Novel deep mercury removal process

A new type of advanced technology, applied in the field of industrial mercury-containing sewage treatment and deep mercury removal technology, can solve the problems of lack of mercury resources, environmental pollution, mercury resource depletion, etc., reduce the cost of sewage treatment, reduce environmental pollution, and have good application prospects Effect

Inactive Publication Date: 2017-01-25
许中石
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Problems solved by technology

HgCl in the traditional acetylene hydrochlorination process has been used in China 2 /AC catalyst (catalyst), highly toxic, the average consumption of mercuric chloride catalyst per 1 ton of PVC production is about 1.2kg (based on 11% mercuric chloride content)
HgCl in the whole PVC production process 2 It is easy to sublimate and volatilize. The volatilization and loss of mercury in the PVC synthesis section is fundamentally unavoidable. The loss of mercury can reach 500 tons per year. Mercury lost to the atmosphere, water or soil will pollute the environment and affect human health. cause serious harm, which

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  • Novel deep mercury removal process

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Embodiment Construction

[0014] According to the attached figure 1 , the present embodiment comprises the following steps: filter the industrial mercury-containing waste water with a gauze to remove impurities such as floating matter and solid sediment, then collect it into a pH adjustment tank, use soda lime to adjust the pH value to 8.5, and remove calcium by filtration The mercury-containing waste liquid behind the slag is pumped into the reaction tank by the transfer pump, and sodium sulfide precipitant is added to the mercury-containing waste liquid in the obtained reaction tank at the same time, and the addition amount is 3 times of the mercury content in the waste liquid, and then the mass fraction is added. The composite ratio of 0.01% ferric chloride and polyaluminum chloride is 1:1 composite flocculant, and the addition amount is composite flocculant molar content: mercury molar content=0.5:1. In the flocculation process, polyacrylamide is added as a flocculant to improve the flocculation ef...

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Abstract

The invention adopts a sulfide precipitation method and an auxiliary adsorption method to remove mercury from mercury-containing wastewater. A wastewater mercury removal device adopts a mercury sulfide precipitation method which comprises the following steps: mainly adopting intermittent operation; adding sulfide in a certain proportion according to the content of mercury in the water; reacting to generate mercury sulfide precipitates; filtering and separating after flocculation and sedimentation; recycling after performing deep adsorption treatment on obtained crude filtrate through activated carbon. The process can effectively treat the mercury-containing wastewater, reduces environmental pollution, and has better application prospects.

Description

Technical field: [0001] The invention belongs to the technical field of chemical industry, relates to industrial mercury-containing sewage treatment technology, and is a novel deep mercury removal process. Background technique: [0002] Vinyl chloride (VCM) is a monomer for synthesizing polyvinyl chloride resin (PVC). As one of the five general-purpose resins (PVC, PE, PP, PS and ABS), PVC is an important plastic product with durable It has many advantages such as abrasion resistance, flame resistance, insulation, corrosion resistance and high mechanical strength, and is widely used in various fields such as building materials, fibers, electrical appliances, and daily appliances. The production process of vinyl chloride in the world can be mainly divided into calcium carbide acetylene method and ethylene oxychlorination method. [0003] At present, the process route of calcium carbide acetylene synthesis of PVC occupies a dominant position in our country. HgCl in the tradi...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F11/12
Inventor 许中石王旭王重斌王国敬徐涛
Owner 许中石
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