Method for recovering valuable metals from waste lithium batteries with coal gangue

By using coal gangue adsorbent to treat waste lithium batteries, leveraging its unique structure and active sites, combined with alkaline and acidic solution treatment, efficient and low-cost recovery of valuable metals is achieved, solving the problems of high energy consumption, cumbersome procedures, and environmental pollution in existing technologies.

CN119144833BActive Publication Date: 2026-06-02CNBM RESEARCH INSTITUTE FOR ADVANCED GLASS MATERIALS GROUP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CNBM RESEARCH INSTITUTE FOR ADVANCED GLASS MATERIALS GROUP CO LTD
Filing Date
2024-08-15
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing methods for recycling waste lithium batteries are energy-intensive, involve complicated procedures, consume a lot of energy during separation, and cause serious environmental pollution.

Method used

Coal gangue was used as an adsorbent. Micron-sized pores and abundant adsorption sites were prepared by ball milling. Waste lithium battery cathode materials were treated with alkaline and acidic solutions. Coal gangue was used to adsorb and enrich valuable metal ions. Finally, the materials were eluted with a mixture of nitric acid and hydrogen peroxide.

Benefits of technology

It achieves efficient, low-cost, and environmentally friendly recycling of valuable metals, with recovery rates of over 70.8%, 71.2%, and 60.2% for nickel, cobalt, and manganese, respectively. It simplifies the process and reduces environmental pollution.

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Abstract

This invention relates to a method for recovering valuable metals from waste lithium batteries using coal gangue, characterized by: (1) ball milling and filtering coal gangue to obtain coal gangue particles of 0.5~1μm, and drying them; (2) discharging the waste lithium batteries until they are deactivated, disassembling and collecting the positive electrode material for drying; (3) immersing the positive electrode material in an alkaline solution, filtering it after immersion; continuing to immerse it in an acidic solution, filtering it after immersion to obtain a leachate containing valuable metal ions; (4) adding coal gangue particles, stirring, and filtering to obtain a coal gangue adsorbent carrier loaded with valuable metal ions; (5) immersing the coal gangue adsorbent carrier in a mixture of nitric acid and hydrogen peroxide to obtain a desorption solution rich in valuable metal ions. Advantages of this invention: Utilizing coal gangue as an adsorbent to recover valuable metals from waste batteries, the recovery rate of nickel is ≥70.8%, cobalt is ≥71.2%, and manganese is ≥60.2%. It is environmentally friendly, low-cost, and reusable.
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