high quality high alumina bauxite rotary kiln bauxite clinker

rotary kiln for sale - sale rotary kiln by qualified manufactures

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.

aluminum industry refractory - rs kiln refractory bricks

aluminum industry refractory - rs kiln refractory bricks

The worlds annual aluminum output takes the top position among nonferrous metals production, far larger than other nonferrous metals. Refractory material consumption of aluminum industry is much more than the total consumption of copper, lead and zinc smelting. The production of aluminum including 2 steps, first, produces alumina from bauxite by wet method, second, uses industrial alumina as raw material, adopts molten salt electrolytic process to produce aluminum. High temperature kilns used for aluminum production are rotary kiln, molten salt electrolytic tank, aluminum smelting furnaces, etc.

Refractory material consumption of industrial aluminum smelting furnaces is large, thats because, during producing Al2O3, basic material will have very severe corrosion to alumina rotary kiln refractory material. When smelting aluminum, even the temperature is relatively low, aluminum liquid has very strong permeability, once it permeates into firebricks, it will react with SiO2 and reduces Si from the firebricks, which will destroy their structure and cause the looseness, spalling and damage of furnace lining.

So SiO2 containing refractory materials are also not suitable for the masonry of aluminum smelting equipments. High alumina bricks and carbon refractories are usually used for ordinary aluminum industry furnaces.

Rotary kiln is thermal equipment for the sintering of alumina clinker. During manufacturing alumina, alumina bauxite, pure alkali and lime are proportionally loaded into rotary kiln, calcined at 1200~1300, the calcined bauxite clinker needs to be further processed to make Al(OH)3. After sintering in 1200 rotary kiln, Al2O3 are produced by Al(OH)3.

The sintering process are: high temperature flame and the raw material reversely move in the rotary kiln. Lime and bauxite raw material pulp(contains 40% water) or Al(OH)3(contains 12%~18% water) is loaded form kiln tail. After low temperature drying and dehydration, heating and high temperature sintering, calcined clinker will be unloaded from kiln head, while high temperature gas flows from kiln head to tail. So the kiln can be divided into preheating zone and high temperature sintering zone. To avoid pulp material adhering to kiln lining during sintering and to strengthen heat exchange efficiency, chains are set between refractory material brickwork, when kiln body is in rotary motion, the chains will continuously strike raw materials and lining bricks, which will affluence the service life of kiln lining.

The rotary kiln body used for alumina production is steel board welded cylinder, inner lining is constructed by refractories. The working environment of refractory materials are harsh, so they should have these characteristics: strong alkaline corrosion resistance, can continuously work at 1200~1300 high temperature and wont damage, can resist material erosion and impaction, can resist the souring of high temperature air current.

Reractories used in rotary kiln are mainly high alumina bricks and magnesia bricks. Low temperature drying kiln usually adopts fireclay bricks as inner lining refractory. At sintering zone, there is often an insulating lining between kiln wall and firebricks inner lining, which is often built by diatomite bricks, ceramsite bricks or refractory fiber felts.

Currently, unshaped refractories are popularly used in aluminum industry. Rotary kiln inlet where constantly suffers materials high temperature abrasion and thermal shock stress, is vulnerable to deformation damage. At alumina clinker sintering kiln transition zone, the temperature is between 400~1000, alkaline corrosion and mechanical damage are severe, the inner lining often spalls or falls off. So steel fiber castable which has good abrasion resistance is are usually used in rotary kiln.

The roasting of aluminum hydroxide is the last procedure of alumina production. Its main purposes are drying adhered water and crystallization water in aluminum hydroxide and transforming some -alumina into -alumina. Most alumina manufacturer in China have totally or partly adopted fluidized roasting equipments. Fluidized roasting equipments are classified into fluidized flash roasting furnace, circulating fluidized roasting furnace and suspension roasting furnace. Refractories for these 3 types of roasting furnaces are not the same, but large quantity of unshaped refractory( plastic refractory and refractory castable) are used, more specifically, 50%~70% of refractory consumption is unshaped refractory.

Alumina gas suspension roasting furnace is the specialized equipment for aluminum hydroxide roasting. The craft and automation level are both very high, roasting process takes place at high temperature furnace body ( 1200) and high speed atmosphere. The processed alumina has high rigidity, good flowability, meanwhile, there are strict quality standard on alumina products, any mixing of impurity can directly affect the product performance. So the refractory materials used in alumina gas suspension roasting furnace should have the following characteristics: high refractoriness, good abrasion resistance, high strength, good thermal stability, good integrity, good tightness.

Aluminum reduction cell is the core equipment for the production of electrolytic aluminum. Aluminum reduction cells are usually rectangular steel shells, with carbon bricks inner linings. Carbon anode suspends in aluminum reduction cell, while carbon cathode locates at the bottom. Molten Cryolite, aluminum fluoride, lithium fluoride and so on are usually used as electrolyte. Al2O3 is smelted at 970 and electrolyzed into metal aluminum at bottom cathode and oxygen at anode, oxygen can react with carbon anode and produce CO2 or CO. The heat released by electrochemical reaction can keep aluminum and aluminum reduction cell molten state, aluminum liquid is discharged from reduction cell at intervals, and some quantity of alumina and cryolite are added into the cell. Electrolysis temperature is kept between 900~1000.

Refractory materials used in aluminum reduction cell cathode should have good electricity conductivity and good cryolite, NaF and aluminum liquid corrosion resistance. The bottom working lining of aluminum reduction cell is formerly lined by carbon block, but it can react with sodium and form new compound, the working linings structure becomes loose, mechanical strength deceases, and crack also appears in the carbon blocks. Electrolyte and aluminum liquid can permeate into carbon block through the cracks, and react with carbon to form Al4C3, which causes the further expansion of carbon block cracks, and finally leads to the severe corrosion of inner lining and the deformation of aluminum reduction cell shell. Therefore, amorphous carbon bricks are gradually replaced by semi graphitized carbon bricks or graphitized carbon bricks.

The damage reasons of aluminum reduction cell side wall inner lining are air caused material oxidization, high temperature molten cryolite, NaF and aluminum corrosion, moving molten liquid scouring and erosion, temperature fluctuation and thermal expansion caused thermal stress.

Amorphous carbon blocks and graphite carbon blocks are used to mason the side wall of aluminum reduction cell, the lethal defect of carbon based refractories is bad oxidization resistance and low mechanical strength. To prevent oxidization, and keep relatively large electric resistance, SiC refractory materials are gradually developing, among them, silicon nitride bonded silicon carbide bricks have the best application effect. The advantages of silicon nitride bonded silicon carbide bricks are: excellent high temperature mechanical performance, good thermal conductivity, easy to form condensed slay at inner side, large electric resistance, can reduce side way electricity loss, good oxidization resistance, wont react with aluminum liquid, cryolite and other molten body, can large scale reduce lining bricks thickness and increase reduction cell volume. For example, the carbon bricks lined side way thickness is about 200~400mm, while the thickness of silicon nitride bonded silicon carbide bricks lined wall is only 75mm.

During electrolytic aluminum production, Na and NaF vapor, liquid can permeate into insulating lining from bottom cathode materials. So the thermal conductivity of insulating lining will increase and correspondingly decrease aluminum reduction cell thermal efficiency, the working atmosphere will degenerate till the damage of reduction cell. A new type of dry impervious material can be paved between cathode refractory and insulating lining, it can not only prevent the permeation of electrolyte but also has good heat preservation performance.

Gas-combustion or oil-combustion fixed or tilting reverberators are usually used for aluminum ingots and scrap aluminum melting and alloying, sometimes, resistance reverberator or induction crucible furnace are also adopted.

Although the temperature of aluminum liquid and aluminum alloy is only 700~800, magnesium, silicon, manganese and other element in aluminum and aluminum alloys are very active, easy to react with some components in refractory material and cause refractory damage. The main damage mechanisms of aluminum smelting furnaces are:

Aluminum smelting reverbertator refractories should resist aluminum liquid and magnesium vapor infiltration, have excellent abrasion resistance and thermal stress impaction, etc. Furnace lining where contact with aluminum liquid usually adopts high alumina bricks containing 80%~85% of Al2O3. For high purity aluminum smelting, corundum bricks or mullite bricks are usually adopted. At furnace bed slope and scrap aluminum feeding parts, where corrosion and abrasion is frequently happened, silicon nitride bonded silicon carbide bricks are often used. At aluminum runner and aluminum tapping hole, aluminum scouring is severe, so self bonded or silicon carbide bonded silicon carbide bricks are adopted, zircon bricks are also used for the masonry of inner lining. For furnace lining, where dont contact with aluminum liquid, clay bricks, fireclay castable or plastic refractory are usually used. The inner lining of aluminum running trough usually adopts silicon carbide bricks or fused foam silica precast blocks.

With the enlargement aluminum smelting furnace and the strengthening of smelting, high strength anti-aluminum permeation castable which has excellent permeation resistance, abrasion resistance and thermal impaction resistance are widely used in aluminum smelting furnace.

Rongsheng Refractory Supplier provides kinds of refractory bricks and monolithic refractories. Exclusive customer service and refractory lining material solutions for metallurgy, nonferrous metals, building materials, electric power, petrochemical and other industries. Save production costs and improve economic efficiency.

rotary kiln for alumina is a widely used rotary kiln in calcinating sector

rotary kiln for alumina is a widely used rotary kiln in calcinating sector

Rotary kiln for alumina combines with domestic advanced technology and foreign progressive technology. Rotary kiln for alumina has a lot of advantages concluding simple operation, advanced technology, reasonable structure, stable performance, etc.

From a chemical point of view, rotary kiln for aluminas working content is a process of reasonably disposing of heterogeneous heat and mass transfer of solid and gaseous media. Those processes require both high operating technique and a lot of changing factors. So, it is more difficult in operating this process than heterogeneous heat or mass transfer process between gaseous and liquid. Alumina rotary kiln has a small inclination angle to the horizontal line. Raw materials flip up and down then move forward upon the inner wall with the rotation of kiln. Materials rotation keeps the air in the kiln contact with them to proceed with heterogeneous heat transfer and mass transfer operations.

rotary kiln clinker's factors affact the quality of kiln clinker

rotary kiln clinker's factors affact the quality of kiln clinker

Usually controlling clinker calcining temperature in 1300 ~ 1450 ~ 1300 can ensures the quality of the clinker and sintering, for the current our country quite part of the manufacturer with the combination of ingredients (high KH, high SM) high strength clinker production, its raw material is easy to burn, clinker calcining temperature should be controlled moderately high, corresponding control in 1300 ~ 1500 ~ 1300 .

For the manufacturers with double-height (high KH, high SM) clinker ingredients, it is required to control the length of the calcining belt to be longer than normal and the calcining temperature to be higher, namely high-temperature long belt calcining, which is conducive to the improvement of clinker sintering and clinker quality. Generally, it is best to control the length of the calcining belt to be around 4.5 ~ 5.5Di.

The length to diameter ratio of clinker calcining kiln has a great influence on the quality, such as Nissan 2000 tons of calcining kiln L/D now some tend to be shorter design control, in order to design more control in about 10 ~ 11 factories, so beneficial to the improvement of the clinker quality. Mainly due to the low length to diameter ratio corresponding to shorten the length of the transition zone, short kiln was beneficial to the improvement of the clinker heating rate, also shortened the calcining system into the kiln burning raw materials, low-temperature aging time, is advantageous to the clinker C2S and f CaO clinker timely dissolve in liquid phase and the formation of C3S and crystallization, favorable for formation of clinker quality.

The diameter of the kiln size also have effects on the quality of clinker calcining, it is generally believed than small diameter of large diameter kiln was beneficial to the improvement of the quality of clinker calcining, on the one hand, because the kiln using high SM in ingredients, high KH ingredients, SM control in 2.8 ~ 3.2, KH control in 0.88 ~ 0.92, and large diameter kiln head spray into a large amount of coal, the flame temperature is high, some even as high as 2000 above, still can play ingredients of clinker calcining fully, the quality is good.

Small calcining kiln, due to its length, shorter than a large kiln. Kiln low speed should be controlled well, such as 3 x 48 m, 4 x 43 m. It is advantageous to the clinker quality, mainly because the kiln length is shorter, in order to ensure that the clinker in the short kiln high-temperature residence time, the kiln speed is lower control is more favorable.

Quality clinker formation requires preheater gas-solid decomposition furnace in high thermal efficiency, heat fast, transitional zone in the stove temperature stage requires rapid heating up, the main operating requirement is to moderate increase with uncooked materials, increasing calcination kiln speed frequency, shorten the length of the transition zone, extend the calcining zone length, the promotion of clinker mineral forming and sintering, high strength high-quality clinker burning requirements quickly quench burning, kiln head grate cooler operation requirements to strengthen a room, two-room high-pressure wind volume rapidly, strengthen the cold wind of high-temperature clinker cooling effect, so beneficial to the improvement of the quality of clinker. The Influence Of Kiln Atmosphere Coal in rotary kiln burning excess air coefficient to control the general at around 1.10 ~ 1.15, the oxygen concentration in the preheater waste gas control in 2% ~ 3% for the better, that maintain a micro oxidizing atmosphere, if low excess air coefficient control, lack of secondary air, easy to cause the reducing atmosphere, innovation in reducing atmosphere, can produce CO gas, and clinker is CO reduction into FeO, Fe2O3 ingredients in clinker liquid phase composition and viscosity, influence of clinker sintering, easy to produce a large number of clinker, yellow heart also waste heat and coal consumption, so as to affect the quality of clinker.

rotary kiln bauxite,round kiln bauxite,shaft kiln bauxite real-time quotes, last-sale prices

rotary kiln bauxite,round kiln bauxite,shaft kiln bauxite real-time quotes, last-sale prices

Characteristics:1. Chemical stability,2. Good physical properties.3. High volume density.4. High refractoriness.5. High temperature calcination.6. Low content of impurities.Physical and chemical indexes:Grade/ItemChemical composition %Bulk density g/cm(min)Water absorption%AL2O3Fe2O3Ti02CaO+MgOK20+Na20GAL-88>=88<=1.5<=4.0<=0.4<=0.4>=3.15<=4GAL-85>=85<=1.8<=4.0<=0.4<=0.4>=3.10<=4GAL-80>=80<=2.0<=4.0<=0.5<=0.5>=2.90<=5GAL-70>70--80<=2.0-<=0.6<=0.6>=2.75<=5GAL-60>60--70<=2.0-<=0.6<=0.6>=2.65<=6GAL-50>50--60<=2.5-<=0.6<=0.6>=2.45<=6Particle Size:Size of particles: 0-1mm,1-3mm,3-5mm,5-8mm,8-15mm,0-5mm,0-50mmSize of powder: -200mesh,-270mesh,-325meshApplications:Bauxite clinker is mainly used for manufacturing high-quality refractory products, refractory castable, sagger, kiln furniture, crucibles, precision casting industrial,refractory ceramic,ceramic fiber products, etc.Quick DetailsPlace of Origin:Shandong, China (Mainland)Refractoriness (Degree):Common (1580< Refractoriness< 1770)Brand Name:cnbmPackaging & DeliveryPackaging Details:25 kg/bags on wooden pallets standard seaworthy export packing

alumina rotary kiln refractory - rs kiln refractory bricks

alumina rotary kiln refractory - rs kiln refractory bricks

The worlds annual aluminum output takes the top position among nonferrous metals production, far larger than other nonferrous metals. Refractory material consumption of aluminum industry is much more than the total consumption of copper, lead and zinc smelting. The production of aluminum including 2 steps, first, produces alumina from bauxite by wet method, second, uses industrial alumina as raw material, adopts molten salt electrolytic process to produce aluminum. High temperature kilns used for aluminum production are rotary kiln, molten salt electrolytic tank, aluminum smelting furnaces, etc.

Refractory material consumption of industrial aluminum smelting furnaces is large, thats because, during producing Al2O3, basic material will have very severe corrosion to alumina rotary kiln refractory material. When smelting aluminum, even the temperature is relatively low, aluminum liquid has very strong permeability, once it permeates into firebricks, it will react with SiO2 and reduces Si from the firebricks, which will destroy their structure and cause the looseness, spalling and damage of furnace lining.

So SiO2 containing refractory materials are also not suitable for the masonry of aluminum smelting equipments. High alumina bricks and carbon refractories are usually used for ordinary aluminum industry furnaces.

Rotary kiln is thermal equipment for the sintering of alumina clinker. During manufacturing alumina, alumina bauxite, pure alkali and lime are proportionally loaded into rotary kiln, calcined at 1200~1300, the calcined bauxite clinker needs to be further processed to make Al(OH)3. After sintering in 1200 rotary kiln, Al2O3 are produced by Al(OH)3.

The sintering process are: high temperature flame and the raw material reversely move in the rotary kiln. Lime and bauxite raw material pulp(contains 40% water) or Al(OH)3(contains 12%~18% water) is loaded form kiln tail. After low temperature drying and dehydration, heating and high temperature sintering, calcined clinker will be unloaded from kiln head, while high temperature gas flows from kiln head to tail. So the kiln can be divided into preheating zone and high temperature sintering zone. To avoid pulp material adhering to kiln lining during sintering and to strengthen heat exchange efficiency, chains are set between refractory material brickwork, when kiln body is in rotary motion, the chains will continuously strike raw materials and lining bricks, which will affluence the service life of kiln lining.

The rotary kiln body used for alumina production is steel board welded cylinder, inner lining is constructed by refractories. The working environment of refractory materials are harsh, so they should have these characteristics: strong alkaline corrosion resistance, can continuously work at 1200~1300 high temperature and wont damage, can resist material erosion and impaction, can resist the souring of high temperature air current.

Reractories used in rotary kiln are mainly high alumina bricks and magnesia bricks. Low temperature drying kiln usually adopts fireclay bricks as inner lining refractory. At sintering zone, there is often an insulating lining between kiln wall and firebricks inner lining, which is often built by diatomite bricks, ceramsite bricks or refractory fiber felts.

Currently, unshaped refractories are popularly used in aluminum industry. Rotary kiln inlet where constantly suffers materials high temperature abrasion and thermal shock stress, is vulnerable to deformation damage. At alumina clinker sintering kiln transition zone, the temperature is between 400~1000, alkaline corrosion and mechanical damage are severe, the inner lining often spalls or falls off. So steel fiber castable which has good abrasion resistance is are usually used in rotary kiln.

Rongsheng Refractory Supplier provides kinds of refractory bricks and monolithic refractories. Exclusive customer service and refractory lining material solutions for metallurgy, nonferrous metals, building materials, electric power, petrochemical and other industries. Save production costs and improve economic efficiency.

iso9001 phosphate bonded high alumina bricks for cement rotary kiln , 230*114*65

iso9001 phosphate bonded high alumina bricks for cement rotary kiln , 230*114*65

ISO9001 Phosphate Bonded High Alumina Bricks For Cement Rotary Kiln , 230*114*65 Description: Common Refractory Phosphate Bonded High Alumina Bricks is made of high quality bauxitea as raw material, phosphate as boner. It is light burned brick which is used for small cement kiln. Our factory produces various kinds of refractory products. The products can be made according with the customers' requirement. Application: They are widely used for hot blast furnace, coke oven, and glass furnace cement kiln and rotary kiln. The products can be made according to customers' requirement. Specification: Item Phosphate Bonded High Alumina Bricks RSP Al2O3, % 75 Fe2O3, % 3.2 CaO, % 0.6 Bulk Density, g/cm3 2.65 Refractoriness C 1780 Refractoriness under load T1,C 1300 Cold crushing strength Mpa 60 Thermal conductivity, % 1000C 1.5

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