By Thomas B. Drew (ed.), Giles R. Cokelet (ed.), John W. Hoopes (ed.), Theodore Vermeulen (ed.)
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Extra resources for Advances in Chemical Engineering, Vol. 9
Lead carbonate can bc treated by thermal decomposition or acid treatment. Lead silicate can be trrated by acid treatment. The pretreated material is leached under ambient conditions, yielding pregnant liquor containing up to 100 gm/liter P b and n barren residue. The precipitation of lead can be carried out by electrolysis to produce the metal, by removal of free ammonia, or by heating of the supersaturated leach liquor to produce ammonium sulfate, monobasic lead sulfate or a mixture of the two.
In tank or vat leaching, the raw material is prepared by crushing and grinding to optimal size before being bedded into large tanks where the solvent is allowed to percolate through the mass of the material in a matter of days. 5% acid soluble copper (M17, S10, Vl). The increased cost due to crushing, grinding, and screening can be offset by the negligible loss of pregnant liquor, higher copper recovery in a few days, and a higher concentration of copper in the solution (as high as 30 gm/liter), making possible the precipitation of high-purity metallic copper (such as by electrolysis) instead of lower-grade cement copper obtained by precipitation with scrap iron.
The acid consumptior was only a third of that required at atmospheric pressure and the titanium and iron concentration in solution were effectively reduced. The leaching of uraninite ore, containing iron and copper sulfide and L siliceous slat,y gangue, by in silu generation of sulfuric acid during thf reaction was 3150 tried. The ore was pulped a t 50% solids with matei in the presence of 3% MnOz as an oxidant. I n the absence of oxygen 29% UsOsmas dissolved, this being attributed to the presence of sulfatc in the ore.
Advances in Chemical Engineering, Vol. 9 by Thomas B. Drew (ed.), Giles R. Cokelet (ed.), John W. Hoopes (ed.), Theodore Vermeulen (ed.)