Process for recovering rare and precious metals from waste circuit board

By employing a three-step sorting process and the use of magnetic nanocomposite catalyst-complexing agent, the problem of efficient and selective synergistic recovery of various rare and precious metals from waste circuit boards has been solved, achieving a metal separation effect with high recovery rate and low environmental impact.

CN122105126AActive Publication Date: 2026-05-29HUBEI ZHONGYUAN CHUCHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Application Number
CN202610568830.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-28
Publication Date
2026-05-29
Estimated Expiration
2046-04-28

AI Technical Summary

Technical Problem

Existing technologies are insufficient for the efficient and selective synergistic recycling of multiple rare and precious metals from waste circuit boards, and also suffer from high energy consumption, significant environmental risks, and low metal recovery rates.

Method used

A three-step sorting process is adopted, using magnetic nanocomposite catalyst-complexing agent for leaching under ultrasonic field and electrochemical oxidation assistance, combined with alkaline leaching and thiosulfate system to recover metals such as tin, copper, nickel, zinc, aluminum, gold and silver respectively.

Benefits of technology

It achieves efficient and highly selective synergistic recovery of various rare and precious metals in circuit boards, simplifying the process, reducing costs, being environmentally friendly, and significantly improving metal recovery rate and purity.

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Abstract

The invention provides a process for recycling rare and precious metals from waste circuit boards, and belongs to the field of waste resource recycling. The process comprises the following steps: carrying out microwave pyrolysis pretreatment on the waste circuit board to obtain a pretreated material; the pretreated material and a strong alkali solution are leached, and tin-containing filtrate and first filter residues are obtained; mixing the first filter residue, an acidic leaching solution containing Fe < 3 + > and a magnetic nano composite catalysis-complexing agent, and then leaching under the assistance of an ultrasonic field and electrochemical oxidation to obtain a leaching solution; recovering the magnetic nano composite catalysis-complexing agent to obtain a pregnant solution containing copper, nickel, zinc and aluminum and a second filter residue; mixing the second filter residue with a gold leaching system liquid for leaching to obtain a pregnant solution containing gold and silver; and respectively recovering corresponding metals from the tin-containing filtrate, the pregnant solution containing copper, nickel, zinc and aluminum and the pregnant solution containing gold and silver. According to the invention, high-efficiency, high-selectivity and synergistic recovery of various rare and noble metals such as tin, copper, nickel, zinc, aluminum, gold and silver in the circuit board is realized.
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