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Method for preparing soil conditioner by in-situ hydrothermal combination of ceramsite and biochar

A soil conditioner and in-situ hydrothermal technology, applied in ceramic products, fertilizer mixtures, soil conditioning materials, etc., can solve environmental hazards, waste of land resources, surrounding air pollution, etc., to reduce pollution, enhance water retention performance, The effect of enhancing soil water retention

Pending Publication Date: 2021-10-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fly ash has strong alkalinity, and a large amount of stockpiling has caused a waste of land resources, and the harmful substances in fly ash gradually penetrate into the surface and surrounding water bodies, causing certain harm to the environment; and fly ash dust will also affect ambient air pollution

Method used

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  • Method for preparing soil conditioner by in-situ hydrothermal combination of ceramsite and biochar
  • Method for preparing soil conditioner by in-situ hydrothermal combination of ceramsite and biochar
  • Method for preparing soil conditioner by in-situ hydrothermal combination of ceramsite and biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing a soil conditioner by using ceramsite in-situ hydrothermal combination with biochar, comprising the following steps:

[0030] (1) Preparation of ceramsite

[0031] Mixing: Take 8.5g of fly ash, 1.5g of red mud, and a certain amount of biomass to pass through a 100-mesh sieve, mix the fly ash and red mud to form a fly ash-red mud mixture, add 1.5g to pass through a 100-mesh sieve Sieve phosphogypsum powder, and then mix biomass with fly ash-red mud to form ceramsite to prepare raw materials.

[0032] Ball making: add appropriate amount of water to the raw materials for ceramsite preparation, so that the raw materials for ceramsite preparation can be bonded and there is still a certain amount of moisture on the surface, and then manually make balls, and the raw materials for ceramsite preparation are made into a spherical green body with a diameter of 10mm, and the granulation is completed Then place it in a tray to air dry for 1 hour.

[0033] Th...

Embodiment 2

[0040] A method for preparing a soil conditioner by using ceramsite in-situ hydrothermal combination with biochar, comprising the following steps:

[0041] (1) Preparation of ceramsite:

[0042] Mixing: Take 8.0g fly ash, 3.0g red mud, 2.0g phosphogypsum, and pass a certain amount of biomass through a 100-mesh sieve, mix fly ash and red mud to form a fly ash-red mud mixture, add 1.5g phosphogypsum powder, and then mix biomass with fly ash-red mud to form ceramsite preparation raw material.

[0043] Ball making: Add appropriate amount of water to the raw materials for ceramsite preparation, so that the raw materials for ceramsite preparation can be bonded and there is still a certain amount of moisture on the surface. Manually make balls, and make the raw materials for ceramsite preparation into a spherical green body with a diameter of 5mm, and the granulation is completed. Then place it in a tray to air dry for 1 hour.

[0044] The ceramsite is roasted by a stepwise heating...

Embodiment 3

[0051] A method for preparing a soil conditioner by using ceramsite in-situ hydrothermal combination with biochar, comprising the following steps:

[0052] (1) Preparation of ceramsite:

[0053] Mixing: take 6.0g fly ash, 4.0g red mud, 3.0g phosphogypsum, and 3.0g biomass through a 100-mesh sieve, mix fly ash and red mud to form a fly ash-red mud mixture, add 1.5 g phosphogypsum powder, and then mix biomass with fly ash-red mud to form ceramsite as raw material.

[0054] Ball making: Add appropriate amount of water to the raw materials for ceramsite preparation, so that the raw materials for ceramsite preparation can be bonded and there is still a certain amount of moisture on the surface, and manually make balls, and the raw materials for ceramsite preparation are made into a spherical green body with a diameter of 8mm, and the granulation is completed Then place it in a tray to air dry for 1 hour.

[0055] The ceramsite is roasted by a stepwise heating method: drying stage...

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Abstract

The invention discloses a method for preparing a soil conditioner by in-situ hydrothermal combination of ceramsite and biochar. The method comprises the following steps: crushing industrial waste, then conducting mixing and granulating, carrying out roasting through stepped heating, and carrying out cooling to room temperature to obtain ceramsite. According to the invention, biomass waste and ceramsite are combined through a hydrothermal carbonization method, and solid waste is adopted as a preparation raw materials, so production cost is reduced while the solid waste is fully utilized. As biomass and ceramsite are combined, preparation of combined biochar and ceramsite is achieved, a porous structure enables ceramsite to have higher water absorption and adsorption performance, the water retention property of soil is enhanced, and harmful substances can be adsorbed at the same time; and moreover, the functional groups of biomass waste raw materials can also effectively adsorb pollutants. In addition, heavy metal ions in ceramsite are fixed after being fired, so secondary pollution to the environment is avoided; and therefore, the ceramsite can become a good soil conditioner.

Description

technical field [0001] The invention relates to a method for preparing a soil conditioner by using ceramsite in-situ hydrothermal combination with biochar, and belongs to the technical field of new materials. Background technique [0002] The rapid economic development has led to an increase in the discharge of industrial solid waste. Among them, red mud is a very fine solid waste produced during the process of refining alumina from bauxite, which is a highly alkaline waste residue. For every ton of alumina produced, 0.8-1.5 tons of red mud will be produced. The discharge of red mud is large, and the utilization rate of red mud in my country is extremely low, only 4%. Red mud contains a variety of harmful substances. In the process of long-term stacking, in addition to wasting land resources, it will also cause a large amount of lye and harmful substances to seep into the nearby land, causing harm to the environment such as land alkalization, surface water and groundwater po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K17/08C09K17/04C04B38/00C04B38/06C04B33/135C04B33/132C04B33/13C05G3/40C05G3/80
CPCC09K17/40C09K17/08C09K17/04C04B38/009C04B38/0645C04B33/1352C04B33/1322C04B33/132C04B33/13C05G3/40C05G3/80C09K2101/00C04B2235/6562C04B2235/6567C04B2235/661Y02P40/60
Inventor 熊丹苓董祥孙亮张兰岑启宏赵焱
Owner KUNMING UNIV OF SCI & TECH
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