Novel deep mercury removal process

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...

AI Technical Summary

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 seriously restricts the sustainable development of the acetylene process

In addition, my country's mercury resources are relatively scarce. According to statistics, through the mining of primary mercury mines and mercury recovery, the annual supply of mercury is about 1,000-1,200 tons, and the mercury resources are likely to be exhausted. Therefore, the excessive consumption of mercury resources also limits the production of calcium carbide. The development of PVC

Therefore, excessive consumption of mercury resources and mercury pollution have become bottlenecks for the sustainable development of the PVC industry

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