Beneficiation of Bauxite

Prasad, S S and Rao, S B (1968) Beneficiation of Bauxite. In: Symposium on Non-ferrous metals Technology. NML Jamshedpur, Jamshedpur, pp. 38-41.



BAUXITE deposits generally occur at or near the surface and are usually covered with shallow layer of overburden. The ore is almost invariably mined by open pit methods. The usual practice is to thoroughly strip and clear the overburden, after which the ore body is blasted to permit excavation by mechanical shovels. Some deposits contain highly siliceous clays and ferruginous materials distri-buted intimately throughout the ore, and it is often necessary to beneficiate the bauxite to provide a desired quality of product. A primary objective of the beneficiation process is to reduce the silica content in the ore, as the latter reacts with caustic soda during the digestion step to precipitate out as insoluble sodium aluminium silicates, e.g. 2Na2O.2Al203.3Si02.2 H20. This salt is eliminated from the process along with the insoluble iron & titanium oxides in red mud, consequently entailing the loss of valuable alumina and caustic soda from the process.

Item Type:Book or NML Publication
Official URL/DOI:
Uncontrolled Keywords:Sodium aluminium silicates, Titanium oxides
Divisions:Metal Extraction and Forming
ID Code:3762
Deposited By:Sahu A K
Deposited On:13 Aug 2011 18:26
Last Modified:06 Jan 2012 11:27
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