Desulfurized lead-containing wastewater recycling processing method

Abstract

The invention which discloses a desulfurized lead-containing wastewater recycling processing method relates to the technical field of lead ore smelting. The method is characterized in that the method comprises the following steps: adding a 20-50% sodium sulfide solution with the weight required by a theoretical reaction at normal temperature according to the content of heavy metals in the wastewater, stirring to fully react, taking a quantitative amount of the obtained solution, adding the sodium sulfide solution drop by drop to inspect until no deposition appears, that is, the reaction is completed, filtering out filter residues, slowly adding the filtered solution to a theoretic amount of barium hydroxide, reacting for 20-60min under stirring, and filtering to obtain barium sulfate which can be applied to the storage battery manufacturing operation and a sodium hydroxide solution which returns to a desulfurization system. According to the method of the invention, the heavy metals of lead, copper, cadmium and the like can be removed from the desulfurized lead-containing wastewater, and the wastewater is regenerated into the sodium hydroxide solution which returns to the desulphurization operation with above barium salt, so a problem of secondary pollution of traditional technologies is fundamentally and scientifically avoided, no pollutants are discharged, and energy saving and environmental protection are realized.

Description

technical field [0001] The invention relates to the technical field of lead ore smelting, in particular to a recycling treatment method for desulfurization lead-containing wastewater. Background technique [0002] At present, secondary lead production enterprises use lime to treat and desulfurize wastewater. The gypsum produced contains heavy metals such as lead, which is hazardous waste and will cause secondary pollution. Therefore, for the recycled lead industrial park, the present invention not only has obvious economic benefits, but also can embody huge social and ecological benefits. For example, Tianying National Circular Economy Industrial Zone in Jieshou City (approved as a national urban mining demonstration base in April 2011) recycles 600,000 tons of waste batteries annually, produces 30 million sets of polar plates annually, and uses more than 300 tons of daily water (Does not include domestic water), if the lead-containing wastewater produced in the process of ...

AI Technical Summary

Problems solved by technology

[0002] At present, secondary lead production enterprises use lime to treat and desulfurize wastewater. The gypsum produced contains heavy metals such as lead, which is hazardous waste and will cause secondary pollution.

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