A method for zinc electrowinning in a low concentration manganese ion system

By pre-plating a MnO2 base film on the anode surface in a low-concentration manganese ion system and combining it with electrolyte recycling, the problems of anode corrosion and sludge production were solved, achieving efficient protection and low-cost operation of the anode.

CN122406306APending Publication Date: 2026-07-17GRINM RESOURCES & ENVIRONMENT TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GRINM RESOURCES & ENVIRONMENT TECH CO LTD
Filing Date
2026-04-30
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In low-concentration manganese ion systems, it is difficult to form a continuous and complete protective film on the anode surface, which leads to increased lead anode corrosion, increased anode sludge production, and affects the quality of cathode zinc and anode service life. Meanwhile, high-manganese systems have problems such as high manganese salt consumption, high cost, and high pressure for solid waste treatment.

Method used

In a low-concentration manganese ion system, a dense and firmly adhered protective film is formed by pre-plating a MnO2 base film on the anode surface. The excessive deposition rate of MnO2 is controlled by the low-manganese electrolyte environment. Combined with regular rinsing and recycling of the electrolyte, the anode protection effect is maintained.

Benefits of technology

It effectively suppresses anode sludge production, extends anode service life, reduces cell voltage loss, improves current efficiency, reduces manganese salt consumption and solid waste output, and enhances production continuity and equipment utilization.

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Abstract

The application discloses a method for zinc electrodeposition in a low-concentration manganese ion system, and realizes the effect of efficiently inhibiting anode mud in the low-concentration manganese ion system. The MnO2-based film generated in advance on the anode surface is dense and firmly attached, can effectively isolate the corrosion of the electrolyte to the anode, and reduces the generation of anode mud such as PbO2 and PbSO4; meanwhile, the low-manganese electrolyte environment greatly reduces the excessive deposition rate of MnO2, avoids the formation of a loose and falling layer, significantly reduces the anode mud deposition amount, and further reduces the anode mud yield. Therefore, the probability of the cathode zinc product being polluted by the anode mud is reduced, and the product quality is guaranteed; the anode corrosion is slowed down, the service life of the anode is prolonged, the cell voltage loss is reduced, and the current efficiency is improved. The reduction of the anode mud deposition amount also significantly prolongs the anode cleaning period, improves the production continuity and the equipment utilization rate. In addition, the low-manganese operation reduces the consumption of manganese salt and the output of manganese-containing solid waste, and the process economy and environmental protection are significantly improved.
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