A new type of soil heavy metal fixative and its preparation method and application

A fixative and heavy metal technology, applied in the field of soil remediation, can solve problems such as poor fixation effect, short lasting passivation time, and large soil disturbance

Active Publication Date: 2021-01-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main problems of traditional soil heavy metal fixatives are large soil disturbance, high price, poor fixation effect, and short lasting passivation time.

Method used

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  • A new type of soil heavy metal fixative and its preparation method and application
  • A new type of soil heavy metal fixative and its preparation method and application
  • A new type of soil heavy metal fixative and its preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0114] The present invention also provides a kind of preparation method of described fixing agent, comprises the steps:

[0115] (1) Provide component A and component B, wherein,

[0116] Component A is biomass power plant ash particles;

[0117] Component B is phosphate;

[0118] (2) under stirring conditions, adding the component B into water to obtain a phosphate solution;

[0119] (3) under stirring conditions, the component A is mixed with the phosphate solution obtained in step (2) to obtain the first mixed solution;

[0120] (4) Treating the first mixed solution obtained in step (3) at a certain temperature to obtain the fixative.

[0121] In another preferred example, the step (4) is carried out under airtight conditions.

[0122] In another preference, the step (4) includes:

[0123] (4-1) Seal the first mixed solution obtained in step (3) in the inner tank of the autoclave, and heat it to the first treatment temperature to obtain the fixative.

[0124] (4-2) He...

Embodiment 1

[0155] Embodiment 1 Fixative 1

[0156] Dissolve 2 g of disodium hydrogen phosphate powder in 80 mL of aqueous solution, add 10 g of biomass power plant ash into the disodium hydrogen phosphate solution under stirring conditions, and stir well. Pour the mixed solution into a 100mL autoclave liner (the maximum pressure of the laboratory hydrothermal kettle is generally 3MpaG, and the maximum filling degree is generally ≤ 80%, that is, 80mL liquid, which can be guaranteed under the safe pressure of the kettle in this embodiment), and seal , placed in an electric oven and heated at 180°C for 10 hours, filtered and washed the residue in the kettle after the reaction, and dried at 40°C to obtain Fixative 1.

[0157] result

[0158] Conduct EDS, FT-IR, TEM and XRD tests on the biomass power plant ash used.

[0159] FT-IR, TEM and XRD tests were carried out on the obtained fixative.

[0160]figure 1 It is the EDS collection of illustrative plates of the biomass power plant ash use...

Embodiment 2

[0167] Embodiment 2 Fixative 2

[0168] Same as Example 1, except that disodium hydrogen phosphate is replaced by dipotassium hydrogen phosphate to obtain fixative 2.

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Abstract

The invention provides a novel soil heavy metal fixing agent, and a preparation method and application thereof. The method comprises the following steps: providing a component A, a component B and water, wherein the component A is biomass power plant ash particles, and the component B is phosphate(s); and performing treatment under high-pressure hydrothermal conditions to obtain the fixing agent. The preparation method has the advantages of simple technique and low cost, is convenient to implement and popularize in large scale, and can be used for efficiently and enduringly fixing copper, cadmium, mercury, lead, chromium and other heavy metals in the soil.

Description

technical field [0001] The invention relates to the field of soil restoration, in particular, the invention relates to a novel soil heavy metal fixative and its preparation method and application. Background technique [0002] Soil health is the prerequisite and guarantee for sustainable agricultural development. At present, the heavy metal pollution of soil in my country is very serious. According to incomplete statistics, the cultivated land polluted by heavy metals such as cadmium, arsenic, lead, chromium and mercury is about 10 million hectares, accounting for 8.3% of the 120 million hectares of cultivated land. [0003] Soil heavy metal immobilization technology is an effective method to control heavy metal polluted soil at present. The immobilization technology refers to the addition of soil amendments to change the physical and chemical properties of the soil, and to change the presence of heavy metals in the soil through the adsorption, precipitation or co-precipitat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/02B09C1/08C09K101/00C09K109/00
CPCB09C1/08C09K17/02C09K2101/00C09K2109/00
Inventor 吴爱国刘弘禹张玉杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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