Lead contaminated soil repair agent and preparation method and application thereof

A technology for lead-contaminated soil and remediation agent, applied in the field of pollution treatment, can solve the problems of loss of nutrients, damage to soil structure, low remediation efficiency, etc., and achieve the effects of remediating soil fertility, improving ecological environment, and reducing leaching rate

Inactive Publication Date: 2017-05-24
产俊涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the remediation technologies for hexavalent lead-contaminated soil mainly include immobilization / stabilization, leaching method, soil washing method, electrokinetic remediation method, chemical reduction method, phytoremediation, and microbial remediation. The overall remediation efficiency is low and the treatment cost is high. question
Traditional remediation methods such as landfill, leaching, electrochemistry, etc. have a large amount of engineering, high cost, and often lead to soil structure damage and loss of some nutrients

Method used

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  • Lead contaminated soil repair agent and preparation method and application thereof

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Comparison scheme
Effect test

Embodiment 1

[0020] In the embodiment of the present invention, a lead-contaminated soil remediation agent is made of the following raw materials in terms of parts by mass: 88 parts of plant ash, 23 parts of Yu Yuliang, 14 parts of calcium silicate, 18 parts of potassium phosphate, and 27 parts of calcium magnesium phosphate fertilizer. share.

[0021] The preparation method of described lead-contaminated soil remediation agent, comprises the following steps:

[0022] (1) Pulverize plant ash and Yu surplus grain into powder respectively, pass through a 200-mesh sieve, and dry to obtain plant ash powder and Yu surplus grain powder for subsequent use;

[0023] (2) Mix plant ash powder and Yuyu grain powder in proportion, place them in a nitric acid solution with a mass concentration of 3.8 times the mass of the sum, soak for 1 hour, and filter to obtain mixture A;

[0024] (3) Mix mixture A and calcium silicate uniformly in proportion, then transfer it into a non-metallic container, place i...

Embodiment 2

[0027] In the embodiment of the present invention, a lead-contaminated soil remediation agent is made of the following raw materials in terms of parts by mass: 100 parts of plant ash, 28 parts of Yu Yuliang, 19 parts of calcium silicate, 24 parts of potassium phosphate, 36 parts of calcium magnesium phosphate fertilizer share.

[0028] The preparation method of described lead-contaminated soil remediation agent, comprises the following steps:

[0029] (1) Pulverize plant ash and Yu surplus grain into powder respectively, pass through a 250-mesh sieve, and dry to obtain plant ash powder and Yu surplus grain powder for subsequent use;

[0030] (2) Mix plant ash powder and Yuyu grain powder in proportion, place them in a nitric acid solution with a mass concentration of 13% that is 4.4 times the sum of their masses, soak for 2 hours, and filter to obtain mixture A;

[0031] (3) Mix mixture A and calcium silicate uniformly in proportion, then transfer it into a non-metallic conta...

Embodiment 3

[0034] In the embodiment of the present invention, a lead-contaminated soil remediation agent is made of the following raw materials in terms of parts by mass: 92 parts of plant ash, 24 parts of Yu surplus grain, 15 parts of calcium silicate, 20 parts of potassium phosphate, 30 parts of calcium magnesium phosphate fertilizer share.

[0035] The preparation method of described lead-contaminated soil remediation agent, comprises the following steps:

[0036] (1) Pulverize plant ash and Yu surplus grain into powder respectively, pass through a 200-mesh sieve, and dry to obtain plant ash powder and Yu surplus grain powder for subsequent use;

[0037] (2) Mix plant ash powder and Yuyu grain powder in proportion, place them in a nitric acid solution with a mass concentration of 3.8 times the sum of their masses, soak for 2 hours, and filter to obtain mixture A;

[0038] (3) Mix mixture A and calcium silicate uniformly in proportion, then transfer it into a non-metallic container, p...

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Abstract

The invention discloses a lead contaminated soil repair agent and a preparation method and an application thereof; the soil repair agent is prepared from the following raw materials in parts by mass: 88-100 parts of plant ash, 23-28 parts of limonitum, 14-19 parts of calcium silicate, 18-24 parts of potassium phosphate, and 27-36 parts of a calcium magnesium phosphate fertilizer, wherein the mass ratio of potassium phosphate to the calcium magnesium phosphate fertilizer is 2 to 3. The preparation method comprises the steps: respectively crushing plant ash and limonite, sieving, drying, mixing, placing in a nitric acid solution, carrying out soaking treatment, and filtering to obtain a mixture A; and mixing the mixture A with calcium silicate evenly, then placing in a microwave field, carrying out microwave heating treatment to obtain a mixture B, washing cleanly, drying, mixing the obtained mixture B with potassium phosphate and the calcium magnesium phosphate fertilizer, and packing to obtain the product. The lead contaminated soil repair agent has excellent efficacies of fixing chromium and repairing the soil fertility, so the leaching rate of chromium metals in soil is significantly reduced, and reaches and is superior to primary standard of national 'soil environmental quality standard' (GB15618-1995).

Description

technical field [0001] The invention relates to the technical field of pollution treatment, in particular to a lead-contaminated soil remediation agent and its preparation method and application. Background technique [0002] At present, the area of ​​heavy metal polluted soil in China is at least 20 million hectares. Heavy metal pollution comes from a wide range of sources, such as unreasonable discharge of "three wastes" in mineral processing and smelting, electroplating, batteries, chemicals, dyes and other industries, sewage irrigation, sludge fertilization, and urban transportation. Vehicle exhaust emissions, improper disposal of electronic waste, etc., will lead to heavy metal pollution in the soil. Soil heavy metal pollution has the characteristics of poor mobility, long residence time, and irreversibility of pollutants in the soil, resulting in decreased soil fertility, reduced crop yield and quality, and polluted groundwater and surface water through runoff and leac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C05G3/04C05G3/80
CPCC05B7/00C05G3/80C09K17/40C09K2101/00C05B17/00C05D1/00C05D3/00C05F11/00
Inventor 不公告发明人
Owner 产俊涛
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