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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。
Sludge containing selenium, lead, silver, copper, zinc and other metals, which leaching with sodium sulfite selenium. In the leaching process, the main effects of Na2SO3 concentration, temperature, time, liquid-solid ratio and other factors. The results show that during the leaching process, selenium enters the solution, while other elements such as Ag, Cu, Zn and Fe remain in the leached residue. The leaching process has good selectivity and the leaching rate of selenium reaches 85% -90%. The optimum conditions of the leaching process were as follows: the concentration of Na2SO3 was 220 g · L-1, the temperature was 120 ~ 125 ℃, the reaction time was 120 min and the liquid-solid ratio was 4:1. The effects of sodium chloride and sodium carbonate on the leaching rate of selenium in sodium sulfite leaching selenium system were also studied. Under the condition of additive sodium chloride, the leaching rate of selenium can reach 94% ~ 96%. The optimal dosage of sodium chloride Is 20 ~ 25 g · L-1. With the addition of sodium carbonate, the leaching rate of selenium can reach 96% ~ 98% and the optimum dosage of sodium carbonate is 60 ~ 80 g · L-1.