Novel method for purifying and repeatedly using lead and zinc smelting flue gas washing contaminated acid wastewater

Abstract

The invention relates to a novel method for repeatedly using a lead and zinc smelting flue gas washing contaminated acid wastewater, subjected to removal of harmful elements such as fluorine, chlorine, arsenic and mercury through three-level purification treatment, by being directly returned to a zinc leaching related process. The novel method comprises the following steps: conducting dechlorination on the contaminated acid through an antichlor at normal temperature and normal pressure, displacing the filtrate through a zinc plate, conducting solid-liquid separation on the generated metal replacement, and finally repeatedly using the wastewater, subjected to the fluorine removal agent treatment to meet the leachate reuse requirements of the related zinc leaching related process, by being returned to the zinc leaching system. The novel method has the advantages that the production cost is low, the process is short, the resource recycling utilization rate is high, the energy consumption is low, waste is used to treat waste, and the environmental pollution is less.

Description

technical field [0001] The invention relates to the field of treatment of lead-zinc smelting flue gas washing sewage acid wastewater, specifically a lead-zinc smelting flue gas washing sewage containing one or more heavy metals such as cadmium, arsenic, mercury, lead, zinc, copper, thallium, etc. A method for purifying and reusing acid waste water belongs to the technical field of environmental protection metallurgy. Background technique [0002] After the purification section of the sulfuric acid workshop of non-ferrous smelting enterprises washes and purifies the smelting flue gas, impurities such as arsenic, mercury, fluorine, chlorine, and dust in the flue gas enter the circulating acid, and when the impurities are enriched to a certain extent, they are discharged out of the system to a certain extent Amount of dirty acid. In addition to the above-mentioned impurities, dirty acid also contains a large amount of sulfuric acid. Sulfuric acid and other impurity elements w...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of the existing single process technology, the present invention provides a new method for purifying and reusing lead-zinc smelting flue gas washing dirty acid waste water, which is clean and efficient, low in cost, simple in operation, high in resource recycling rate, and low in energy consumption. Specific methods include:

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