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A kind of cadmium arsenic contaminated soil remediation agent

A soil remediation agent and arsenic-contaminated technology, which is applied in the field of cadmium-arsenic contaminated soil remediation agent, can solve the problems of unbalanced distribution of microorganisms, achieve the effects of inhibiting harmful microorganisms, reducing the surface charge of particles, and increasing the specific surface area

Active Publication Date: 2021-04-13
铜仁市万山区植保植检站
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing technology, the use of modified biochar to control cadmium and arsenic pollution has achieved certain results, but biochar and carbon, nitrogen, and phosphorus modifiers have played a positive role in microbial activity, which can easily lead to unbalanced microbial distribution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A cadmium-arsenic polluted soil remediation agent, which is mixed with manganese slag and goethite slag and crushed to pass through a 200-mesh sieve to obtain a mixed powder; the mixed powder is calcined to a molten state, and 20% of the surface activity of the mixed powder is added After 30 minutes of heat-preservation treatment, cool down to room temperature, and undergo flash explosion treatment and passivation treatment to obtain it;

[0028] The surfactant comprises by weight: 36 parts of binding material, 9 parts of active material, 6 parts of activator;

[0029] The bonding material is composed of cement and glass fiber in a mass ratio of 1:9;

[0030] The active material is composed of the following materials in parts by weight: 5 parts of tricalcium aluminate, 11 parts of sodium thiosulfate, and 13 parts of sodium lignosulfonate;

[0031] The activator is composed of the following materials in parts by weight: 13 parts of urea, 7 parts of sodium carbonate, and...

Embodiment 2

[0039] A cadmium-arsenic polluted soil remediation agent, which is mixed with manganese slag and goethite slag and crushed to pass through a 200-mesh sieve to obtain a mixed powder; the mixed powder is calcined to a molten state, and 15% of the surface activity of the mixed powder is added After 20 minutes of heat preservation treatment, cool to room temperature, and undergo flash explosion treatment and passivation treatment to obtain it;

[0040]The surfactant comprises in parts by weight: 30 parts of bonding material, 5 parts of active material, and 1 part of activator;

[0041] The bonding material is composed of cement and glass fiber in a mass ratio of 1:5;

[0042] The active material is composed of the following materials in parts by weight: 1 part of tricalcium aluminate, 7 parts of sodium thiosulfate, and 5 parts of sodium lignosulfonate;

[0043] The activator is composed of the following materials in parts by weight: 10 parts of urea, 3 parts of sodium carbonate, ...

Embodiment 3

[0051] A cadmium-arsenic polluted soil remediation agent, which is mixed with manganese slag and goethite slag and crushed to pass through a 200-mesh sieve to obtain a mixed powder; the mixed powder is calcined to a molten state, and 18% of the surface activity of the mixed powder is added After 25 minutes of heat-preservation treatment, cool down to normal temperature, undergo flash explosion treatment and passivation treatment, and obtain it;

[0052] The surfactant comprises by weight: 33 parts of binding material, 7 parts of active material, 4 parts of activator;

[0053] The bonding material is composed of cement and glass fiber in a mass ratio of 1:7;

[0054] The active material is composed of the following materials in parts by weight: 3 parts of tricalcium aluminate, 9 parts of sodium thiosulfate, and 9 parts of sodium lignosulfonate;

[0055] The activator is composed of the following materials in parts by weight: 12 parts of urea, 5 parts of sodium carbonate, and 1...

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Abstract

The invention belongs to the technical field of soil remediation agents, and specifically relates to a cadmium-arsenic contaminated soil remediation agent, which is obtained by mixing manganese slag and goethite slag until passing through a 200-mesh sieve to obtain a mixed powder; calcining the mixed powder until it is melted State, after adding 15-20% surfactant of mixed powder and heat preservation treatment for 20-30min, cool to normal temperature, and get final product through flash explosion treatment and passivation treatment; the restoration agent of the present invention is effective for the soil polluted by cadmium and arsenic Restoration, but also has the function of inhibiting harmful microorganisms, and also prevents heavy metals from re-dissolving. Use goethite and manganese slag as solidifying agents for cadmium and arsenic to reduce ion mobility and resolvation, and improve solidification. By adding surfactants in the molten state, the specific surface area is increased and the resistance to cadmium and arsenic in the soil is increased. The adsorption capacity enables cadmium and arsenic in the soil to enter the lattice.

Description

technical field [0001] The invention belongs to the technical field of soil remediation agents, in particular to a cadmium and arsenic contaminated soil remediation agent. Background technique [0002] Tailings abandoned land, also known as tailings pool, is the most common and most difficult abandoned bare land in metal mines. It not only has serious heavy metal pollution itself, but also a long-lasting source of heavy metal pollution. Toxic and harmful substances in the tailings are easy to spread with rain and dust, polluting the surrounding soil, water and atmosphere, causing serious ecological and environmental problems, and even threatening the health of local people. [0003] The main elements that cause soil heavy metal pollution are Cd, Ni, As, Cu, Hg, Pb, Cr and Zn, and their point exceeding standard rates are 7.0%, 4.8%, 2.7%, 2.1%, 1.6%, 1.5%, 1.1%, respectively. % and 0.9%, heavy metals often exist in the form of compound, and the compound pollution of Cd-As is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/00C09K101/00
CPCB09C1/00B09C1/08C09K17/40C09K2101/00
Inventor 顾昌萍杨宝平
Owner 铜仁市万山区植保植检站
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