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›› 2006, Vol. 6 ›› Issue (1): 55-58.

• 过程与工艺 • 上一篇    下一篇

酸浸-生物法处理铬渣

戴昊波,曹宏斌,李玉平,张懿   

  1. 中国科学院过程工程研究所
  • 出版日期:2006-02-20 发布日期:2006-02-20

Acid Leaching and Bio-reduction of Chromite Ore Processing Residue

DAI Hao-bo,CAO Hong-bin,LI Yu-ping,ZHANG Yi   

  1. Institute of Processing Engineering ，CAS， Beijing
  • Online:2006-02-20 Published:2006-02-20

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摘要： 采用酸浸-生物法处理铬渣以进行有效的还原解毒. 首先分析了铬渣的物相和组成，然后鼓入CO2进行酸浸，再结合硫酸盐还原菌浸取和还原. 结果表明，经过生物反应36 h后，残渣中水溶性六价铬含量降到了2 mg/kg，达到了铬盐工业污染物排放标准GB4280-84的要求.

关键词: 铬渣, 酸浸, 二氧化碳, 硫酸盐还原菌, 生物还原

Abstract: Chromite ore processing residue (COPR) is a kind of solid waste in the production of chromate by roasting with lime. There exists tremendous threat to environment owing to the oxidation of Cr(VI). In this work, a treatment scheme was developed using sulfate-reducing bacteria (SRB) as bio-reducing agent after HCl or CO2 was used to acidify the COPR to neutral state. The results showed that the leaching of water combined with CO2 blowing could gain an advantage over HCl leaching. Then SRB and substrates were added to the solid-liquid mixture after the acidifying for bio-reduction. It was found that water soluble Cr(VI) was lowered to 2 mg/kg of waste after 36 h treatment, which is below the GB4280-84 limit of 5 mg/kg.

Key words: chromite ore processing residue, acid leaching, carbon dioxide, sulfate reducing bacteria, bio-reduction