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铜尾矿砂电动增强处理过程研究

Keywords: 电动处理,尾矿砂,Cu,EDTA

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Abstract:

采用电动处理装置,研究了施加不同电压和添加不同浓度EDTA对铜尾矿砂电动处理过程的影响。结果表明,在阴极池溶液pH为3.5的H2SO4且不施加电压的情况下,Cu的去除率仅为3.2%,而当电压升至30V时,去除率增加到43.8%;在采用阴极酸度控制的H2SO4+EDTA处理中,随添加EDTA浓度(0、0.5、1.0、2.0mmol·L-1)的增加,电动处理后尾矿砂中Cu的去除率分别可达19.6%、18.3%、31.5%和37.2%。加入EDTA和升高施加电压均可增强尾矿砂中Cu的活性,提高尾矿砂中Cu的去除率。EDTA的存在降低了电动处理电流,但增加了电渗流量,而提高施加电压则显著增加处理电流。随EDTA浓度的增加尾矿砂的pH也增加,同时其电导率下降。

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