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Heavy metal cadmium and arsenic combined contaminated soil remediation agent and preparation method thereof

A soil remediation and complex pollution technology, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of heavy metal activation, reduce the pH value of the sediment, and reduce the pH value with simple operation steps Effect

Active Publication Date: 2019-05-17
GUANGDONG KAIYUAN ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the remediation of complex pollution caused by the coexistence of various heavy metals in soil mainly focuses on chemical passivation. According to research, cadmium ions in heavy metals are alkaline stable, and arsenic acid ions are acid stable. If arsenic is stable in soil At the same time, it may lead to the activation of other heavy metals

Method used

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  • Heavy metal cadmium and arsenic combined contaminated soil remediation agent and preparation method thereof
  • Heavy metal cadmium and arsenic combined contaminated soil remediation agent and preparation method thereof
  • Heavy metal cadmium and arsenic combined contaminated soil remediation agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] A heavy metal cadmium, arsenic compound polluted soil remediation agent, characterized in that: the agent includes the following raw materials in parts by weight:

[0032]

[0033] The cement is composite Portland cement, and the content of silicate in the composite Portland cement is 25%; the lime is ground to obtain a solid powder with a particle size of less than 2mm.

[0034] The auxiliary repair material is a polymeric iron-aluminum compound.

[0035] The preparation of described fulvic acid comprises the steps:

[0036] 1) The raw material lignite is crushed until the particle size is less than 75 mesh, the temperature of adding water is 40°C warm water, and the constant temperature time is 20min;

[0037] 2) After the constant temperature is over, stir slowly and add H 2 0 2 , H 2 0 2 The weight ratio of lignite to lignite is 1:0.6, after adding H 2 0 2 Afterwards, stir for 20min, stand still;

[0038] 3) Use a solid-liquid separator to conduct prelimina...

Embodiment 2

[0044] A heavy metal cadmium, arsenic compound polluted soil remediation agent, characterized in that: the agent includes the following raw materials in parts by weight:

[0045]

[0046] The cement is composite Portland cement, and the content of silicate in the composite Portland cement is 29%; the lime is ground to obtain a solid powder with a particle size of less than 2mm.

[0047] The auxiliary restoration material is an iron-based compound; the iron-based compound is at least one of ferric sulfate, ferric chloride and ferric nitrate.

[0048] The preparation of described fulvic acid comprises the steps:

[0049] 1) Pulverize the lignite raw material until the particle size is less than 75 mesh, add water at 45°C warm water, and keep the temperature for 23 minutes;

[0050] 2) After the constant temperature is over, stir slowly and add H 2 0 2 , H 2 0 2 The weight ratio of lignite to lignite is 1:0.7, after adding H 2 0 2 After that, stir for 23min, stand still...

Embodiment 3

[0057] A heavy metal cadmium, arsenic compound polluted soil remediation agent, characterized in that: the agent includes the following raw materials in parts by weight:

[0058]

[0059] The cement is composite Portland cement, and the content of silicate in the composite Portland cement is 33%; the lime is ground to obtain a solid powder with a particle size of less than 2mm.

[0060] The auxiliary restoration material is a mixture of ferric sulfate and ferric chloride in a weight ratio of 1:1.2.

[0061] The preparation of described fulvic acid comprises the steps:

[0062] 1) The raw material lignite is crushed until the particle size is less than 75 mesh, the temperature of adding water is 50°C warm water, and the constant temperature time is 25 minutes;

[0063] 2) After the constant temperature is over, stir slowly and add H 2 0 2 , after adding H 2 0 2 after H 2 0 2 The weight ratio of lignite to lignite is 1:0.8, stirred for 25min, and allowed to stand;

[...

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Abstract

The invention relates to the technical field of soil remediation agents, in particular to a heavy metal cadmium and arsenic combined contaminated soil remediation agent and a preparation method thereof. The remediation agent is prepared from raw materials in parts by weight as follows: 5-20 parts of cement, 5-15 parts of lime, 5-20 parts of an auxiliary remediation material, 8-15 parts of fulvic acid and 15-30 parts of bentonite. The preparation method of the remediation agent is simple and easy to operate, mass production can be realized, a small quantity of remediation agent is used during soil remediation, soil structures and properties are not affected, Fe<3+> in a used Fe-based compound can be subjected to a reaction with OH- in water to produce Fe(OH)3, activation of arsenic acid ions due to high pH value of soil after immobilization is inhibited, so that pH value of sediment and leaching of arsenic after soil passivation are reduced, and the remediation agent has long-acting stability and can make pH value of the soil weakly alkaline.

Description

technical field [0001] The invention relates to the technical field of soil remediation agents, in particular to a heavy metal cadmium and arsenic compound polluted soil remediation agent and a preparation method thereof. Background technique [0002] With the continuous acceleration of my country's industrialization process, the discharge of industrial wastewater, the unreasonable use of urban domestic sewage, pesticides and fertilizers containing heavy metals, and the atmospheric deposition caused by human activities have caused serious soil pollution. According to the Ministry of Environmental Protection and the Ministry of Land and Resources According to the "National Soil Pollution Survey Bulletin" released in 2017, the overall soil environment in the country is not optimistic. Some areas have serious soil pollution, the soil environment quality of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland are prominent. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C09K109/00
Inventor 吴兆峰魏伟周普雄余勇梁锦棠
Owner GUANGDONG KAIYUAN ENVIRONMENT TECH
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