Calcined Bauxite
Calcined bauxite is a processed form of bauxite ore, an aluminum ore, that has been heated to high temperatures to remove moisture and increase its alumina (aluminum oxide) content. This process, known as calcination, results in a material with enhanced properties that make it suitable for various industrial applications
Calcined Bauxite
Producer
Parsis Commerce is an investor, producer and supplier of calcined bauxite& related products to a wide variety of industries throughout the world.
Our factory has the well-equipped facilities and excellent skills throughout all stages of production, which makes annual capacity exceeds 60,000 tons. Good quality raw materials, process making strictly, uniform sintering and compact structure, which gained the superior and satisfactory bauxite.
Parsis Commerce mainly produce welding grade bauxite, HFST bauxite, porcelain insulator bauxite, cement grade bauxite, and refractory grade bauxite. Further more, we have close relationship with producers of dead burnt magnesia and calcined kaolin due to our long business involved in refractory and abrasive industries. Parsis Commerce is growing fast but always holds principle of first quality, best service and last price. Parsis Commerce has become one global leading supplier of calcined bauxite.
Bauxite Types
We have a local producer and exporter of refractory grade bauxite, these are major type of them:
BAUXITE
our bauxite is from China . high alumina and low iron.
Everything you need Know
What is calcined bauxite?
Calcined bauxite with chemical formula Al2O3 is a widely used product that has many applications in the manufacturing building blocks, extraction, and casting of iron and cast iron, and production of refractory materials and bricks.
Bauxite is sedimentary rock and contains aluminum with a grade of more than 45%. The bauxite ore is used to produce aluminum metal, and often contains gallium deposition, so it is also a source of gallium. The industrial extraction of aluminum from bauxite is performed using the Bayer process.
Calcined bauxite is produced by calcination of bauxite ore at 900 to 1700 °C by a rotary kiln or multiple hearth furnace kiln (known as a vertical calciner). Applying temperatures about 1650 to 1700 °C leads to the sintering or frittage.
Consumption of calcined bauxite in fire-resistant materials such as alumina mortars and refractory bricks increases the compressive strength as well as shock resistance of the refractory bricks and lead to more product sales due to better quality.
Calcined bauxite production method
Calcined bauxite is produced by heating and sintering bauxite ore in a rotary kiln at 900 to 1700 °C. Depending on the application of the product, the applied calcining temperature is various. For example, for application in the production of aluminum sulfate, a temperature of 900 °C is suitable, and for application in the production of steel and cast iron, a temperature about 1450 °C is required.
To produce refractory materials and sintering, the furnace temperature must be raised to 1700 °C. Due to the creation of dust in the rotary kilns, in order to prevent material waste and environmental pollution, it is necessary to install a dust collector cyclone and a filter bag on the rotary kiln.
Then, the molten materials are passed through a rotary cooler and after grinding and granulation are ready, in different particles size, for sale.
applications of calcined bauxite
- Production of refractory soil, materials, and bricks
- Used to prevent slippery roads and passages
- Production of sandpaper and abrasive plate
- Iron mining and extraction, cast iron and foundry industries
- Production of aluminum sulfate and aluminum compounds such as hydroxide and aluminum oxide
Welding Grade Bauxite
Welding grade bauxite has tight regulation on presence of sulphur and phosphorus which are detrimental to the weld. When present at high concentrations, they induce porosity and cracking, and at lower concentrations, they adversely affect the impact strength of the weld. And moisture for welding grade bauxite should not exceed 0.5% because the potential for any moisture present with thin the flux to reduce to hydrogen, if exposed to a welding arc, the molten weld pool absorbs the hydrogen and will induce brittleness into the weld.
Application
Welding fluxes are a small but valuable market for calcined bauxite. Techniques
for submerged arc welding require the use of a granular flux to shield the molten weld pool from the atmosphere during the weld’s application or placement.
Various proprietary compositions exist and in some cases calcined bauxite is incorporated into these formulations. Calcined bauxite may, in some instances,
make up to 25% of the welding flux.
powder size
- 80mesh; 100mesh; 200mesh; 325mesh; or as customer’s requirement.
HFST Bauxite
Calcined bauxite has traditionally been the most commonly used aggregate material used for High Friction Surfacing. The inherent nature of Calcined Bauxite resists shear stresses that lead to polishing of the road surface. Its hardness isalso beneficial in internal and external industrial flooring applications where a very hard and long-lasting mineral is required to give high-friction, anti-slip performance. Calcined Bauxite has been found to exhibit characteristics far superior to alternative road surface aggregates
Application
The majority of public sector systems will specify that Calcined Bauxite be used in their road and pedestrian crossing installations including the danger zone on the highway, the urban traffic roundabouts, the traffic sign, the traffic jam road, the pedestrian crosswalk, the deceleration area, the bikeway, the bridge, the platform, the truck park, the handicapped spaces and other parking lots, the stadium, the factory and industrial zone, the airport, the railway, the bus station, the leisure district, the beautify area and etc make up to 25% of the welding flux.
Available grain size
- 80mesh; 100mesh; 200mesh; 325mesh; or as customer’s requirement.
Shaft kiln bauxite
Application
Shaft kiln bauxite, the bauxite calcined by shaft kiln. The raw material – bauxite
ore is loaded from the top of kiln together with coal powder and combustion improver, the fire of calcination comes from kiln bottom, about 1300-1400 degree. After the complete calcination, the bauxite is carried out from the bottom. Comparing with rotary kiln, the sample shaft kiln can save many cost and produce the similar bauxite, so it is popular with most of producers.
Available grain size
- 0-1mm; 1-3mm; 3-5mm; 5-8mm; 200mesh
Porcelain Insulator Bauxite
Electrical porcelain insulator has high requirements about the mechanical properties, electrical properties, environmental performance (cold and hot, squalidity, aging resistance, etc.). Using calcined bauxite as the material could meet this requirement perfectly. Porcelain insulator bauxite has good intensity and its long-term performance could also reduce the manufacturing cost. It also has well isolative and mechanical strength, both its rigidity and heat stability are higher than others, its hot and cold impact performance is also superior
Application
Most high voltage insulators producers choose calcined bauxite powder as necessary raw materials for manufacturing electrical porcelain insulators used for electric line, power station, protector and switches etc. The porcelain insulator that burns by high-temperature firing from the bauxite, kaolin, feldspar and other natural minerals is widely applied to electric power industry system. To produce the porcelain, calcined bauxite is used instead of alumina. The simultaneous addition of clay and kaolin, in each case containing more than 5% by weight of foreign metal oxide inclusions, results in a porcelain which, compared to an alumina porcelain of the same mechanical strength, can be produced at significantly lower cost. The porcelain is suitable in particular for applications for highly mechanically loaded components used in electrical insulation
Available grain size
- 98% passing min at 325mesh, or as customer’s requirement
Cement Grade Bauxite
Calcined bauxite used in high alumina or calcium aluminate cements range considerably in chemical composition. A high silica content hampers the hardening property of the cement. This means the silica content must be controlled and a typical industry requirement is that the Al2O3:SiO2 ration is around 10:1. And the maximum acceptable amount of Fe2O3 allowed in the low iron oxide type may reach 3%, although it is commonly max 2.5%.
Application
Calcium aluminate cement, alumina cements or high alumina cements are obtained by the reaction at high temperature of lime (from limestone) and alumina (contained in natural minerals like bauxite). The product obtained after cooling is a hard mineral: calcium aluminate clinker. Crushed or screened, it is used as an aggregate. The composition and colour – ranging from the purest white to jet black – depends on the proportion of each raw material. Ground into a fine powder, the clinker becomes calcium aluminate cement (CAC) which forms a paste when mixed with water. This has the ability to harden very quickly: it forms a rigid solid within 24 hours
Available grain size
- 5-50mm (passing min 90%), or as customer’s request
Refractory Grade Bauxite
Calcined bauxite is produced by sintering/calcining of low iron, low alkali containing raw bauxites at temperatures of 1600 – 1800 degree Celsius. In this calcination process the high refractory mineral phases corundum and mullite are formed.
Refractory grade bauxite has high refractoriness, good mechanical strength and moderate slag resistance. Therefore, calcined bauxite is one of the most important raw materials for the production of shaped and unshaped refractories for the steel industry, foundries, glass and cement plants.
Application
Refractory applications remain the premiere non-metal market for calcined bauxite which is mixed with binders and pressed, extruded, cast and shaped into a variety of forms that are then dried and transferred to kilns for firing. The calcined refractory grade bauxite is also used in unfired monolithic refractories.
It should be noted that another source of materials suitable for refractory use is the calcined bauxite used to produce brown fused alumina, which has higher mechanical and chemical corrosion resistance than other high alumina refractory raw materials
Available grain size
- 0-1mm; 1-3mm; 3-5mm; 5-8mm; 16-30mesh; 30-60mesh; 120mesh;
200mesh; 325mesh or as customer’s requirement
Abrasive Grade Bauxite
Abrasive grade bauxite, the feedstock for brown fused alumina, is prepared from low silica, low alkali material that is calcined at temperatures of approximately 1100 C. The minimum alumina content of 80% on a calcined basis is normally required for this application. And the upper limit on the silica content is 5%. Titania is ideally in the range of 2% to 4%. And low concentrations of alkalise are a requisite in order to minimize the formation of a glass phase. Besides these strict chemical specifications, particle size is especially critical for abrasive production. The upper limit on particle size is 50mm with the lower threshold set at a 100 mesh screen size.
Application
Some calcined bauxite is used directly as an inexpensive abrasive product, but by far the largest amount is used as the feedstock for the manufacture of brown used alumina. Brown fused alumina is produced by the electrofusion of calcined bauxite in electric arc furnaces at temperatures in excess of 2000 C
Available grain size
- 0-50mm, or as customer’s request.
Sintered Bauxite
Sintered bauxite is made by sintering fine bauxite ore. Bauxite is the main ore used to produce Aluminium and consists 75% of Aluminium Oxide. It is a hard and unyielding abrasive in spherical shapes
Application
Bauxite beads are Often used to replace brown fused aluminium oxide, Bauxite beads can be used with conventional abrasive blasting equipment, air-compressed pressure and suction jet blasting equipment. Sintered bauxite is also used for the following applications: antiskid flooring, carving etching, finishing, grinding, lapping, polishing, rock tumbling, lapidary, sandblasting, slurry mixes, surface preparation and tumbling. It is exceptionally well suited for use with air-compressed jet blasting equipment, both pressure and suction
Available grain size
- 0-50mm, or as customer’s request.
Dead Burnt Magnesite
Dead burnt magnesite is produced in the rotary kiln by sintering raw magnesite at a controlled temperature of 1750 degree centigrade.
Application
Dead burnt magnesite is known as refractory magnesia, is the primary component in refractory materials. The steel industry, for instance, is the largest user of refractory magnesia
Available grain size
- 0-50mm, or as customer’s request.
Calcined Kaolin
Calcined Kaolin is an anhydrous aluminium silicate produced by heating ultrafine natural kaolin to high temperatures in a kiln. The calcination process increases whiteness and hardness, improves electrical properties, and alters the size and shape of the kaolin particles
Application
Our calcined kaolin is mainly used in the fields such as paint, paper, rubber, engineering plastic, cable, ink to replace TiO2 and cut cost
Available grain size
- 0-50mm, or as customer’s request.
Contact us now!
We have deep deposition in the knowledge of battery component, metals, ceramic, metallurgy and refractories
