Method for treating manganese-containing wastewater

Abstract

The invention discloses a method for treating manganese-containing wastewater, which comprises the following steps: (1) adding alkaline substances into the manganese-containing wastewater; (2) stirring the manganese-containing wastewater into 2 The gas is passed into manganese-containing waste water for reaction; (3) after the reaction is completed, solid-liquid separation is carried out to obtain manganese carbonate solid and manganese removal solution. The treatment method of the manganese-containing wastewater of the present invention is to treat waste by using waste, adopting sulfuric acid leaching in the production process of electrolytic manganese or the waste gas containing carbon dioxide produced by boiler combustion in the production process of electrolytic manganese, and adding a small amount of alkaline substances, the waste gas containing The effective recovery of manganese resources in manganese wastewater has a certain economic value; at the same time, the manganese removal solution produced can be returned to the production of electrolytic manganese, electrolytic manganese dioxide or electrolytic manganese tetraoxide for reuse, and no waste is generated in the whole process, protecting the environment.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a treatment process for manganese-containing waste water produced in the production process of hydrometallurgy (such as electrolytic manganese and electrolytic manganese dioxide). Background technique [0002] In recent years, my country's electrolytic manganese industry has developed rapidly and its production capacity has expanded rapidly, making my country the world's largest producer, exporter and consumer of electrolytic manganese. At present, electrolytic manganese is mainly produced by leaching manganese carbonate ore with sulfuric acid. During the leaching process, a large amount of carbon dioxide-containing gas is produced, which is directly discharged into the air. In the process of electrolytic manganese production, a large amount of manganese-containing wastewater such as plate washing wastewater, flushing tank surface wastewater, ground flushing water, plate and ...

AI Technical Summary

Problems solved by technology

This method is simple and easy to implement, but the excessive lime and other alkaline substances added make the solution after manganese removal alkaline and cannot be discharged directly, and the product after manganese removal contains more unreacted lime, which requires excessive acid consumption. , so that the method cannot be used economically

The carbonate manganese removal method needs to be carried out at a temperature greater than 20°C, and the pH needs to be controlled at 8.8-9, and the amount of carbonate used is more than 200% of the theoretical amount. Consumption of a large amount of reagents, high operating costs

Ion exchange method for manganese removal or membrane treatment of manganese-containing wastewater requires the use of a large number of ion exchange resins or ultrafiltration membranes, reverse osmosis membranes, etc. The cost of ion exchange resins, ultrafiltration membranes, and reverse osmosis membranes is relatively high, which makes the operating costs of these methods Increased height, limited application

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