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用含有少量NaOH的Na_2S溶液浸取铜精矿,可以除去铜精矿中呈化学结合的砷,使铜精矿能达到冶炼要求。所得到的Na_3AsS_4或Na_3AsS_3转化为可以安全处理的硫化砷。有价钠和硫可以回收返回浸出工序。
The leaching of copper concentrate with Na 2 S solution containing a small amount of NaOH can remove arsenic chemically bound in the copper concentrate and make the copper concentrate meet the smelting requirements. The resulting Na_3AsS_4 or Na_3AsS_3 is converted to arsenic sulfide that can be safely treated. Valuable sodium and sulfur can be recycled back to the leaching process.