Method for recovering high-quality lead from spent lead-acid battery paste by wet electrolysis

CN116575080BActive Publication Date: 2026-05-12TAIHE DAHUA ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TAIHE DAHUA ENERGY TECH CO LTD
Filing Date
2023-05-12
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing technologies for lead paste pretreatment desulfurization are complex, energy-intensive, and environmentally unfriendly; the electrolytic recovery of lead has low current density and high cell voltage, resulting in high energy consumption and limiting industrial application; and the impurities in the lead paste are not purified, leading to low purity of electrolytic lead.

Method used

Lead paste is treated with concentrated sulfuric acid and sulfurous acid to generate lead sulfate and separate impurities. Ammonium acetate metathesis with lead sulfate to generate lead acetate. The residue is extracted by high-temperature oxidation and calcination. Disodium ethylenediaminetetraacetate is used to complex impurities. During electrolysis, an electrolytic anode plate with ammonium acetate electrolyte and graphene composite binder is used.

Benefits of technology

It improves the extraction rate and purity of lead in lead paste, reduces energy consumption, reduces impurity content, and increases electrolysis rate and lead recovery rate.

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Abstract

The application discloses a method for recovering high-quality lead from waste lead storage battery lead paste by wet electrolysis, and belongs to the technical field of lead paste recovery. The method is used for solving the technical problems that the existing technology has a complex process, high energy consumption and the purity of recovered lead needs to be further improved in the process of recovering lead from lead paste. The method comprises the following steps: lead paste and sulfuric acid are added into a beaker, and then are immersed at room temperature for 18-20 hours; then the beaker is transferred to an iron stand with mechanical stirring; sulfurous acid is added into the beaker, and then is reacted at room temperature for 4-6 hours; and pretreated lead paste is obtained through post-treatment; and the pretreated lead paste and an ammonium acetate aqueous solution are added into a nitrogen-protected three-neck flask and are stirred. The method not only effectively simplifies the process flow of extracting lead from lead paste, reduces industrial energy consumption, but also reduces the impurity content in recovered lead while improving the lead recovery rate, and improves the quality of recovered lead.
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