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

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

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This indicates that the reaction was diffusion controlled through a constantly thickening layer of reaction product, possibly sulfur on the surface of chalcopyrite. 01 MI the rate of leaching was controlled by the inward diffusion of Fe2(S04)3and at higher frrric sulfate concentrations, the outward diffusion of ferrous sulfate through the sulfur layer controlled the rate. Changes in acid concentrations and in speed of disk rotation did not have any effect on the leaching rate, indicating that the rate of agitation in a commercial operation would have no effect on the rate of leaching.

This bacterium belonging to the genus Thiobacillus was given the name Thiobacillus ferroridans (T2). It rapidly oxidizes ferrous ions in acid solution, does not grow on sulfur, uses thiosulfate as the sole energy source, and increases the formation of acid from pyrite (T3). Lcathen and Braley (L3)isolated Fmobacillus ferroridans in 1954, a bacterium with the ability to oxidize rapidly ferrous iron to the ferric state a t p H 2 4 . 5 without appreciably oxidizing acid thiosulfate and sulfur (L5,S17).

The other metals that form amine complexes such as Cu, Xi, Co, Zn, and Cd are not precipitated by CO2. The us? of ethylene glycol as the solvent for leaching high-grade scheelite concentrates to produce high-purity tungstic acid from which high-purity tungsten oxide is obtained has been described by Forward and Vizsolyi (F13). The process consists of treating the CaW04 with sulfuric acid a t 100°C to produce a solid mixture of tungstic acid (HzW04) and CaS04. %HzO,togcther with SiOz and other insoluble impurities.

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