Modified desulfurized fly ash for fixing carbon dioxide and preparation method thereof

A carbon dioxide and desulfurization ash technology, applied in the direction of organic chemical methods, chemical instruments and methods, separation methods, etc., can solve the problems of poor carbon fixation ability and low calcium element content, and achieve improved capacity, convenient operation, and simple and easy preparation method line effect

Active Publication Date: 2020-12-18
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a product of dry desulfurization of coal-fired flue gas, desulfurization ash is a cheap and easy-to-obtain carbon fixation material, but its calcium content for carbon fixation is low and its carbon fixation capacity is poor

Method used

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  • Modified desulfurized fly ash for fixing carbon dioxide and preparation method thereof
  • Modified desulfurized fly ash for fixing carbon dioxide and preparation method thereof
  • Modified desulfurized fly ash for fixing carbon dioxide and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A method for preparing a modified desulfurization ash for fixing carbon dioxide, comprising the following steps:

[0030] (1) Take 50 grams of desulfurization ashes, wash them twice with ethanol and deionized water, dry them in a drying oven at 105°C until they pass through a 100-mesh sieve with a constant weight, and heat them at 800°C for 2 hours in a muffle furnace to obtain activated desulfurization Ash;

[0031] (2) Take 50 grams of γ-aminopropyltriethoxysilane and dissolve it in 25 grams of absolute ethanol, then add 50 grams of deionized water, and treat it for 30 hours at 40°C, with an ultrasonic power of 400W and a frequency of 40kHz. Minutes, get nitrogen-containing silane coupling agent hydrolyzate;

[0032] (3) The activated desulfurization ash obtained in step (1) was mixed with the nitrogen-containing silane coupling agent hydrolyzate obtained in step (2), mechanically stirred at a speed of 250 rpm for 4 hours, and the product was tiled on a glass plate, ...

Embodiment 2

[0046] A method for preparing a modified desulfurization ash for fixing carbon dioxide, comprising the following steps:

[0047](1) Take 40 grams of desulfurization ashes, wash them twice with ethanol and deionized water, dry them in a drying oven at 100°C until they pass through a 200-mesh sieve with a constant weight, and heat them at 700°C for 1.5 hours in a muffle furnace to obtain activated desulfurization Ash;

[0048] (2) Dissolve 30 grams of γ-aminopropyltrimethoxysilane in 20 grams of absolute ethanol, then add 20 grams of deionized water, and stir mechanically at 40°C for 1 hour to obtain a nitrogen-containing silane coupling agent for hydrolysis liquid;

[0049] (3) The activated desulfurization ash obtained in step (1) was mixed with the nitrogen-containing silane coupling agent hydrolyzate obtained in step (2), mechanically stirred at a speed of 300 rpm for 4 hours, and the product was tiled on a glass plate, Dry naturally in the air until the solvent evaporates...

Embodiment 3

[0055] A method for preparing a modified desulfurization ash for fixing carbon dioxide, comprising the following steps:

[0056] (1) Take 40 grams of desulfurization ashes, wash them twice with ethanol and deionized water, dry them in a drying oven at 105°C until they pass through a 300-mesh sieve with a constant weight, and heat them at 750°C for 2 hours in a muffle furnace to obtain activated desulfurization Ash;

[0057] (2) Dissolve 60 grams of γ-aminopropylmethyldiethoxysilane in 50 grams of absolute ethanol, then add 80 grams of deionized water, and stir mechanically at 40°C for 2 hours to obtain nitrogen-containing silane diacetate Joint agent hydrolyzate;

[0058] (3) The activated desulfurization ash obtained in step (1) was mixed with the nitrogen-containing silane coupling agent hydrolyzate obtained in step (2), mechanically stirred at a speed of 350 rpm for 4 hours, and the product was tiled on a glass plate, Dry naturally in the air until the solvent evaporates ...

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Abstract

The invention discloses modified desulfurized fly ash for fixing carbon dioxide and a preparation method of the modified desulfurized fly ash, the modified desulfurized fly ash comprises desulfurizedfly ash, a nitrogen-containing silane coupling agent, ethanol and deionized water, and the mass ratio of the desulfurized fly ash to the nitrogen-containing silane coupling agent to the ethanol to thedeionized water is 1:(0.3-2):(0.3-2):(0.5-3). According to the modified desulfurized fly ash provided by the invention, a traditional method for fixing carbon dioxide by simply utilizing a calcium-based material is changed, amino functional groups are introduced to the surface of the desulfurized fly ash through modification of a nitrogen-containing silane coupling agent, the chemical adsorptioneffect of the carbon dioxide is improved, and the capability of fixing the carbon dioxide by the desulfurized fly ash can be greatly improved. The preparation method of the modified desulfurized fly ash is simple and easy to implement and convenient to operate. The modified desulfurized fly ash can be used as a filling component of a mined waste mine to realize fixation and permanent storage of carbon dioxide. The method can realize resource utilization of the dry desulfurization ash, and is low-carbon and environment-friendly.

Description

technical field [0001] The invention relates to a modified desulfurization ash for fixing carbon dioxide and a preparation method thereof, belonging to the field of environmental materials. Background technique [0002] The greenhouse effect is often attributed to a substantial increase in the concentration of carbon dioxide in the atmosphere. Since carbon dioxide mineral storage technology can permanently fix carbon dioxide, it can effectively reduce the concentration of carbon dioxide in the atmosphere. Although improving energy efficiency, saving energy and reducing emissions, adjusting energy structure, and vigorously developing clean and renewable energy are necessary guarantees for reducing carbon dioxide emissions, the most effective and reliable option to reduce the amount of carbon dioxide in the atmosphere is to increase carbon dioxide capture , storage and resource utilization. [0003] At present, the commonly used materials for mineral sequestration of carbon d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/62B01D53/81C07F7/08
CPCB01D53/62B01D53/81C07B2200/11C07F7/0834Y02P20/151
Inventor 杨虹冯启言刘营梁浩乾陶欢陈迪
Owner CHINA UNIV OF MINING & TECH
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