Method for treating sulfate in industrial processes

WO2025186146A8 Publication Date: 2025-10-02UMICORE BATTERY MATERIALS FINLAND OY
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Patent Information

Application Number
PCT/EP2025/055628
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-04
Filing Date
2025-03-03
Publication Date
2025-10-02

AI Technical Summary

Technical Problem

Current methods for processing waste process streams containing potassium sulfate, such as those generated in the battery industry, are energy-intensive and inefficient, necessitating a more sustainable and efficient method to obtain high-purity potassium sulfate for repurposing as a fertilizer.

Method used

A method involving the use of a solvation agent, such as potassium hydroxide and/or ammonia, to reduce the solubility of potassium sulfate in a solution derived from a metal sulfate co-precipitation reaction, facilitating the crystallization of high-purity potassium sulfate through salting-out, followed by recycling the resulting solutions for further use in co-precipitation reactions.

Benefits of technology

This method achieves a high yield of pure crystallized potassium sulfate, enabling efficient material circulation and enhancing process sustainability by reusing the residual solutions, thereby reducing energy consumption and waste.

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Abstract

Disclosed a method for treating sulfate in an industrial process, the method comprising the steps of: a) contacting a first solution containing metal sulfate, preferably transition metal sulfate, with a second solution containing potassium hydroxide, whereby obtaining: a. a first precipitated material comprising metal hydroxide and b. a third solution containing potassium sulfate; b) recovering the third solution; c) providing a salting-out agent, preferably containing at least one of a source of potassium hydroxide and a source of ammonia; d) adding the salting-out agent to and mixing with the third solution, whereby obtaining: a. a second precipitated material comprising potassium sulfate and b. a fourth solution containing the salting-out agent; and e) recovering the second precipitated material and the fourth solution.
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