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 −20 µm in iron ore concentrate favoured the granulation and the productivity in conventional sintering, but the portion of +45 µm 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.