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Targeted stabilizer for repairing heavy metal contaminated soil and preparation method thereof

A technology of polluted soil and heavy metal trapping agent, applied in the direction of soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve soil secondary pollution, high lead availability and mobility, soil pH and conductivity increase, etc. problems, to achieve the effect of no secondary pollution, enhanced selectivity, and low price

Active Publication Date: 2014-04-09
CECEP L&T ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Invention patent (CN102240668A) discloses a method for stabilizing lead by using water-washed briquette ash in lead-contaminated soil, involving a method for stabilizing lead in lead-contaminated soil and a method for utilizing briquette to burn solid waste, which solves the problem of lead-contaminated soil Medium lead has high availability and mobility issues, and the application of honeycomb ash slag leads to the increase of soil pH and electrical conductivity
[0007] The invention patent (CN102233354A) discloses a treatment method for remediating arsenic-contaminated soil. The activated red mud stabilizer is prepared by activating iron salt and ferrous salt. Since red mud contains a variety of trace radioactive substances and strong alkaline chemical Substances that will cause secondary pollution of the soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Grind bentonite and struvite, pass through a 300-mesh sieve, and set aside; weigh 200g of bentonite, 500g of struvite, 200g of iminodiacetic acid, and 100g of carboxymethyl cellulose, and mix them evenly in a reaction kettle; add 200ml of 2mol / L Sodium hydroxide solution, heat the mixed material in a water bath at 80°C, react for 3 hours under full stirring to obtain a gel-like material; cool to room temperature, add 1mol / L hydrochloric acid to adjust the pH to neutral, and dry at 105°C for 24 hours ;Take out the dried targeted stabilizer and crush it into powder, the powder fineness is 300 mesh sieve; the powdered stabilizer obtained by drying is calcined at 200°C for 3h in a muffle furnace to obtain the targeted stabilizer Agent 1#. Mix 10g of stabilizer 1# with 1000g of heavy metal polluted soil evenly, and the weight ratio of stabilizer to polluted soil is 1:100. The concentrations of lead, zinc, copper and cadmium in the tested contaminated soil were 6482mg / kg, 41...

Embodiment 2

[0029] Grind bentonite and struvite, pass through a 300-mesh sieve, and set aside; weigh 300g of bentonite, 500g of struvite, 100g of diethylenetriaminepentaacetic acid, and 100g of polyvinyl alcohol, and mix them evenly in a reaction kettle; add 250ml of 2mol / L Sodium hydroxide solution, heat the mixed material in a water bath at 80°C, react for 3 hours under full stirring to obtain a gel-like material; cool to room temperature, add 1mol / L hydrochloric acid to adjust the pH to neutral, and dry at 105°C for 24 hours ;Take out the dried targeting stabilizer and crush it into powder with a fineness of 300 mesh sieve; put the dried powdered stabilizer in a muffle furnace and calcinate it at 300°C for 2 hours to obtain the targeted stabilizer Agent 2#. Mix 10g of stabilizer 2# with 1000g of heavy metal polluted soil evenly, and the weight ratio of stabilizer to polluted soil is 1:100. The concentrations of lead, zinc, copper and cadmium in the tested contaminated soil were 6482mg...

Embodiment 3

[0032] Grind bentonite and struvite, pass through a 300-mesh sieve, and set aside; weigh 400g of bentonite, 300g of struvite, 200g of diethyleneiminodiacetic acid, 50g of carboxymethyl cellulose, and 50g of polyvinyl alcohol, and mix them in a reaction kettle Uniform; add 300ml of 2mol / L sodium hydroxide solution, heat the mixed material in a water bath at 80°C, and react for 3 hours under full stirring to obtain a gel-like material; cool to room temperature, add 1mol / L hydrochloric acid to adjust the pH to neutral, at 105 Dry at ℃ for 24 hours; take out the dried targeted stabilizer and crush it into powder, the powder fineness is 300 mesh sieve; the powdered stabilizer obtained by drying is calcined in a muffle furnace at 250℃ 2h, the targeting stabilizer 3# was prepared. Mix 20g of stabilizer 3# with 1000g of heavy metal polluted soil evenly, and the weight ratio of stabilizer to polluted soil is 1:50. The concentrations of lead, zinc, copper and cadmium in the tested cont...

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PUM

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Abstract

The invention discloses a targeted stabilizer for repairing heavy metal contaminated soil and a preparation method thereof, and belongs to the technical fields of governing and repairing of heavy metal contaminated soil. The stabilizer is prepared from bentonite and struvite as main materials assisted by heavy metal chelate, and an organic binder as a skeleton. The targeted stabilizer comprises the following dry substances by weight percent: 20-40% of bentonite, 30-50% of struvite, 5-20% of heavy metal chelate and 5-10% of binder. The preparation technology of the targeted stabilizer comprises the steps of mixing, reacting, baking, crushing and calcining. By adopting the targeted stabilizer and the preparation method thereof, the pollution problem of the heavy metal contaminated soil can be effectively solved, the targeted stabilizer has the characteristics of being wide in material source, low in price, low in cost, high in remediation efficiency, free of secondary pollution, simple in operation method and the like.

Description

technical field [0001] The invention belongs to the technical field of treatment and restoration of heavy metal polluted soil, and relates to a targeting stabilizer for repairing heavy metal polluted soil and a preparation method thereof. Background technique [0002] Soil is one of the important natural resources that human beings rely on for survival, and it is also an important part of the human ecological environment. With the rapid development of industry and mining, soil heavy metal pollution has become increasingly serious. Heavy metals in polluted soil mainly include mercury, cadmium, lead, copper, chromium, arsenic, nickel, manganese, zinc, arsenic, etc. Heavy metal pollution has the characteristics of concealment, long-term and irreversible. In recent years, my country's soil heavy metal pollution has entered a concentrated and frequent period. According to data, the agricultural land area polluted by heavy metals in my country is about 15 million m 2 Every year,...

Claims

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Application Information

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IPC IPC(8): C09K17/50C09K17/48
Inventor 李萌张翔宇王浩李实邹正禹邹浩辰潘利祥杜昊林
Owner CECEP L&T ENVIRONMENTAL TECH
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