A method for separately recovering gallium-lutetium from gallium-lutetium garnet waste

By employing steps such as crushing, alkali melting, water immersion, pure water washing, silicon and aluminum removal reaction, acid leaching, iron removal extraction, and oxalic acid precipitation, the problem of separating gallium and lutetium from gallium-lutetium garnet waste has been solved, achieving efficient recovery and resource utilization of gallium and lutetium.

CN119530535BActive Publication Date: 2025-10-28FIRST RARE MATERIALS CO LTD
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Patent Information

Application Number
CN202411727420.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2025-10-28
Estimated Expiration
2044-11-28

AI Technical Summary

Technical Problem

Existing technologies lack effective methods for separately recovering gallium and lutetium from gallium-lutetium garnet waste, making it difficult to separate and utilize gallium and lutetium resources.

Method used

Gallium and lutetium are separated and recovered through steps such as crushing, alkali melting, water immersion, pure water washing, silicon and aluminum removal reaction, acid leaching, iron removal by extraction, purification by extraction and oxalic acid precipitation. This includes treating the water immersion solution with calcium hydroxide, pH adjustment of the precipitation reaction, and selective treatment with extractant and back-extraction agent.

Benefits of technology

Gallium and lutetium were successfully recovered from gallium-lutetium garnet waste, improving the recovery rate and purity of gallium and lutetium, realizing the resource utilization of gallium and lutetium, and overcoming the defect of gallium and lutetium being difficult to separate in traditional methods.

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Abstract

This application belongs to the field of renewable resource recycling technology, and particularly relates to a method for separately recovering gallium and lutetium from gallium-lutetium garnet waste. The method provided by this application separates gallium and lutetium into a water leaching solution and a water leaching residue after alkaline melting. Subsequently, the water leaching solution is subjected to silicon and aluminum removal to precipitate gallium hydroxide. The water leaching residue is then acid-leached, and the acid leaching solution is extracted to remove iron, purified by extraction, and back-extracted. An excess of oxalic acid is added to ensure that lutetium is fully precipitated in the lutetium-rich back-extraction solution after back-extraction. The lutetium oxalate precipitate is then calcined to obtain lutetium oxide, thereby realizing the separate recovery of gallium and lutetium from gallium-lutetium garnet waste and solving the technical problem of the lack of a method for separately recovering gallium and lutetium from gallium-lutetium garnet in the prior art.
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