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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)。
H2S gas is introduced into the biological leaching copper liquid of the high-speed rail to generate copper sulphide slag, and the hydrogen sulphide leaches out the copper sulphate slag to obtain the copper sulphate solution, and is then concentrated by evaporation and crystallized to obtain copper sulphate. The results showed that when the biological leachate pH = 1, the reaction temperature was 30 ℃, the reaction time was 3 h, hydrogen sulfide was introduced into the biological copper immersion liquid, the copper deposition rate was close to 100%; the hydrogen sulphide leaching copper sulfide slag, When the ratio of hydrogen peroxide to copper was 6.4:1, the reaction temperature was 50 ℃, the liquid / solid ratio was 15:1, the concentration of sulfuric acid was 3 mol / L and the reaction time was 2 h, the leaching rate of copper was 92.1%. The concentration of sulfuric acid in the leachate was 343.49 g / L and the concentration of Cu2 + was 25.33 g / L. The obtained copper sulfate was crystallized by evaporation and crystallized to obtain 96% pure copper sulfate. The mass reached the quality standard for industrial copper sulfate (GB437-93).