|Home||» Products||» Refractory Grade Calcined Bauxite||» Refractory Grade Calcined Bauxite|
Refractory Grade Calcined Bauxite
Keeping pace with ongoing market norms we are engaged in providing an excellent quality Refractory Grade Calcined Bauxite that is highly acknowledged by clients. Offered chemical is extensively used in numerous application in Refractory bricks, Grinding media (Abrasives), Road surfacing material, Proppants, Alumina cement and Ceramics . This chemical is processed by making use of innovative technology. Moreover, this Refractory Grade Calcined Bauxite is available with us in numerous packaging options and can be availed at affordable prices.
Precise pH value
Refractory Grade Calcined Bauxite
Bauxite, an aluminium ore, is the world's main source of aluminium. It consists mostly of the minerals gibbsite Al(OH)3, boehmite ÃŽ³-AlO(OH) and diaspore ÃŽ±-AlO(OH), mixed with the two iron oxides goethite and haematite, the clay mineral kaolinite and small amounts of anatase TiO2. Calcined Bauxite is used as raw material for manufacturing fused alumina and high alumina refractories.
On an average 4-5 tonnes of bauxite are needed to produce two tonnes of alumina from which only one tonne of aluminium can be produced. Aluminium is possibly the most versatile product with applications in almost every industry and since bauxite is the primary source for aluminium it will always be in great demand. 15% of bauxite goes into refractory, chemical , cement ,abrasives and other applications.
Bauxite is usually strip mined because it is almost always found near the surface of the terrain, with little or no overburden. Approximately 70% to 80% of the world's dry bauxite production is processed first into alumina, and then into aluminium by electrolysis as of 2010. Bauxite rocks are typically classified according to their intended commercial application: metallurgical, abrasive, cement, chemical, and refractory.
Usually, bauxite ore is heated in a pressure vessel along with a sodium hydroxide solution at a temperature of 150 to 200 Ã‚°C. At these temperatures, the aluminium is dissolved as an aluminate (the Bayer process). After separation of ferruginous residue (red mud) by filtering, pure gibbsite is precipitated when the liquid is cooled, and then seeded with fine-grained aluminium hydroxide. The gibbsite is usually converted into aluminium oxide, Al2O3, by heating. This mineral is dissolved at a temperature of about 960 Ã‚°C in molten cryolite. Next, this molten substance can yield metallic aluminium by passing an electric current through it in the process of electrolysis, which is called the HallÃ¢â‚¬â€œHÃƒ©roult process.
Calcined Bauxite is obtained by calcining (heating) superior grade Bauxite at high temperature (from 850 Ã‚°C to 1600 Ã‚°C). This removes moisture thereby increasing the alumina content. Compared to an alumina content of about 57 % to 58 % in raw Bauxite, Calcined Bauxite has an alumina content of 84 % to 88 %. The heating is carried out in rotary kilns.
We produce Calcined Bauxite for various applications such as refractory bricks, abrasives, steel polishing, etc. We are committed to provide consistency in quality and availability of product at extremely competitive prices. "
The Chemical composition of bauxite is as under:
SAMPLING & ANYLYSIS OF BAUXITE :
|LOT NO.||Al2O3||Fe2O3||T. SiO2||R.SiO2||CaO||TiO2||LOI||Sieve Test|