离子膜电解法分离氯化浸出液中宏量铜镍

Separation of macro amounts copper from nickel in chloride leaching solution by anion membrane electrolysis

硫化镍矿中常伴有铜,在浸出时镍和铜往往同步进入浸出液,但由于铜镍化学性质相近而难以分离。针对这一难题,采用阴离子膜电解,通过控制槽电压,分离溶液中的铜镍,考察极距、电解液温度、槽电压、铜镍浓度等因素对铜镍分离效果的影响。结果表明:当溶液中Cu^(2+)25 g/L、Ni^(2+)37.5 g/L时,在极距4 cm、电解液温度40℃、槽电压0.53 V、电解10 h的条件下,阴极液中残余总铜浓度可降到0.24 g/L,ΡNi/Cu比为155.7,铜镍分离效果良好。

Nickel sulfide ore always accompanies by a large amount of copper, and copper can be often leached simultaneously into the nickel leaching solution. However, because of their similar chemical properties, it is difficult to separate. Here, anion exchange membrane electrolysis was provided to separate copper from solution by controlling the cell voltage. The effects of polar distance, electrolyte temperature, cell voltage and concentrations of copper and nickel on separation of copper-nickel were studied and the optimal operation conditions were obtained. The results show that, for solution containing 25 g/L Cu^2＋ and 37.5 g/L Ni^2＋,the total residual Cu concentration in catholyte is depressed to 0.24 g/L and the ratio of ΡNi/Cu reaches 155.7 under the optimal conditions of polar distance 4 cm, electrolyte temperature 40 ℃, cell voltage 0.53 V, electrolysis time 10 h. A satisfied effect of separation of copper from nickel is obtained.