高铁赤泥水热钙化还原过程中铁相转化行为  

Iron phase transformation behavior during hydrothermal calcification reduction process of high-iron red mud

作　　者：田润雨 王兴建 王一雍[2] TIAN Runyu;WANG Xingjian;WANG Yiyong(School of International Education,Liaoning University of Science and Technology,Anshan 114051,China;School of Materials and Metallurgy,Liaoning University of Science and Technology,Anshan 114051,China)

机构地区：[1]辽宁科技大学国际教育学院,辽宁鞍山114051 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《辽宁科技大学学报》2024年第6期401-406,415,共7页Journal of University of Science and Technology Liaoning

基　　金：国家自然科学基金资助项目(U23A20610)。

摘　　要：赤泥是拜耳法生产氧化铝过程中产生的高污染强碱性废渣,存在严重的环境问题和安全隐患。但其中Al_(2)O_(3)和Fe_(2)O_(3)的含量高,是优质的铝、铁二次资源,具有很高的回收利用价值。本文采用生物质水热钙化还原法,以淀粉作为还原剂,在高温碱性水热条件下处理高铁赤泥。实验结果表明,转型渣中Na_(2)O质量分数由9.74%降至0.50%,Al_(2)O_(3)溶出率最高达到89.77%;大量碱和铝溶出促进Fe_(2)O_(3)富集,使其质量分数达到43.31%;转型渣中铁相由Fe_(2)O_(3)完全转化为Fe_(3)O_(4),饱和磁化强度达到26.04 kA/m,矫顽力降至223.15 G,磁性特征明显。Red mud is a highly polluting and alkaline waste residue generated during the Bayer process of producing alumina,which poses serious environmental problems and safety hazards.However,the content of Al_(2)O_(3) and Fe_(2)O_(3) is high,making them high-quality secondary resources of aluminum and iron with high recycling value.In this article,biomass hydrothermal calcification reduction method is used,with starch as a reducing agent,to treat high-iron red mud under high-temperature alkaline hydrothermal conditions.The results showed that the mass fraction of Na_(2)O in the transformation slag decreased from 9.74% to 0.50%,and the dissolution rates of Al_(2)O_(3) was up 89.77%.A large amount of alkali and aluminum dissolution promoted the enrichment of Fe_(2)O_(3) mass fraction to 43.31%.Under this condition,the transformation slag iron phase is complete transformed from Fe_(2)O_(3) to Fe_(3)O_(4),with a high saturation magnetization of 26.04 kA/m a low coercive force of 223.15 G,The magnetic characteristics are obvious.

关 键 词：高铁赤泥 还原 脱碱溶铝 磁选分离 

分 类 号：TF821[冶金工程—有色金属冶金]