从低浓度硫钴精矿浸出液中萃取分离铜钴试验研究

Extraction and Separation of Cu and Co from Low Concentration Cobalt Sulfide Concentrate Leaching Solution

研究了采用P204+磺化煤油体系从除杂后的低浓度硫钴精矿浸出液中萃取分离铜、钴,考察了萃原液pH、萃取剂浓度、萃取相比、萃取时间、反萃取剂浓度、反萃取相比等对铜钴分离效果的影响。结果表明:在萃原液pH=4、P204体积分数25%、萃取相比V_(O)/V_(A)=1/1、萃取时间3min、反萃取剂硫酸浓度0.10mol/L、反萃取相比V_(O)/V_(A)=2/1条件下,对硫钴精矿除杂后液进行两级逆流萃取、四级逆流反萃取试验,萃余液中钴质量浓度为338.80mg/L,铜质量浓度为2.96mg/L,铜萃取率为98.32%,90.03%的钴留在萃余液中,经反萃取铜钴可得到进一步分离,有利于下一步制备高纯度硫酸钴。

P204 was used to extract copper and cobalt from low concentration cobalt sulphide concentrate leaching solution.The effects of pH of extraction solution,extractor concentration,extraction ratio and time on the extraction efficiency were investigated.The results show that under the conditions of pH=4,P204 volume fraction of 25%,extraction ratio V_(O)/V_(A)=1/1,extraction time of 3 min,reverse extractant sulfuric acid concentration of 0.10 mol/L,and reverse extraction ratio V_(O)/V_(A)=2/1,the test of two-stage countercurrent extraction,four-stage countercurrent stripping is carried out on the purified liquid of cobalt sulfide concentrate,the mass concentration of cobalt and copper in the raffinate is 338.80 mg/L and 2.96 mg/L,the extraction rate of copper is 98.32%,and 90.03% of cobalt remains in the water phase.Copper and cobalt can be effectively further separated by stripping,which is conducive to preparation of high purity cobalt sulfate.