Feasibility analysis of hydrogen reduction-titanium-rich separation of low-grade titanium magnetite

TONG Shuai; AI Liqun; HONG Lukuo; ZHANG Shuai; YUAN Zhipeng; SUN Caijiao; CHEN Jiansong

doi:10.13228/j.boyuan.issn0449-749x.20240029

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Iron and Steel ›› 2024, Vol. 59 ›› Issue (10) : 32-38. DOI: 10.13228/j.boyuan.issn0449-749x.20240029

Raw Material and Ironmaking

Feasibility analysis of hydrogen reduction-titanium-rich separation of low-grade titanium magnetite

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Abstract

Vanadium-titanium magnetite is a characteristic mineral resource rich in iron, vanadium and titanium, which has high comprehensive utilization value. Due to isomorphism and micro-particle embedding, it is difficult to achieve efficient separation and comprehensive utilization of iron and titanium. Based on the mineralogical characteristics and thermodynamic calculation of vanadium-titanium magnetite, a new method of "hydrogen reduction-titanium-rich separation" is proposed to realize titanium-iron separation. Through asynchronous reduction of iron oxide and titanium-iron oxide, iron oxide is transformed into metal Fe, while titanium-iron oxide is basically not reduced, and iron minerals and ilmenite are separated efficiently due to obvious magnetic differences. Under the experimental conditions, with the increase of reduction temperature and time, the recovery rate of titanium decreases and the recovery rate of iron increases. The high reduction temperature and long reduction time are not conducive to the simultaneous separation of ferrotitanium and titanium. Under the conditions of reduction temperature of 900 ℃, reduction time of 50 min, reduction atmosphere of 30%H₂+70%Ar（volume percent）, and magnetic field intensity inductance of 0.8 A, iron concentrate with TFe grade of 78.32% and recovery of 98.12% and titanium-rich ore with Ti grade of 20.92% and recovery of 33.11% can be obtained. The results of chemical composition analysis, X-ray diffraction （XRD） analysis and optical microscope analysis all show that ilmenite is effectively separated from iron minerals,titanium is effectively enriched in perovskite-rich ore. Finally, the comprehensive utilization of magnetic separation products is prospected. On the one hand, iron concentrate can be produced by blast furnace or direct reduction process to provide raw materials, which can not only reduce production cost and iron loss, but also shorten smelting cycle. On the other hand, high value-added FeTi30 alloy can be prepared from titanium-rich ore, and the theoretical calculation meets the requirements. This provides an important research direction for realizing the comprehensive utilization of products after hydrogen reduction-titanium-rich separation treatment of vanadium-titanium magnetite resources.

Key words

vanadium-titanium magnetite / hydrogen reduction-titanium-rich separation / asynchronous restore / separation of titanium and iron / FeTi30 alloy

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TONG Shuai, AI Liqun, HONG Lukuo, et al. Feasibility analysis of hydrogen reduction-titanium-rich separation of low-grade titanium magnetite[J]. Iron and Steel, 2024, 59(10): 32-38 https://doi.org/10.13228/j.boyuan.issn0449-749x.20240029

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