Preparation of Chromium-iron Metal Powder from Chromium Slag by Reduction Roasting and Magnetic Separation

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• 作者：Hong-ming LONG ^{yaflhm@126.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Qing-min MENG ; Ping WANG ; Tie-jun CHUN ; ^{springcsu@126.com" class="auth_mail" title="E-mail the corresponding author} ; Yong-lin YAO
• 关键词：chromium slag ; reduction roasting ; magnetic separation ; chromium-iron metal powder
• 刊名：Journal of Iron and Steel Research, International
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：22
• 期：9
• 页码：771-776
• 全文大小：1487 K

文摘

Chromium slag (CS) has become one of the most hazardous solid waste containing chromium and iron. Based on its characteristics, the technology of reduction roasting and magnetic separation was employed to treat CS. The major impurity element of CS is magnesium and it exists in magnesium ferrite phase, which is hard to recover iron in the absence of additives. During reduction roasting, additives (Al₂O₃) and CaF₂) could destroy the structure of magnesium ferrite and improve the iron grade and recovery. The final product, i. e. chromium-iron powder, contains 72.54% Fe and 13.56% Cr, with the iron recovery of 80.34% and chromium recovery of 80. 70%.