Method for purifying zinc electrodeposition anode mud to prepare manganese sulfate and cell grade manganese dioxide

Abstract

The invention discloses a method for purifying zinc electrodeposition anode mud to prepare manganese sulfate and cell grade manganese dioxide. The method comprises the following steps: performing ballmilling on zinc electrodeposition anode mud, performing secondary countercurrent zinc washing, performing reduction leaching on manganese, and removing impurities, thereby obtaining the manganese sulfate solution, wherein the process of performing reduction leaching on manganese comprises the following steps: adding zinc washing slag obtained by zinc washing into deionized water, and introducingreduction gas to perform reduction leaching on manganese, thereby obtaining the leaching liquor. According to the method disclosed by the invention, the operation of each process is very simple and convenient, the requirement on equipment is not harsh, and application to large-scale production is facilitated. According to the method disclosed by the invention, various valuable metal resources in the zinc electrodeposition anode mud can be recycled, lead and silver enter the slag to be fed into a lead smelting furnace so as to recover the lead and silver, and the manganese serves as a supercapacitor electrode material with high additional value in the form of nano-scale alpha-MnO2, so as to be recycled.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for purifying and preparing manganese sulfate and battery-grade nano manganese dioxide from zinc electrodeposition anode slime. Background technique [0002] In the metallurgical industry, the electrode process of the hydrometallurgy process will produce a large amount of zinc electrodeposition anode slime with manganese dioxide as the main component. The zinc electrowinning anode slime returns to the zinc leaching process to remove iron, lead and silver follow into the leaching slag, the leaching slag is volatilized and roasted in a rotary kiln to recover the zinc and part of the lead, and the silver enters the kiln slag and is lost, and the leaching slag is also processed Flotation, but the silver yield is lower. However, in the actual production process, it is found that all the anode slime has been returned to the leaching process in excess, resulting in high m...

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Problems solved by technology

[0002] In the metallurgical industry, the electrode process of the hydrometallurgy process will produce a large amount of zinc electrodeposition anode slime with manganese dioxide as the main component. The zinc electrowinning anode slime returns to the zinc leaching process to remove iron, lead and silver follow into the leaching slag, the leaching slag is volatilized and roasted in a rotary kiln to recover the zinc and part of the lead, and the silver enters the kiln slag and is lost, and the leaching slag is also processed Flotation, but lower silver yield

However, in the actual production process, it is found that all the anode slime has been returned to the leaching process in excess, resulting in high manganese ions in the system solution, which has a negative effect on the electrolytic zinc. Therefore, open-circuit treatment is carried out for part of the anode slime: send it to the lead smelting system, Most of the silver and lead have been recovered, but the manganese cannot be recovered, resulting in losses and an increase in the amount of slag in the lead smelting smelting system, which in turn leads to the loss of non-ferrous metals with slag and the increase in smelting energy consumption

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