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中南大学学报(自然科学版)

Journal of Central South University

第34卷    第6期    总第154期    2003年12月

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文章编号:1005-9792(2003)06-0619-05
氨法处理氧化锌矿制取电锌
张保平,唐谟堂,杨声海

(中南大学冶金科学与工程学院,湖南长沙,410083)

摘 要: 研究了用氯化铵法直接从氧化锌矿提取电锌的新工艺.该工艺采用氯化铵-氨水溶液作浸出剂,氧化锌矿中的锌以锌氨配合物形式进入浸出液,在浸出锌的同时将杂质砷、锑、铁等除去.研究结果表明:氨溶锌浸出率≥93%;浸液中的As和Sb的质量浓度都低于0.25 mg/L,Fe的质量浓度低于0.15 mg/L,其他杂质质量浓度低;浸出液经锌粉1次净化除杂后进行电积制取电锌.电锌中Zn的质量分数达99.999%,杂质含量极低,其中Fe的质量分数仅为0.000 05%;电流效率高达96.35%,直流电耗为2 502 kW·h;电解废液经补氨后返回浸取.

 

关键字: 锌氨配合物;浸出;净化;电积

Treating zinc oxide ores using ammonia-ammonium
chloride to produce electrolysis zinc
ZHANG Bao-ping,TANGMo-tang, YANG Sheng-hai

College of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:A new process of producing zinc fromzinc oxide ores in the system of NH4Cl-NH3-H2O was introduced . In the process, NH4Cl-NH3-H2O was used as leaching agent, the Zn(NH3) i2+ was formed when the solution was reacted with zinc oxide ores, the rate of zinc that could be dissolved in the solution was more than 93%, while the content of both As and Sb were lower than 0.25 mg/L, the content of Fe was lower than 0.15 mg/L, and there were little other impurities in the solution. The leached solution was purified with zinc powder, and then electrolyzed to produce electrolysis zinc.The production had good quality,w(Zn)>99.999%, and the content of the impurities were very low, extraordinarily w(Fe)<1.0×10-6; the current efficiency was 96.35% while the energy requirement was 2 505 kW·h. Ammonia is added into the solution, which would be recycled as leaching solution again.

 

Key words: zinc ammonium; coordinate complex salt; leach; purify; electrolysis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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