Name two processes used for leaching of bauxite.Write names of leaching agents used in these processes.
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Hall's process for leaching of alumina from bauxite:
(1) Bauxite ore and sodium carbonate are fused toghether to convert aluminium oxide into soluble sodium meta-aluminate. The insoluble residue contains the impurities of silica and iron oxide. The fused mass is treated with water.
(2) The filtrate is warmed and neutralised by passing carbon dioxide through the solution to precipitate aluminium hydroxide.
(3) The precipitate obtained of Al(OH)
3
in both processes is washed dried and heated (ignited) to get Al
2
O
3
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Hall's process and Baeyers process agents are Ammonia and alkali and acid
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