Abstract:In order to study the effect of MgO on the formation of CaOFe2O3based initial melt and the reaction mechanism during the sintering process, the variations of liquid phase formation in samples with different MgO content were investigated by DSC during the heating process. In addition, the effect of MgO on the mineral composition before forming the liquid phase was studied by XRD. The results showed that the increase of MgO content decreased the formation of the initial liquid phase. However, the formation temperature of the liquid phase did not change significantly. There were two mechanisms for MgO addition to inhibiting the formation of the initial liquid phase. One was the reaction of MgO with Fe2O3 to produce magnetite solid solution. The other one was decomposition of CaFe2O4 caused by the addition of MgO. These two mechanisms relatively increased the CaO content and promoted the formation of Ca2Fe2O5 and magnetite solid solution, which were both highmelting temperature minerals, and led to the decrease of the liquid phase. The study of the effect of MgO on the formation of the initial liquid phase was expected to provide a theoretical basis for appropriately adding Mgbearing flux during iron ore sintering process.
杨楠,郭兴敏. MgO对烧结矿CaO-Fe2O3系初期液相生成的影响[J]. 中国冶金, 2019, 29(5): 22-27.
YANG Nan,GUO Xingmin. Effect of MgO on formation of CaOFe2O3 based initial liquid phase in iron ore sinter[J]. China Metallurgy, 2019, 29(5): 22-27.