Extraction of lithium from lepidolite by sodium bisulphate roasting, water leaching and precipitation as lithium phosphate from purified leach liquors

James Mulwanda; Gamini Senanayake; Hans C. Oskierski; Mohammednoor Altarawneh; Bogdan Z. Dlugogorski

doi:10.1016/j.hydromet.2023.106139

Extraction of lithium from lepidolite by sodium bisulphate roasting, water leaching and precipitation as lithium phosphate from purified leach liquors

James Mulwanda, Gamini Senanayake, Hans C. Oskierski, Mohammednoor Altarawneh, Bogdan Z. Dlugogorski

Department of Chemical & Petroleum

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

This paper presents the extraction process of lithium from lepidolite concentrate by roasting with NaHSO₄ followed by water leaching. Results from TG-DSC analysis of feed material and XRD scans of solids justified the thermodynamic modelling of chemical reactions predicted using HSC software package. The roasting of NaHSO₄/lepidolite concentrate mixture of mass ratio 2.5/1.0 at 500 °C followed by water leaching at 95 °C yielded 96% of Li extraction. Under these conditions, about 79% Rb and 73% Cs were also leached from calcined lepidolite material. Purification of the lepidolite leach liquor by adjusting the solution pH to 9 using caustic soda resulted in the precipitation of cryolite (NaAlF₆) as a primary phase. The purified liquor with pH adjusted to 12 was treated with phosphoric acid to precipitate Li₃PO₄ to achieve a recovery of about 93%.

Original language	English
Article number	106139
Journal	Hydrometallurgy
Volume	222
DOIs	https://doi.org/10.1016/j.hydromet.2023.106139
Publication status	Published - Oct 2023

Keywords

Cryolite
Leaching
Lepidolite
Lithium phosphate
Roasting
Sodium bisulphate

ASJC Scopus subject areas

Metals and Alloys
Industrial and Manufacturing Engineering
Materials Chemistry

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10.1016/j.hydromet.2023.106139

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title = "Extraction of lithium from lepidolite by sodium bisulphate roasting, water leaching and precipitation as lithium phosphate from purified leach liquors",

abstract = "This paper presents the extraction process of lithium from lepidolite concentrate by roasting with NaHSO4 followed by water leaching. Results from TG-DSC analysis of feed material and XRD scans of solids justified the thermodynamic modelling of chemical reactions predicted using HSC software package. The roasting of NaHSO4/lepidolite concentrate mixture of mass ratio 2.5/1.0 at 500 °C followed by water leaching at 95 °C yielded 96% of Li extraction. Under these conditions, about 79% Rb and 73% Cs were also leached from calcined lepidolite material. Purification of the lepidolite leach liquor by adjusting the solution pH to 9 using caustic soda resulted in the precipitation of cryolite (NaAlF6) as a primary phase. The purified liquor with pH adjusted to 12 was treated with phosphoric acid to precipitate Li3PO4 to achieve a recovery of about 93%.",

keywords = "Cryolite, Leaching, Lepidolite, Lithium phosphate, Roasting, Sodium bisulphate",

author = "James Mulwanda and Gamini Senanayake and Oskierski, {Hans C.} and Mohammednoor Altarawneh and Dlugogorski, {Bogdan Z.}",

note = "Funding Information: The authors would like to acknowledge the financial support for this work provided by Murdoch University through a PhD scholarship to James Mulwanda. Publisher Copyright: {\textcopyright} 2023",

year = "2023",

month = oct,

doi = "10.1016/j.hydromet.2023.106139",

language = "English",

volume = "222",

journal = "Hydrometallurgy",

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publisher = "Elsevier",

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T1 - Extraction of lithium from lepidolite by sodium bisulphate roasting, water leaching and precipitation as lithium phosphate from purified leach liquors

AU - Mulwanda, James

AU - Senanayake, Gamini

AU - Oskierski, Hans C.

AU - Altarawneh, Mohammednoor

AU - Dlugogorski, Bogdan Z.

N1 - Funding Information: The authors would like to acknowledge the financial support for this work provided by Murdoch University through a PhD scholarship to James Mulwanda. Publisher Copyright: © 2023

PY - 2023/10

Y1 - 2023/10

N2 - This paper presents the extraction process of lithium from lepidolite concentrate by roasting with NaHSO4 followed by water leaching. Results from TG-DSC analysis of feed material and XRD scans of solids justified the thermodynamic modelling of chemical reactions predicted using HSC software package. The roasting of NaHSO4/lepidolite concentrate mixture of mass ratio 2.5/1.0 at 500 °C followed by water leaching at 95 °C yielded 96% of Li extraction. Under these conditions, about 79% Rb and 73% Cs were also leached from calcined lepidolite material. Purification of the lepidolite leach liquor by adjusting the solution pH to 9 using caustic soda resulted in the precipitation of cryolite (NaAlF6) as a primary phase. The purified liquor with pH adjusted to 12 was treated with phosphoric acid to precipitate Li3PO4 to achieve a recovery of about 93%.

AB - This paper presents the extraction process of lithium from lepidolite concentrate by roasting with NaHSO4 followed by water leaching. Results from TG-DSC analysis of feed material and XRD scans of solids justified the thermodynamic modelling of chemical reactions predicted using HSC software package. The roasting of NaHSO4/lepidolite concentrate mixture of mass ratio 2.5/1.0 at 500 °C followed by water leaching at 95 °C yielded 96% of Li extraction. Under these conditions, about 79% Rb and 73% Cs were also leached from calcined lepidolite material. Purification of the lepidolite leach liquor by adjusting the solution pH to 9 using caustic soda resulted in the precipitation of cryolite (NaAlF6) as a primary phase. The purified liquor with pH adjusted to 12 was treated with phosphoric acid to precipitate Li3PO4 to achieve a recovery of about 93%.

KW - Cryolite

KW - Leaching

KW - Lepidolite

KW - Lithium phosphate

KW - Roasting

KW - Sodium bisulphate

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DO - 10.1016/j.hydromet.2023.106139

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VL - 222

JO - Hydrometallurgy

JF - Hydrometallurgy

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Extraction of lithium from lepidolite by sodium bisulphate roasting, water leaching and precipitation as lithium phosphate from purified leach liquors

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