次亚磷酸盐在电解铜氰废液同时回收铜和氰过程中的作用

发布时间：2018-03-29 01:07

本文选题：废水处理　切入点：次亚磷酸盐　出处：《工程科学学报》2017年03期

【摘要】：以高浓度铜氰溶液为研究对象,通过添加次亚磷酸盐,进行了高碱条件下电积回收铜与氰化物的研究.研究了次亚磷酸盐用量、温度对铜和氰化物沉积过程的影响;利用线性循环伏安、恒电位电解并结合X射线衍射分析阳极沉淀物的物相,分析了阳极反应机理和次亚磷酸盐抑制氰化物分解的机理;采用电解后余液进行金的氰化浸出实验.结果表明:次亚磷酸盐可有效抑制电沉积过程中氰化物的分解,其抑制效果随温度升高而增强.电解过程中阳极表面生成的Cu~(2+)是造成氰化物分解的主要原因;次亚磷酸盐通过优先与Cu~(2+)发生氧化还原反应从而抑制氰化物的分解.处理后余液对金的氰化浸出无不良影响,通过电解可综合回收铜氰废水中金属与氰化物,处理后废水可循环利用.
[Abstract]:The recovery of copper and cyanide from copper and cyanide was studied by adding hypophosphite in high concentration copper cyanide solution. The effects of hypophosphite content and temperature on the deposition process of copper and cyanide were studied. The phase of anodic precipitate was analyzed by linear cyclic voltammetry, constant potential electrolysis and X-ray diffraction. The mechanism of anodic reaction and the mechanism of hypophosphite inhibiting cyanide decomposition were analyzed. The cyanide leaching experiment of gold was carried out in the residual solution of electrolysis. The results showed that hypophosphite could effectively inhibit the decomposition of cyanide during electrodeposition. The inhibition effect is enhanced with the increase of temperature. The main cause of cyanide decomposition is the formation of Cu~(2 on the anode surface during electrolysis. Hypophosphite inhibited the decomposition of cyanide by preferentially redox reaction with Cu~(2. After treatment, the residual solution had no adverse effect on the cyanide leaching of gold. Through electrolysis, metals and cyanide in copper cyanide wastewater could be recovered synthetically. The treated wastewater can be recycled.
【作者单位】：东北大学冶金学院;装甲兵工程学院装备再制造技术国防重点实验室;
【分类号】：X758;TF811

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