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Studies on Environmentally Friendly Leaching Processes in China

CHEN Jiayong; ZHANG Yi; LU Keyuan; GONG Qian; ZHU Guocai   

  1. Institute of Chemical Metallurgy, Chinese Academy of Sciences CAS, Beijing
    100080, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2001-03-28 Published:2001-03-28
  • Contact: CHEN Jiayong

中国在环境友好浸取过程方面的一些研究

陈家镛; 张懿; 陆克源; 龚乾; 朱国才

  

  1. Institute of Chemical Metallurgy, Chinese Academy of Sciences CAS, Beijing
    100080, China
  • 通讯作者: 陈家镛

Abstract: The newly developed green leaching processes for chromium, lead and gold
extraction from ores or concentrates are described. The chromium is extracted from the iron
chromite ore with fused sodium hydroxide at 500-550°C as sodium chromate. The galena in
lead sulfide concentrate is converted into lead carbonate in ammonium or sodium carbonate
solution at 50-80°C followed by the separation of lead carbonate formed from the
unconverted sulfide ores by flotation. Gold associated with sulfide ore (such as pyrite and
chalcopyrite) can be extracted into sodium thiosulfate solution without any pretreatment
such as roasting, high pressure aqueous oxidation or bacteria pre-leaching.

Key words: iron chromite ore, lead sulfide ore, gold associated with sulfides, leaching, pretreatment, fused sodium

摘要: The newly developed green leaching processes for chromium, lead and gold
extraction from ores or concentrates are described. The chromium is extracted from the iron
chromite ore with fused sodium hydroxide at 500-550°C as sodium chromate. The galena in
lead sulfide concentrate is converted into lead carbonate in ammonium or sodium carbonate
solution at 50-80°C followed by the separation of lead carbonate formed from the
unconverted sulfide ores by flotation. Gold associated with sulfide ore (such as pyrite and
chalcopyrite) can be extracted into sodium thiosulfate solution without any pretreatment
such as roasting, high pressure aqueous oxidation or bacteria pre-leaching.

关键词: iron chromite ore;lead sulfide ore;gold associated with sulfides;leaching;pretreatment; fused sodium;hydroxide leaching;carbonate conversion of lead sulfide, carbonate conversion of lead sulfide