高砷铜电解液中旋流电积脱杂

Remove impurity from high arsenic-content copper electrolyte by cyclone electrowinning technology

针对高砷铜电解液中砷、锑、铋等杂质含量高,铜含量低的特点,采用旋流电积技术对其进行电积脱杂。考察电流密度、循环流量和铜离子含量对砷、锑、铋等杂质脱除率的影响。4 L小试结果表明:在电流密度500 A/m^2、循环流量250 L/h,铜离子浓度1~3 g/L的条件下,砷、锑和铋的脱除率分别达90.56%、98.90%、99.99%,电积产物黑铜渣中铜-砷比低至0.50。600 L扩试结果表明:在电流密度800 A/m^2、循环流量6000 L/h,铜离子浓度0.5~3 g/L的条件下,砷、锑和铋的脱除率分别达89.30%、80.00%、99.99%。采用旋流电积技术进行电积脱杂可以有效降低铜的损失,避免砷化氢气体的产生,脱杂效果明显。

The cyclone electrowinning technology was used to remove As, Sb and Bi from copper electrolyte with high impurity and low copper content. The effects of current density, flow rate and copper concentration on the removal rates of As, Sb and Bi were investigated. The lab test, with a electrolyte volume of 4 L, shows that the removal rates of As, Sb, Bi can reach to 90.56%, 98.90% and 99.99%, respectively, under the conditions including current density of 500 A/m^2, cycling flow rate of 250 L/h, concentration of copper ranging from 1 to 3 g/L. And the ratio of copper and arsenic of black copper sludge is as low as 0.50. The enlarge test, with a electrolyte volume of 600 L, shows that the removal rates of As, Sb, Bi can reach to 89.30%, 80.00% and 99.99%, respectively, under the conditions including current density of 800 A/m2, cycling flow rate of 6000 L/h, concentration of copper ranging from 0.5 to 3 g/L. Removing the impurity from high-content copper electrolyte by cyclone electrowinning has advantages of reducing the loss of copper, avoiding the generation of AsH3 and achieving high removal rate.