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Biochar-based composition and preparation method and application thereof

A technology of biochar and composition, applied in application, fertilizer mixture, chemical instrument and method, etc., can solve the problems of unstable restoration effect and short duration, and achieve comprehensive improvement of heavy metal polluted farmland, low cost and remarkable restoration. Effect

Inactive Publication Date: 2020-05-05
INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a biochar-based composition and its preparation method and application, which are used to solve the technical defects in the prior art of remediating heavy metal pollution that the remediation effect is unstable and the duration is not long

Method used

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  • Biochar-based composition and preparation method and application thereof
  • Biochar-based composition and preparation method and application thereof
  • Biochar-based composition and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 1000g of sawdust, dry and pulverize it until the particle size is less than 25mm, put it into an atmosphere box furnace, pump it into a vacuum and feed nitrogen as a protective gas, raise the temperature to 220°C at a rate of 6°C / min, stay for 30min, and then After heating up to 550°C / min, keep it warm for 3 hours, pass through a 20-mesh sieve after grinding, soak in 1mol / L hydrochloric acid for 3 hours, wash and dry to obtain wood chip biochar, which is the first intermediate product 1.

[0032] Weigh 100 g of alkali-making waste residue, dry and pulverize it, and pass through a 60-mesh sieve to obtain the second intermediate product 1.

[0033] Mix 250g of the first intermediate product 1 with 50g of the second intermediate product 1, pass through a 100-mesh sieve after drying, and obtain the product 1.

Embodiment 2

[0035] Weigh 1000g of rice husk, dry and pulverize until the particle size is less than 10mm, put it into a vacuum tube furnace, and after vacuuming, feed nitrogen as a protective gas, raise the temperature to 250°C at 8°C / min, stay for 25min, and then heat it up at 3°C / min. Min heat up to 550°C, keep it warm for 2 hours, grind through a 100-mesh sieve, soak in 3mol / L hydrochloric acid for 1 hour, wash and dry to obtain chaff biochar, which is the first intermediate product 2.

[0036] Weigh 100g of lime, dry and pulverize it, and pass through a 60-mesh sieve to obtain the second intermediate product 2.

[0037] Mix 300g of the first intermediate product 2 with 30g of the second intermediate product 2, pass through an 80-mesh sieve after drying, and obtain the product 2.

Embodiment 3

[0039] Weigh 1000g of corn stalks, dry and pulverize them until the particle size is less than 10mm, put them into an atmosphere box furnace, vacuumize and feed nitrogen as a protective gas, raise the temperature to 260°C at 10°C / min, stay for 45min, and then heat up to 260°C at 2°C / min After heating up to 750°C, keep it warm for 1 hour, grind it through a 100-mesh sieve, soak it in 2mol / L hydrochloric acid for 2 hours, wash and dry it to prepare corn straw biochar, which is the first intermediate product 3.

[0040] Weigh 100 g of alkali-making waste residue, dry and pulverize it through a 60-mesh sieve to obtain the second intermediate product 3.

[0041] Mix 200g of the first intermediate product 3 with 60g of the second intermediate product 3, pass through an 80-mesh sieve after drying, and obtain the product 3.

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Abstract

The invention belongs to the field of soil treatment, and particularly relates to a biochar-based composition and a preparation method and application thereof. The preparation method comprises the following steps: weighing palm fibers without impurities, drying, crushing, putting into a vacuum tube furnace, vacuumizing, introducing nitrogen as a protective gas, heating to 230 DEG C at a speed of 8DEG C / min, standing for 45 minutes, heating to 650 DEG C at a speed of 2 DEG C / min, keeping the temperature for 2 hours, grinding, sieving, soaking in hydrochloric acid, washing and drying to obtaina first intermediate product; weighing the alkali-making waste residues, drying, crushing and sieving to obtain a second intermediate product; and mixing the first intermediate product with the secondintermediate product, drying, and sieving to obtain the charcoal-based composition. According to the technical scheme, the content of heavy metal in soil is effectively reduced, the pH of the soil isimproved, and the yield of crops planted in the soil is increased. The main technical defects of unstable remediation effect and short duration time for the remediation of heavy metal pollution in the prior art are overcome.

Description

[0001] The application date is June 17, 2016, and the application number is 201610446794.3. The invention is a divisional application of "A Biochar-based Composition in the Improvement of Heavy Metal Contaminated Soil". technical field [0002] The invention belongs to the field of soil treatment, and in particular relates to a biochar-based composition and its preparation method and application. Background technique [0003] With the acceleration of urbanization and industrialization in our country, the discharge of industrial "three wastes" such as electroplating, steel and printing and dyeing is increasing, and the unreasonable application of pesticides and fertilizers containing heavy metals in agricultural production has caused heavy metals to pass through various channels. into the soil. According to the "National Soil Condition Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2015, the heavy metals i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06C05G3/80B09C1/08C09K101/00C09K103/00
CPCB09C1/08C05D3/00C05D3/02C09K17/06C09K2101/00C09K2109/00
Inventor 黄玉芬魏岚黄庆黄连喜刘忠珍杨少海
Owner INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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