Recovery treatment process of mercury-containing waste hydrochloric acid

A technology for recycling and processing waste hydrochloric acid, which is applied in the direction of chlorine/hydrogen chloride purification, chlorine/hydrogen chloride, etc., can solve the problems that affect the survival and development of enterprises, high processing costs, and poor processing effects, and achieve good economic benefits and avoid pollution.

Active Publication Date: 2011-01-26
昊华宇航化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although China attaches great importance to the prevention and control of mercury pollution, the existing methods generally have problems such as poor treatment effect or high treatment cost.
However, with the strengthening of national environmental protection management, if chlor-alkali enterprises cannot properly handle the by-product hydrochloric acid and mercury in acidic water, the survival and development of enterprises will inevitably be affected.

Method used

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  • Recovery treatment process of mercury-containing waste hydrochloric acid
  • Recovery treatment process of mercury-containing waste hydrochloric acid
  • Recovery treatment process of mercury-containing waste hydrochloric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The recovery and treatment process of mercury-containing waste hydrochloric acid, such as figure 1 As shown, the steps include:

[0022] 1) Pass the waste hydrochloric acid with a mercury content of 30mg / L into a strong basic anion exchange resin tower (filled with British Purite A600MB strong basic anion exchange resin) for ion exchange, and control the flow rate of mercury-containing waste hydrochloric acid to 10L / min Collect and flow out hydrochloric acid in the finished product hydrochloric acid tank, and the mercury content of sampling analysis flowing out hydrochloric acid is 0.05mg / l.

[0023] 2) When the mercury content of the effluent hydrochloric acid reaches more than 0.1mg / L, regenerate the anion exchange resin: feed the regenerant (10wt% sodium sulfite aqueous solution) from the bottom of the resin tower, and control the flow rate of the regenerant at 5L / min. Regeneration treatment for 30 minutes; collect the regeneration waste liquid flowing out from ...

Embodiment 2

[0025] The recovery and treatment process of mercury-containing waste hydrochloric acid, such as figure 1 As shown, the steps include:

[0026] 1) Pass the waste hydrochloric acid with a mercury content of 20mg / L into a strong basic anion exchange resin tower (filled with British Purite A600MB strong basic anion exchange resin) for ion exchange, and control the flow rate of the mercury-containing waste hydrochloric acid to 50 L / min; collect the effluent hydrochloric acid into the finished product hydrochloric acid tank, take a sample and analyze the mercury content of the effluent hydrochloric acid to be 0.08mg / l.

[0027] 2) When the mercury content of the effluent hydrochloric acid reaches above 0.1mg / L, regenerate the anion exchange resin: feed the regenerant (10wt% sodium sulfite aqueous solution) from the bottom of the resin tower, and control the flow rate of the regenerant at 10 L / min , regenerate for 40 minutes; collect the regenerated waste liquid flowing out fr...

Embodiment 3

[0029] The recovery and treatment process of mercury-containing waste hydrochloric acid, such as figure 1 As shown, the steps include:

[0030] 1) Pass the waste hydrochloric acid with a mercury content of 26 mg / L into a strong basic anion exchange resin tower (filled with British Purite A600MB strong basic anion exchange resin) for ion exchange, and control the flow rate of the mercury-containing waste hydrochloric acid to 100 L / min; collect the effluent hydrochloric acid into the finished product hydrochloric acid tank, take a sample and analyze the mercury content of the effluent hydrochloric acid to be 0.02mg / l.

[0031] 2) When the mercury content of the effluent hydrochloric acid reaches above 0.1mg / L, regenerate the anion exchange resin: feed the regenerant (10wt% potassium sulfite aqueous solution) from the bottom of the resin tower, and control the flow rate of the regenerant at 20 L / min , regeneration treatment for 60 minutes; collect the regeneration waste liq...

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Abstract

The invention relates to a recovery treatment process of mercury-containing waste hydrochloric acid, belonging to the chemical technical field. The process comprises the steps of: (1) filling the mercury-containing waste hydrochloric acid in an anion exchange resin tower to carry out ion exchange, and collecting the outflow hydrochloric acid; and (2) regenerating the anion exchange resin when themercury content of the outflow hydrochloric acid is over 0.1 mg / L: filling a regenerant from the bottom of the resin tower, collecting and oxidizing the regenerated waste liquor which flows out from the top of the tower, adding a precipitant in the oxidized waste liquor for precipitation, and filter-pressing to obtain mercury mud. According to the invention, the mercury-containing waste hydrochloric acid firstly passes through the anion exchange resin and the mercury in the waste hydrochloric acid is adsorbed by the resin to ensure that the obtained outflow hydrochloric acid can satisfy the national standard and is qualified industrial finished hydrochloric acid; then the mercury adsorbed on the resin is transferred into the regenerant waste liquor for oxidization, precipitation and filter-pressing to obtain the mercury mud which is sold to the manufacturers on demand as a product, and the filtrate is retreated via the anion exchange resin and then discharged under the standard.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a recovery and treatment process of mercury-containing waste hydrochloric acid, in particular to the removal and recovery of mercury in waste hydrochloric acid, a by-product of calcium carbide polyvinyl chloride production. Background technique [0002] In the production of polyvinyl chloride, acetylene gas-phase method is used to produce vinyl chloride, that is, activated carbon is used as the carrier, mercury chloride is adsorbed as the catalyst, and acetylene and excess hydrogen chloride are subjected to gas-phase addition reaction in a converter equipped with a catalyst. The reaction temperature is 160-180 ℃. Therefore, the synthesized crude vinyl chloride contains excess hydrogen chloride and sublimed mercuric chloride. Most domestic chlor-alkali enterprises use activated carbon adsorption to remove mercury chloride. Crude vinyl chloride gas removes most of the merc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07
Inventor 毛晓军王松波付胜堂屈凌波王志勇刘娟肖咏梅焦高成
Owner 昊华宇航化工有限责任公司
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