浸出-电沉积法从多金属低品位矿制备铜粉的研究

文章采用浸出-电沉积方法研究了多金属低品位氧化矿提取金属铜的工艺。探讨了工艺中温度、浸出时间、液固比（L／S）、硫酸浓度、矿样粒度、氧化剂等对铜的浸出率的影响。在硫酸浓度为10％，浸出时间控制在5h，液固比取5：1，浸出温度为95℃，粒度0．125mm以下占40％的最优条件下，得到铜的浸出率为82．2％。采用控制阴极电势电积法直接处理硫酸浸出液，在控制阴极电位小于500mV，铜离子的浓度为1～2g／L，H2S04为180g／L的条件下，得到铜含量在99％以上的优质海绵铜。

Technology of Preparation for Sponge Copper Powder by Leaching-Electrowinning from the Complex Multi-metal and Low Metal Grade Ores

It was adopted that the Leaching-Electrowinning Process to extract copper from multi-metal and low metal grade ores in this research project. It was studied intensively that effects of leaching temperature, leaching time,liquid-solid ratio,the concentration of sulphuric acid, sample granularity and the addition of oxidant in sul- phuric acid leaching on the leaching rate. The results showed that the leaching rate of copper arrived to 82.2% at the optimized conditions（temperature at 95 degree, time 5 h, phase ratio 5： 1,10% H2SO4, and sample size with 40% - below 120 mesh）. Disposal the sulphuric acid leaching solution by electrowinning of controlling cathodic potential was studied. Sponge copper powder which contains 99% Cu was obtained from leaching solution directly at the following conditions：cathodic voltage below 500 mV,concentration of Cu2＋ is 1 - 2 g/L and H2SO4 180 g/L.