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Aluminum–iron separation in high‐acid leaching solution and high‐purity alumina preparation
Author(s) -
Shen Hairong,
Gao Likun,
Ma Fangtong,
Rao Bing,
Jiang Peng,
Gao Guangyan,
Peng Kebo
Publication year - 2021
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2623
Subject(s) - bauxite , leaching (pedology) , aluminium , raw material , mother liquor , ammonium sulfate , sulfuric acid , metallurgy , crystallization , calcination , bayer process , materials science , recrystallization (geology) , fluorapatite , sulfate , inorganic chemistry , chemistry , mineralogy , catalysis , geology , apatite , biochemistry , organic chemistry , soil science , soil water , paleontology
The demand for bauxite has increased sharply due to the fast development of alumina industry, so new technology must be developed to take full advantage of nontraditional bauxite resources to realize a continuous supply of bauxite. In this experiment, anatase sulfuric acid leaching liquor is taken as the research object to conduct aluminum–iron separation and high‐purity alumina preparation. The leaching solution contains 34.20 g/L of Al 2 O 3 , 25.30 g/L of TFe, 7.96 g/L of TiO 2 , 12.74 mg/L of Sc 2 O 3 , and 288.72 g/L of H 2 SO 4 . When the temperature is low, aluminum and iron condensation, which are not conducive to the separation and recovery of various elements, may occur easily. In this study, the ammonium aluminum sulfate crystallization–recrystallization and ion exchange–calcination method is adopted to effectively separate aluminum and iron in a strong acid solution comprising high concentrations of aluminum and iron without consuming high residual acid in the leaching liquor. Consequently, successful production of high‐added‐value product 4N (99.99%) level γ‐Al 2 O 3 with ammonium aluminum sulfate is obtained through separation as the raw material. The product has a specific surface area of 7.845 m 2 /g with a nearly spherical shape and being evenly distributed. Therefore, it realizes high‐value aluminum utilization from nontraditional bauxite.