Rare earth alloy anode for electrodeposited zinc, and preparation method thereof

Abstract

The invention relates to a rare earth alloy anode for electrodeposited zinc, and a preparation method thereof, which belong to the field of nonferrous metal application. The rare earth alloy anode for the electrodeposited zinc is prepared from the components in percentage by weight: 0.001 to 0.05 percent of rare earth, 0.2 to 0.5 percent of silver, and the balance lead. The preparation method comprises the steps of feeding a lead ingot into an industrial frequency furnace for melting, and fetching slags when the temperature reaches to 500 DEG C; when the melt temperature reaches to 600 DEG C, feeding a prefabricated lead-silver master alloy; adding a carbon dust covering agent in the industrial frequency furnace; when the melt temperature reaches to 650 DEG C, using a bell jar for adding a rare earth master alloy, and electromagnetically or mechanically stirring for 10min; carrying out closed over-entering and down-out constant-volume casting; and after casting a workblank, rolling and welding to obtain the rare earth alloy anode. According to the rare earth alloy anode for electrodeposited zinc, and the preparation method thereof provided by the invention, the rare earth with refined grains and an anode activation performance is selectively added on the basis of a Pb-Ag binary alloy, and the closed over-entering and down-out castig process is adopted, so that the rare earth investment is less, the burning loss is less, and the effective components in the rare earth in a finished product are ensured to meet the requirement.

Description

technical field [0001] The invention belongs to the application field of nonferrous metals, and in particular relates to a rare earth alloy anode for zinc electrodeposition and a preparation method thereof. Background technique [0002] With the improvement of environmental protection and energy saving index requirements, the comprehensive recycling and reuse of resources has become the development trend of metal purification. The composition of raw materials for electrodeposited zinc is complicated. The impurities in the electrodeposited zinc solution are difficult to open, and the harmful elements continue to increase. The anode material that affects the energy consumption of electrodeposited zinc and the quality of the precipitated zinc product plays a key role. Electrodeposited zinc smelting enterprises require anode plates with corrosion resistance, good electrical conductivity, high mechanical strength, long service life and lower cost. [0003] For a long time, Pb-Ag...

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Problems solved by technology

[0003] For a long time, Pb-Ag binary alloys have been widely used in electrodeposited zinc anodes, with an Ag content of 0.75%-1.2%. The problems with this type of anode plate are: (1) The amount of Ag added to the Pb-Ag binary alloy anode metal Push up the cost of the anode; (2) high oxygen overpotential, high energy consumption; (3) low strength, easy to deform, causing electric shock and short circuit, affecting electric efficiency; (4) easy to corrode and short service life, resulting in lead deposition on the negative electrode Affect the quality of cathode zinc

The research and discussion on the preparation and performance of lead-based rare earth alloy anodes have also been reported in the existing data and literature. Most of the existing preparation methods are carried out in a vacuum furnace, and the chemical composition and dosage of rare earth elements are different. There are differences in base alloy formation