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铁矿石直接还原以生产电炉炼钢的原料,这种方法目前在世界上有重要的经济价值。为此,需要含二氧化硅小于2％的超纯铁精矿。半工业试验和工业生产表明,湿式强磁场磁选机能很好地满足这一要求,其回收率高,投资和经营费少。采用琼斯磁选机,已经从分级、重选或弱磁场磁选机所得到的预选精矿中分选出二氧化硅含量小于1.5％、回收率超过90％的超纯精矿。估计用湿式强磁场磁选机生产一吨超纯精矿所需要的总成本和经营费,对处理镜铁矿的螺旋选矿机精矿为0.43美元,对巴西赤铁矿粉为0.47美元,对磁铁矿精矿来说为0.49美元。
The direct reduction of iron ore to produce EAF raw materials is currently of major economic value in the world. For this purpose, ultra-pure iron concentrates containing less than 2% silica are required. Semi-industrial tests and industrial production show that wet magnetic field separators are well suited to meet this requirement with high recovery and low investment and operating costs. Using the Jones Magnetic Separator, ultra-pure concentrates of less than 1.5% silica and more than 90% silica have been sorted from preselected concentrates obtained by fractionation, reselection or field weakening. It is estimated that the total cost and operating costs required to produce one tonne of ultrapure concentrate with a wet magnetic field magnetic separator are 0.43 US $ for spiral concentrator concentrates and 0.47 US $ for Brazilian hematite concentrates Magnetite concentrate is 0.49 US dollars.