Heavy-metal solidification and stabilization chemical and use method thereof

A technology of heavy metals and pharmaceuticals, applied in the field of environmental protection and soil pollution control, can solve the problems of crop and groundwater safety threats, incomplete industrial waste treatment, technical process substandard, etc., to achieve no secondary pollution risk, solidification and stabilization time Fast and effective treatment

Inactive Publication Date: 2017-12-01
四川长虹格润环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, due to factors such as unsound environmental protection measures, substandard technical processes, and imperfect disposal of industrial waste, a large number of soil pollution has occurred, which threatens the safety of crops and groundwater and endangers human health.

Method used

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  • Heavy-metal solidification and stabilization chemical and use method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The Cd-contaminated soil in a metal-contaminated area was selected as the sample for this implementation, and the Cd concentration was 35.7mg / kg. The heavy metal solidifying and stabilizing agent (weight proportion is: Portland cement is 30%, fly ash is 20%, quicklime is 30%, hydroxyapatite is 10%, montmorillonite 10%) and water according to weight The ratio is 1:1, stirring and mixing; according to the proportion that the amount of heavy metal solidification and stabilization agent added is 6% of the sample mass percentage, it is added to the sample, mixed and stirred evenly, and left to stand for curing for 36 hours.

[0042] Samples were dried for analysis and determination. The leachate was obtained from the leaching experiment of the sample by the flipping leaching procedure, and the treated leachate was determined by flame atomic absorption spectrometry ("Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299—2007)).

[0043] Aft...

Embodiment 2

[0045] The Pb-contaminated soil of an industrial site was selected as the sample for this implementation, and the Pb concentration was 458mg / kg. The heavy metal solidifying and stabilizing agent (weight proportion is: Portland cement is 30%, fly ash is 15%, quicklime is 15%, hydroxyapatite is 20%, nano-montmorillonite 20%) and water according to The weight ratio is 1:1, stirring and mixing; according to the proportion that the heavy metal curing and stabilizing agent is 8% by mass of the sample, it is added to the sample, mixed and stirred evenly, and left to stand for 36 hours.

[0046] Samples were dried for analysis and determination. The leachate was obtained from the leaching experiment of the sample by the flipping leaching procedure, and the treated leachate was determined by flame atomic absorption spectrometry ("Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299—2007)).

[0047] After testing, the leaching concentration of heavy ...

Embodiment 3

[0049] The Zn-contaminated soil of an industrial site was selected as the sample for this implementation, and the Zn concentration was 2843.6mg / kg. The heavy metal solidifying and stabilizing agent (weight ratio is: Portland cement is 30%, fly ash is 15%, quicklime is 15%, hydroxyapatite is 30%, nano-montmorillonite 10%) and water according to The weight ratio is 1:1, stirring and mixing; according to the proportion that the heavy metal curing and stabilizing agent is 10% of the mass percentage of the sample, it is added to the sample, mixed and stirred evenly, and left to stand for 36 hours.

[0050] Samples were dried for analysis and determination. The leachate was obtained from the leaching experiment of the sample by the flipping leaching procedure, and the treated leachate was determined by flame atomic absorption spectrometry ("Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299—2007)).

[0051] After testing, the leaching concentra...

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Abstract

The invention discloses a heavy-metal solidification and stabilization chemical and a use method thereof, belongs to the technical field of soil pollution treatment in environmental protection, and aims to solve the technical problem by providing the heavy-metal solidification and stabilization chemical. The heavy-metal solidification and stabilization chemical comprises the following components by weight percent: 20-30% of portland cement, 15-30% of fly ash, 15-30% of quick lime, 10-30% of hydroxy calcium phosphate, 10-20% of montmorillonite and inevitable impurities, and the total mass percent of the components is 100%. The use method of the heavy-metal solidification and stabilization chemical comprises the following steps: mixing the heavy-metal solidification and stabilization chemical with water, performing stirring, adding the mixture into heavy-metal polluted soil, performing uniform mixing and stirring, and leaving to stand for maintenance. The heavy-metal solidification and stabilization chemical is low in cost, good in treatment effect, free from secondary pollution risks and suitable for treating single or compound heavy metal polluted soil and has favorable social and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and soil pollution control, and in particular relates to a heavy metal solidification and stabilization agent and a use method thereof. Background technique [0002] With the advancement of my country's industrial and agricultural modernization process, chemical industry, metallurgy, petroleum, transportation, fertilizer and other industries have developed rapidly. At the same time, due to factors such as inadequate environmental protection measures, substandard technical processes, and imperfect treatment of industrial waste, a large number of soil pollution has occurred, which poses a threat to the safety of crops and groundwater, and endangers human health. In 2014, the "National Survey Bulletin on Polluted Soil" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources showed that the total point exceeding the standard rate of soil in th...

Claims

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Application Information

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IPC IPC(8): C09K17/10
CPCC09K17/10
Inventor 魏兴刚
Owner 四川长虹格润环保科技股份有限公司
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