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为了实现赤泥资源高附加值化综合利用,通过高温模拟试验对赤泥含碳球团还原焙烧-熔分过程进行研究。将赤泥含碳球团在1 200℃下进行还原焙烧,并结合相图分析,向粉碎后的焙烧球团中添加一定比例的CaO、Al_2O_3进行调质和熔分。结果表明,赤泥含碳球团在1 200℃下还原12min后金属化率可达91.3%,还原效果良好;在1 450℃下进行还原熔分,可实现渣铁的有效分离,金属铁收得率可达到90%以上,所得铁水质量符合炼钢要求;熔分渣中w(TFe)可降至0.5%以下,渣中主要物相为12CaO·7Al_2O_3、CaTiO_3和2CaO·Al_2O_3·SiO_2,通过熔点性能测试试验,熔化性能符合钢液脱硫条件。
In order to realize the high value-added comprehensive utilization of red mud resources, the reduction roasting-melting process of red mud-containing carbon pellets was studied by high temperature simulation. The red mud carbonaceous pellets are reduced and roasted at 1 200 ℃, and combined with the phase diagram analysis, a certain proportion of CaO and Al 2 O 3 are added to the crushed pellets for tempering and melting. The results showed that the reduction rate of the red mud-bearing carbon pellets was 91.3% after being reduced at 1 200 ℃ for 12 min, and the reduction effect was good. The reduction and melting at 1 450 ℃ could effectively separate the slag and iron, The yield of hot metal can reach more than 90%. The quality of molten iron meets the requirements of steelmaking. The content of w (TFe) in slag can be reduced below 0.5%, and the main phases in slag are 12CaO · 7Al_2O_3, CaTiO_3 and 2CaO · Al_2O_3 · SiO_2 Melting point performance test, the melting performance of molten steel desulfurization conditions.