Discussion on the practice of adopting the re-grinding and re-processing technology in dealing with the local iron ore concentrate

With the growth of the steel product, in addition to the locally produced iron ore concentrate, Baogang also uses the out-purchased iron ore concentrate as an addition. The out-purchased iron ore concentrates are from many different places, so both the composition and the particle size is not stable, especially the silicon content of those is higher and the particle size larger, and with the iron grade in 60%-66% and silica in 4%-10%, likely causing fluctuation in the blast furnace production. To this problem, a lot of research work has been done in our plant and as a result, the laid off dressing means are used again to decrease the silica content and improve the iron concentrate grade of the out-purchased iron concentrate, proving the qualified concentrate to the blast furnace production.