摘要:
以钒钛磁铁精矿和煤粉为原料,聚乙烯醇为黏结剂,采用正交试验和单因素试验研究水分含量、黏结剂加入量、成型压力、矿煤质量比对钒钛铁精矿含碳球团直接还原金属化率的影响,并对其影响规律进行了分析。结果 表明:影响含碳球团金属化率的主次因素依次为水分含量、成型压力、矿煤质量比、黏结剂加入量;金属化率优化后的工艺条件为水分含量9%,成型压力12 MPa,矿煤质量比100:22,黏结剂加入量0.4%,还原温度1 350℃,还原时间30 min。在此条件下含碳球团的还原效果较好,金属化率达到92.97%。
Abstract:
By taking polyvinyl alcohol as binding agent and vanadium-bearing titaniferous magnetite concentrate and pulverized coal as raw materials,the influences of moisture,moulding pressure,the mass ratio of ore to coal and the amount of binding agent added on the metallization ratio of the pellets during direct reduction were studied through a series of orthogonal experiments and single factor experiments,and their influencing rules were analyzed.The results show that the affecting factors in order of descreasing importance are moisture,moulding pressure,the mass ratio of ore to coal and the amount of binding agent added.The optimized process parameters obtained are 9% of moisture,12 MPa of moulding pressure,100:22 of the mass ratio of ore to coal,0.4% of the amount of binding agent added,1 350℃ of temperature and 30min of reduction time.Under these conditions,the metallization ratio of the pellets can be up to 92.97%.
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