Preparation of High Quality Magnetite Concentratefrom Pyrite Cinder by Composite Pellet Reduction-roasting and Magnetic-separation
Domestic production of pyrite cinder reached 15.95 million tons in 2006.The pyrite cinder used in cement industry accounts for about 30% production.The remaining 70%,11.17 million tons,was thrown away as waste,which brought serious environmental and resource problems.A new technology of composite pellet reduction-roasting and magnetic-separation (CPRM) has been developed to utilize pyrite cinder.Pyrite cinder sample,containing 45.56% Fe,0.19% Cu and 1.45% S,was pelletized with addition of 5% composite agent in bailing disc.Green balls after drying were reduced at 700～800 ℃ for 20min with 300kg/t pulverized coal injection in rotary kiln.After two stages of ball-grinding and four stages of magnetic separation,high grade magnetite concentrate with 66.23% Fe was produced,meanwhile impurities Cu and S was decreased to 0.048% and 0.053%,respectively.And iron recovery of 73.32%,desulphurization of 96.34% and decoppering degree of 74.73% were achieved.Key technique is that composite agent can accelerate reduction of Fe2O3 and transfer copper and sulphur into water-soluble inorganic salts,which can be removed during wet magnetic concentration.This new technology can be used to fully utilize pyrite cinder and produce high quality magnetite concentrates as feed for steel industry,which will help tackle the pollution problem of pyrite cinder and extend iron-bearing raw material sourcing for Chinese steel industry.
Pyrite cinder Composite pellet Reduction roasting Magnetic-separation
J.Li S.A.Xiong D.Q.Zhu Z.Y.Li
School of Resource Processing and Bioengineering,Central South University,Changsha,China.Research In Daye Iron Mine of Wuhan Mining Company,Huangshi,China School of Resource Processing and Bioengineering,Central South University,Changsha,China Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai,China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3793-3799
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）