氧化锌矿溶出液的净化

以中低品位氧化锌矿的硫酸铵焙烧熟料溶出液为原料,其中主要含有Zn SO4,Fe2(SO4)3及Al2(SO4)3,以碳酸氢铵为除杂剂,采用黄铵铁矾法和水解法去除溶液中的杂质Fe和Al以得到较为纯净的Zn SO4溶液,实验考察了溶液p H值、反应温度、反应时间对除铁率的影响,得到了黄铵铁矾渣,继续调节硫酸锌溶液的p H值以水解去除溶液中的Al,得到铝渣.采用XRD,SEM,化学成分分析等手段对黄铵铁矾渣、铝渣进行了表征,结果表明黄铵铁矾发育良好,颗粒规则,氢氧化铝粒度不均匀.

Purification of the Digestion Solution of Zinc Oxide Ores

ZnSO₄ solution was used as a raw material， which was obtained from zinc oxide ores roasted using (NH₄)₂SO₄ and then digested in water. The main components in solution were ZnSO₄， Fe₂(SO₄)₃， Al₂(SO₄)₃ and so on. NH₄HCO₃ was used as purifier reagent. Aiming to obtain refined ZnSO₄ solution， the ammonium jarosite method and hydrolysis method were adopted to eliminate Fe³⁺ and Al³⁺ from the solution. The influences of pH values， the reaction temperature and time on the iron removal rate were discussed， and after the removal of iron， the ammonium jarosite slags were obtained. The pH value of solution was adjusted to precipitate Al³⁺ and Al(OH)₃ was yielded out. The XRD， SEM and chemical components analysis were used to characterize the ammonium jarosite and Al(OH)₃ slags. The results showed that the ammonium jarosite particles with regular shape growes well， and the size of Al(OH)₃ slags is heterogeneous.