Silica in bauxite is mainly found in the form of Kaolinite and quartz. Hematite, Goethite, Anatase, Rutile are the other mineral impurities presents in minor or traceable amounts in Bauxite. Some other gangues of minerals presents in some type of Bauxites are chamosite, pyrite, siderite, ilmenite, sphene, calcite and dolomite. More than 99% Bauxite chemical composition constitutes Al2O3, Fe2O3, SiO2, TiO2 and Loss on Ignition, the rest is contributed by FeO, CaO, MnO, MgO, K2O, Na2O and P2O5. Silica (SiO2) mainly presents in Bauxite in form of kaolinite and quartz respectively known as “reactive” and “free” silica.

Product Features

  • Uses & Specifications
  • Bauxite is primarily used to produce alumina through the Bayer process. Aluminum industry normally uses bauxite containing minimum 38% Al2O3. However, slightly inferior grades with a suitable blend are also used, depending upon other characteristics, such as solubility in caustic soda and absence of silica. The characteristics of major Indian bauxite are summarized in Table – 3.
  • Consumption
  • Consumption of bauxite reduced to 11.77 million metric tons in 2010-11, compared to 12.23 million metric tons in the previous year. With 91% consumption of total production Alumina/aluminum industry was the principal consumer in 2010-11 followed by cement (7.5%) and refractory (1%) (Table-8). Gujarat was the main supplier of abrasive and refractory grade bauxite.