More information on Bauxite

Bauxite

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Bauxite is a naturally occurring, heterogeneous material composed primarily of one or more aluminium hydroxide minerals, including the trihydrategibbsites, the monohydrate polymorphs boehmite and diaspore plus various mixtures of silica, hematite (iron oxides), siderite (iron carbonates) and other impurities in trace amounts. Most bauxite deposits contain rutile, anatase, zircon and other minerals.

Lateritic bauxites (silicate bauxites) are predominantly found in tropical and subtropical countries, while carbonate bauxite are found mostly in Europe.

Bauxites are typically classified according to their intended commercial application: abrasive, cement, chemical, metallurgical, refractory among others. The vast majority of world bauxite production, approximately 85%, is used as raw material for the manufacturer of alumina through a wet chemical caustic leach method commonly known as the Bayer process.

Subsequently, the bulk of the resulting alumina produced from this refining process is in turn employed as the feedstock for the production of aluminium metal by the electrolytic reduction of alumina in a molten bath of natural or synthetic cryolite, Hall-Heroult process.