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Method for comprehensively utilizing supernatant of calcium carbide slurry and dilute brine generated by electrolysis

A technology of calcium carbide slurry and light brine, applied in the field of comprehensive utilization of environmental protection resources, can solve problems such as cost increase, environmental pollution, environmental impact, etc., and achieve the effects of saving cost, saving process water, and saving chlorine gas

Active Publication Date: 2013-04-17
JIANTAO HENGYANG IND
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Problems solved by technology

[0002] In the existing ion-exchange membrane caustic soda production process, the light brine flowing out of the electrolytic cell contains free chlorine, sodium hypochlorite, sodium chlorate and other oxidizing substances. After vacuum dechlorination, there is still a small amount of free chlorine. As a strong oxidant, chlorine is very It is easy to corrode metal equipment and must be cleaned, so it needs to be treated by chemical method, and it is generally necessary to add sodium sulfite for treatment
[0003] Under the current environmental protection situation, if the above-mentioned wastewater is not treated, it will obviously have a great impact on the environment and cause environmental pollution.
However, if it is handled according to the existing method, the cost of the enterprise will also increase a lot virtually.

Method used

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  • Method for comprehensively utilizing supernatant of calcium carbide slurry and dilute brine generated by electrolysis

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Embodiment Construction

[0022] Wet acetylene production is to react calcium carbide with excess water. The resulting acetylene is processed and used for synthesis. After the reaction, the slurry is precipitated, cascaded, and stratified. The lower carbide slag can be used as building materials. Add alkali to the light brine after vacuum dechlorination to adjust the pH to 9-11, exchange heat with refined brine, and add clear liquid to react. Adjust the valve opening of the supernatant liquid pipeline so that the ORP is controlled below zero during the reaction process. In order to prevent sodium chlorate from corroding the pipeline, it is controlled below minus 200mV in the embodiment of the present invention, and is sent to the brine collection pool for the brine collection water.

[0023] Application method: light brine and supernatant are respectively passed through the rotameter to adjust the flow rate and then enter the tubular reactor for reaction. The specific operating data is as follows:

[...

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Abstract

The invention relates to a method for comprehensively utilizing supernatant of calcium carbide slurry and dilute brine generated by electrolysis. The method comprises: carrying out sedimentation, aeration and layering on the calcium carbide slurry to obtain the supernatant for later use; and carrying out vacuum dechlorination on the dilute brine generated by electrolysis during an ionic membrane caustic soda production process, and then mixing with the supernatant for reacting, wherein wastewater obtained by reaction is used as water for dissolving salts and melting salts. In the method provided by the invention, two wastewaters with different physical properties are used as mutual neutralizers for each other to carry out acid-base neutralization and redox reactions, and the treated wastewater is used for dissolving salts and melting salts, so that the method is a comprehensive utilization method which is economic and beneficial and can effectively treat two wastewaters at the same time.

Description

technical field [0001] The invention relates to a technology for comprehensive utilization of environmental protection resources, in particular to a technology for comprehensive utilization of calcium carbide slag slurry supernatant in the production process of wet acetylene and electrolytic light brine in the production process of caustic soda. Background technique [0002] In the existing ion-exchange membrane caustic soda production process, the light brine flowing out of the electrolytic cell contains free chlorine, sodium hypochlorite, sodium chlorate and other oxidizing substances. After vacuum dechlorination, there is still a small amount of free chlorine. As a strong oxidant, chlorine is very It is easy to corrode metal equipment and must be cleaned, so it needs to be treated by chemical method, and generally needs to add sodium sulfite for treatment. [0003] Under the current environmental protection situation, if the above-mentioned wastewater is not treated, it w...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 石爱伟蒋良灿聂清华陈龙李拥国谭松华
Owner JIANTAO HENGYANG IND
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