Up-grading of natural ilmenite ore by combining oxidation and acid leaching
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第7期
论文作者：Takehito Hiraki Yuta Suzuki Satoshi Itoh Tetsuya Nagasaka
文章页码：729 - 736
摘 要：Rutile（TiO2） is heavily used in pigments and colorants, and the most abundant source of rutile is ilmenite. Upon oxidation of ilmenite, rutile can be formed with modest energy consumption; furthermore, after leaching, only a few byproducts are formed. Unfortunately, one drawback is the necessarily long oxidative process of typically used methods. In this study, we show that a fluidized bed reactor can be used to oxidize ilmenite ore to rapidly form rutile and pseudobrookite（Fe2TiO5） phases. Ilmenite was oxidized with 5 vol% O2 in Ar at temperatures of 1173 K or 1223 K and subsequently leached using a diluted H2SO4 solution to dissolve the pseudobrookite phase. The effects of acid concentration, temperature, and cooling rate after oxidation were investigated. We show that the ilmenite was rapidly oxidized to form rutile and pseudobrookite phases at 1173 and 1223 K in a 5 vol% O2/95 vol% Ar environment within 40 min. The final maximum rutile yield was 84.2 mol% after leaching in（1 + 1） H2SO4 solution at 393 K for 12 h.
Takehito Hiraki1，Yuta Suzuki3，Satoshi Itoh4，Tetsuya Nagasaka1
1. Department of Metallurgy, Graduate School of Engineering, Tohoku University3. Fanuc Co., Ltd.4. Graduate School of Environmental Studies, Tohoku University
摘 要：Rutile（TiO2） is heavily used in pigments and colorants, and the most abundant source of rutile is ilmenite. Upon oxidation of ilmenite, rutile can be formed with modest energy consumption; furthermore, after leaching, only a few byproducts are formed. Unfortunately, one drawback is the necessarily long oxidative process of typically used methods. In this study, we show that a fluidized bed reactor can be used to oxidize ilmenite ore to rapidly form rutile and pseudobrookite（Fe2TiO5） phases. Ilmenite was oxidized with 5 vol% O2 in Ar at temperatures of 1173 K or 1223 K and subsequently leached using a diluted H2SO4 solution to dissolve the pseudobrookite phase. The effects of acid concentration, temperature, and cooling rate after oxidation were investigated. We show that the ilmenite was rapidly oxidized to form rutile and pseudobrookite phases at 1173 and 1223 K in a 5 vol% O2/95 vol% Ar environment within 40 min. The final maximum rutile yield was 84.2 mol% after leaching in（1 + 1） H2SO4 solution at 393 K for 12 h.
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