Hydrometallurgy, volume 215, pages 105994
Extraction of Al and rare earth elements via high-pressure leaching of boehmite-kaolinite bauxite using NH4HSO4 and H2SO4
Valeev Dmitry
1
,
Shoppert Andrei
2
,
Dogadkin D.
1
,
Romashova T.
1
,
Kuzmina Tatyana
1
,
Salazar Concha Cristian
3
3
Universidad Austral de Chile, Valdivia 5110566, Chile
|
Publication type: Journal Article
Publication date: 2023-01-01
Materials Chemistry
Metals and Alloys
Industrial and Manufacturing Engineering
Abstract
High-silica bauxite is not used to obtain sandy-grade alumina owing to its low alumina/silica ratio (μ Si < 3). Acidic methods, such as the use of HCl and NH 4 HSO 4 , show promise for treating this raw material. The leaching of boehmite-kaolinite bauxite from the Severoonezhsk deposit mine (Arkhangelsk region, Russia) using a mixture of NH 4 HSO 4 and H 2 SO 4 was investigated for the first time. The bisulfate method, which combines the advantages of the acidic and alkaline methods, involves bauxite leaching, precipitation of ammonium alum, recrystallization for gibbsite precipitation, and calcination for alumina production. The effects of temperature (130–200 °C), liquid-to-solid ratio (8–12), and duration of leaching (5–90 min) on the degrees of extraction of Al, and rare earth elements (REEs) were evaluated. The extractions of Al, Fe, and Ga were found to be >90%, with most of the silica and titania remaining in the residue; moreover, a REEs extraction of 70%–80% was achieved. Residues obtained after leaching were studied by laser diffraction, XRD, XRF, and SEM to elucidate the leaching mechanism and the solubility of Al-containing minerals, such as boehmite (AlOOH), kaolinite (Al 4 [Si 4 O 10 ](OH) 8 ), and muscovite (KAl 2 [AlSi 3 O 10 ](OH) 2 ). The acquired data can be used to facilitate the development of an effective technology for the treatment of high-silica bauxite in Russia. • Developed ammonium bisulfate method for Al and REEs extraction from bauxite. • Investigated the high-pressure acid leaching method for bauxite treatment. • The extraction of Al, Ga exceeded 90%, for REEs achieved 70%–80%. • Studied the precipitation of ammonioalunite salt from the acidic solution. • A shrinking core model with internal diffusion fits the reaction rate.
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Valeev D. et al. Extraction of Al and rare earth elements via high-pressure leaching of boehmite-kaolinite bauxite using NH4HSO4 and H2SO4 // Hydrometallurgy. 2023. Vol. 215. p. 105994.
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Valeev D., Shoppert A., Dogadkin D., Romashova T., Kuzmina T., Salazar Concha C. Extraction of Al and rare earth elements via high-pressure leaching of boehmite-kaolinite bauxite using NH4HSO4 and H2SO4 // Hydrometallurgy. 2023. Vol. 215. p. 105994.
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TY - JOUR
DO - 10.1016/j.hydromet.2022.105994
UR - https://doi.org/10.1016%2Fj.hydromet.2022.105994
TI - Extraction of Al and rare earth elements via high-pressure leaching of boehmite-kaolinite bauxite using NH4HSO4 and H2SO4
T2 - Hydrometallurgy
AU - Valeev, Dmitry
AU - Shoppert, Andrei
AU - Dogadkin, D.
AU - Romashova, T.
AU - Kuzmina, Tatyana
AU - Salazar Concha, Cristian
PY - 2023
DA - 2023/01/01 00:00:00
PB - Elsevier
SP - 105994
VL - 215
SN - 0304-386X
ER -
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@article{2023_Valeev,
author = {Dmitry Valeev and Andrei Shoppert and D. Dogadkin and T. Romashova and Tatyana Kuzmina and Cristian Salazar Concha},
title = {Extraction of Al and rare earth elements via high-pressure leaching of boehmite-kaolinite bauxite using NH4HSO4 and H2SO4},
journal = {Hydrometallurgy},
year = {2023},
volume = {215},
publisher = {Elsevier},
month = {jan},
url = {https://doi.org/10.1016%2Fj.hydromet.2022.105994},
pages = {105994},
doi = {10.1016/j.hydromet.2022.105994}
}
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