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Innovative methodology for comprehensive utilization of iron ore tailings.pdf

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Innovative methodology for comprehensive utilization of iron ore tailings

I P a C a b c a A R R A A K I I M M 1 i o i t t t p b d b p t N c e t T f 0 dJournal of Hazardous Materials 174 (2010) 71–77 Contents lists available at ScienceDirect Journal of Hazardous Materials journa l homepage: www.e lsev ier .com/ locate / jhazmat nnovative methodology for comprehensive utilization of iron ore tailings art 1. The recovery of iron from iron ore tailings using magnetic separation fter magnetizing roasting hao Lia,?, Henghu Suna,b, Jing Baic, Longtu Lia State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China School of Engineering and Computer Science, University of the Pacific, Stockton, CA 95211, USA National Engineering Laboratory of Biohydrometallurgy, General Research Institute for Non-Ferrous Metals, Beijing 100088, China r t i c l e i n f o rticle history: eceived 29 May 2009 eceived in revised form 4 September 2009 a b s t r a c t Iron ore tailings have become one kind of the most hazardous solid waste. In order to recycle iron in the tailings, we present a technique using magnetizing roasting process followed by magnetic separation. After analysis of chemical composition and crystalline phase, according to experimental mechanism, theccepted 4 September 2009 vailable online 11 September 2009 eywords: ron ore tailings ron recovery effects of different parameters on recovery efficiency of iron were carried out. The optimum reaction parameters were proposed as the following: ratio of coal: iron ore tailings as 1:100, roasting at 800 ?C for 30min, and milling 15min of roasted samples. With these optimum parameters, the grade of magnetic concentrate was 61.3% Fe and recovery rate of 88.2%. With this method, a great amount of iron can be reused. In addition, the microstructure and phase transformation of the process of magnetizing roastingagnetizing roasting agnetic separation were studied. . Introduction With 30 years of reform and opening up, Chinese iron a