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Preparation method and application of lead-polluted soil restoration material

A technology for lead-contaminated soil and remediation materials is applied in the field of preparation and application of lead-contaminated soil remediation materials, which can solve the problems of lower soil organic matter content, lower effective lead content, lower bioavailability, etc. High remediation efficiency and the effect of improving soil fertility

Active Publication Date: 2015-12-09
师大清远环境修复科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Qian Yi et al. (Qian Yi, Chu Xingfei. Effect evaluation of nano-hydroxyapatite remediation of cadmium and lead-contaminated soil. Environmental Science and Technology, 2011, 34 (11): 176-179) used Tessier five-step continuous extraction method to study the effect of nHAP on The remediation effect of cadmium and lead-contaminated soil shows that 5% nHAP can reduce the available lead content in soil by 90%; MaoHe et al. , when the dosage of nHAP was 5:1 P / (Pb+Cd), the water-soluble lead in soil decreased by 72%, and the bioavailability decreased by 65.3%
Nano-hydroxyapatite has a significant effect in the remediation of soil lead pollution, but it may bring certain environmental risks to the soil, such as reducing the content of soil organic matter and imbalance of nutrients, etc.

Method used

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  • Preparation method and application of lead-polluted soil restoration material
  • Preparation method and application of lead-polluted soil restoration material
  • Preparation method and application of lead-polluted soil restoration material

Examples

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preparation example Construction

[0037] A preparation method of a lead-contaminated soil remediation material, the steps of which are:

[0038] 1) Impregnation: Disperse nano-hydroxyapatite in water, ultrasonicate, add potassium chloride, and then add agricultural waste, stir evenly, separate, and dry;

[0039] 2) Pyrolysis: pyrolyze the dried material in a protective atmosphere to obtain a black solid, which can be ground.

[0040] Preferably, the agricultural waste is bagasse.

[0041] Preferably, the mass ratio of nano-hydroxyapatite, bagasse and potassium chloride is 1:(5-20):(0.01-0.04).

[0042] Preferably, sonicate for 30min-1h.

[0043] Preferably, step 2) is specifically: put the dried material into a crucible, place it in a muffle furnace with a protective atmosphere, raise the temperature to 500-700°C at 15-25°C / min, and continue heating at this temperature Solution for 1~3h, cool down the muffle furnace to room temperature, take out the black solid, and grind it.

[0044] Preferably, the prote...

Embodiment 1

[0056] A method for preparing biochar, comprising the steps of:

[0057] (1) Drying: Shred the collected bagasse and dry it at 105°C.

[0058] (2) Pyrolysis: Put the weighed bagasse into a crucible and place it in a muffle furnace. Under nitrogen, set the final temperature at 500-700°C, and raise the temperature to this temperature at 15-25°C / min After the interval, continue to carbonize for 1~3h. After the muffle furnace cools down to room temperature, take it out, grind it, pass it through a 20-mesh sieve, and keep it sealed. figure 1 SEM image of biochar.

Embodiment 2

[0060] A preparation method of a lead-contaminated soil remediation material is as follows:

[0061] (1) Impregnation: Disperse a certain quality of nano-hydroxyapatite in deionized water, ultrasonicate for 30 minutes, add potassium chloride, then add bagasse, separate after stirring for 0.5-2 hours, and dry at 80°C. The mass ratio of nano-hydroxyapatite, bagasse and potassium chloride is 1:(5~20):(0.01~0.04).

[0062] (2) Pyrolysis: Put the dried material into a crucible and put it in a muffle furnace. Under nitrogen, set the final temperature to 500~700°C, and raise the temperature to this temperature range at 15~25°C / min Afterwards, carbonization was continued for 1~3h to obtain a black solid, which was ground for use.

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Abstract

The invention discloses a preparation method and application of a lead-polluted soil restoration material. The preparation method comprises the following steps: 1) dipping, concretely, dispersing nanometer hydroxylapatite in water, performing ultrasonic processing, adding potassium chloride, then adding bagasse, uniformly stirring, separating, and drying; and 2) performing pyrolysis, concretely, performing pyrolysis on the dried material in a protective atmosphere, so as to obtain a black solid, and grinding, so as to obtain the target material. A preparation method of biological carbon comprises the following steps: 1) drying, concretely, crushing agricultural wastes and drying; and 2) performing pyrolysis, concretely, performing pyrolysis on dried bagasse in a protective atmosphere, grinding and sieving. Application of the prepared lead-polluted soil restoration material to in-situ restoration of lead-polluted soil is disclosed. The in-situ restoration method for lead-polluted soil comprises pouring the prepared lead-polluted soil restoration material to soil, then adding water and uniformly mixing. The prepared restoration material is applicable to in-situ restoration of lead-polluted soil and is high in restoration efficiency.

Description

technical field [0001] The invention relates to a preparation method and application of a lead-contaminated soil restoration material. Background technique [0002] Lead is an element widely distributed in nature, and is widely used in industrial fields such as batteries, gasoline anti-explosion agents, building materials, and composite materials (such as lead salt stabilizers in modified plastics). In the past 50 years, about 783,000 tons of lead have been discharged into the global environment, and most of them have entered the soil environment, resulting in varying degrees of soil lead pollution. my country's "Twelfth Five-Year Plan for the Prevention and Control of Heavy Metal Pollution" issued in 2011 clearly listed lead as one of the key points in the prevention and control of heavy metal pollution. In 24 provinces (municipalities) in my country, the suburbs, sewage irrigation areas, mining areas and other areas with rapid industrial development, agricultural products...

Claims

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Application Information

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IPC IPC(8): C09K17/06C09K17/00B09C1/08B09C1/00
Inventor 方战强杨璋梅
Owner 师大清远环境修复科技有限公司
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