BAUXITE (Grounded & Calcined)

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BAUXITE (Grounded & Calcined)

Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate. It is the primary ore of aluminum. Almost all of the aluminum that has ever been produced has been extracted from Bauxite.
Bauxite is typically a soft (H:1-3), white to gray to reddish brown material with a pisolitic structure, earthy luster and a low specific gravity (SG: 2.0-2.5). These properties are useful for identifying Bauxite; however, they have nothing to do with Bauxite's value or usefulness. This is because Bauxite is almost always processed into another material with physical properties that are distinctly different from Bauxite.

Bauxite is the principal ore of aluminum. The first step in producing aluminum is to crush the Bauxite and purify it using the Bayer Process. In the Bayer Process the Bauxite is washed in a hot solution of sodium hydroxide which leaches aluminum from the Bauxite. The aluminum is precipitated out of solution in the form of aluminum hydroxide, Al(OH)3.
Aluminum is smelted from the alumina using the Hall-Heroult Process. In the Hall-Heroult Process the alumina is dissolved in a molten bath of cryolite (Na3AlF6). Molten aluminum is removed from the solution by electrolysis. This process uses an enormous amount of electricity. Aluminum is usually produced where electricity costs are very low.

Sintered Bauxite is also used as an oil field proppant. In drilling for oil and natural gas the reservoir rock is often fractured by pumping fluids into the well under very high pressures. The pressure builds up to very high levels that cause the reservoir rock to fracture. When fracturing occurs water and suspended particles, known as "proppants" rush into the fractures and push them open. When the pumps are turned off the fractures close trapping the proppant particles in the reservoir. If an adequate number of crush-resistant particles remain in the reservoir the fractures will be "propped" open allowing for a flow of oil or natural gas out of the rocks and into the well. This process is known as hydraulic fracturing.

Bauxite Grounded

Application & Usage

  • Cement Industry
  • Chemical Industry
  • Metallurgical Industry
  • Refractory

Chemical Properties

CaO 3.13 %
S03 0.84 %
MgO 0.30 %
Fe2O3 3.80 %
Al2O3 43.00 %
L O I 17.81 %
TiO2 2.10 %

Calcined Bauxite

Bauxite is the principal ore of Aluminium, composed mainly of hydrous aluminium oxides and aluminium hydroxides. These minerals are Gibbsite, Boehmite and diaspore. Bauxite is formed through laterization of aluminious rocks. This bauxite is heated at a very high temperature to get Calcined bauxite.

Chemical Properties

Al2O3 85 - 87 %
SiO2 3 - 5 %
TiO2 5 - 7 %
Fe2O3 3 - 5 %
C 0.10 % Max
S 0.03 % Max
P 0.04 % Max
LOI at 1000°C 0.60 % Max
Moisture 0.20 % Max


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