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Treatment method of fluoride-containing wastewater in cathode carbon block recovery treatment

A technology for recycling and processing cathode carbon blocks, which is applied in filtration treatment, water/sewage treatment, chemical instruments and methods, etc. It can solve problems such as ambient air, water sources, soil pollution, resource waste, etc., and achieve economic benefits and added value Improve and reduce the effect of pollution

Active Publication Date: 2019-02-22
湖南涌鑫源环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of electrolytic aluminum, the electrolytic cell is replaced or repaired every 3-6 years. The replacement or repair of the electrolytic cell produces a large amount of solid waste. Whether the waste is stacked or landfilled, it will pollute the ambient air, water and soil. , but also cause a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for treating fluorine-containing wastewater in the cathode carbon block recovery treatment of the present embodiment comprises the following steps:

[0022] (1) Pretreatment: collect flotation wastewater, and use electrocoagulation technology to remove flotation agents and water glass in the wastewater;

[0023] (2) Pressure filtration: send the wastewater treated in step (1) into a filter press, obtain a supernatant after pressure filtration, and then add sodium chloride and polyaluminum chloride to the supernatant once, And the addition of sodium salt is 30% of the total weight of the primary supernatant, the addition of aluminum salt is 20% of the total weight of the primary supernatant, after stirring evenly, settle to obtain the secondary supernatant;

[0024] (3) Preliminary precipitation: collect the secondary supernatant treated in step (2), add lime to it, stir for 15 minutes to obtain a mixed solution, and obtain a primary filtrate after filtration;...

Embodiment 2

[0030] The method for treating fluorine-containing wastewater in the cathode carbon block recovery treatment of the present embodiment comprises the following steps:

[0031] (1) Pretreatment: collect flotation wastewater, and use electrocoagulation technology to remove flotation agents and water glass in the wastewater;

[0032] (2) Pressure filtration: send the wastewater treated in step (1) into a filter press, obtain a supernatant after pressure filtration, and then add sodium chloride and polyaluminum chloride to the supernatant once, And the addition of sodium salt is 20% of the total weight of the primary supernatant, the addition of aluminum salt is 10% of the total weight of the primary supernatant, after stirring evenly, settle to obtain the secondary supernatant;

[0033] (3) Preliminary precipitation: collect the secondary supernatant treated in step (2), add lime to it, stir for 10 minutes to obtain a mixed solution, and obtain a primary filtrate after filtration;...

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PUM

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Abstract

The invention discloses a treatment method of fluoride-containing wastewater in cathode carbon block recovery treatment. The treatment method comprises the steps of pretreatment, filter pressing, preliminary precipitating, coating, flocculation, regulating of pH and the like. The fluoride-containing wastewater during carbon flotation recovery is recycled completely, up-to-standard discharge (the content of fluorinion is about 8-9 mg / L) is achieved, high-purity cryolite is obtained in the recovery process, the additional value is increased, the economic benefits of enterprises are increased, and meanwhile, pollution is also reduced.

Description

technical field [0001] The invention relates to a treatment method for fluorine-containing wastewater in recycling and processing cathode carbon blocks, and belongs to the technical field of recycling waste cathode carbon blocks. Background technique [0002] In the production process of electrolytic aluminum, the electrolytic cell is replaced or repaired every 3-6 years. The replacement or repair of the electrolytic cell produces a large amount of solid waste. Whether the waste is stacked or landfilled, it will pollute the ambient air, water and soil. , but also cause a waste of resources. According to statistics, in the production process of electrolytic aluminum, for every 10,000 tons of aluminum produced, about 100 tons of waste cathode carbon blocks are produced in the solid waste generated by electrolytic cell replacement or maintenance. More than 25 tons. [0003] According to the "Identification of Hazardous Waste Identification Standard Leaching Toxicity" (GB 5085...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54C02F9/08C02F101/14
CPCC01F7/54C02F1/001C02F1/36C02F1/463C02F1/5236C02F1/5263C02F1/56C02F1/66C02F9/00C02F2101/14
Inventor 张卫
Owner 湖南涌鑫源环保有限公司