Recovery of iron and calcium aluminate slag from high-ferrous bauxite by high-temperature reduction and smelting process

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• 作者：Ying-yi Zhang ; Wei Lü ; Yuan-hong Qi…
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：23
• 期：8
• 页码：881-890
• 全文大小：3,243 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X
• 卷排序：23

文摘

A high-temperature reduction and smelting process was used to recover iron and calcium aluminate slag from high-ferrous bauxite. The effects of w(CaO)/w(SiO₂) ratio, anthracite ratio, and reduction temperature and time on the recovery and size of iron nuggets and on the Al₂O₃ grade of the calcium aluminate slag were investigated through thermodynamic calculations and experiments. The optimized process conditions were the bauxite/anthracite/slaked lime weight ratio of 100:16.17:59.37, reduction temperature of 1450°C and reduction time of 20 min. Under these conditions, high-quality iron nuggets and calcium aluminate slag were obtained. The largest size and the highest recovery rate of iron nuggets were 11.42 mm and 92.79wt%, respectively. The calcium aluminate slag mainly comprised Ca₂SiO₄ and Ca₁₂Al₁₄O₃₃, with small amounts of FeAl₂O₄, CaAl₂O₄, and Ca₂Al₂SiO₇.Keywordsbauxitereductionsmeltingrecovery ratecalcium aluminateslag