Attapulgite-based soil heavy metal repairing agent

Abstract

The invention belongs to the technical field of environment pollution treatment, and more specifically relates to a heavy metal-polluted soil repairing agent prepared by attapulgite. The attapulgite-based soil heavy metal repairing agent is obtained by steps of raw ore fragmentation, acidifying treatment, airing screening, roasting and soil heavy metal restoration. According to the attapulgite-based soil heavy metal repairing agent through acidifying and heat modification, attapulgite clay has characteristics of large specific surface area and high porosity amount due to sulfuric acid acidifying treatment of the attapulgite clay, activity and adsorptivity are increased, proportion of soluble heavy metals in the soil can be effectively reduced, soil heavy metal passivation effect can be reached, and soil heavy metal pollution can be remediated.

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...

Examples

Embodiment Construction

[0029] The present invention will be further described below in conjunction with embodiment:

[0030] 1. An attapulgite-based soil heavy metal remediation agent, characterized in that it comprises the following preparation steps:

[0031] A. Raw ore crushing

[0032] Crushing the attapulgite ore, the crushing mesh is 30 mesh-60 mesh;

[0033] B. Acidification treatment

[0034] 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;

[0035] C. Drying and sieving

[0036] 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;

[0037] D. Baking

[0038] Send the screened attapulgite pow...

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...

Examples

Embodiment Construction

[0029] The present invention will be further described below in conjunction with embodiment:

[0030] 1. An attapulgite-based soil heavy metal remediation agent, characterized in that it comprises the following preparation steps:

[0031] A. Raw ore crushing

[0032] Crushing the attapulgite ore, the crushing mesh is 30 mesh-60 mesh;

[0033] B. Acidification treatment

[0034] 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;

[0035] C. Drying and sieving

[0036] 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;

[0037] D. Baking

[0038] Send the screened attapulgite pow...

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