Effect of iron ore concentrate on sintering properties

Abstract

According to sinter pot experiments, with increases in coarser commercial concentrates (mean size 0.1-0.3 mm) in iron ore blends, the productivity of sinter decreased 5-7% for each 10 mass% concentrate increased. With increases in finer commercial concentrates (mean size 0.02 mm) of 10-30 mass%, the productivity did not alter significantly. With an increase in 10-20 mass% micro-particle concentrate (mean size 0.01 mm) pulverized from the coarser commercial concentrate, the productivity increased 3-11%. The portion of -20μm in iron ore concentrate favoured the granulation and the productivity in conventional sintering, but the portion of +45 -m had the reverse effects. With increases in finer commercial concentrates (10-40 mass%) combined with low grade ore (10-20 mass%) in iron ore blends, the productivity also did not obviously change. Compared with conventional sintering process, using the intensive mixer in an intensive mixing process or a separate granulation process could improve the productivity of sinter around 2 or 3% respectively.