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以含有低熔点FeS2的硫酸渣和烟煤为原料,对硫酸渣含碳球团进行还原熔分,考察了碱度、焙烧温度、焙烧时间和C/O摩尔比对铁回收率的影响,确定了最佳工艺参数.在碱度R=1.0、焙烧温度1450℃、焙烧时间20 min以及配煤量C/O=1.2的条件下还原熔分硫酸渣,可以获得93.1%铁回收率的珠铁.对尾渣的X射线衍射分析可知,硫酸渣中铁氧化物及含铁硫化物被还原,铁回收率较高,且熔分时间短造成大量铁以金属态滞留于渣中;还原熔分硫酸渣所得珠铁因其较高硫含量,可用于冶炼硫系易切削钢.
The effect of basicity, calcination temperature, calcination time and C / O molar ratio on the iron recovery was investigated by using sulfuric acid slag and bituminous coal containing low melting point FeS2 as raw materials, The optimal technological parameters were as follows: the beads with 93.1% iron recovery could be obtained by reducing the sulfuric acid slag with alkalinity R = 1.0, calcination temperature 1450 ℃, calcination time 20 min and coal blending ration C / O = 1.2. X-ray diffraction analysis of the tailings shows that the iron oxides and iron sulfides in the sulfuric acid slag are reduced and the iron recovery rate is high, and a large amount of iron remains in the metal state in the slag due to the short melting time; The resulting beads because of its high sulfur content, sulfur can be used for smelting free cutting steel.