Production of alumina from clays

CIM MineSpace 2001
Claude Bazin, Valérie Ouellet, Stephane Chabot, Marc Minville,
Abstract Quebec province in Canada is a major producer of aluminium through electrolysis of alumina. The alumina used to feed the electrolysis cells is imported from foreign countries where it is extracted from bauxite. Other alumina sources, such as clays, have been considered as potential substitutes for bauxite. We find in Murdochville, QC, and nearby a large clay source containing significant amounts of alumina, a source of sulfuric acid and sulfur dioxide, some mining and smelting intallations, electricity and a sea port. These features could make sense for an industrial project of alumina extraction from clay. This paper reviews some of the investigated processes to extract alumina from clay and presents the results of the initial work carried out on the clay available in Murdochville.
Keywords: Hydrometallurgy, Leaching
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