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Volume 25 Issue 7
Jul.  2018
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文章导航 >  矿物冶金与材料学报（英文）  > 2018  >  25(7): 729-736
Takehito Hiraki, Yuichi Maruyama, Yuta Suzuki, Satoshi Itoh, and Tetsuya Nagasaka, Up-grading of natural ilmenite ore by combining oxidation and acid leaching, Int. J. Miner. Metall. Mater., 25(2018), No. 7, pp. 729-736. https://doi.org/10.1007/s12613-018-1620-9
Cite this article as:
Takehito Hiraki, Yuichi Maruyama, Yuta Suzuki, Satoshi Itoh, and Tetsuya Nagasaka, Up-grading of natural ilmenite ore by combining oxidation and acid leaching, Int. J. Miner. Metall. Mater., 25(2018), No. 7, pp. 729-736. https://doi.org/10.1007/s12613-018-1620-9
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研究论文

Up-grading of natural ilmenite ore by combining oxidation and acid leaching

  • Department of Metallurgy, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

  • Toho Titanium Co., Ltd., Kanagawa 253-8510, Japan

  • Fanuc Co., Ltd., Oshino-mura, Yamanashi 401-0511, Japan

  • Before retirement:Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan

  • 通讯作者:

    Takehito Hiraki    E-mail: hiraki@material.tohoku.ac.jp

  • 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 5vol% 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 5vol% O2/95vol% Ar environment within 40 min. The final maximum rutile yield was 84.2mol% after leaching in (1 + 1) H2SO4 solution at 393 K for 12 h.
    • Research Article

    Up-grading of natural ilmenite ore by combining oxidation and acid leaching

    + Author Affiliations
      Abstract
    • 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 5vol% 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 5vol% O2/95vol% Ar environment within 40 min. The final maximum rutile yield was 84.2mol% after leaching in (1 + 1) H2SO4 solution at 393 K for 12 h.
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      • References(21)
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