Effects of smelting parameters on the slag/metal separation behaviors of Hongge vanadium-bearing titanomagnetite metallized pellets obtained from the gas-based direct reduction process |
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Authors: | Cong Feng Man-sheng Chu Jue Tang Zheng-gen Liu |
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Institution: | 1.School of Metallurgy,Northeastern University,Shenyang,China |
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Abstract: | Smelting separations of Hongge vanadium-bearing titanomagnetite metallized pellets (HVTMP) prepared by gas-based direct re-duction were investigated, and the effects of smelting parameters on the slag/metal separation behaviors were analyzed. Relevant mecha-nisms were elucidated using X-ray diffraction analysis, FACTSAGE 7.0 calculations, and scanning electron microscopy observations. The results show that, when the smelting temperature, time, and C/O ratio are increased, the recoveries of V and Cr of HVTMP in pig iron are improved, the recovery of Fe initially increases and subsequently decreases, and the recovery of TiO2in slag decreases. When the smelting CaO/SiO2ratio is increased, the recoveries of Fe, V, and Cr in pig iron increase and the recovery of TiO2in slag initially increases and sub-sequently decreases. The appropriate smelting separation parameters for HVTMP are as follows: smelting temperature of 1873 K; smelting time of 30–50 min; C/O ratio of 1.25; and CaO/SiO2ratio of 0.50. With these optimized parameters (smelting time: 30 min), the recoveries of Fe, V, Cr, and TiO2are 99.5%, 91.24%, 92.41%, and 94.86%, respectively. |
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