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首页> 外文会议>Sixth International Conference on Environmental Issues and Management of Waste in Energy and Mineral Production Swemp 2000, May 30-Jun 2, 2000, Calgary, Alberta >Recovery of chromium from industrial wastes
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Recovery of chromium from industrial wastes

机译：从工业废料中回收铬

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Sodium chromate is produced via the soda ash roasting reaction of chromite ore with sodium carbonate. After the reaction, nearly 15 % of chromium oxide, remains unreacted and ends up in the waste stream for landfill. High purity chromium metal is produced via the aluminothermic reduction of Cr_2O_3. The slag generated contains around 8% of chromium oxide. The Cr_2O_3 exists in the residue either as a solid solution with α-Al_2O_3 or with γ-Fe_2O_3. The residue from the sodium chromate process and the slag from chromium metal production were analyzed both physically and chemically. The analytical scanning electron microscopic technique was used extensively for determining the mineral phase compositions. The kinetics of chromium extraction from the residue by using the soda ash roasting process under oxidizing atmosphere was investigated. The kinetics of leaching of Cr~(3+) ions via aqueous phase from spinel phase was also studied by treating the waste into acid solutions with different concentration.
机译：铬酸钠是通过铬铁矿矿石与碳酸钠的纯碱焙烧反应生产的。反应后，近15％的氧化铬仍未反应，最终进入废物掩埋场。通过铝热还原Cr_2O_3可以生产出高纯度的铬金属。产生的炉渣包含约8％的氧化铬。残余物中的Cr_2O_3与α-Al_2O_3或与γ-Fe_2O_3固溶在一起。物理和化学分析了铬酸钠工艺的残留物和铬金属生产的炉渣。分析型扫描电子显微镜技术被广泛用于确定矿物相组成。研究了在氧化气氛下采用纯碱焙烧工艺从残留物中提取铬的动力学。还通过将废物处理成不同浓度的酸性溶液，研究了从尖晶石相中通过水相浸出Cr〜（3+）离子的动力学。

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