铜电解精炼液净化脱砷新工艺

电解精炼铜过程中,粗铜中的砷不可避免地溶解到电解液中,进而影响精炼铜效率.由于铜精炼电解液是酸性体系,常用的萃取法和化学沉淀法很难在该环境中取得理想效果.现有电解精炼厂大多选用电沉积法,以牺牲电耗的方式降低电解液中的砷浓度,然而这种方式能耗大、沉积效率低.通过模拟现有电沉积脱砷工艺,发现当铜电解精炼液中铜浓度降至10 ...

New Process for Purifying Arsenic Removal from Copper Electrorefining Liquid

Arsenic in crude copper is inevitably dissolved in the electrolyte during the process of electrolytic refining copper, which will affect the efficiency of refining copper. Commonly methods, such as extraction and chemical precipitation, were difficult to achieve ideal results in acid copper refining system. Electrodeposition was used mostly in the existing electrolytic refineries. In this process, the concentration of arsenic was reduced by the power consumption. However, the high energy comsumes and low efficiency limit its application. In this work, the deposit of arsenic was fast in 10 g/L copper electrolyte is found by simulating the existing electrodeposition dearsenic process. Combining the characteristics of the existing electrolytic copper refinery, the arsenic removal process is modified to achieve efficient arsenic removal. More importantly, the product is in the form of copper-arsenic alloy which can be sold to balance the cost. Compared with the existing process, the modified process only adds electrolyte adjustment storage tanks between different sections. The rapid electrodeposition removal of arsenic was achieved by balancing the concentration of copper ions in each section electrolyte. Furthermore, the modified process reduces the power consumption and time for arsenic removal. In addition, the content of copper in the electrodeposit product can be as high as about 60%, which is high-quality blister copper.