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Metal Mine ›› 2014, Vol. 43 ›› Issue (12): 61-65.

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Effects of Components of Reductants on Direct Reduction of High-phosphorus Oolitic Hematite

Xu Chengyan1,2,Sun Tichang1,2,Kou Jue1,2,Gao Enxia1,2,Cao Yunye1,2   

  1. 1.School of Civil and Environmental Engineering,Beijing University of Science and Technology,Beijing 100083,China;2.Key Laboratory of for High-Efficient Mining and Safety of Metal Mines,Ministry of Education,Beijing 100083,China
  • Online:2014-12-15 Published:2015-07-23

Abstract: With activated carbon,coke,anthracite 1,and lignite as reductants,and with the addition of mixed sodium salts dephosphorization agent,through the direct reduction roasting-grinding-low intensity magnetic separation process,the experiment of iron increase and phosphorus removal for high-phosphorus oolitic hematite from Western Hubei Province was carried out.It is found that three components of ash,fixed carbon and volatile content in different lead to the different effect of four kinds of reductants on the obtained direct reduction iron(DRI) indexes(iron grade,iron recovery,and phosphorus content).However,due to the influence of three components in reductants is intertwined together,it is difficult to summarize respectively the influence law of each component on DRI index.Therefore,other 6 kinds of reductants were introduced.Through the blending of different single reductants,and the blended reductants has only one component changed,the further research was conducted.The results indicated that the reductants with higher volatile are beneficial to increasing iron recovery,but not beneficial to iron grade and phosphorus content.The reductants with higher fixed carbon are beneficial to iron recovery,and have little effect on iron grade,but not favorable for phosphorus removal.The reductants with over high ash are not benefit to iron grade,iron recovery,and phosphorus content.The above research results provide valuable references to selecting suitable reductants for iron increase and phosphorus removal by direct reduction roasting and low intensity magnetic separation technology for high phosphorus oolitic hematite.

Key words: High-phosphorus oolitic hematite, Direct reduction roasting, Components of reductants, Direct reduction iron(DRI)indexes