Method for recycling selenium in electrolytic manganese anolyte

Abstract

The invention discloses a method for recycling selenium in electrolytic manganese anolyte. The method comprises the following steps of: S1, adding iron powder into the electrolytic manganese anolyte with the amount of the iron powder of 100-400mg.L<-1>, stirring at the stirring speed of 300-600r / min<-1>, reacting at the reaction temperature of 30-90 DEG C for 50-120 min, filtering and taking filter residue; and S2, drying the filter residue at 40-100 DEG C, then putting the filter residue into a container, adding hydrogen peroxide with the amount of 3.5-6 L per kilograms of selenium slag, adding sulfuric acid with the amount of 0-1.5 L per kilograms of selenium slag, reacting at the reaction temperature of 70-90 DEG C for 80-130 min, filtering after completing reaction, and enabling filtrate to return for the production of electrolytic manganese. The selenium in the anolyte can be recycled relatively well, the emission of the selenium in electrolytic manganese waste residue can be greatly reduced while economic benefits are gained, and the environment pollution caused by the selenium is reduced.

Description

technical field [0001] The invention relates to the technical field of electrolytic manganese, in particular to a method for recovering selenium from electrolytic manganese anolyte. Background technique [0002] As an important metallurgical and chemical raw material, electrolytic manganese has a very important strategic position in the national economy. At present, my country's annual output of electrolytic manganese metal is about 1.2 million tons, ranking first in the world in production and sales. The production process of electrolytic manganese metal mainly includes: manganese ore leaching → impurity removal → filter pressing → electrolysis → passivation → stripping → drying and other processes. About 45 tons of anolyte are produced in the electrolysis process for every ton of electrolytic manganese metal product produced. Since the anolyte contains a certain concentration of sulfuric acid and manganese ions, the anolyte is usually sent back to the manganese ore leach...

AI Technical Summary

Problems solved by technology

[0004] Due to the low selenium content in the electrolytic manganese anolyte (~0.01g / L), the recovery is difficult, and there are still obvious deficiencies in many aspects such as the economic feasibility of the existing selenium recovery technology, and there is no recovery of the electrolytic manganese anolyte at present. Production report of selenium

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