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

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

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Between 45 and 9O"C, the reaction of cubanite with acidic ferric sulfate solutions followed linear kinetics, indicating that the rate-controlling step was some reaction occurring on the surface of the cubanite. The dissolution rate increased with ferric ion concentration and decreased with increasing concentration of sulfuric acid and ferrous sulfate. The naturally slow reaction was accelerated with the addition of NaCl or HC1. The addition of salt in a dump leaching operation would be a relatively easy and cheap procedure to attain increased reaction rates.

The leach solution is sprayed at the top of the caved-out areas and is allowed to percolate down to the bottom where it is collected behind specially built bulkheads. This pregnant solution is pumped to the surface for precipitation of the copper with iron. The recovery of UIOe by leaching in place has been described by MacGregor (M 1). A predetermined cycle of fast, high-pressure washing and rewashing of stopes and the intermittent spraying of low-grade heaps with fresh water and recirculated acid water has been found most effective.

C23). 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).

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