| 摘要 |
A method of recovering of oxidized copper from limestone gangue ores in which finely ground ore is leached with a caustic solution with gentle agitation and heat in stages, pregnant caustic solution from a succeeding stage being used to leach ore in a preceding stage; the ore in the final stage is leached with a copper barren caustic solution with gentle agitation and heat; copper sponge produced from the pregnant caustic solution by electrolysis, and the resulting copper barren caustic returned for re-use. Lime is used to recausticize dilute caustic from the final wash of the solids, and the thus recausticized solution is concentrated and also returned for re-use.
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