铜电解液含铋复盐沉淀法脱砷新工艺研究

针对目前诱导法脱砷产能不足、脱除率低的问题,开发了电解液含铋复盐沉淀法脱砷新工艺,优化沉淀条件为:含铋复盐沉淀剂用量Bi/As摩尔比1∶1、温度55℃、时间30 min,此时电解液中铜、砷、锑沉淀率分别为4.75%、63.62%和91.30%;在NaOH浓度50 g/L、液固比5∶1、温度80℃,时间0.5 h条件下,碱浸砷浸出率可达78.98%;沉淀剂再生性能良好,可循环使用;碱浸液经苛化再生循环利用,经过一次碱浸-苛化,NaOH损失率仅为2.7%。

Arsenic Removal from Copper Electrolyte by Precipitation with Complex Bismuth Salts as Precipitant

Aiming at the problems of insufficient production capacity and low removal rate of arsenic by induction method, a new precipitation process with the complex bismuth salts as the precipitant was developed for removing arsenic in electrolyte. It is shown that the precipitation rates of copper, arsenic and antimony in electrolyte are 4.75%, 63.62% and 91.30%, respectively, after the precipitation process proceeds at 55 ℃ for 30 min by adding this complex bismuth-containing precipitant with Bi/As in a molar ratio of 1∶1, and the alkali leaching process at 80 ℃ for 0.5 h with NaOH concentration of 50 g/L and liquid-solid ratio of 5∶1 can result in the leaching rate of arsenic up to 78.98%. The precipitant has a good regeneration performance and can be recycled. And the alkali leaching solution can also be recycled after causticization. After one cycle of alkali leaching and causticization, NaOH shows the loss rate of only 2.7%.