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Solidification and stabilization method for mercury in mercury contaminants

A technology for pollutants and mercury pollution, which is applied in the field of curing and stabilization of mercury and mercury in mercury pollutants. and other problems, to achieve the effect of low one-time input cost requirements, rapid and fast construction, and poor construction conditions

Inactive Publication Date: 2017-02-15
北京南科大蓝色科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cement-based curing also has limitations: first, mercury oxide has a certain solubility, the curing efficiency is not as high as the chemical action of mercury sulfide, and the stability is also poor. Under long-term conditions, it will be corroded by air and water. Leakage; second, the cement solidified body has a large volume increase ratio, and if it is used for landfill, the required landfill capacity is huge; third, the existence of soluble chloride and organic matter in the soil will have an adverse effect on the cement hydration process
However, the total concentration of leachate obtained by this method is not low enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A method for solidifying and stabilizing mercury in mercury-contaminated soil:

[0055] The mercury-contaminated soil comes from the site after the demolition of an acetylene production polyethylene workshop. The original workshop used mercuric chloride loaded with activated carbon as a catalyst, and leaks and smuggling incidents occurred during the production process.

[0056] The method comprises the steps of:

[0057] (1) Take the above-mentioned mercury-contaminated soil as the original soil, take 2kg of the original soil, remove construction waste, stones and plant roots, crush it, and pass through a 5mm stainless steel sieve; the average mercury content of the sieved soil is 600mg after being mixed evenly / kg;

[0058] (2) Get 360g of analytically pure sodium sulfide and add it to the original soil and fully mix it. After mixing, add 236mL of tap water and stir for 5 minutes at a speed of 20 rpm to ensure sufficient mixing and reaction to obtain the first mixtur...

Embodiment 2

[0063] A method for solidifying and stabilizing mercury in mercury-contaminated soil, said method comprising the steps of:

[0064] (1) Take mercury-contaminated soil as the original soil, take 5kg of the original soil, remove construction waste, stones and plant roots, crush it, and pass it through a 4mm stainless steel sieve; the average mercury content measured after the sieved soil is mixed is 1000mg / kg ;

[0065] (2) Get 15g of analytically pure sodium sulfide and add it to the original soil and fully mix it. After mixing, add 236mL of tap water and stir for 5 minutes at a speed of 20 rpm to ensure sufficient mixing and reaction to obtain the first mixture;

[0066] (3) Add 500g of 32.5# ordinary Portland cement to the first mixture, and then add an appropriate amount of tap water. The amount of tap water is 25% of the total mass of the first mixture and 32.5# ordinary Portland cement. Stirring speed per minute is fully stirred, and made into a test block after stirring;...

Embodiment 3

[0070] A method for solidifying and stabilizing mercury in mercury-contaminated soil, said method comprising the steps of:

[0071] (1) Take mercury-contaminated soil as the original soil, take 5kg of the original soil, remove construction waste, stones and plant roots, crush it, and pass through a 3mm stainless steel sieve; the average mercury content of the sieved soil is 5000mg / kg;

[0072] (2) Get 62.5kg of analytically pure sodium sulfide and add it to the original soil and fully mix it. After mixing, add 236mL of tap water and stir for 5 minutes at a speed of 20 rpm to ensure sufficient mixing and reaction to obtain the first mixture;

[0073] (3) Add 750g of 32.5# ordinary Portland cement to the first mixture, and then add an appropriate amount of tap water. The amount of tap water is 25% of the total weight of the first mixture and 32.5# ordinary Portland cement. Stirring speed per minute is fully stirred, and made into a test block after stirring;

[0074] (4) The ...

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Abstract

The invention provides a solidification and stabilization method for mercury in mercury contaminants. The method includes the following steps that (1) mercury contaminant particles with the grain diameter not larger than 5 mm are mixed with soluble sulfide and water, and a first mixture is obtained; (2) the first mixture, cement and water are stirred and mixed, the stirring speed ranges from 20 r / min to 40 r / min, and a second mixture is obtained; and (3), after the second mixture is placed, the treated mercury contaminants are obtained. According to the method, the solidification effect of mercury in the contaminants is enhanced, the cement use amount is reduced on a large scale, the solidification capacity-increase ratio is small, and ready-made construction is rapid; and the leaching concentration of mercury after solidified bodies are stabilized for a long time is low, the mechanical strength of the solidified bodies can meet the requirements of ordinary road paving, and the solidification and stabilization method is suitable for mercury contamination repair projects with the large area, the tight schedule, the simple construction conditions and the low one-time invested cost requirement.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste protection and treatment and environmental protection, and relates to a mercury solidification and stabilization method, in particular to a mercury solidification and stabilization method in mercury pollutants. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the points where mercury in the soil exceeded the standard accounted for 1.6%, and there are a large number of mercury-contaminated sites left over from chemical production in the southwestern part of Liaoning In Guizhou, Hunan and other places, there is a large amount of slag after mercury mining. In addition, mercury, as a common heavy metal pollutant, is ubiquitous in decommissioned industrially polluted sites, mining and smelting plants, tailings and slag dumps, polluted rivers or lake ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 胡清林斯杰朱焰石丕星高菁阳
Owner 北京南科大蓝色科技有限公司
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