Desulfurizing agent and preparation method thereof

A desulfurization agent and fly ash technology, applied in the field of flue gas purification, can solve problems such as low desulfurization efficiency, incomplete reaction, and blockage

Inactive Publication Date: 2011-04-13
蒋历辉 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For calcium-based desulfurizers, due to SO 2 with Ca(OH) 2 The desulfurization reaction is in Ca(OH) 2 on the solid surface, while Ca(OH) 2 The outermost ...

Method used

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  • Desulfurizing agent and preparation method thereof
  • Desulfurizing agent and preparation method thereof

Examples

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Embodiment 1

[0021] This patent uses a ball mill to grind the fly ash, and the grinding process is to make the SiO with larger particle size in the fly ash 2 and Al 2 o 3 Grinding into dense fine chips, and dispersing the cohesive fly ash into single particles, so that the particles with larger particle sizes are greatly reduced, and the grinding time is 2-3h. Then use a standard test sieve to sieve it, and select fly ash with a particle size between 100 mesh and 200 mesh for the experiment.

[0022] Add 5-10% Ca(OH) to the above fly ash 2 (Mass percentage, all percentages in the text are mass percentages) Lime water was subjected to hydrothermal treatment at 130° C. for 4 hours. Under hydrothermal conditions, fly ash and Ca(OH) 2 The reaction occurs to partially dissolve the silica and alumina inside the fly ash, and flocculate on the surface to form the core of calcium aluminosilicate. After fully growing, it is deposited on the surface of the fly ash to form incompletely crystallize...

Embodiment 2

[0025] Use a ball mill to grind the fly ash, so as to disperse the cohesive fly ash into single particles, and crush the larger particles into smaller particles. The grinding time is 2-3h. Then use a standard test sieve to sieve it, and select fly ash with a particle size between 100 mesh and 200 mesh for the experiment.

[0026] Add 10% Ca(OH) to the above fly ash 2 Lime water is subjected to hydrothermal treatment at 130°C for 6-8 hours. Under hydrothermal conditions, fly ash and Ca(OH) 2The reaction occurs to partially dissolve the silica and alumina inside the fly ash, and flocculate on the surface to form the core of calcium aluminosilicate. After fully growing, it is deposited on the surface of the fly ash to form incompletely crystallized hydrated silica-alumina Salt, control the solid-phase hydrothermal reaction process, make the hydrated aluminosilicate bridge in a fibrous form, and then make the fly ash carrier form a porous structure. This structure has a large s...

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Abstract

The invention provides a calcium based desulfurizing agent loaded by coal ash and a preparation method thereof. Aiming at the problems of low absorbing agent utilization rate, large consumption and the like of the traditional dry method flue gas desulfurization process, the efficient calcium based desulfurizing agent loaded by the coal ash is prepared by using the coal ash, Ca(OH)2 and an activating agent as main raw materials through a solid phase reaction/hydrothermal combination reaction process. The coal ash waste of the traditional coal industries is fully utilized, and structurally modified to be used for treating SO2 waste gas, thus the invention has the advantages of simple preparation process and low cost; and the prepared desulfurizing agent has high desulfuration efficiency and no sewage during the desulfuration and does not produce the secondary pollution.

Description

technical field [0001] The invention relates to a calcium-based desulfurizer loaded by fly ash and a preparation method thereof, and relates to the technical field of flue gas purification. Background technique [0002] At present, my country has become the world's SO 2 One of the main countries of emissions. According to the "China Environmental Status Bulletin", in 2002, my country's urban air quality was still at a relatively serious pollution level, SO 2 The annual average concentration is 3~248μg / m 3 range, the national annual average is 66 μg / m 3 ; 72 μg / m in northern cities 3 ; 60 μg / m in southern cities 3 . SO 2 The acid rain caused by the discharge is almost like a prairie fire in our country, and the damage area has accounted for about 29% of the country's land area, and it is increasing year by year. The annual direct economic loss caused by acid rain is as high as 14 billion yuan in the eight southern provinces alone. However, my country's power supply m...

Claims

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Application Information

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IPC IPC(8): B01D53/50
Inventor 唐新村蒋历辉刘祥龙曾智文李思梅宋建超
Owner 蒋历辉
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