silica will affect ring formation. Increasing the feed rate beyond the normal capacity of the kiln will increase the tendency to ring. In some cases a change in the moisture content has greatly reduced the formation of rings.
The tendency to ring formation is more pronounced in a small diameter kiln than in a large diameter kiln. This is due to the greater arch effect in a small kiln. The smaller arch effect in a large diameter kiln will permit agglomerating material to fall away more readily, thus minimizing ring formation. Sometimes a change in kiln speed or a change in burning conditions will overcome ringing.
The uniformity of the kiln product, as well as kiln operation as a whole, depends first on controlled feed and second on proper combustion control. Good control of both feed and combustion will establish and maintain a definite temperature gradient throughout the length of the kiln. Any fluctuations in combustion or kiln feed will cause corresponding changes in this temperature gradient, with the result that the lime will not be uniformly calcined.
A constant draft at the firing hood is necessary for good combustion control. An automatic draft controller should be installed. This controller will regulate a damper in the exhaust system to maintain a constant draft at the firing hood. The usual draft at the firing hood will range to 0.05 in. water column.
The fuel should be burned with about 5 to 10% excess air to insure complete combustion. Too much air, as well as too little air, wastes fuel. Periodic Orsat analysis of the exhaust gases should be made to determine whether the correct draft is being maintained at the firing hood for proper combustion conditions.
To properly record, interpret and control the kiln performance, there should be available to the operator a record of the exhaust gas temperature, the burning zone temperature, the rate of fuel flow, and the draft at the feed end of the kiln as well as at the firing hood. All of these instruments, together with the necessary gauges, ammeters, voltmeters, and motor starter pushbuttons, should be mounted on a control panel located on the burning floor.
The chain system in a lime sludge kiln is an excellent dust arrester. However, a small amount of dust will be carried out with the exhaust gases, making a dust collecting system desirable. Returning the collected dust to the system will reduce the amount of make-up lime required.
The form in which the collected dust can be handled most conveniently in a particular mill must be decided before selecting the dust collecting equipment. Dust can be collected dry in a simple cyclone or in a commercially manufactured collector, pugged with water and flushed to waste or returned to the system. Pugging is necessary to permit ready transportation and return to the system. Sometimes difficulty is encountered in pugging this fine dust with water. A wet type collector will collect the dust in a form immediately convenient for further use.
CAUTION: Brick lining must be thoroughly dried before kiln is started up for the first time and immediately after extensive lining repairs have been made. Failure to do so may result in disintegration of the lining when kiln is brought to operating temperature.
The exhaust gas temperature in chain equipped kilns ranges from 300 to 550 F, depending on the particular installation. A few days operation will indicate the average temperature for normal operation. Watch the recorder. Any unusual temperature rise may indicate that the kiln feed has stopped. The temperature will change with changes in kiln speed or moisture content of feed.
Use only enough draft to provide air for combustion and to prevent smoke from showing up at the stack. Too much draft chills discharge end and also wastes fuel. The kiln exhaust gas should be checked frequently with an Orsat gas analyzer. The oxygen content should be held to 1.5% or less, under which conditions there should be no combustibles in the exhaust gas.
The moisture content of the sludge to the filter or centrifuge should be maintained constant with a consistency regulator. It is also important to maintain the percent of impurities in the sludge at a constant value.
The ferris wheel slurry feeder is driven by a four-speed motor which is electrically interlocked with the four-speed kiln drive motor to insure a constant rate of feed per kiln revolution. In addition, there is a speed changer which enables the operator to determine the optimum feed rate to the kiln for a given kiln speed.
Steps should be taken in the initial installation to provide a way of determining the rate of solids to kiln. A calibrating tank following the ferris wheel slurry feeder will enable the operator to make periodic checks on the rate of slurry to the filter or centrifuge. If the moisture content of the slurry is known, the rate of solids to the kiln can be readily determined. The rate of solids to the filter must be maintained constant at all times.
While the slurry feeder will insure a constant volume of sludge to the kiln per kiln revolution, it is possible for the rate of solids to the kiln to vary unless the composition of the sludge is maintained constant as pointed out under Sludge Composition, above.
Hourly samples of sludge should be taken from the sample holes located just after the chain system. These samples should be analyzed by the laboratory for moisture, soda and free lime, and the results should be listed on the kiln data sheet. This information is necessary for a proper study of kiln performance.
Hourly samples of lime should be taken from the discharge end of the kiln for determination of available lime (CaO). Good kiln operation should result in a product with an available lime content of 90%.
A ruled form should be printed for the purpose of recording pertinent data in connection with the lime burning operation. The report forms most commonly used provide spaces designated Shift 1, Shift 2, and Shift 3 for the signatures of the three men in charge of these shifts so that the responsibility for irregularities on any shift can easily be placed.
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Features The output of the rotary kiln is stable and suitable for large, medium and small active lime production lines. 1.The rotary kiln is open-type calcination. 2.The rotary kiln can directly calcine 10~50mm fine-grained limestone.
In calcination process, lime is cooked/calcined at 800c in a kiln.We are providing shafts kilns and rotary kilns for calcining of limestone/lime sludge with multi fuel options. Prior to calcination, exhaust gases of kiln preheat lime. And after coming out of calcination area, quicklime is cooled by direct contact with cooling air.
Lime processing plant is often equipped with either rotary lime kiln or vertical lime kiln. For lime kiln is the core equipment of the plant to produce burnt lime. Of course, except lime kiln, there are also other machines in the lime calcination plant.
We cater for Hydrated Lime Plants, Quick Lime Plants, and Precipitated Calcium Carbonate Plant among the lime plants technology. We provide lime plants including lime processing plant and lime processing machinery that incorporate the latest technologies to ensure effective and reliable operation at maximum production.
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Large 1,000+ ton/day capacity Vertical Lime Kilns are possible, are very energy efficient and easy to operate. Minimal maintenance is required, because the limestone is brought to the top and into the kiln. Then the limestone is burned (calcined) for a specified time of hours to produce powdered lime.
As a kind of rotary kiln, the lime kiln, also called active lime rotary kiln, is the main equipment used to calcine active lime, consisting of the drum body, the supporting device, the supporting device with hydraulic retaining wheel, the device, the device, the device for kiln tail.
daswell lime kiln manufacturer - rotary lime kiln and vertical lime kiln
Lime kiln is also known as quicklime kiln or limestone kiln. And according to shapes and operation principles, there are rotary lime kilns and vertical lime kilns. Quicklime kiln is the core equipment of quicklime plant to burn limestone to produce quicklime or burnt lime. Lime kiln has been used for this application for long time. However, lack of high technology as well as quality materials, the traditional lime kilns often consumes lot of energy in the lime manufacturing process. With the development of high technology and quality materials, modern limestone kilns are more cost efficient than the traditional ones. As a professional lime kilns manufacturer, Daswell machinery provides high quality lime kilns, whether the rotary lime kiln or the vertical kiln, producing high capacity of uniform quicklime with low energy consumption.
Henan Daswell machinery company is a leading lime kiln manufacturer in China. We provide customized rotary lime kilns and vertical lime kilns according to your needs. With constant development and innovation, Daswell lime kilns are of robust designs with quality materials, so that they can be durable and reliable equipment for your quicklime plant. Besides, as a professional lime kiln manufacturer, Daswell always puts cost efficiency of lime production plant first and the lime kilns of Daswell are designed to be cost efficient, producing high capacity of quicklime with low energy consumption. So every part of Daswell lime kiln is carefully considered, such as the refractory lines in the lime kiln, preheater and cooler for rotary lime kiln, fuels and so on. And the sizes of lime kilns are designed according to customers needs in production capacity. In fact, except for providing high quality lime kilns, Daswell machinery offers tailored solutions for quicklime plant, including previous designing and planning in line with customers needs.
The working principles of limestone kilns are the same for rotary lime kiln and vertical lime kiln. It is well known that limestone contains mainly calcium carbonate. And when calcium carbonate is heated at proper high temperatures, usually above 1000 degrees, the decomposition of calcium carbonate will produce quicklime and carbon dioxide. And the burnt lime is the end product.
For the modern rotary lime kiln with preheater and cooler, the sifted limestone will first go to the preheater. In the preheater, the hot air from the rotary lime kiln will preheat the limestone to about 800 degrees, which as a result saves lot of energy as well as money. Then the limestone will be transferred to the rotary lime kiln. After the constant rotating of rotary lime kiln for required time, the thoroughly burnt lime will be transported to the cooler. From there, the hot quicklime will be cooled down so that they can be packed.
As for the vertical lime kiln, it contains three parts from up to down: preheating, calcining and cooling. When the limestone is feed from the top of vertical lime kiln, the limestone will go through these three parts and become burnt lime. Finally, the quicklime will be discharged from the low end of the vertical lime kiln.
The differences of rotary lime kiln and vertical lime kiln lie in that they are different in shapes and constructions. The rotary lime kiln is slightly inclined to horizontal and rotates on a set of riding rings. Traditionally, in order to burn down the limestone thoroughly, rotary lime kiln is often very long. However, modern rotary lime kiln tends to be shorter and is equipped with pre-heater and cooler to save energy as well enhance quicklime plant efficiency. For the vertical shaft lime kiln, as the name implies, is vertical. And all the processes can be done in the vertical lime kiln alone. As for capacity, rotary lime kiln can produce quicklime with larger capacity than vertical lime kiln. Daswell rotary lime kiln can produce quicklime 150-1200 ton/day, while the capacity of vertical lime kiln is 100-500 ton/day.
As stated above, Daswell provides both rotary lime kilns and vertical lime kilns. And all these lime kilns can be customized according to customers needs. So how can you choose a proper lime kiln? There are several factors to consider.