A process for extracting aluminium from lithium slag into solution

A two-stage hydrometallurgical process transforms lithium slag into zeolitic phases using an alkaline solution, followed by acidic leaching, effectively extracting aluminium from lithium slag with reduced energy costs and environmental impact.

AU2026202141A1Pending Publication Date: 2026-07-16COMMONWEALTH SCI & IND RES ORG
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Patent Information

Authority / Receiving Office
AU · AU
Patent Type
Applications
Current Assignee / Owner
COMMONWEALTH SCI & IND RES ORG
Filing Date
2026-03-19
Publication Date
2026-07-16

AI Technical Summary

Technical Problem

Conventional acid leaching techniques are ineffective for extracting substantial amounts of aluminium from lithium slag, which is a refractory material, leading to high energy costs and environmental hazards from disposal of Class III waste products.

Method used

A two-stage hydrometallurgical process involving hydrothermal treatment of lithium slag with an alkaline solution to transform aluminosilicate into zeolitic phases, followed by acidic leaching at low temperatures to extract aluminium into solution.

Benefits of technology

Efficient extraction of at least 80-95% of aluminium from lithium slag is achieved with reduced energy consumption and equipment costs, minimizing environmental impact.

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Abstract

Abstract The disclosure provides a process for extracting aluminium from lithium slag into solution, the process comprising: hydrothermally treating lithium slag with an alkaline aqueous solution to produce an aluminium-bearing solid residue comprising at least one zeolitic phase; and leaching the aluminium-bearing solid residue with an acidic leach solution to produce a leachate comprising aluminium extracted from the aluminium-bearing solid residue. Abstract 20 26 20 21 41 19 M ar 2 02 6 1 9 M a r 2 0 2 6 A b s t r a c t 2 0 2 6 2 0 2 1 4 1 1 9 M a r 2 0 2 6 A b s t r a c t 2 0 2 6 2 0 2 1 4 1 1 / 3 Figure 1 Figure 2 0 500 1000 1500 2000 2500 0 10000 20000 30000 40000 50000 60000 0 60 120 180 240 300 360 D is so lv e d A l ( m g / L) D is so lv e d S i ( m g / L ) Extraction time (min.) Caustic soda (4 M) treatment of -spodumene Si 10% Si 20% Si 30% Al 10% Al 20% Al 30% 0 500 1000 1500 2000 2500 0 10000 20000 30000 40000 50000 60000 0 60 120 180 240 300 360 D is so lv e d A l ( m g / L) D is so lv e d S i ( m g / L ) Extraction time (min.) Caustic soda (7 M) treatment of -spodumene Si 10% Si 20% Si 30% Al 10% Al 20% Al 30% 1 / 3 60000 2500 2000 40000 Si 10% Dissolved Si (mg / L) 1500 30000 Dissolved Al (mg / L) Al 10% Al 20% 20000 500 0 0 0 60 120 180 240 300 360 2500 50000 2000 40000 Si 10% Dissolved Si (mg / L) 1500 1000 Dissolved Al (mg / L) 30000 Al 10% Al 20% 20000 Al 30% 500 0 0 0 60 120 180 240 300 360 20 26 20 21 41 19 M ar 2 02 6 6 0 0 0 0 2 5 0 0 2 0 2 6 2 0 2 1 4 1 1 9 M a r 2 0 2 6 2 0 0 0 4 0 0 0 0 D i s s o l v e d S i ( m g / L ) 1 5 0 0 3 0 0 0 0 D i s s o l v e d A l ( m g / L ) A l 1 0 % A l 2 0 % 2 0 0 0 0 A l 3 0 % 5 0 0 0 0 0 6 0 1 2 0 1 8 0 2 4 0 3 0 0 3 6 0 2 5 0 0 5 0 0 0 0 2 0 0 0 4 0 0 0 0 D i s s o l v e d S i ( m g / L ) 1 5 0 0 3 0 0 0 0 1 0 0 0 D i s s o l v e d A l ( m g / L ) A l 1 0 % A l 2 0 % 2 0 0 0 0 A l 3 0 % 5 0 0 0 0 0 6 0 1 2 0 1 8 0 2 4 0 3 0 0 3 6 0 1 9 M a r 2 0 2 6 2 5 0 0 4 0 0 0 0 3 0 0 0 0 2 0 2 6 2 0 2 1 4 1 A l 1 0 % A l 2 0 % 2 0 0 0 0 5 0 0 0 0 0 6 0 1 2 0 1 8 0 2 4 0 3 0 0 3 6 0 2 5 0 0 5 0 0 0 0 2 0 0 0 4 0 0 0 0 D i s s o l v e d S i ( m g / L ) 1 5 0 0 3 0 0 0 0 1 0 0 0 D i s s o l v e d A l ( m g / L ) A l 1 0 % A l 2 0 % 2 0 0 0 0 A l 3 0 % 5 0 0 0 0 0 6 0 1 2 0 1 8 0 2 4 0 3 0 0 3 6 0
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