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铁矿石常常含有辉石、角闪石、橄榄石、石榴石、绿帘石、绿泥石、蛇纹石、高岭石等含铁硅酸盐矿物.高炉富矿如含这些矿物,由于它们的熔点较低,往往在矿石冶炼过程中未充分加热和还原时就已熔融,并向炉缸下沉.所以,这些矿物不但不能产生更多的生铁,而且会大幅度降低炉缸温度,对炉况造成不良影响.贫矿中如有这些矿物,它们又多在一般机械选矿流程中随尾砂流失,不能成为精矿中铁的组成部分.所以,不论是富铁矿还是贫铁矿,只要硅酸铁的含量大于3%,就须要根据这一含量的高低相应地提高铁的品位指标,或从铁的品位中剔除硅酸铁的含量.
Iron ores often contain pyroxene, amphibole, olivine, garnet, epidote, chlorite, serpentine, kaolinite, etc. Iron-rich silicate minerals, such as those containing these minerals, Of the melting point is low, often in the ore smelting process did not fully heated and reduced when they have melted and sink to the hearth.So, these minerals not only can not produce more pig iron, and will greatly reduce the hearth temperature, If these minerals are present in poor lean mines, they are often lost in the normal mechanical beneficiation process as tailings sand and can not become part of the iron in the concentrate, so whether it is iron-rich or iron-poor, If the content of iron silicate is more than 3%, the grade of iron should be increased according to the content of iron or the content of iron silicate should be removed from the grade of iron.