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Method for preparing high-specific surface area calcium hydroxide for dry desulphurization

A high specific surface area, calcium hydroxide technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problem of low utilization rate of desulfurizers, and achieve the effect of reducing production costs

Inactive Publication Date: 2010-07-14
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

preparation example Construction

[0015] The preparation method of calcium hydroxide with high specific surface area for dry desulfurization of the present invention comprises the following steps:

[0016] 1) calcining limestone with calcium oxide ≥ 54% and anthracite in a weight ratio of 1:0.07-0.1 to generate calcium oxide;

[0017] 2) The coal ash is removed by the vibrating screen, and then crushed by the crusher and then enters the digester. The digested water in the digester reacts with calcium oxide in a spray state and is stirred at a speed of 500 rpm-1000 rpm to ensure that the calcium oxide The hydration time is 15-55 minutes, and the mass ratio of water to calcium oxide is controlled in the range of 0.4-0.8 according to the difference of limestone;

[0018] 3) Calcium hydroxide from the digester passes through a vibrating sieve, and the under-sieve enters the classifier. By adjusting the speed of the classifier at 500 rpm-1000 rpm, the coarse undigested calcium oxide is separated, and the obtained c...

Embodiment 1

[0031] The calcium oxide content in the limestone is 54%, the particle size of quicklime entering the digester is 3mm, the ratio of quicklime to water: 1:0.47, the temperature of the digested water is room temperature (about 25°C), the speed of the classifier is 800 rpm, and the obtained calcium hydroxide passes through The 250-mesh standard sieve is 95%, and the specific surface area is 12.06m 2 / g.

Embodiment 2

[0033] Calcium oxide content in the limestone is 54%, the particle size of quicklime entering the digester is 3mm, the ratio of quicklime to water (digested water contains 2% of an organic amine, 1% of sodium carbonate) is 1:0.47, and the temperature of the digested water is room temperature (about 25 ℃), classifier rotating speed 800 rev / min, gained calcium hydroxide is 95% through 250 mesh standard sieves, specific surface area is 21.81m 2 / g.

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Abstract

The invention relates to a method for preparing high-specific surface area calcium hydroxide for dry desulphurization, which comprises the following steps of: (1) carrying out calcination on lime stone and anthracite to generate calcium oxide; (2) passing through a vibrating screen, breaking by a breaking machine, entering a digesting device and enabling water to act with the calcium oxide in a spraying state; (3) leading calcium hydroxide to pass through the vibrating screen and leading the obtained calcium hydroxide to enter a finished product storing bin; (4) sampling and measuring the specific surface area of a calcium hydroxide finished product on a nitrogen absorbing specific surface area instrument, wherein the digesting water adopted in the step (2) contains smaller than 2.0 percent of organic amine or / and polyalcohol / inorganic sodium salt. The specific surface area of the calcium hydroxide prepared by the method is adjustable, the calcium hydroxide with the specific surface area of 15-30m2 / g is prepared, and the calcium hydroxide with different specific surface area is provided according to the composition of smoke to reach the use requirement of desulphurization; and meanwhile, the production cost is also reduced.

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 severely 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 im...

Claims

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Application Information

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IPC IPC(8): C01F11/02
Inventor 薛用芳王世珍吴志芳常培元
Owner CHANGSHU DAZHONG CALCIFIC OBJECTS
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