Recycling method for ferrophosphorus slag

By pressing the phosphate iron slag as the cathode of the electrolytic cell, the separation of iron and aluminum is achieved by reducing electrolytic technology, which solves the problem of difficult separation of aluminum ions in the phosphate iron slag in the prior art, reducing costs and improving environmental friendliness.

WO2025065221A1 Publication Date: 2025-04-03GUANGDONG BRUNP RECYCLING TECH CO LTD +1
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Patent Information

Application Number
PCT/CN2023/121408
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-26
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

In the prior art, when recycling waste lithium iron phosphate batteries, the generated iron phosphate slag still contains a large amount of aluminum ions, and the acid and alkali consumption are high and the cost is high, making it difficult to achieve the complete separation of iron and aluminum.

Method used

By using the phosphate iron slag block as the cathode of the electrolytic cell, the trivalent iron is reduced to divalent iron by reducing electrolytic technology, and the aluminum ions continue to remain in the phosphate iron slag block to achieve separation of iron and aluminum.

Benefits of technology

The process of separating iron and aluminum without using strong acid and alkali reagents is realized, reducing the entrainment of aluminum ions during the impurity removal process, and the separation of iron and aluminum is more thorough and more environmentally friendly.

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Abstract

Provided in the present disclosure is a recycling method for ferrophosphorus slag. The recycling method comprises the following steps: (1) mixing ferrophosphorus slag, a conductive agent and a binder, pressing same into a sheet, then compounding the sheet with a current collector to obtain a cathode electrode, mixing a waste lithium-ion battery positive electrode powder, the conductive agent and the binder, pressing same into a sheet, and compounding the sheet with the current collector to obtain an anode electrode; (2) injecting an electrolyte into a cathode chamber and an anode chamber of an electrolysis device, providing an anion exchange membrane between the cathode chamber and the anode chamber, and applying a voltage to the cathode electrode and the anode electrode to carry out an electrolytic reaction; and (3) adjusting the pH of the cathode chamber, adding an oxidizing agent thereto to carry out an oxidation reaction, and sintering the obtained precipitate to obtain a battery-grade iron phosphate. In the present disclosure, by using the ferrophosphorus slag, which has been pressed into blocks, as the cathode of an electrolytic cell, ferric iron therein is reduced into ferrous iron and dissolved out, and aluminum ions continue to remain in the ferrophosphorus slag blocks, thereby achieving the separation of iron and aluminum.
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