Influence Mechanism of Zn on the Iron Ore-Sintering Mineralization Process

作者：Chen, Xuheng; Wang, Wei^*; Yang, Daiwei; Zheng, Heng; Wang, Lu; Chen, Shijin

来源：Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science , 2023, 54(2): 550-561.

DOI：10.1007/s11663-022-02708-x

• BLAST-FURNACE
• PHASE
• DUST
• ACCUMULATION
• TUYERE
• ZINC

Recovery of metallurgical dust by sintering inevitably incorporates Zn into the sintered ore, which can have a significant impact on the ore formation process and the quality of the resulting ore. Through miniature-sintering experiments and theoretical first-principles calculations, this paper analyzes in detail the influencing mechanism of Zn on the sintering mineralization process. The results showed that the lowest assimilation temperatures (LAT) of the reagent mixture did not change significantly with increasing ZnO content, the liquid-phase fluidity index (IFL), and the magnetite content in the sintered ore decreased, and the silico-ferrite of calcium and aluminum (SFCA) content increased. However, with increasing ZnFe2O4 content, the LAT, IFL, and magnetite contents of the reagent mixture increased, and the content of SFCA decreased. Since the Zn2+ adsorption energies of hematite and magnetite are higher than that of SFCA, Zn was mainly present in the hematite and magnetite in the sintered ore. In addition, Zn was doped into the hematite and magnetite crystals, resulting in a decrease in their crystalline strengths, so the microhardness values of the hematite and magnetite in the sintered ore gradually decreased with increasing Zn content.