Download Advances in Chemical Engineering, Vol. 9 by Thomas B. Drew (ed.), Giles R. Cokelet (ed.), John W. Hoopes PDF

By Thomas B. Drew (ed.), Giles R. Cokelet (ed.), John W. Hoopes (ed.), Theodore Vermeulen (ed.)

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The 2 4 % manganese present was converted to manganous oxide during the reduction stage and upgraded to 20 or 30% during the magnetic separation for iron. The formation of manganese silicates during the reduction tied up a good fraction of the manganese which was insoluble in dilute sulfuric acid. It also resulted in the dissolution of a large amount of soluble silica. The dissolution of iron and silica was suppressed by leaching with sulfuric acid at elevated temperatures under oxygen pressure in an autoclave.

Percolation leaching in tanks, heap leaching, and in-place solution mining of ores from worked out mines up to the present century are reviewed. HYDROMETALLURGY 31 c. Dump Leaching. I n the large-scale open-pit method of mining, a large portion of the tonnage moved consists of below-grade materials which must be removed in order to reach the ore. The waste materials are moved by trucks or train and then deposited in nonmineralized areas of the mine, taking advantage of existing topography. The selection of the dump site is made on the basis of having an impermeable bottom and being able to direct the downward flow of pregnant solution to a common collection point by taking advantage of the canyons and valleys.

The 2 4 % manganese present was converted to manganous oxide during the reduction stage and upgraded to 20 or 30% during the magnetic separation for iron. The formation of manganese silicates during the reduction tied up a good fraction of the manganese which was insoluble in dilute sulfuric acid. It also resulted in the dissolution of a large amount of soluble silica. The dissolution of iron and silica was suppressed by leaching with sulfuric acid at elevated temperatures under oxygen pressure in an autoclave.

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