Effect of Magnesium Flux on Metallurgical Performance of Pellets

In blast furnace smelting, MgO can play a role in improving slag performance. In the production process of pellets, the suitable MgO content is easy to reduce the strength of pellets, but other metallurgical properties of pellet can be improved. In this paper, dolomite is used as the main additive of MgO, and the effects of 0, 1, 3, 8, and 11% different magnesium additive contents on the metallurgical performance of pellets are studied. The results show that with the increase of magnesium additive, the drop strength of the green ball increases, and it increases to 8.3 times when the magnesium additive content is 1.5%. The compressive strength of the green ball first decreases and then rises. When the content is 1.5%, the highest value of 1.5N was reached. The strength of the finished ball gradually decreased to 1990N. The highest reduction degree increased to 80%, and reduction swelling index decreased 10.02%. Meanwhile, the softening and smelting properties of magnesium pellets are improved. The softening and smelting temperature range of single magnesium pellets and mixed burden becomes narrow.