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Remediation agent for cadmium and arsenic polluted soil

A soil remediation agent, arsenic pollution technology, applied in the restoration of polluted soil, soil conditioning materials, organic fertilizers, etc., can solve problems such as the imbalance of microbial distribution, and achieve inhibition of harmful microorganisms, reduction of back dissolution, and reduction of particle surface charge. Effect

Active Publication Date: 2020-01-10
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] Described tensio-active agent comprises by its weight: 36 parts of bonding materials, 9 parts of active materials, 6 parts of activators;

[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...

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]Described tensio-active agent comprises by its weight: 30 parts of binding materials, 5 parts of active materials, 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 car...

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] Described tensio-active agent comprises by its weight: 33 parts of bonding materials, 7 parts of active materials, 4 parts of activators;

[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 s...

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PUM

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Abstract

The invention belongs to the technical field of soil remediation agents, and particularly relates to a cadmium-arsenic polluted soil remediation agent which is prepared by taking manganese ore slag and goethite slag for mixing and then crushing to pass through a 200-mesh sieve to obtain mixed powder; calcining the mixed powder to a molten state, adding a surfactant with the mount of 15-20% of themixed powder for heat preservation treatment for 20-30 min, cooling to normal temperature, and performing flash explosion treatment and passivation treatment to obtain the product. The cadmium-arsenicpolluted soil remediation agent can effectively repair cadmium-arsenic polluted soil, has the function of inhibiting harmful microorganisms, and also has the function of preventing heavy metal from dissolving back. The goethite and manganese ore slag are used as curing agents for cadmium and arsenic, so that ion mobility and back dissolution are reduced, and the curing effect is improved; by adding the surfactant in the molten state, the specific surface area is increased, and the adsorption capacity for the cadmium and arsenic in the soil is improved, so that the cadmium and arsenic in the soil can enter crystal lattices.

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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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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