A kind of phosphorus-rich biocoke and its preparation method and application

A biocoke and phosphorus-enriched technology, which is applied in the field of contaminated soil remediation, can solve the problems that the surface chemical characteristics are not outstanding and hinder the promotion of soil remediation agents, etc., and achieve the increase of biocoke's ability to adsorb and fix heavy metals, huge social and economic benefits, and promote The effect of pore development

Active Publication Date: 2022-05-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore structure and surface chemical properties of biochar prepared by simple pyrolysis are not outstanding in terms of adsorption and immobilization of heavy metals, which hinders its promotion as a soil remediation agent.

Method used

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Effect test

preparation example Construction

[0018] A method for preparing phosphorus-enriched biocoke provided by the present invention can be prepared in the following two ways. One is to use biomass particles as raw materials, firstly perform phosphorus-enriching treatment to obtain phosphorus-enriched biomass particles, and then treat phosphorus-enriched biomass The material particles are carbonized to obtain the required phosphorus-rich biocoke; the other is to first carbonize the biomass particles to obtain biocoke, and then perform phosphorus-rich treatment on the biocoke to obtain phosphorus-rich biocoke. The above-mentioned phosphorus-rich treatment The treatment sequence of carbonization and carbonization does not affect the final treatment product of phosphorus-rich biocoke, so it can be operated according to actual needs.

[0019] Among them, when the phosphorus-enriching treatment is carried out on the biomass particles, the biomass particles and the phosphorus-containing compound solution are impregnated for...

Embodiment 1

[0028] Biomass particles with a particle size of 1 mm were prepared from one of agricultural waste, forestry waste, algae, sludge, and domestic waste, and the biomass particles were mixed with H3PO4 solution (phosphate ion concentration was 1mol / L ) mixed in a ratio of 1:1 and soaked for 6 hours, then dehydrated and dried to obtain phosphorus-rich biomass particles, and then the pyrolysis of phosphorus-rich biomass particles in a mixed atmosphere of nitrogen and carbon dioxide (the volume concentration of carbon dioxide is 10%) For carbonization in the furnace, first raise the temperature to 1000°C at a heating rate of 20°C / min, then keep it at 1000°C for 0.5 hours, and finally cool to room temperature under air-cooling conditions to obtain the required phosphorus-rich biocoke.

Embodiment 2

[0030] Biomass particles with a particle size of 10mm are prepared from a mixture of agricultural waste, algae, and sludge, and the biomass particles are mixed with a phosphorus-containing compound solution (specifically, a mixed solution of K3PO4 solution and (NH4)3PO4 solution, the mixing ratio There is no limitation, as long as the concentration of phosphate ion is guaranteed to be 10mol / L) mixed at a ratio of 1:10, soaked for 2 hours, then dehydrated and dried to obtain phosphorus-rich biomass particles, and then the phosphorus-rich biomass particles were placed in nitrogen and For carbonization in a pyrolysis furnace in a carbon dioxide mixed atmosphere (volume concentration of carbon dioxide is 50%), first raise the temperature to 500°C at a heating rate of 5°C / min, then keep it at 500°C for 2 hours, and finally cool it under water cooling conditions to room temperature to obtain the desired phosphorus-rich biochar.

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Abstract

The invention belongs to the field of contaminated soil remediation, and specifically discloses a phosphorus-enriched biocoke and its preparation method and application. It uses biomass particles as raw materials, and performs phosphorus-enrichment and carbonization treatment to obtain phosphorus-enriched biocoke, wherein the phosphorus-enrichment treatment is The biomass particles / bio-coke and the phosphorus-containing compound solution are impregnated according to the set mass ratio for a predetermined time, and then dehydrated and dried to obtain phosphorus-rich biomass particles / phosphorus-rich bio-coke; the carbonization treatment is to combine the biomass particles / phosphorus-rich The material particles are heated to the preset temperature according to the set heating rate in the pyrolysis furnace whose mixed atmosphere is nitrogen and carbon dioxide, then kept for a predetermined time and then cooled to room temperature to obtain biocoke / phosphorus-rich biocoke. The phosphorus-rich biocoke prepared by the invention can be used as a soil improver and repair agent, has a good repair effect on heavy metal polluted soil, and has the advantages of simplicity, high efficiency and durability.

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, and more specifically relates to a phosphorus-rich biocoke and its preparation method and application. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" released in 2014, the overall situation of China's soil environment is not optimistic. The national soil pollution rate is 16.1%, of which 20 million hectares are polluted by heavy metals, and more than 700,000 hectares are seriously polluted. 130,000 hectares of land were abandoned due to excessive cadmium content. Facing the serious situation of soil pollution, on May 28, 2016, the State Council issued the Action Plan for Prevention and Control of Soil Pollution, clearly stating that it will comprehensively strengthen supervision and law enforcement, clarify the focus of supervision, and focus on monitoring cadmium, mercury, arsenic, lead, Heavy metals such as chromium and organic pollutants s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/00C05G3/80
CPCC09K17/40C05B7/00C05B17/00B09C1/00C05G3/80C05D9/00
Inventor 陈汉平张雄张涵陈应泉李佳硕邵敬爱杨海平王贤华张世红
Owner HUAZHONG UNIV OF SCI & TECH
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