拜耳法赤泥中铁的强磁选预富集—深度还原—弱磁选试验

金属矿山 ›› 2016, Vol. 45 ›› Issue (01): 64-68.

拜耳法赤泥中铁的强磁选预富集—深度还原—弱磁选试验

王健月^1,2，崔卫华³，张以河⁴，倪文^1,2，刘轩^1,2

1.北京科技大学土木与环境工程学院，北京100083；2.工业典型污染物资源化处理北京市重点实验室，北京 100083；3.中国地质大学（北京）水资源与环境学院，北京100083；4.中国地质大学（北京）材料科学与工程学院，北京 100083

出版日期:2016-01-15 发布日期:2016-03-11
基金资助:
* 国家高技术研究发展计划（863计划）项目（编号:2012AA06A109）。

Iron Recovering from Bayer Process Red Mud with High Intensity Magnetic Pre-concentration-Deep Reduction-Low Intensity Magnetic Separation Method

Wang Jianyue^1,2，Cui Weihua³，Zhang Yihe⁴，Ni Wen^1,2，Liu Xuan^1,2

1.School of Civil and Environmental Engineering，University of Science and Technology Beijing，Beijing 100083，China；2.Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutant，Beijing 100083，China；3.School of Water Resources & Environment,China University of Geosciences (Beijing)，Beijing 100083，China；4.Faculty of Materials Science and Chemistry,China University of Geosciences (Beijing)，Beijing 100083，China

Online:2016-01-15 Published:2016-03-11

摘要/Abstract

摘要： 拜耳法生产Al₂O₃过程中产生的赤泥中含有大量的难回收铁矿物，有效地回收这些铁矿物既是对资源的高效利用，又有利于减少污染物排放。采用强磁选预富集—深度还原—弱磁选工艺对铁品位为39.42%的山东某拜尔法赤泥进行了选铁试验。结果表明：在磨矿细度为-0.074 mm 占80.75%，强磁选背景磁感应场强为1.2 T情况下，可获得铁品位为52.89%、铁回收率为59.85%的强磁选预富集精矿；强磁选预富集精矿在烟煤用量为24.27%（烟煤与强磁选预富集精矿的质量比），深度还原温度为1 300 ℃、时间为45 min，还原焙烧产物磨矿细度为-0.074 mm占38%，弱磁选磁场强度为72.03 kA/m情况下，可得到铁品位为91.25%，铁作业回收率为96.90%、对赤泥回收率为57.99%的金属铁粉，较好地实现了赤泥中铁矿物的回收。试验确定的工艺简单、稳定、可靠，有较高的工业应用价值。

关键词: 拜耳法赤泥, 强磁选预富集, 深度还原, 弱磁选, 金属铁粉

Abstract: There are large amount of refractory iron minerals in red mud produced in the production of Al₂O₃ by Bayer Process.Efficiently recovering these iron minerals not only better recover the resources but also is beneficial to reduce the pollutant emissions.High-intensity magnetic pre-concentration-deep reduction-low-intensity magnetic separation process was conducted on the Bayer Process red mud(39.42% Fe) from Shandong.The results indicated that the high intensity pre-concentration concentrate with iron grade of 52.89% and recovery of 59.85% was obtained with grinding fitness of 80.75% -0.074 mm and background field intensity at 1.2 T；With bituminite dosage of 24.27% (mass ratio of bituminite to high intensity pre-concentration concentrate)，reduction temperature 1 300 ℃ for 45 min，reduction product grinding fineness of 38% -0.074 mm and low intensity magnetic field intensity at 72.03 kA/m，the iron powder with iron grade of 91.25% and magnetic separation recovery of 96.90% (General iron recovery of red mud was 57.99%) was obtained.The experimental defined process was simple，stable and reliable and had high industrial application values.

Key words: Bayer process red mud, High-intensity magnetic pre-concentration, Deep reduction, Low-intensity magnetic separation, Iron powder

王健月, 崔卫华, 张以河, 倪文, 刘轩. 拜耳法赤泥中铁的强磁选预富集—深度还原—弱磁选试验[J]. 金属矿山, 2016, 45(01): 64-68.

WANG Jian-Yue, CUI Wei-Hua, ZHANG Yi-He, NI Wen, LIU Xuan. Iron Recovering from Bayer Process Red Mud with High Intensity Magnetic Pre-concentration-Deep Reduction-Low Intensity Magnetic Separation Method[J]. Metal Mine, 2016, 45(01): 64-68.

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