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Preparation method of calcium hydroxide with high specific surface area for dry desulfurization

A technology of high specific surface area and calcium hydroxide is applied in the field of preparation of calcium hydroxide to achieve the effect of reducing production costs

Inactive Publication Date: 2012-02-22
CHANGSHU DAZHONG CALCIFIC OBJECTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium hydroxide is usually used for dry desulfurization agent. The advantages of this method are: simple operation; small space occupied by the device, solid product, no secondary pollution, but only low utilization rate of desulfurization agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The content of calcium oxide in the limestone is 54%, the particle size of the quick lime entering the digester is 3 mm, the ratio of quick lime and water: 1: 0.47, the water temperature of the digested water is room temperature (about 25 ° C), the rotating speed of the classifier is 800 rpm, and the obtained calcium hydroxide passes through. 250 mesh standard sieve is 95%, specific surface area is 12.06m 2 / g.

Embodiment 2

[0036] The calcium oxide content in the limestone is 54%, the particle size of the quicklime entering the digester is 3mm, the ratio of quicklime to water (the digested water contains 2% of an organic amine and 1% of sodium carbonate): 1:0.47, and the water temperature of the digested water is room temperature (about 25%). ℃), the rotating speed of the classifier is 800 rev / min, the obtained calcium hydroxide is 95% through the 250-mesh standard sieve, and the specific surface area is 21.81m 2 / g.

Embodiment 3

[0038] The calcium oxide content in the limestone is 54%, the particle size of the quicklime entering the digester is 3mm, the ratio of quicklime and water (the digested water contains a trivalent alcohol 2%, and the sodium carbonate 1%): 1:0.47, and the water temperature of the digested water is room temperature (about 25°C), the rotating speed of the classifier is 800 rpm, the obtained calcium hydroxide is 95% through a 250-mesh standard sieve, and the specific surface area is 18.99.81m 2 / g.

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Abstract

The invention discloses a method for preparing calcium hydroxide with high specific surface area for dry desulfurization, which comprises the following steps: 1) Calcining limestone and anthracite to produce calcium oxide; , water reacts with calcium oxide in a spray state; 3) calcium hydroxide passes through a vibrating screen, and the gained calcium hydroxide enters a finished product storage bin; 4) sampling, and measuring the specific surface area of ​​the calcium hydroxide finished product on a nitrogen adsorption specific surface meter; The digested water adopted in step 2) contains organic amine or / and polyhydric alcohol / inorganic sodium salt below 2.0%; the specific surface area of ​​the calcium hydroxide manufactured by the method of the present invention is adjustable, and the prepared specific surface area reaches 15-30m2 / g Calcium hydroxide, according to the composition of the flue gas, provides calcium hydroxide with different specific surface areas to meet the requirements of desulfurization and reduce production costs.

Description

technical field [0001] The invention relates to a preparation method of calcium hydroxide, in particular to a preparation method of calcium hydroxide with high specific surface area for dry desulfurization. Background technique [0002] At present, attention to environmental issues has attracted worldwide attention, and the issue of air pollution, especially the reduction of sulfur dioxide emissions, is not a new task. my country's total annual discharge of sulfur dioxide has greatly exceeded the self-purification capacity of the environment, causing nearly 1 / 3 of the country's land to be seriously polluted by acid rain. Since my country is a major primary energy consumer mainly based on coal, The direct combustion of coal has caused serious "soot pollution" (smoke and sulfur dioxide) in my country. Therefore, the implementation of flue gas desulfurization and reduction of sulfur dioxide emissions will greatly improve air quality, optimize the ecological environment, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50
Inventor 薛用芳王世珍吴志芳常培元
Owner CHANGSHU DAZHONG CALCIFIC OBJECTS
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