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Volatilisation behaviour of iron, silicon and magnesium during vacuum carbothermal reduction of ilmenite concentrate
Canadian Metallurgical Quarterly ( IF 0.9 ) Pub Date : 2019-05-22 , DOI: 10.1080/00084433.2019.1619062
Xiao-dong Lv 1, 2 , Run Huang 1, 2 , Qin-zhi Wu 1, 2 , Qing-hui Wu 1, 2 , Jin-zhu Zhang 1, 2
Affiliation  

ABSTRACT The non-isothermal reduction kinetics and volatilisation behaviour of iron (Fe), silicon (Si), and magnesium (Mg) during the vacuum carbothermal reduction of ilmenite concentrate were investigated from 1350°C to 1550°C. Mg species was reduced to metallic Mg before volatilisation. Some Si elements were reduced to Si, which entered into the Fe phase to form ferrosilicon alloy, and others were reduced to SiO before volatilisation. The volatilisation of Fe came from the metallic Fe phase. For the comprehensive consideration of Šatava–Šesták and Coats–Redfern methods, the rate-limiting factors of Fe, Mg, and Si were diffusion control. The integral mechanism functions of Fe, Mg, and Si were G(α) = [1−(1−α)1/3]2, G(α) = 1−2α/3−(1−α)2/3, and G(α) = (1−α)ln(1−α) + α, respectively. The apparent activation energy for volatilisation processes of Fe, Mg, and Si were 1043.02 ± 12.29, 253.15 ± 7.63, and 314.46 ± 6.04 kJ mol−1, respectively.

中文翻译:

钛铁精矿真空碳热还原过程中铁、硅和镁的挥发行为

摘要 对钛铁矿精矿真空碳热还原过程中铁 (Fe)、硅 (Si) 和镁 (Mg) 的非等温还原动力学和挥发行为进行了研究,从 1350°C 到 1550°C。Mg 物质在挥发前被还原为金属 Mg。一些Si元素被还原为Si,进入Fe相形成硅铁合金,另一些元素在挥发前被还原为SiO。Fe的挥发来自金属Fe相。综合考虑Šatava-Šesták 和Coats-Redfern 方法,Fe、Mg 和Si 的限速因素是扩散控制。Fe、Mg、Si 的积分机制函数为 G(α) = [1−(1−α)1/3]2, G(α) = 1−2α/3−(1−α)2/3 , 和 G(α) = (1−α)ln(1−α) + α 分别。Fe挥发过程的表观活化能,
更新日期:2019-05-22
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