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Organic high-sulfur stabilizer and synthesis method thereof, and applications in remediation of heavy metal contaminated soil

A synthetic method and a technology for polluting soil, which is applied in the fields of organic high-sulfur stabilizers and high-sulfur reagents, can solve the problems of chromium slag not being disposed of in a timely and effective manner, large-scale engineering application restrictions, and high price of sodium dithionite, etc., and achieve reduction and repair efficiency High, guaranteed reduction efficiency, and the effect of reducing the content of hexavalent chromium

Inactive Publication Date: 2019-12-20
长沙工研院环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the middle of the 20th century, the chromium salt production industry developed rapidly, but due to backward technology and weak awareness of environmental protection, the chromium slag produced was not disposed of in a timely and effective manner, and a large amount of accumulated chromium slag was mostly in a disorderly pile
However, the price of sodium dithionite is relatively high, and large-scale engineering applications are limited; stabilizers such as sodium sulfide and sodium pyrosulfite are easy to oxidize and decompose in the natural environment, which is not conducive to the effective control of the reaction

Method used

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  • Organic high-sulfur stabilizer and synthesis method thereof, and applications in remediation of heavy metal contaminated soil
  • Organic high-sulfur stabilizer and synthesis method thereof, and applications in remediation of heavy metal contaminated soil
  • Organic high-sulfur stabilizer and synthesis method thereof, and applications in remediation of heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh 180g of elemental sulfur powder, fully grind, pass through a 20-mesh sieve, add 25g of ethanol solution, stir quickly and evenly, and let it stand for use. Weigh 300g of sodium sulfide solid (60% active ingredient of industrial sodium sulfide) and add it to the container containing elemental sulfur, stir fully, add 600g of water after stirring evenly, use mechanical stirring, the speed is set at 100r / min, add 40L The polysaccharide solution with a concentration of 10g / L, and then continue to stir. After observing that the yellow elemental sulfur in the liquid has fully reacted, add 100L of PAM solution with a concentration of 1g / L, stir slowly, and let it stand for one hour. After observing the obvious stratification of the liquid, slowly pour the upper liquid into the suction filter and perform suction filtration to obtain a ruby-colored clear organic high-sulfur stabilizer product with an effective sulfide content of about 26%. The whole preparation time is one h...

Embodiment 2

[0048] Weigh 150g of elemental sulfur powder, fully grind, pass through a 20-mesh sieve, add 25g of ethylene glycol solution, stir quickly and evenly, and let it stand for use. Weigh 280g of sodium sulfide solid (industrial sodium sulfide active ingredient 60%) and add it to the container containing elemental sulfur, stir fully, add 550g of water after stirring evenly, use mechanical stirring, the speed is set at 100r / min, add 40L Carboxylate sugar solution with a concentration of 10g / L, and then continue to stir. After observing that the yellow elemental sulfur in the liquid has fully reacted, add 120L of PAM solution with a concentration of 1g / L, stir slowly, and let it stand for one hour. After observing the obvious stratification of the liquid, slowly pour the upper liquid into the suction filter and perform suction filtration to obtain a ruby-colored clear organic high-sulfur stabilizer product with an effective sulfide content of about 24.6%. The whole preparation time is...

Embodiment 3

[0050] Weigh 200g of elemental sulfur powder, fully grind, pass through a 20-mesh sieve, add 20g of ethanol solution and 10g of ethylene glycol solution, stir quickly and evenly, and let it stand for use. Weigh 280g of sodium sulfide solid (60% active ingredient of industrial sodium sulfide) and add it to the container containing elemental sulfur, stir fully, add 600g of water after stirring evenly, use mechanical stirring, the speed is set at 100r / min, add 50L Polysaccharide solution with a concentration of 10g / L, and then continue to stir. After the yellow elemental sulfur in the liquid is fully reacted, add 100L of aluminum sulfate solution with a concentration of 1g / L, stir slowly, and let it stand for one hour. After observing the obvious stratification of the liquid, slowly pour the upper liquid into the suction filter and perform suction filtration to obtain a ruby-colored clear organic high-sulfur stabilizer product with an effective sulfide content of about 26.7%. The ...

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Abstract

The invention discloses an organic high-sulfur stabilizer and a synthesis method thereof, and applications in remediation of heavy metal contaminated soil. The preparation method comprises: uniformlymixing elemental sulfur, a cosolvent, an alkali metal sulfide, a catalyst and a solvent, carrying out a stirring reaction, adding a flocculant, and carrying out precipitation and impurity removing toobtain the organic high-sulfur stabilizer with high sulfur content and high stability. According to the present invention, with the application of the organic high-sulfur stabilizer in remediation ofheavy metal contaminated soil, high-valence heavy metals in soil can be efficiently reduced, and particularly the hexavalent chromium reducing stabilization effect is good; and compared with the commonly-used calcium polysulfide, sodium sulfide and other sulfur-based agents in the prior art, the organic high-sulfur stabilizer can substantially reduce the consumption of vulcanizing agents and reduce the remediation cost of heavy metal contaminated soil.

Description

technical field [0001] The present invention relates to a high-sulfurization reagent, in particular to an organic high-sulfur stabilizer that can be used to restore and restore heavy metals in heavy metal-contaminated soil, and also relates to its preparation method and application in heavy metal-contaminated soil restoration, which belongs to heavy metal-contaminated soil restoration technology field. Background technique [0002] In the middle of the 20th century, the chromium salt production industry developed rapidly. However, due to backward technology and weak environmental protection awareness, the chromium slag produced was not disposed of in a timely and effective manner. It was not until 2010 that the historical stockpiled chromium slag was disposed of, but the large amount of chromium-contaminated sites left still poses a huge threat to the environment and human health. [0003] In chromium-contaminated soil, hexavalent chromium exists not only on the surface of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02C01B17/34
CPCC01B17/34C09K17/02
Inventor 韩宝禄缪书舟刘卫国史学峰
Owner 长沙工研院环保有限公司
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