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
D. Solution Mining. The dissolution of the valuable component of the ore a t its original place of formation and the subsequent recovery of the pregnant solution a t the surface is referred to as solution mining, in situ, or in-place leaching. The best known and most successfully used solution mining technique HYDROMETALLURGY 33 is the Frasch process for the. recovery of elemental sulfur. In the last decade, the focus of attention has mainly been on trona (B9, Cl), potash (C14, D3,03),and uranium (D2,515) in addition to copper.
P3) have developed a process of refining mixed-base-metal mattes of nickel, copper, cobalt, and iron by acid or ammonia pressure leaching followed by hydrogen reduction to powder metal. For mattes that will be refined by hydrometallurgical processes, the iron and sulfur content must be decreased to a minimum consistent with good recovery of the base metals since both constituents will otherwise require additional oxygen or air for oxidation during the processing. The preferred leaching step is influenced by the analysis of the matte, with those containing over 3% cobalt more amenable to acid pressure leaching and those low in cobalt being treated by ammonia leaching.
The relatively low capital expenditures required for a heap leaching operation make it ideal for small ore bodies such as the Bluebird mine of Ranchers Exploration in Miami, Arizona (M27, SlO) which cannot otherwise be economically developed. The primary drawbacks of this method are the low copper recoveries and the relatively high acid consumptions. Johnson and Bhappu (57) examined the factors that influenced these shortcomings with the purpose of establishing a basis of correlation between laboratory and field testing.
Advances in Chemical Engineering, Vol. 9 by Thomas B. Drew (ed.), Giles R. Cokelet (ed.), John W. Hoopes (ed.), Theodore Vermeulen (ed.)