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Composite biochar and preparation method thereof, and ecological restoration method of industrial solid waste

A technology of biochar and solid water, applied in fertilizer mixtures, chemical instruments and methods, agriculture, etc., can solve problems such as pH reduction and difficulty in stabilization

Active Publication Date: 2021-07-06
ZHENGZHOU UNIV
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  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a composite biochar and its preparation method, and an ecological restoration method for industrial solid waste, so as to solve the problems in the prior art that the acid slag yard still releases acidic substances after being neutralized by alkali. Leading to its acidification, conventional reagents neutralize the technical problem that the pH gradually decreases and is difficult to stabilize

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  • Composite biochar and preparation method thereof, and ecological restoration method of industrial solid waste
  • Composite biochar and preparation method thereof, and ecological restoration method of industrial solid waste
  • Composite biochar and preparation method thereof, and ecological restoration method of industrial solid waste

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preparation example Construction

[0047] On the other hand, the present invention also provides a preparation method of composite biochar, such as figure 2 shown, including the following steps:

[0048] Step 1, crushing the waste biomass;

[0049] Step 2, subjecting the broken waste biomass to hydrothermal carbonization, separating the hydrothermal carbonization product from solid and liquid to obtain solid hydrothermal charcoal, and dehydrating the solid hydrothermal charcoal to obtain dehydrated hydrothermal charcoal;

[0050] Step 3, mix part of the dehydrated hydrothermal charcoal and red mud evenly, then add it to the granulator, spray the binder to granulate and form, and obtain hydrothermal charcoal and red mud shaped granules;

[0051] Step 4. Continue to add evenly mixed dehydrated hydrothermal charcoal and alkali to the granulator, spray the binder for granulation and molding, and obtain hydrothermal charcoal and red mud shaped particles as the core, and the outer surface is wrapped with hydrotherm...

Embodiment 1

[0074] The present embodiment provides a kind of preparation method of composite biochar, comprising the following steps:

[0075] Step 1, crushing the lignocellulosic biomass; the mass content of lignin, cellulose, and hemicellulose in the lignocellulosic biomass is 54%; the particle size of the waste biomass after crushing is 0.18mm; the lignocellulose Examples of biomass include straw, wood chips, fallen leaves, bagasse and coconut shells.

[0076] Step 2. Carry out hydrothermal carbonization of the waste biomass after crushing, and add citric acid with a mass concentration of 2% during hydrothermal carbonization; during the hydrothermal carbonization process, the mass ratio of waste biomass to water is 1:1; The carbonization temperature is 155°C, and the hydrothermal carbonization time is 32 minutes; the hydrothermal carbonization product is subjected to solid-liquid separation to obtain solid hydrothermal charcoal, and the solid hydrothermal charcoal is dehydrated. The wa...

Embodiment 2

[0081] The present embodiment provides a kind of preparation method of composite biochar, comprising the following steps:

[0082] Step 1, crushing the lignocellulosic biomass; the mass content of lignin, cellulose, and hemicellulose in the lignocellulosic biomass is 70%; the particle size of the waste biomass after crushing is 0.15 mm; the lignocellulose Examples of biomass include straw, wood chips, fallen leaves, bagasse and coconut shells.

[0083] Step 2. Carrying out hydrothermal carbonization of the crushed waste biomass, adding oxalic acid with a mass concentration of 5% during hydrothermal carbonization; during the hydrothermal carbonization process, the mass ratio of waste biomass to water is 1:3; hydrothermal carbonization The temperature is 200°C, and the hydrothermal carbonization time is 170 minutes; the hydrothermal carbonization product is subjected to solid-liquid separation to obtain solid hydrothermal charcoal, and the solid hydrothermal charcoal is dehydrat...

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Abstract

The invention relates to composite biochar and a preparation method thereof, and an ecological restoration method of industrial solid waste, belongs to the technical field of industrial solid waste treatment, and solves the technical problems that in the prior art, after alkali neutralization is adopted in an acid slag storage yard, acidic substances are still released to cause acidification of the acid slag storage yard, and the pH is gradually reduced and is difficult to stabilize in conventional reagent-based neutralization. The core structure of the composite biochar is hydrothermal carbon and red mud molding particles, and the shell structure of the composite biochar is hydrothermal carbon and alkali molding particles. The preparation method of the composite biochar comprises the following steps of: 1, crushing waste biomass; 2, preparing dehydrated hydrothermal carbon; 3, preparing hydrothermal carbon and red mud molding particles; 4, preparing composite molding particles which take the hydrothermal carbon and red mud molding particles as an inner core wrapped with hydrothermal carbon and alkali molding particles; and 5, carbonizing the composite molding particles in inert gas to obtain the composite biochar. The composite biochar with the core-shell structure prepared by the invention has a good alkaline slow-release effect.

Description

technical field [0001] The invention relates to the technical field of industrial solid waste disposal, in particular to a composite biochar, a preparation method thereof, and an ecological restoration method of industrial solid waste. Background technique [0002] The industrial production process produces a large amount of industrial waste, and a large amount of solid waste is mainly disposed of through stockpiling, which has caused serious environmental hazards. Acid waste residue is a kind of industrial solid waste, which has strong acidity and has a huge pollution risk to groundwater and soil. Sulfuric acid slag is a kind of acidic waste generated during the production of sulfuric acid from pyrite. The emission in my country is about 12 million tons. The utilization rate of resources is low, and it is still disposed of by stockpiling. [0003] In order to reduce the environmental pollution of acid slag dumps, it is necessary to solve the problem of strong acidity in ac...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K109/00
CPCC09K17/40C09K2109/00
Inventor 王重庆曹亦俊
Owner ZHENGZHOU UNIV
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