Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Phosphorus-enriched biochar, and preparation method and applications thereof

A biocoke and phosphorus-enriched technology, applied in the field of contaminated soil remediation, can solve the problems that hinder the promotion of soil remediation agents and the surface chemical characteristics are not outstanding, so as to increase the ability to adsorb and fix heavy metals, remediate polluted soil without secondary pollution, and increase the capacity Effect

Active Publication Date: 2017-08-29
HUAZHONG UNIV OF SCI & TECH
View PDF3 Cites 4 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
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 sequence of treatment and carbonization treatment does not affect the final treatment product 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 a pred...

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of polluted soil repairing, and more specifically discloses a phosphorus-enriched biochar, and a preparation method and applications thereof. According to the preparation method, biomass particles are taken as raw materials, and the phosphorus-enriched biochar is obtained via phosphorus enriching and carbonization, wherein in the step of phosphorus enriching, biomass particles / biochar and a phosphorus-containing compound solution are subjected to dipping at a preset mass ratio for a preset period of time, and then are subjected to dehydration drying so as to obtain phosphorus-enriched biomass particles / phosphorus-enriched biochar; in the step of carbonization, biomass particles / phosphorus-enriched biomass particles are delivered into a thermal decomposition furnace at a mixed atmosphere of nitrogen and carbon dioxide, the temperature is increased to a preset temperature at a preset temperature increasing speed, the temperature is maintained for a preset period of time, and then is reduced to room temperature so as to obtain biochar / phosphorus-enriched biochar. The phosphorus-enriched biochar can be taken as a solid improvement agent and a repairing agent, possesses excellent repairing effect on heavy metal polluted soil, is convenient to use, is high in efficiency, and long in effect lasting.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/00C05G3/04C05G3/80
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com