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›› 2010, Vol. 10 ›› Issue (5): 879-88.

• 反应与分离 • 上一篇    下一篇

Deep Purification of Zinc Ammoniacal Leaching Solution

李建 陈启元 胡慧萍 王为振   

  1. 中南大学化学化工学院冶金及应用物理化学研究所 中南大学化学化工学院冶金及应用物理化学研究所 中南大学化学化工学院 中南大学化学化工学院
  • 收稿日期:2010-08-10 修回日期:2010-09-17 出版日期:2010-10-20 发布日期:2010-10-20
  • 通讯作者: 李建

Deep Purification of Zinc Ammoniacal Leaching Solution

LI Jian CHEN Qi-yuan HU Hui-ping WANG Wei-zhen   

  1. Institute of Metallurgical and Applied Physico-Chemistry, School of Chemistry and Chemical Engineering, Central South University College of Chemistry and Chemical Engineering, Central South University College of Chemistry and Chemical Engineering, Central South University College of Chemistry and Chemical Engineering, Central South University
  • Received:2010-08-10 Revised:2010-09-17 Online:2010-10-20 Published:2010-10-20
  • Contact: LI Jian

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摘要： Deep purification of zinc ammoniacal leaching solution by cementation using zinc dust was studied. The effects of relative amount of metallic impurities, dosage of zinc dust, purification time, temperature, pH value and total ammonia concentration in the solution on the purification of the solution were investigated. The results indicate that total ammonia concentration in the solution had no effect on the purification, but relative amount of metallic impurities, dosage of zinc dust, purification time, temperature and pH value of the solution were the main factors influencing the purification. Keeping appropriate molar ratio of copper to cadmium or nickel to cadmium was beneficial to the cementation of cadmium. Nevertheless, the presence of cobalt went against the cementation of cadmium and cobalt. All metallic impurities could be decreased to acceptable levels under the optimized conditions of 2 g/L of zinc dust dosage, 1 h of purification time, 35℃, pH value 9.03 of zinc ammoniacal leaching solution. The deeply purified zinc ammoniacal solution obtained by one-stage purification meets the requirements of zinc electrowinning.

关键词: zinc ammoniacal leaching solution, zinc dust, deep purification, relative amount of metallic impurities

Abstract: Deep purification of zinc ammoniacal leaching solution by cementation using zinc dust was studied. The effects of relative amount of metallic impurities, dosage of zinc dust, purification time, temperature, pH value and total ammonia concentration in the solution on the purification of the solution were investigated. The results indicate that total ammonia concentration in the solution had no effect on the purification, but relative amount of metallic impurities, dosage of zinc dust, purification time, temperature and pH value of the solution were the main factors influencing the purification. Keeping appropriate molar ratio of copper to cadmium or nickel to cadmium was beneficial to the cementation of cadmium. Nevertheless, the presence of cobalt went against the cementation of cadmium and cobalt. All metallic impurities could be decreased to acceptable levels under the optimized conditions of 2 g/L of zinc dust dosage, 1 h of purification time, 35℃, pH value 9.03 of zinc ammoniacal leaching solution. The deeply purified zinc ammoniacal solution obtained by one-stage purification meets the requirements of zinc electrowinning.

Key words: zinc ammoniacal leaching solution, zinc dust, deep purification, relative amount of metallic impurities

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