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Chemical fixing material suitable for arsenic in soil and application thereof

A chemical immobilization and soil technology, applied in the restoration of polluted soil, etc., can solve the problems of access, food safety, high energy consumption, etc., and achieve the effect of reducing cost and good use effect

Inactive Publication Date: 2010-04-21
广西聚缘农业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The biggest problem with the above-mentioned bioremediation methods is that the restoration efficiency is not high, and the restoration is greatly affected by environmental and climatic conditions. At the same time, the arsenic absorbed by plants may enter the food chain, causing food safety problems
The laws of physics consume a lot of energy and destroy soil structure and fertility
In addition, most methods are not suitable for the remediation of arsenic pollution in farmland soil, because the implementation of these remediation technologies will compete with crops for land and affect agricultural production.

Method used

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  • Chemical fixing material suitable for arsenic in soil and application thereof
  • Chemical fixing material suitable for arsenic in soil and application thereof
  • Chemical fixing material suitable for arsenic in soil and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A chemical fixation material for soil arsenic, the composition by weight is as follows:

[0060] Based on the dry basis of the finished product as 200kg:

[0061] Sharp titanium dioxide, nano material 120kg;

[0062] Rutile titanium dioxide, nano material 40kg;

[0063] Zero-valent iron powder, 90% over 100 mesh, 30kg;

[0064] Tree sawdust or straw powder 0kg.

[0065] Prepare according to the following steps: mix nano-sharp titanium dioxide, nano-rutile titanium dioxide and zero-valent iron powder with a powder mixer for 5 to 10 minutes according to the formula to obtain material 1; under stirring conditions (do not add tree sawdust to material 1 or straw powder) to obtain the chemical immobilization material of the present invention.

[0066] The material prepared in this embodiment can reduce the available arsenic in calcareous soil by 87.6% in 120 days under laboratory conditions (see figure 2 ), so that the available arsenic in red and yellow soil decreased ...

Embodiment 2

[0068] According to the preparation method of embodiment 1, the present embodiment is wherein another optimized formula, and the components by weight are as follows:

[0069] Sharp titanium dioxide, nano material 130kg;

[0070] Rutile titanium dioxide, nano material 30kg;

[0071] Zero-valent iron powder, 90% over 100 mesh, 30kg;

[0072] Tree sawdust or straw powder 10kg.

[0073] The chemical immobilization material prepared in this embodiment, under laboratory conditions, can make calcareous soil available arsenic drop by 87.6% in 120 days (see figure 2 ), so that the available arsenic in red and yellow soil decreased by 86.4% (see image 3 ); within a growing season, the content of arsenic in the shoots of Chinese cabbage (vegetables), wheat seedlings and rape seedlings is reduced by 84%, 86%, and 96% respectively, reaching the level required by pollution-free agricultural products (referring to Figure 4 ).

Embodiment 3

[0075] The present embodiment is the best implementation mode of the present invention, according to the preparation method of embodiment 1, its formula by weight component is as follows:

[0076] Based on the dry basis of the finished product as 200kg:

[0077]Sharp titanium dioxide, nano material 145kg;

[0078] Rutile titanium dioxide, nano material 30kg;

[0079] Zero-valent iron powder, 90% over 100 mesh, 20kg;

[0080] Tree sawdust or straw powder 5kg.

[0081] The chemical fixation material prepared by the present embodiment can reduce the available arsenic in calcareous soil by 90.6% in 120 days under laboratory conditions (see figure 2 ), reducing the available arsenic in red-yellow soil soil by 80.2% (see image 3 ); within a growing season, the content of arsenic in the shoots of Chinese cabbage (vegetables), wheat seedlings and rape seedlings is reduced by 86%, 95%, and 95% respectively, reaching the level required by pollution-free agricultural products (see ...

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Abstract

The invention belongs to the technical field of remediation of pollution of arsenic in soil, arsenic in sediment and arsenic in tailings, also relates to the technical field of agriculture environmental protection, in particular to a chemical fixing material suitable for remediation of pollution of arsenic in soil, arsenic in sediment and arsenic in tailings, and a preparation method and application thereof. The chemical fixing material prepared can effectively fix the arsenic in arsenic-polluted soil, arsenic-polluted sediment, arsenic-polluted tailings and the like, reduce the bioavailability of the arsenic, and inhibit crops from absorbing and accumulating the arsenic. The chemical fixing material for the arsenic is characterized in that: 200kg of dry basis of a finished product comprises the following compositions by weight: 120 to 145kg of nano-grade anatase titanium dioxide, 30 to 40kg of nano-grade rutile titanium dioxide, and 20 to 30kg of zero-valent iron powder (of which 90 percent passes through a 100-mesh sieve); and 0 to 10kg of tree saw dust or stalk powder is added or not added so as to prepare the chemical fixing material. The invention also discloses the preparation method and the application of the material.

Description

technical field [0001] The invention belongs to the technical field of remediation of soil heavy metal pollution, and specifically relates to the preparation and use of a soil arsenic pollution remediation chemical material. The material of the invention can fix arsenic to solid pollutants such as arsenic-contaminated soil, including arsenic-contaminated farmland soil and arsenic-contaminated sediments, reduce the bioavailability of arsenic, reduce the absorption and accumulation of arsenic by crops, and ensure the safety of agricultural products. technical background [0002] Of the 1.8 billion mu of cultivated land in my country, 300 million mu is polluted by heavy metals. Due to the exploitation of arsenic-contaminated groundwater, the use of arsenic-containing pesticides, sewage irrigation, mine development and metal smelting, a large number of cultivated lands in my country have been seriously polluted by arsenic. According to statistics, more than 50 million people in...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 涂书新张敏廖晓勇阎秀兰马琳曹环黄永柄
Owner 广西聚缘农业有限公司
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