TY - JOUR
T1 - Up-grading of natural ilmenite ore by combining oxidation and acid leaching
AU - Hiraki, Takehito
AU - Maruyama, Yuichi
AU - Suzuki, Yuta
AU - Itoh, Satoshi
AU - Nagasaka, Tetsuya
N1 - Funding Information:
Financial support was given by the Grants-in-Aid for Challenging Exploratory Research (No. 26630374) in 2014–2015, Japan Society for Promotion of Science (JSPS).
Publisher Copyright:
© 2018, University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/7/1
Y1 - 2018/7/1
N2 - 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.
AB - 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.
KW - acid leaching
KW - fluidized bed reactor
KW - ilmenite
KW - oxidation
KW - pseudobrookite
KW - rutile
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U2 - 10.1007/s12613-018-1620-9
DO - 10.1007/s12613-018-1620-9
M3 - Article
AN - SCOPUS:85049881847
SN - 1674-4799
VL - 25
SP - 729
EP - 736
JO - International Journal of Minerals, Metallurgy and Materials
JF - International Journal of Minerals, Metallurgy and Materials
IS - 7
ER -
