Research and Practice on Old Tailings Reutilization
Experiment results and operation practice on reutilizing old tailings dumped at SCIM (Shangchang Iron Mine) of KISCO (Kunming Iron and Steel Corp.) are presented.In a production period over 30 years SCIM dumped about 8 million tons of iron ore tailings.For improving resources utilization instead of wasting,experiments on processing for reutilization of the old tailings are conducted.These tailings are fine size fractions of weathered iluvial ores rejected out by classificationdesliming in ore washing and dressing processes,containing TFe 21%～22% in hematite mainly and limonite occasionally.Their particle size distribution,in average,is of 72.26% minus 0.037mm and 30.88% minus 0.005mm.Existence of plenty of micro-fine particles makes the tailings refractory to process,resulting in poor metallurgy.The whole sample of the old tailings without size-classification is fed into experimental process.Slon-100 type high grads WHIMS (wet high intensity magnetic separator) with eye-pulsing is adopted,which magnetism-focusing rods diameter is changed from 3mm into 2mm.Operational conditions of optimizing rougher separation tests are strengthened.An iron concentrate assaying 52.21% Fe at quantity rate of 18.39% and iron recovery of 44.40% is obtained.Operational practice shows that metallurgy and economy of the old railings treatment are close to what achieved at experiments.It is estimated,therefore,that some 1.4 million tons of this iron concentrate may be recovered from the old tailings.This means that KISCO has moved its key one-step in re-mining and reutilizing the secondary resources,which would be a good demonstration in this industry.This is also of social and economic significance in response to China governments request on reducing consumption of resources and establishing society with economy for achieving sustainable development.
Shangchang Iron Mine Ore tailings reutilization
Y.P.Huang Z.Q.Zhao X.Z.Li M.C.Yang
Kunming Metallurgy Research Institute,Kunming,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
3965-3970
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）