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Preparation method of ion mineralization blocking agent for heavy metal contaminated soil remediation

A technology for polluting soil and heavy metals, applied in the field of soil pollution control, can solve the problems of soil fertility damage, large amount of chemical use, long repair cycle, etc., and achieve the effect of fast effect, low cost and small amount of use

Inactive Publication Date: 2014-02-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used passivation materials mainly include phosphate, carbonate, silicate and clay, etc., but the existing such technologies, such as application numbers are 201110125022, 201210458846.0, 201110246042.X, 201210267704.6, 201110125022.7 and other Chinese invention patents , most of the above components are simply mixed and used, and there are disadvantages such as large amount of chemicals used, long repair period, poor long-term effect, high price, and easy damage to soil fertility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 30% phosphoric acid prepared with 25% ethanol solution into the beaker, adjust the pH value to 10 with NaOH, then slowly add calcium chloride solution (Ca:P molar ratio = 1:0.6), at 25 The precipitation reaction is carried out at ℃ for 2 hours, and the precipitate obtained is filtered, and the filtered solid is dried at 50 ℃, and ground into a material (A) of not less than 150 mesh.

[0023] (2) Using rice straw as raw material, crush it into a material (B) with a particle size of less than 1.0 mm.

[0024] (3) In terms of weight ratio, mix 10% of material A and 60% of material B with 25% of bentonite evenly, heat up to 450°C and roast for 2 hours under air-isolated conditions, and after cooling to room temperature, add 5% of vulcanized The ferrous compound is uniformly mixed and then ground to a mesh size of not less than 200 to obtain an ion mineralization and sealing agent.

[0025] The Cd-contaminated soil was selected as the sample for this implementation,...

Embodiment 2

[0027] (1) Add 40% phosphoric acid prepared with 50% ethanol solution into the beaker, adjust the pH value to 11 with NaOH, then slowly add calcium chloride solution (Ca:P molar ratio = 1:0.5), at 30 The precipitation reaction was carried out at ℃ for 1 hour, and the precipitate obtained was filtered, and the filtered solid was dried at 45℃, and ground into a material (A) of not less than 150 mesh.

[0028] (2) Use peanut shells as raw materials and crush them into material (B) with a particle size of less than 1.0 mm.

[0029] (3) Mix 10% of material A and 70% of material B with 10% bentonite evenly by weight ratio, heat up to 500°C for 2 h under air-isolated conditions, and mix in 10% vulcanization after cooling to room temperature The sodium compound is uniformly mixed and then ground to a mesh size of not less than 200 to obtain an ion mineralization sequestering agent.

[0030] The Pb-contaminated soil was selected as the sample for this implementation, and the concentra...

Embodiment 3

[0032] (1) Add 30% phosphoric acid prepared with 40% ethanol solution into the beaker, adjust the pH value to 13 with NaOH, then slowly add calcium chloride solution (Ca:P molar ratio = 1:0.8), at 35 The precipitation reaction is carried out at ℃ for 1 hour, and the precipitate obtained is filtered, and the filtered solid is dried at 60 ℃, and ground into a material (A) of not less than 150 mesh.

[0033] (2) Using sawdust as raw material, crush it into a material (B) with a particle size of less than 1.0 mm.

[0034] (3) In terms of weight ratio, mix 15% of material A and 65% of material B with 15% bentonite evenly, heat up to 600°C and roast for 1 hour under air-isolated conditions, and after cooling to room temperature, add 5% of sulfite The iron compound is uniformly mixed and then ground to a mesh size of not less than 200 to obtain an ion mineralization sequestering agent.

[0035] The soil contaminated with Pb and Zn was selected as the sample for this implementation, ...

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Abstract

The invention discloses a preparation method of an ion mineralization blocking agent for heavy metal contaminated soil remediation. The preparation method is characterized in that a crystal mixed compound agent having ultrahigh cation-exchange capacity, specific surface area and adsorption property is prepared by using phosphoric acid, calcium chloride, bentonite and biomass wastes as raw materials through high-temperature baking, the crystal mixed compound agent is compounded with a sulfenyl compound so as to realize the mineralization blocking of heavy metal ions in the soil through the deep synergistic effect of multiple mechanisms such as ion exchange, adsorption, complexation, precipitation and the like, and the purpose of the in-site remediation of heavy metal contaminated soil is achieved. The compound agent prepared by the method is high in active ingredients, wide in application range, small in using amount and low in cost, takes effect quickly and can be used for the efficient in-site remediation of farmlands and other industrial heavy metal contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a preparation method of an ion mineralization sealing agent used for remediation of heavy metal polluted soil. Background technique [0002] Soil heavy metal pollution refers to the phenomenon that the heavy metal content in the soil is significantly higher than the original content due to the introduction of heavy metals into the soil due to human activities, and the deterioration of the ecological environment is caused. The pollution is mainly caused by mining, smelting, electroplating, chemical industry, electronics and It is caused by the "three wastes" of industrial production such as tanning dyes, as well as the unreasonable application of sewage irrigation, pesticides, and chemical fertilizers. With the rapid growth of the global population, the continuous expansion of industrial production scale and the rapid development of urbanization, soil, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 王学江颜湘波黄嘉瑜王鑫卜云洁陈杰张晶安雨梦赵建夫
Owner TONGJI UNIV
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