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Attapulgite-based soil heavy metal repair agent

A technology of attapulgite clay and attapulgite, applied in the field of environmental pollution control

Inactive Publication Date: 2018-11-02
LANZHOU KUNLUN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the existing heavy metal-contaminated soil remediation technology and materials, and provide a soil heavy metal remediation agent with low cost, good effect, environmental friendliness and wide application range

Method used

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  • Attapulgite-based soil heavy metal repair agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] An attapulgite-based soil heavy metal restoration agent, comprising the following preparation steps:

[0061] A. Raw ore crushing

[0062] Crushing the attapulgite ore, the crushing mesh is 30 mesh-60 mesh;

[0063] B. Acidification treatment

[0064] Concentrated sulfuric acid with a mass fraction of 98% was added to the water to prepare a sulfuric acid solution with a molar concentration of 1 to 3 mol / L, and the sulfuric acid solution was added to the attapulgite ore broken in step A, and acidified for 4 hours to make attapulgite clay;

[0065] C. Drying and sieving

[0066] Airing the acidified attapulgite clay, drying to reduce the water content of the attapulgite clay to 15%, then crushing and sieving to obtain attapulgite powder, the mesh size of the attapulgite is 100-150 mesh;

[0067] D. Baking

[0068] Send the screened attapulgite powder into a roasting furnace for roasting, the roasting temperature is controlled at 300-360°C, and the roasting time is 45-...

Embodiment 2

[0076] An attapulgite-based soil heavy metal restoration agent, comprising the following preparation steps:

[0077] A. Raw ore crushing

[0078] Crushing the attapulgite ore, the crushing mesh is 30 mesh-60 mesh;

[0079] B. Acidification treatment

[0080] Concentrated sulfuric acid with a mass fraction of 98% was added to the water to prepare a sulfuric acid solution with a molar concentration of 1 to 3 mol / L, and the sulfuric acid solution was added to the attapulgite ore broken in step A, and acidified for 4 hours to make attapulgite clay;

[0081] C. Drying and sieving

[0082] Airing the acidified attapulgite clay, drying to reduce the water content of the attapulgite clay to 15%, then crushing and sieving to obtain attapulgite powder, the mesh size of the attapulgite is 100-150 mesh;

[0083] D. Baking

[0084] Send the screened attapulgite powder into a roasting furnace for roasting, the roasting temperature is controlled at 300-360°C, and the roasting time is 45-...

Embodiment 3

[0094] An attapulgite-based soil heavy metal restoration agent, comprising the following preparation steps:

[0095] A. Raw ore crushing

[0096] Crushing the attapulgite ore, the crushing mesh is 30 mesh-60 mesh;

[0097] B. Acidification treatment

[0098] Concentrated sulfuric acid with a mass fraction of 98% was added to the water to prepare a sulfuric acid solution with a molar concentration of 1 to 3 mol / L, and the sulfuric acid solution was added to the attapulgite ore broken in step A, and acidified for 4 hours to make attapulgite clay;

[0099] C. Drying and sieving

[0100] Airing the acidified attapulgite clay, drying to reduce the water content of the attapulgite clay to 15%, then crushing and sieving to obtain attapulgite powder, the mesh size of the attapulgite is 100-150 mesh;

[0101] D. Baking

[0102] Send the screened attapulgite powder into a roasting furnace for roasting, the roasting temperature is controlled at 300-360°C, and the roasting time is 45-...

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Abstract

The invention belongs to the technical field of environmental pollution improvement, and particularly relates to a repair agent for soil polluted due to preparing heavy metal via utilizing attapulgite. An attapulgite-based soil heavy metal repair agent is prepared through multiple steps of raw ore breaking, acidizing, drying and sieving, roasting and soil heavy metal repair and the like. Accordingto the attapulgite-based soil heavy metal repair agent subjected to acidification and thermal modification, attapulgite clay is subjected to sulphuric acid acidizing and has the characteristics of large specific surface area and high porosity, both the activity and adsorptive property of the repair agent are relatively greatly improved, the proportion of soluble heavy metal in soil can be effectively lowered, the effect of passivating soil heavy metal is achieved, and the soil heavy metal pollution is repaired.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and in particular relates to the preparation of a restoration agent for heavy metal polluted soil by using attapulgite rods. Background technique [0002] With the rapid development of modern industry and agriculture, the problem of heavy metal pollution in the soil of industrial and agricultural land in my country is becoming more and more serious. At present, the area of ​​cultivated land polluted by heavy metals such as Cd, As, Cr, and Pb in my country is nearly 20 million hectares, accounting for about 1 / 5 of the total cultivated land area. Due to the characteristics of long-term, pervasive, concealed and refractory to natural digestion of heavy metal pollution, the treatment of heavy metal-contaminated soil is still a major problem in the world today. Soil heavy metal pollution will enter animals and humans through water, atmosphere and food chain circulation, thereb...

Claims

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Application Information

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IPC IPC(8): C09K17/08C09K101/00
CPCC09K17/08C09K2101/00
Inventor 任珺陶玲刘依琳杨宜珺张雪彬曹天轶
Owner LANZHOU KUNLUN ENVIRONMENTAL PROTECTION TECH
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