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Preparation method of carbon-based difunctional soil remediation agent, product and remediation method

A soil remediation agent and dual-function technology, which is applied in the field of preparation of carbon-based dual-function soil remediation agent, can solve the problems of inability to meet the supplementary nutrient requirements of barren soil and low repair efficiency, and achieve suitable scale promotion, improve fixation capacity, and repair The effect of cycle improvement

Pending Publication Date: 2022-04-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a preparation method, product and repair method of a carbon-based dual-function soil repair agent, which solves the problem that the repair efficiency is not high and cannot meet the supplementary nutrient requirements of barren soil

Method used

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  • Preparation method of carbon-based difunctional soil remediation agent, product and remediation method
  • Preparation method of carbon-based difunctional soil remediation agent, product and remediation method
  • Preparation method of carbon-based difunctional soil remediation agent, product and remediation method

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preparation example Construction

[0031] Such as figure 1 Shown, a kind of preparation method of carbon-based dual-function soil remediation agent, it comprises the steps:

[0032] (1) drying the biomass raw material, pulverizing, and sieving to obtain biomass particles;

[0033] (2) Mix biomass particles, phosphate fertilizer, and water, stir evenly at a set temperature, and evaporate the above mixture to obtain a biochar precursor;

[0034] (3) Slowly heat the precursor to a set temperature under anaerobic or hypoxic conditions and keep it for a period of time for pyrolysis to obtain a biochar matrix;

[0035] (4) Sodium carboxymethyl cellulose is mixed with water, stirred at a set temperature, until sodium carboxymethyl cellulose is completely dissolved, and sodium carboxymethyl cellulose gel is obtained;

[0036] (5) Mixing the biochar matrix and the gel solution in a certain ratio, stirring evenly, and freeze-drying to obtain a carbon-based dual-function soil remediation agent.

[0037] Further, step (...

Embodiment 1

[0049] 1. Preparation of carbon-based bifunctional soil remediation agent

[0050] (1) 3kg moso bamboo slices are washed with water and then dried, then pulverized with a pulverizer through an 80-mesh sieve, and the bamboo particles with a particle diameter of less than 0.180mm are dried again, and put into a storage tank for subsequent use;

[0051] (2) adopt the method of solvothermal treatment, according to moso bamboo granules: potassium dihydrogen phosphate fertilizer (KH 2 PO 4 , where P 2 o 5 The content is about 52wt.%, K 2 O content is about 34wt.%) The ratio of mass ratio is 5:1 Take 0.6kg phosphate fertilizer and moso bamboo granule mix, add 14.4kg water (solid-to-liquid ratio is 1:4) and move into the stirrer that has been heated to 80 ℃ and stir 2h, the mixture is dried to obtain a biochar precursor;

[0052] (3) Place the precursor in step (2) in a fixed-bed reaction device to raise the temperature from room temperature to the optimal working condition of 55...

Embodiment 2

[0062] 1. Preparation of carbon-based bifunctional soil remediation agent

[0063] (1) Wash 0.5 kg of corn stalks with water and dry them, then use a pulverizer to crush them through a 120-mesh sieve, dry the corn stalks with a particle size less than 0.125 mm, and put them into a storage tank for subsequent use;

[0064] (2) Solvent heat treatment is adopted, according to the corn stalk particles: superphosphate fertilizer (Ca(H 2 PO 4 ) 2 , where P 2 o 5 The content is between 14wt.%~20wt.%), the mass ratio is 1:5, mix 2.5kg of phosphate fertilizer with corn stalk granules, add 24kg of water (solid-to-liquid ratio is 1:8) and move it into the 90°C heated Stirring in a stirrer for 8h, drying the mixture to obtain a biochar precursor;

[0065] (3) Put the precursor in step (2) in a fixed-bed reaction device and raise the temperature from room temperature to the optimal working condition of 750 °C at a rate of 10 °C / min, keep the pyrolysis temperature for 2 hours to obtain...

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Abstract

The invention belongs to the related technical field of soil remediation and controlled-release fertilizers, and discloses a preparation method of a carbon-based difunctional soil remediation agent, a product and a remediation method. The preparation method comprises the following steps: S1, mixing biomass particles, an inorganic phosphate fertilizer and water, uniformly stirring and mixing, and evaporating the mixed mixture to dryness to obtain a biochar precursor; s2, pyrolyzing the biochar precursor to form pores in the biochar precursor so as to obtain a biochar matrix, and in the pyrolysis process, storing a P functional group in the phosphate fertilizer and an element K or Ca required by plant growth in the biomass into the pores; s3, sodium carboxymethyl cellulose is selected and dissolved to obtain a corresponding gel solution, the gel solution and the biochar matrix are mixed, stirred to be uniform and freeze-dried, and the needed carbon-based difunctional soil remediation agent is obtained. By means of the method, the problems that the repairing efficiency is not high, and the nutrient supplementing requirement of barren soil cannot be met are solved.

Description

technical field [0001] The invention belongs to the related technical field of soil restoration and controlled-release fertilizer, and more specifically relates to a preparation method, product and restoration method of a carbon-based dual-function soil restoration agent. Background technique [0002] In recent years, carbon-based adsorbent materials such as activated carbon have been considered as one of the most promising and efficient adsorbents for soil pollutant removal due to their high stability, large specific surface area and pore volume, good pore distribution, etc. . In addition, after biochar is returned to the field, it can become an inert carbon pool of the soil, which has the advantage of "carbon negative emission". To improve the efficiency of biochar in removing pollutants, a series of carbon-based soil remediation agents have been used for soil remediation. However, existing carbon-based soil remediation agents have more or less defects due to differenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/40C09K101/00
Inventor 张世红张涵王贤华向家涛廖玮邵敬爱杨海平张雄陈汉平陈应泉
Owner HUAZHONG UNIV OF SCI & TECH
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