中文摘要：

介绍了锌的常压富氧直接浸出新工艺及工艺中存在的主要问题。针对湖南株冶直浸系统中钙、镁结晶严重的问题,研究了结晶物的物相及温度对砷盐净化后溶液中钙离子、镁离子和锌离子质量浓度的影响。结果表明,直浸系统中,除镉一级溢流槽、除镉二级溢流槽和新液储罐中的结晶物主要成分为二水硫酸钙（CaSO4·2H2O）;净化后冷却塔中的结晶物除含有二水硫酸钙（CaSO4·2H2O）外,也含有碱式硫酸锌[ZnSO4·3Zn（OH）3·3H2O]和七水硫酸镁（7MgSO4·7H2O）;降温对净化后溶液中锌离子和镁离子质量浓度影响不明显,对钙离子浓度影响显著;温度降到42℃以下时,钙离子质量浓度从580mg/L降到460mg/L,钙析出量达0.12kg/m^3。

英文摘要：

The novel process for direct leaching of zinc from concentrate at atmospheric pressure and enriched-oxygen and the problems existed in the process are introduced.Aimed to the serious problem induced by crystallization of calcium-magnesium sulfate in the process in Zhuzhou Smelter,phase composition of the crystal substances and the influence of temperature on concentrations of Ca^2＋,Mg^2＋,Zn^2＋in zinc sulfate solution purified were studied.The results indicate that the crystal substances in the first and second overflow tank for removal of cadmium and fresh liquid tank are CaSO4·2H2O.Whereas the crystal substances in cooling tower after purification are CaSO4·2H2O,ZnSO4·3Zn（OH）3·3H2O and 7MgSO4 ·7H2O.Decreasing temperature does not remarkable influence the concentrations of Mg2＋and Zn^2＋in the leaching solution after purification by arsenate,but it significantly influences the concentration of Ca^2＋.The concentration of Ca2＋decreases from 580mg/L to 460mg/L when the temperature is lower than 42℃,and the precipitation quantity of calcium is 0.12kg/m^3.