Method for co-processing nickel-metal hydride battery pole plate by using ferronickel mother liquor

By co-processing nickel-metal hydride battery plates with nickel-iron mother liquor, and adopting acid washing and alkaline dissolution treatment combined with the use of nickel-iron mother liquor, the problem of difficult recovery of Fe and Al impurity elements in the existing technology is solved, and efficient resource utilization and recycling effects are achieved.

CN120666176APending Publication Date: 2025-09-19HUNAN BRUNP RECYCLING TECH CO LTD +1
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Patent Information

Application Number
CN202510843129.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-23
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

Existing technologies make it difficult to effectively recycle Fe and Al impurity elements from nickel-hydrogen battery plates, resulting in high recycling costs and low resource utilization rates.

Method used

A method of co-processing nickel-metal hydride battery plates with nickel-iron mother liquor is adopted. The alloy particles are treated by acid washing and alkali dissolution, combined with the use of nickel-iron mother liquor, to achieve resource utilization of Fe and Al, and simultaneously recover the nickel-iron mother liquor.

Benefits of technology

It improves the recycling effect of nickel-metal hydride battery plates, realizes the resource utilization of Fe and Al, reduces the waste residue treatment cost in the production process, and creates high-value products.

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Abstract

The invention provides a method for co-processing a nickel-metal hydride battery pole plate by using a nickel-iron mother liquor, which comprises the following steps: (1) crushing a waste nickel-metal hydride battery pole plate into alloy particles, carrying out acid pickling and alkali dissolution to obtain mixed slurry, heating, and carrying out solid-liquid separation to obtain a sodium aluminate solution and alkali dissolution residues; (2) performing acid leaching activation on the alkali dissolution residues, mixing the alkali dissolution residues with ferronickel mother liquor and an acid solution, and performing solid-liquid separation after leaching to obtain leachate and residues; (3) mixing and heating the leachate, phosphoric acid and an oxidizing agent, and carrying out solid-liquid separation to obtain a solution containing lanthanum, nickel, cobalt and manganese and iron phosphate; (4) extracting lanthanum from the lanthanum-containing nickel-cobalt-manganese solution to obtain nickel-cobalt-manganese raffinate and solid lanthanum salt; and (5) mixing the sodium aluminate solution with the nickel-cobalt-manganese raffinate, adjusting the pH value, heating, and carrying out solid-liquid separation to obtain the nickel-cobalt-manganese solution. According to the method, the nickel-iron mother liquor is used for carrying out cooperative treatment on the nickel-metal hydride battery pole plate, so that resource utilization of iron and aluminum and recycling of the nickel-iron mother liquor can be realized.
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Citation Information

Patent Citations

  • Environment-friendly comprehensive recovery method of valuable metals of nickel-hydrogen battery

    CN111763828A