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

Rutile (TiO 2 ) 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 necessaril...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2018-07, Vol.25 (7), p.729-736
Main Authors: Hiraki, Takehito, Maruyama, Yuichi, Suzuki, Yuta, Itoh, Satoshi, Nagasaka, Tetsuya
Format: Article
Language:English
Subjects:
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Cooling rate
Corrosion and Coatings
Energy consumption
Fluidized bed reactors
Fluidized beds
Glass
Ilmenite
Leaching
Materials Science
Metallic Materials
Natural Materials
Oxidation
Rutile
Sulfuric acid
Surfaces and Interfaces
Thin Films
Titanium dioxide
Tribology
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Summary:Rutile (TiO 2 ) 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 (Fe 2 TiO 5 ) phases. Ilmenite was oxidized with 5vol% O 2 in Ar at temperatures of 1173 K or 1223 K and subsequently leached using a diluted H 2 SO 4 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% O 2 /95vol% Ar environment within 40 min. The final maximum rutile yield was 84.2mol% after leaching in (1 + 1) H 2 SO 4 solution at 393 K for 12 h.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-018-1620-9