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Fly-ash-based carbon dioxide curing agent and preparation method thereof

A technology of carbon dioxide and fly ash, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., to achieve the effect of increasing porosity, wide sources, and high specific surface area

Inactive Publication Date: 2015-07-01
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are deficiencies in the cost control and simplicity of the experimental scheme, and it is necessary to improve the compound formula of the fly ash-based curing agent and the selection of experimental conditions, and the release of toxic and harmful elements in the curing agent during the curing of carbon dioxide needs further research.

Method used

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  • Fly-ash-based carbon dioxide curing agent and preparation method thereof
  • Fly-ash-based carbon dioxide curing agent and preparation method thereof
  • Fly-ash-based carbon dioxide curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 300g of fly ash and slaked lime and 200g of alumina in a 1L beaker in a ratio of 1:1, add appropriate amount of water, and stir with a glass rod to make it fully mixed. Then use a magnetic stirrer to fully stir for 3h. Take it out and dry it at 105°C. As for the firing in the muffle furnace at 300°C for 1 hour. Take it out and cool it, store it in a sealed bag, and affix the label to obtain the fly ash-based carbon dioxide curing agent. The changes in the chemical composition of the fly ash-based carbon dioxide curing agent before and after the carbon capture reaction are shown in Table 1. The image changes before and after the carbon capture reaction, the thermogravimetric-differential thermal changes before and after the carbon capture reaction, and the microscopic morphology changes before and after the carbon capture reaction. see figure 1 , diagram 2-1 , 2-2 with Figure 3-1 , 3-2 .

[0045] Table 1 Changes in chemical composition of the fly ash-based carbon...

Embodiment 2

[0055] Weigh 400g and 200g of fly ash and slaked lime and 200g of alumina in a 1L beaker in a ratio of 2:1, add appropriate amount of water, and stir with a glass rod to make it fully mixed. Then use a magnetic stirrer to fully stir for 3h. Take it out and dry it at 105°C. As for the firing in the muffle furnace at 300°C for 1 hour. Take it out and cool it, store it in a sealed bag, and affix the label to obtain the fly ash-based carbon dioxide curing agent.

Embodiment 3

[0057] Weigh 450g and 150g of fly ash and slaked lime and 200g of alumina in a 1L beaker in a ratio of 3:1, add appropriate amount of water, and stir with a glass rod to make it fully mixed. Then use a magnetic stirrer to fully stir for 3h. Take it out and dry it at 105°C. As for the firing in the muffle furnace at 300°C for 1 hour. Take it out and cool it, store it in a sealed bag, and affix the label to obtain the fly ash-based carbon dioxide curing agent.

[0058] Fly ash is a bulk waste of coal mines with a wide range of sources and low cost. It has a high specific surface area, and the fly ash contains alkali metal oxides such as CaO, and it has the ability to adsorb and fix CO by carbonation. 2 It can be used as a large amount of material in the preparation of curing agent. At the same time, slaked lime is used to improve the content of alkaline earth metals in fly ash, and the addition of alumina can effectively increase the porosity of the material. The high porosity wi...

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Abstract

The invention discloses a fly-ash-based carbon dioxide curing agent and a preparation method thereof. The fly-ash-based carbon dioxide curing agent comprises fly ash, slaked lime and aluminum oxide, wherein the weight ratio of fly ash to slaked lime to aluminum oxide is (3-4.5):(1.5-3):2. When the ratio of fly ash to slaked lime is 1:1, the carbon fixation amount is highest, and due to doping of the slaked lime, the leaching toxicity of fly ash after carbonation is reduced, and the fly-ash-based carbon dioxide curing agent is mainly used for leaching of heavy metals;fly ash is a coal burning product, is one of main bulk wastes in China at present, greenhouse-gas carbon dioxide is sealed up for storage by adopting bulk-solid-waste fly ash and the purpose of using wastes to treat wastes is achieved.

Description

Technical field [0001] The invention relates to the technical field of carbon dioxide curing agents, in particular to a fly ash-based carbon dioxide curing agent and a preparation method thereof. Background technique [0002] Since the Industrial Revolution, the amount of heat-absorbing greenhouse gases such as carbon dioxide emitted by humans into the atmosphere has increased year by year, and the greenhouse effect of the atmosphere has also increased, which has caused a series of serious problems such as global warming and rising sea levels, which threaten Is the survival and development of mankind. [0003] The main greenhouse gases that cause the greenhouse effect are CO 2 , CH 4 , N 2 O, O 3 , Chlorofluorocarbons and moisture, etc., among which CO 2 The contribution rate reached 70%, which is the chief culprit of global warming. [0004] my country is the world's largest coal producer and consumer. The main energy source in the 21st century is still coal. According to reports,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/81B01D53/62
Inventor 周来徐潇徐书杰茅佳俊刘清
Owner CHINA UNIV OF MINING & TECH
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