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Preparation method of Chine coal ash composite material for repairing farmland soil with excessive cadmium ions

A technology of composite materials and coal ash, which is applied in the field of Maogen coal ash composite material preparation, can solve the problem of small possibility of exceeding the standard, and achieve the effect of highlighting the substantive characteristics

Active Publication Date: 2018-01-12
TAICANG BIQI NEW MATERIAL RES & DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of excessive heavy metals in slag has never been considered in previous research, and the possibility of exceeding the standard is very small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Wash the chrysanthemum root with tap water and dry it.

[0018] Dissolve ammonia water, ethylenediamine, urea, and ammonium bicarbonate in deionized water. The concentration of ammonia water is 5g / L, the concentration of ethylenediamine is 5g / L, the concentration of urea is 5g / L, and the concentration of ammonium bicarbonate is 5g / L. Ammonia solution was obtained.

[0019] Put 50g of washed Chine root in 500mL ammoniated solution, place it at 70°C for 80 minutes, rinse and dry to obtain ammoniated Chine root.

[0020] Dissolve dodecylbenzenesulfonic acid and ammonium acetate in deionized water, the mass concentration of dodecylbenzenesulfonic acid is 5%, and the mass concentration of ammonium acetate is 5%, to obtain dodecylbenzenesulfonic acid / acetic acid ammonium mixed solution.

[0021] Put 100g of coal ash in 500mL dodecylbenzenesulfonic acid / ammonium acetate mixed aqueous solution, stir for 1 hour, filter, dry at 90°C for 1 hour, cool, wash with deionized water, ...

Embodiment 2

[0026] Wash the chrysanthemum root with tap water and dry it.

[0027] Dissolve ammonia water, ethylenediamine, urea, and ammonium bicarbonate in deionized water. The concentration of ammonia water is 10g / L, the concentration of ethylenediamine is 10g / L, the concentration of urea is 10g / L, and the concentration of ammonium bicarbonate is 10g / L. Ammonia solution was obtained.

[0028] Put 5 g of washed Chine root in 50 mL of ammoniated solution, place it at 70°C for 80 minutes, rinse and dry to obtain ammoniated Chine root.

[0029] Dissolve dodecylbenzenesulfonic acid and ammonium acetate in deionized water, the mass concentration of dodecylbenzenesulfonic acid is 10%, and the mass concentration of ammonium acetate is 10%, to obtain dodecylbenzenesulfonic acid / acetic acid ammonium mixed solution.

[0030] Put 10g of coal ash in 100mL dodecylbenzenesulfonic acid / ammonium acetate mixed aqueous solution, stir for 1 hour, filter, dry at 90°C for 1 hour, cool, wash with deionized...

Embodiment 3

[0035] Wash the chrysanthemum root with tap water and dry it.

[0036] Dissolve ammonia water, ethylenediamine, urea, and ammonium bicarbonate in deionized water. The concentration of ammonia water is 6g / L, the concentration of ethylenediamine is 7g / L, the concentration of urea is 8g / L, and the concentration of ammonium bicarbonate is 9g / L. Ammonia solution was obtained.

[0037] Put 50g of washed Chine root in 500mL ammoniated solution, place it at 70°C for 80 minutes, rinse and dry to obtain ammoniated Chine root.

[0038] Dissolve dodecylbenzenesulfonic acid and ammonium acetate in deionized water, the mass concentration of dodecylbenzenesulfonic acid is 6%, and the mass concentration of ammonium acetate is 9%, to obtain dodecylbenzenesulfonic acid / acetic acid ammonium mixed solution.

[0039]Put 100g of coal ash in 800mL of dodecylbenzenesulfonic acid / ammonium acetate mixed aqueous solution, stir for 1 hour, filter, dry at 90°C for 1 hour, cool, wash with deionized water...

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Abstract

The invention belongs to the field of soil restoration materials, and relates to a method for preparing a chamomile coal ash composite material for restoration of farmland soil with excessive cadmium ions. The preparation method proposed by the invention is to compound the modified coal ash into the pores of the ammoniated chrysanthemum root, and the specific process includes cleaning the chrysanthemum root, ammonification, modification of the coal ash slag, and preparation of composite materials. The chigen coal ash composite material prepared by the present invention has the following advantages: (1) the coal ash is fixed in the chigen with 3-aminopropyltrimethoxysilane, which can not only exert the characteristics of light density and large specific surface area of ​​the chigen, but also It can take advantage of the strong adsorption capacity of modified coal ash slag to heavy metal cadmium ions; (2) Compared with coal ash slag powder, the composite material avoids the problems of agglomeration and agglomeration of coal ash slag powder and reduced adsorption capacity of cadmium ions , and can avoid the difficult recovery of coal ash that adsorbs cadmium ions, causing the problem of secondary soil pollution; (3) Compared with chrysanthemum root, soil remediation materials greatly increase the saturated adsorption capacity of cadmium ions. The soil remediation material prepared by the invention increases the adsorption capacity of cadmium ions to 116.1 mg / g, can be used for the remediation of farmlands where heavy metals exceed the standard, and has broad market prospects.

Description

technical field [0001] The invention belongs to the technical field of soil restoration materials, and in particular relates to a method for preparing a moss root coal ash composite material for restoration of farmland soil with excessive cadmium ions. Background technique [0002] The pollutants produced by human activities enter the soil and accumulate to a certain extent, causing soil quality to deteriorate, and then causing some indicators in crops to exceed the national standard, which is called soil pollution. There are various ways for pollutants to enter the soil. Pollutants contained in exhaust gas, especially particulate matter, settle to the ground and enter the soil under the action of gravity. Wastewater carries a large amount of pollutants into the soil. Pollutants in solid waste directly enter the soil or Its exudate enters the soil. Chief among these is soil pollution from sewage irrigation. Extensive use of pesticides and chemical fertilizers has resulted ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B01J20/22B01J20/34C09K101/00
Inventor 蓝碧健
Owner TAICANG BIQI NEW MATERIAL RES & DEV