Harmless treatment method for electrolytic manganese slag

Abstract

The invention provides a harmless treatment method for electrolytic manganese residue, and belongs to the field of solid waste treatment. The harmless treatment method comprises the following step (1)of conveying fresh electrolytic manganese slag to a No.1 mixing tank through a belt conveyor for blending; the step (2) of enabling the electrolytic manganese slag prepared in the step (1) to automatically flow into a No.2 mixing tank for continuous stirring, and conveying the electrolytic manganese slag into a thickener through a slurry pump; the step (3) of concentrating the electrolytic manganese slag in the thickener for solid-liquid separation; the step (4) of collecting slag cleaning liquid separated by the thickener through a catchment basin, and enabling a part of slag cleaning liquidto return to a sulfuric acid leaching workshop for recycling, a part of slag cleaning liquid return to the No.1 mixing tank in the step (1) for blending, and a part of slag cleaning liquid to returnto a waste water treatment station for treatment; and the step (5) of conveying the electrolytic manganese slag concentrated by the thickener to a mixer for stabilization/solidification treatment, andconveying the treated electrolytic manganese slag to a specified area through a pipeline for stockpiling. The above steps are performed continuously. According to the scheme, the purposes of resourceutilization and harmless treatment of manganese slag are achieved, and no new contaminants are generated; and the harmless treatment method has double significances of economy and environmental protection.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a harmless treatment method for electrolytic manganese slag. Background technique [0002] At present, pure manganese is mainly produced by electrolysis, but a large amount of manganese waste slag will be produced in the manufacturing process, and the amount of slag produced per ton of metal manganese is about 7-10 tons. Electrolytic manganese slag is the filtered acid slag produced after the electrolysis of manganese metal. The water content in terms of mass is as high as 23-28%. It is a key pollutant in the electrolytic manganese industry. In addition to metal manganese, manganese slag also contains nickel, lead, Heavy metals such as chromium and zinc are toxic and harmful elements. In addition, because ammonia and ammonium sulfate and other chemicals need to be added in the production process of electrolytic manganese, stacking consumes a large area of ​​land and...

AI Technical Summary

Problems solved by technology

The patent application with the publication number CN103286116B and titled "A Method for Harmless Treatment of Electrolytic Manganese Slag" achieves the purpose of stabilization / solidification treatment of electrolytic manganese slag by adding sodium phosphate and calcium oxide, but there is ammonia gas in the process Overflow, although the ammonia gas has been recovered, but the amount of agent added is too large

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