高铁三水铝石型铝土矿的烧结特性

以Al2O3含量为26.35%,总Fe含量为31.22%,铝硅比为3.17的某高铁三水铝石型铝土矿为原料,研究了碱度、焦粉用量、混合料水分等对烧结矿质量指标的影响。结果表明:烧结矿碱度增加时,其转鼓强度和成品率下降,烧结矿自粉化程度加重;焦粉用量增加时,烧结矿转鼓强度和成品率提高;当混合料水分为9.0%、焦粉用量为8.0%、烧结矿碱度为4时,烧结矿转鼓强度为69.1%,成品率为81.2%,垂直烧结速度为30 mm/min,利用系数为1.2 t/(h.m2);烧结矿碱度为4时,样品存放2天粉化率为5%,烧结矿平均粒度由22.2 mm减小到21.9 mm,延长存放时间,烧结矿自粉化率增大,平均粒度显著减小。该烧结矿的冶金性能能基本满足高炉冶炼的要求。

Sintering properties of high iron gibbsite-type bauxite ores

The influences of basicity,coke dosage and moisture on sintering performance were studied respectively by using a sample with 26.35% Al2O3,31.22% Fet,and mass ratio of alumina to silica 3.17.The results show that the tumbling index and finished products efficiency increase with increasing coke dosage,while decrease with increasing basicity.Sinter spontaneous pulverization becomes severer as basicity increases.The tumbling index is 69.1%,finished products efficiency is 81.2%,sintering speed is 30 mm/min and productivity is 1.2 t/(h.m2) under the conditions of moisture of 9.0%,coke dosage of 8.0% and basicity of 4.After being stored for 2 d,the spontaneous pulverization of the sinter reaches 5% and the average particle size decreases from 22.2 mm to 21.9 mm.The sinters spontaneous pulverization increases while the average particle size of sinters decreases with prolonging storage time.The metallurgical performance of sinters can meet the requirement of BF smelting.