A pre-treatment-based planned power-off cathode zinc back-dissolution inhibition method

By employing a synergistic pretreatment process involving acid-zinc ratio control, step-by-step control, and bath temperature control, an anti-redissolution protective layer is formed, solving the problem of cathode zinc redissolution during planned power outages in remote mountainous areas and achieving efficient cathode zinc protection and production continuity.

CN122406313APending Publication Date: 2026-07-17GANSU BAOHUI INDAL GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GANSU BAOHUI INDAL GROUP
Filing Date
2026-05-08
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

During planned power outages in remote mountainous areas caused by unstable power grids, the cathode zinc undergoes severe re-dissolution in the highly acidic electrolyte, resulting in production losses and high labor costs. Existing solutions are ineffective against prolonged power outages and lack economically reliable pre-protection mechanisms.

Method used

A synergistic pretreatment process is adopted, which optimizes electrolyte composition by adjusting the acid-zinc ratio, reduces current density by step control, and enhances interface stability by controlling cell temperature, to form an anti-redissolution protective layer and inhibit the redissolution of cathode zinc.

Benefits of technology

Without adding new equipment or changing the basic process flow, it can significantly reduce the cathode zinc remelting rate to ≤5%, improve the metal recovery rate, ensure production continuity, reduce labor intensity and production costs, and is suitable for mining areas with weak infrastructure.

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Abstract

A pre-treatment-based planned power-off cathode zinc redissolution inhibition method is provided. Before power-off, a synergistic pre-treatment process of acid-zinc ratio regulation and optimization of electrolyte composition, step regulation and reduction of current density, and tank temperature control to strengthen interface stability is adopted, so that a protection layer against redissolution is formed on the cathode zinc during planned power-off, thereby inhibiting the redissolution of the cathode zinc. The present application performs directional pre-adjustment on the key parameters of the conventional wet zinc refining electrodeposition process before power-off, optimizes the electrolyte composition, step regulation of current density, and strengthens the interface stability of the electrolytic tank, so that the cathode zinc maintains an electrochemically inert state during power-off without adding equipment or changing the basic process flow. The present application achieves a technical effect of redissolution rate ≤ 5%, significantly reduces the dissolution loss of zinc during planned power-off, improves the metal recovery rate, and ensures the continuity of production, and is especially suitable for mineral areas with weak infrastructure.
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