煤基处理硫酸渣制备含硫钢原料的实验研究

Experimental study on the coal-based method to deal with pyrite cinder for preparing sulfur-bearing steel

  • 摘要: 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.

     

    Abstract: Using pyrite cinder with low melting point and bituminous coal as raw materials,carbonized pyrite cinder pellets were made and introduced to the reduction smelting process. The effects of basicity,roasting temperature,roasting time and C/O molar ratio on the iron recovery rate were investigated to search the optimum experimental parameters. It was found that iron nuggets with the iron recovery of 93.1% were obtained when the basicity was 1.2,the roasting temperature was 1450℃,the roasting time was 20 min and the C/O molar ratio was 1.2. Iron oxides and iron-bearing sulfides in pyrite cinder were reduced,thus a higher iron recovery rate was achieved. From X-ray diffraction analysis on the slag tailings,short smelting time caused high amount of iron in metallic state retained in the slag. Because of high sulfur in iron nuggets from pyrite cinder by reduction and melting separation,the iron nuggets can be used as raw materials to product sulfur-bearing free-cutting steel.

     

/

返回文章
返回