转炉炉料配比对渣钢间锰分配比影响的试验研究

Study on the effect of converter charge ratio on manganese distribution ratio between slag and molten steel

采用转炉双渣脱磷、少渣冶炼的工艺进行锰矿直接合金化工艺。选取终点炉渣和钢水的样品进行化学成分和矿相检测,分析试验中不同锰矿、造渣料最佳配比对渣钢间锰分配比的影响。采用试验设计的炉料配比,得到的锰收得率为15.87%~79.3%,平均为45.05%;渣钢间锰分配比为21.97~37.96,平均为31.17;铁水脱磷率86%~92%,平均为88%。第9组、第4组和第13组的炉料配比得到的渣钢间锰分配比较低,在22~25。影响渣钢间锰分配比的主要因素是钢水温度、终点碳含量、炉渣碱度和氧化铁,得到了这些因素与渣钢间锰分配比之间的定量关系。获得低锰分配比的炉料配比是石灰比例为25%~30%,烧结矿比例为30%~40%,锰矿比例为15%~20%,轻烧白云石比例为20%~30%。

The direct alloying process of manganese ore was carried out by the process of double slag dephosphorization and less slag smelting.The samples of end-point slag and molten steel were selected for chemical composition and mineral phase detection,and the influence of the optimum ratio of different manganese ores and slag-making materials on the manganese distribution ratio between slag and steel was analyzed.The results show that the manganese yield is 15.87%-79.3%,with an average of 45.05%.The manganese distribution ratio between slag and steel is 21.97-37.96,with an average of 31.17.The dephosphorization rate is 86%-92%,with an average of 88%.The manganese distribution between slag and steel obtained by the charge ratio of group 9,group 4 and group 13 is relatively low,between 22-25.The main factors affecting the distribution ratio of manganese between slag and steel are molten steel temperature,end point carbon content,slag basicity and iron oxide.The quantitative relationship between these factors and the distribution ratio of manganese between slag and steel was obtained.The charge ratio of the low manganese distribution ratio is that the proportion of lime is 25%-30%,the proportion of sinter is 30%-40%,the proportion of manganese ore is 15%-20%,and the proportion of light burnt dolomite is 20%-30%.