酸泥中含硒、铅、银、铜、锌等金属,用亚硫酸钠浸出其中的硒.在浸出过程中,主要研究了Na2SO3浓度、温度、时间、液固比等因素的影响.结果表明,在浸出过程中,硒进入溶液,而其他元素Ag,Cu,Zn,Fe等留在浸出渣中,浸出过程具有良好的选择性,硒的浸出率达到85％～90％.并获得了浸出过程的最佳条件:Na2SO3浓度220 g·L-1,温度120～125℃,反应时间120 min,液固比4∶1.同时研究了在亚硫酸钠浸硒体系中氯化钠及碳酸钠对硒浸出率的影响,在有添加剂氯化钠的条件下,硒浸出率能达到94％ - 96％,氯化钠的最佳用量是20～25 g·L-1;在添加碳酸钠的条件下,硒浸出率能达到96％～98％,碳酸钠的最佳用量是60 ～80 g·L-1.
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