酒石酸盐浸出氧化锌烟尘提锌实验研究

Zinc Extraction from Zinc Oxide Dust by Tartrate

开展了酒石酸盐强化氧化锌烟尘回收锌工艺实验研究,分别考察了NH_(3)-H_(2)O、NH_(3)-(NH_(4))_(2)O_(6)C_(4)H_(4)-H_(2)O、NH_(3)-C4H6O6-H_(2)O、NH_(3)-C_(4)H_(8)Na_(2)O_(8)-H_(2)O及(NH_(4))_(2)O_(6)C_(4)H_(4)-H_(2)O体系对锌浸出率的影响。结果表明,NH_(3)-C4H6O6-H_(2)O体系浸出氧化锌烟尘效果较佳。进一步研究了NH_(3)-C4H6O6-H_(2)O体系下酒石酸浓度、浸出时间、搅拌速度等因素对锌浸出率的影响,研究结果表明:控制酒石酸浓度为0.7mol/L、氨水浓度为5mol/L、浸出时间为40min、搅拌速度400r/min、液固比为5∶1、浸出温度为25℃条件下,锌浸出率达到76.59%,其中酒石酸浓度、时间、搅拌速度、液固比对锌浸出率的影响显著;X射线衍射、红外光谱分析表明NH_(3)-C4H6O6-H_(2)O体系可实现ZnO的配位溶出,ZnS在酒石酸及酒石酸盐的氨性体系下难以溶出。

An experimental study was carried out on the extraction process of zinc oxide dust with tartarate.The effects of NH_(3)-H_(2)O、NH_(3)-(NH_(4))_(2)O_(6)C_(4)H_(4)-H_(2)O、NH_(3)-C4H6O6-H_(2)O、NH_(3)-C_(4)H_(8)Na_(2)O_(8)-H_(2)O and(NH_(4))_(2)O_(6)C_(4)H_(4)-H_(2)O systems on the zinc leaching rate were investigated,respectively.The results showed that the extraction effect of NH_(3)-C4H6O6-H_(2)O system was better.The influences of tartaric acid concentration,leaching time and stirring speed on the zinc leaching rate under the NH_(3)-C4H6O6-H_(2)O system were further studied.The results showed that the zinc leaching rate reached 76.59%under the condition:the concentration of tartaric acid was controlled at 0.7mol/L,the concentration of ammonia water was 5mol/L,the leaching time was 40min,the stirring speed was 400r/min,the liquid-solid ratio was 5∶1,and the leaching temperature was 25℃.The concentration of tartaric acid,time,stirring speed and the ratio of liquid to solid were significantly affected for the zinc leaching rate.X-ray diffraction(XRD)and FT-IR spectrum analysis showed that the coordination dissolution of ZnO could be realized in NH_(3)-C4H6 O6-H_(2)O system,and ZnS was difficult to be dissolved in the ammoniacal system of tartaric acid and tartarate.