New PDF release: Advances in Chemical Engineering, Vol. 9

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

ISBN-10: 0120085097

ISBN-13: 9780120085095

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In a large-scale operation, the problems of preventing the loss of solvent from the mining area and the recovery of the pregnant liquor are the major considerations. The complexity of the ore-solutionfluid flow interaction in the reservoir fractures, fissures, and heterogeneities can probably be solved by the creation of hydrodynamic barriers. , by the petroleum industry are applicable to solution mining. Davis (D2) reported the results of a field test that involved the isolation of a uranium ore body by surrounding it with a curtain of grout material.

The reactions of acid chlorine solutions with galena (PbS), pyrite (FeSz), sphalerite (ZnS), chalcocite (CuzS), covellite (CuS), chalcopyrite (CuFeSz), bornite (Cu5FeS4),pyrrhotite (FeS), and arsenopyrite (FeAsS) were examined with respect to their reaction rates and mechanisms. Three primary reactions were observed between aqueous chlorine and the base-metal sulfides. Elemental sulfur was produced during the reaction with chalcocite, bornite, and covellite. A rapid oxidation of the pyrrhotite, pyrite, and arsenopyrite to the sulfate form was observed.

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 leaching of mercury ores and flotation concentrates is an attractive alternative to the recovery of mercury by the direct retorting process especially when the ore is low grade, wet, high in pyrite, and contains arsenic and ant,imony. In addition to a low recovery (as low as 60%), the health hazards from the vapors and dust must also be minimized if not completely eliminated.

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


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