| 摘要 |
An improved process for accelerating the precipitation of copper from solution. A pregnant leach solution, containing at least copper, ferric, ferrous, and sulfate ions, is treated with sulfur dioxide under conditions of agitation to complex the ferric ions and to efficiently maintain the treated leach solution at a pH below 3.0, without the addition of acid. The complexing of the ferric ions prevents these ions from oxidizing the metallic iron utilized in the precipitation of copper, thereby significantly reducing metallic iron requirements, and, coupled with the maintenance of a lower pH, increasing the amount of copper precipitated.
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