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Attapulgite-based organic soil conditioner

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

Inactive Publication Date: 2018-12-18
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 existing heavy metal-contaminated soil remediation technology and materials, and provide a low-cost, good-effect, environment-friendly and widely used attapulgite-based organic soil conditioner

Method used

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  • Attapulgite-based organic soil conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] An attapulgite-based organic soil conditioner, comprising the following preparation steps:

[0062] A. Raw ore crushing

[0063] Crush the attapulgite ore and eggshell, the broken mesh is 30 mesh-60 mesh;

[0064] B. Acidification treatment

[0065] 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;

[0066] C. Drying and sieving

[0067] 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;

[0068] D. Baking

[0069] 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 45-12...

Embodiment 2

[0077] An attapulgite-based organic soil conditioner, comprising the following preparation steps:

[0078] A. Raw ore crushing

[0079] Crush the attapulgite ore and eggshell, the crushing mesh number is 30 mesh-60 mesh;

[0080] B. Acidification treatment

[0081] 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;

[0082] C. Drying and sieving

[0083] 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;

[0084] D. Baking

[0085] Send the screened attapulgite powder into a roasting furnace for roasting, the roasting temperature is controlled at 300-360°C, and the roasting time...

Embodiment 3

[0095] An attapulgite-based organic soil conditioner, comprising the following preparation steps:

[0096] A. Raw ore crushing

[0097] Crush the attapulgite ore and eggshell, the broken mesh is 30 mesh-60 mesh;

[0098] B. Acidification treatment

[0099] 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;

[0100] C. Drying and sieving

[0101] 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;

[0102] D. Baking

[0103] 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 45-12...

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Abstract

The invention belongs to the technical field of environmental pollution treatment and particularly relates to a heavy metal contaminated soil repairing agent prepared from attapulgite. The attapulgite-based organic soil conditioner is obtained through raw ore crushing, acidification, airing in sun, screening, baking and soil heavy metal repair. Through sulfuric acid acidification of attapulgite clay, the attapulgite-based heavy metal contaminated soil repairing agent subjected to acidification and thermal modification has the characteristics of large specific surface area and high porosity, has high activity and adsorption performances, effectively reduces the ratio of soluble heavy metals in soil, realizes soil heavy metal passivation and can repair heavy metal contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and in particular relates to the preparation of an attapulgite-based organic soil conditioner by using an attapulgite. 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, thereby enda...

Claims

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Application Information

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IPC IPC(8): C09K17/08
CPCC09K17/08
Inventor 任珺陶玲刘依琳张雪彬张倩
Owner LANZHOU KUNLUN ENVIRONMENTAL PROTECTION TECH
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