Product Description
Zinc hydrometallurgy is a process of dissolving zinc from zinc calcine or other zinc sulfide materials and zinc sulfide concentrates in an aqueous solution, and extracting metallic zinc by electrolysis.
In the electrolysis process, industrial pure aluminum is commonly used as the cathode plate, and zinc sulfate is used as the electrolyte. The anode plate is a calcium strontium lead silver quaternary alloy plate. High purity metal zinc is usually obtained by electrolysis, and the cathode plate of aluminum plate electrolysis is aluminum plate. The straightness of aluminum cathode plates directly affects the quality and production efficiency of electrolytic zinc. The high requirements for straightness not only affect the production cost of electrolytic zinc, but also affect the electrolytic efficiency and quality of electrolytic zinc.
During the pretreatment or use of the electrolyte, due to the presence of fluorine and chlorine plasma in the electrolyte, corrosion pits are easily formed on the surface of the aluminum cathode plate, which seriously affects the electrolytic effect and service life of the aluminum cathode plate. In response to the problem of unstable corrosion resistance and short service life of aluminum cathode plates in zinc sulfate electrolyte, we analyzed the corrosion process and mechanism of aluminum alloy cathode plates in zinc sulfate electrolyte, identified the reasons for their faster corrosion rate, and improved the corrosion resistance of aluminum cathode plates in zinc sulfate electrolyte through heat treatment and rolling processes. Finally, the method of adding borate in the aluminum smelting process was used to improve the corrosion resistance of aluminum cathode plates in zinc sulfate electrolyte, Effectively remove the iron impurity content in the cathode plate, improve the morphology and distribution of iron containing impurity phases, and further improve the corrosion resistance of the aluminum cathode plate.
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