高铁生物浸铜液中铜的回收

Copper Recovery from High-iron Copper Bioleaching Solution

在高铁生物浸铜液中通入H2S气体,生成硫化铜渣,双氧水-硫酸浸出硫化铜渣,得到硫酸铜溶液,后经蒸发浓缩、冷却结晶制得硫酸铜。研究结果表明:当生物浸出液pH=1,反应温度为30℃,反应时间为3 h时,在生物浸铜液中通入硫化氢,铜沉淀率接近100%;双氧水-硫酸浸出硫化铜渣,当双氧水与铜物质的量之比为6.4∶1,反应温度为50℃,液固比为15∶1,硫酸浓度为3 mol/L,反应时间为2 h时,铜浸出率为92.1%;所得浸出液中硫酸浓度为343.49 g/L,Cu2+浓度为25.33 g/L,通过蒸发浓缩、冷却结晶得到纯度为96%的硫酸铜,其质量达到工业用硫酸铜质量标准(GB437-93)。

Copper sulfide sediment was generated by introducing H2S gas into high iron copper bioleaching solution. Copper sulfate solution was obtained by leaching the copper sulfide sediment with hydrogen peroxide solution and sulphuric acid, then copper sulfate was made from the solution by evaporation concentration and cooling crystallization. Results showed that the precipitation rate of copper was close to 100% by adding HzS into the bioleaching solution when the pH value was 1, reaction temperature was 30 ℃ and reaction time was 3 h. The leaching rate of copper was 92.1% by leaching copper sulfide sediment with hydrogen peroxide and sulphuric acid when the hydrogen peroxide solution and copper molar ratio was 6.4： 1, the reaction temperature was 50 ℃, the liquid to solid ratio was 15： 1, the concentration of sulfuric acid was 3 mol/L and reaction time was 2 h. The obtained leaching liquor with the sulfuric acid concentration of 343.49 g/L and the Cu^2＋ concentration of 25.33 g/L was treated by evaporation concentration and cooling crystallization, then copper sulfate with a purity of 96% was obtained, which reached the national standard （GB437 -93 ） for industrial copper sulfate .