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A kind of lead and zinc smelting flue gas washing polluted acid wastewater purification and reuse method

A technology for polluted acid wastewater and smelting flue gas is applied in the treatment of lead and zinc smelting flue gas washing polluted acid wastewater, environmental protection metallurgy field, and achieves the effects of saving usage, simple operation and high resource recycling rate

Active Publication Date: 2016-08-31
湖南株冶环保科技有限公司
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Problems solved by technology

[0005] Aiming at the deficiency of the existing single process technology, the present invention provides a 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. Methods include:

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  • A kind of lead and zinc smelting flue gas washing polluted acid wastewater purification and reuse method

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Embodiment Construction

[0020] The invention provides a method for purifying and reusing lead-zinc smelting flue gas washing polluted acid waste water. The specific process is to homogenize and settle the dirty acid first, and then add the prepared chlorine removal agent and catalyst from the pipeline connecting the supernatant of the homogenization tank and the chlorine removal reaction tank, so that the agent and the dirty acid are fully and uniformly mixed and reacted, and the chlorine removal The addition amount of the agent is 0.1%, the addition amount of the catalyst is 0.01%, and the dechlorination is continued in the reaction tank, and the control reaction time is 60 minutes. The supernatant of polluted acid after dechlorination enters the heavy metal removal part. The heavy metal removal part is a reaction tank with stirring. Excessive zinc flakes are accumulated in the reaction tank. in 60 minutes. The polluted acid wastewater passes through the zinc chip replacement reaction tank and ente...

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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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 张天芳李迪汉伏东才林文军张鸿彪彭许文
Owner 湖南株冶环保科技有限公司
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