Copper ore heap leaching of waste
The process of copper ore heap leaching is: heap leaching-extraction-electrowinning; full liquid circulation is implemented. These include heap leaching-extraction-raffinate water phase return heap leaching; saturated organic reverse extraction-back extraction (rich) liquid electrowinning, and electrowinning tail liquid returned to the stripping solution for two cycles. To date, leaching copper heap leaching agent are used as sulfuric acid, by oxidation of the copper sulphide ore or iron Thiobacillus ferric sulfate as an oxidant.
From the copper heap heap leaching process, it produces waste similar to that produced by acid uranium heap leaching; however, it has no harmful effects of radioactivity and therefore has less environmental hazards. Copper heap leaching of wastes to the environment contaminated wastewater heaviest; waste pollution of the environment, often with heavy metals from the heap and the effluent solution is an acidic solution ionic contamination environment; not the whole heap leaching copper It will produce a gas that is harmful to the environment. In summary, there are two wastes generated by copper heap heap leaching:
First, wastewater
The toxicity of wastewater is mainly reflected in the acidity of the wastewater itself, the heavy metal ions and arsenic produced by the reaction of the leaching agent with minerals and gangue, and the organic phase introduced during the extraction process.
Second, waste residue
It consists of two parts, one of which is acid-impregnated waste rock, and the other is the sludge produced by the neutralization process. When the copper sulfide ore heap is immersed, because a large amount of iron enters the leachate, the waste generated by the wastewater treatment is large in volume and difficult to handle; in areas with acid rain, the sewage is likely to cause secondary pollution.
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