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Modified magnesium-based absorbent and preparation method thereof

An absorbent and modification technology, which is applied in the field of modified magnesium-based absorbents and their preparation, can solve problems such as the decline of carbon dioxide absorption capacity, and achieve the effects of increasing carbonation conversion rate, improving anti-sintering ability, and improving stability

Inactive Publication Date: 2020-09-01
WUHAN UNIV OF TECH
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Problems solved by technology

[0009] The second object of the present invention is to provide a preparation method of a modified magnesium-based absorbent, the preparation process is simple and easy to adjust, and it is mainly used to improve the carbonation conversion rate of the adsorbent based on MgO in the long-term cycle, and to solve the problem of the adsorption agent in multiple The problem of the decrease of carbon dioxide absorption capacity after the secondary cycle

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  • Modified magnesium-based absorbent and preparation method thereof

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Embodiment Construction

[0025] For a better understanding of the present invention, the following examples are further descriptions of the present invention, but the content of the present invention is not limited to the following examples.

[0026] This embodiment provides a method for preparing modified magnesium-based absorbent particles, including the following steps:

[0027] At room temperature, first 42g magnesite (MgCO 3 content greater than 80%) and 105g citric acid monohydrate (C 6 h 8 0 7 -H 2 0) Put in a beaker and add 50mL of water and stir to dissolve.

[0028] The molar ratio of magnesium ions to water is preferably ≥10:1, but this is not limited in the present invention, and can be specifically selected according to actual needs.

[0029] Then, it was stirred at a constant temperature of 70° C. for 1.5 hours to form a sol, and then put into a drying oven at 100° C. to dry for 2 hours to form a gel.

[0030] Quickly put the gel into a 75CTC muffle furnace, blow in air, and calcin...

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Abstract

The invention belongs to the technical field of environmental pollution control and clean coal combustion, and particularly relates to a modified magnesium-based absorbent and a preparation method thereof. The preparation method comprises the following steps: (1) putting and dissolving magnesium-containing ore and organic matters into water, stirring to form sol, and drying the sol to form gel; (2) calcining the gel obtained in step (1) at a temperature higher than 500 DEG C to obtain magnesium-based absorbent powder; and (3) uniformly mixing the magnesium-based absorbent powder obtained in step (2) with cement powder, adding a trace amount of water to make the mixed powder become muddy, and extruding and crushing the muddy material into particles to obtain the modified magnesium-based absorbent. The modified magnesium-based absorbent prepared by the method disclosed by the invention can be applied to coal-fired flue gas absorption treatment, is mainly used for improving the carbonation conversion rate of an MgO-based absorbent in long-term circulation, and solves the problem that the carbon dioxide absorption capacity of an auxiliary agent is reduced after the auxiliary agent is circulated for multiple times.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution prevention and clean coal combustion, and specifically relates to a modified magnesium-based absorbent and a preparation method thereof. Background technique [0002] Based on the carbon dioxide (CO2) caused by human activities 2 )-based greenhouse gas emissions are the main cause of the observed global warming. The international community has paid special attention to the reduction of greenhouse gas emissions since the 1990s, and a series of international action frameworks have been gradually established. In recent years, global greenhouse gas emission reduction actions have been carried out in full swing. Since the distribution of carbon emission reduction obligations is related to historical responsibility and fair development, it is also a hot topic in international politics. my country has achieved remarkable results in ecological reconstruction, renewable energy development...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/62B01D53/81C01B32/55
CPCB01D53/62B01D53/81B01D2251/402B01D2251/602B01D2257/504B01D2258/0283C01B32/55Y02P20/151
Inventor 吴汇哲陈奔
Owner WUHAN UNIV OF TECH