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Method for recycling semi-dry process desulphurization byproduct sodium sulfate

A technology for semi-dry desulfurization and desulfurization by-products, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal compounds, etc., can solve the problem of consuming large manpower, material and financial resources, secondary pollution, Environmental hazards and other issues, to achieve the effect of realizing circular economy, reducing total emissions, and solving environmental problems

Inactive Publication Date: 2013-10-09
HUAERRUN GLASS IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these wastes are not handled properly, on the one hand, they will occupy a large area of ​​land, and on the other hand, they will also cause secondary pollution and cause harm to the environment.
At present, these solid wastes are transported as domestic waste, which requires a lot of manpower, material and financial resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: a kind of semi-dry process desulfurization by-product sodium sulfate recycling method, the method comprises the steps:

[0012] (1) Sodium sulfate, a by-product of desulfurization, was dissolved in water to make a solution, the mass concentration of the solution was 20%, the temperature was controlled at 20-30°C, and then bubbling aeration was carried out for oxidation, and the aeration time was 40 minutes;

[0013] (2) Filter the mixed solution after aeration, then send the obtained filtrate to the evaporation device for evaporation and crystallization treatment, stop heating when crystals are precipitated, and then cool down to 18°C ​​to cool and crystallize to obtain a saturated crystal slurry;

[0014] (3) Centrifuge the above-mentioned saturated crystal slurry to obtain centrifuged liquid and sodium sulfate crystals, then dry the sodium sulfate crystals to finally obtain anhydrous sodium sulfate crystals, dry the obtained crystals and carry out composi...

Embodiment 2

[0015] Embodiment 2: a kind of semi-dry process desulfurization by-product sodium sulfate recycling method, the method comprises the steps:

[0016] (1) Sodium sulfate, a by-product of desulfurization, is dissolved in water to make a solution, the mass concentration of the solution is 30%, the temperature is controlled at 20-30°C, and then bubbling aeration oxidation is carried out, and the aeration time is 60 minutes;

[0017] (2) Filter the mixed solution after aeration, then carry out aeration and oxidation treatment on the obtained filtrate for 20~30 minutes, and then send it to the evaporation device for evaporation and crystallization treatment, stop heating when crystals are precipitated, and then cool down to 18°C Cooling crystallization obtains saturated magma;

[0018] (3) Centrifuge the above-mentioned saturated crystal slurry to obtain centrifuged liquid and sodium sulfate crystals, then dry the sodium sulfate crystals to finally obtain anhydrous sodium sulfate cry...

Embodiment 3

[0019] Example 3: The anhydrous sodium sulfate crystals after drying in Example 2 are used as a raw material to replace Glauber's salt in a 10% weight ratio to carry out a glass production test. The roasting temperature is 1480 ° C. After 1 hour of heat preservation, it is poured out and cooled to remove microbes. Except that there are more bubbles, there is no obvious difference compared with the original glass. Therefore, it can be concluded that the recovered anhydrous sodium sulfate crystals can be used as raw materials, thereby reducing production costs.

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PUM

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Abstract

The invention discloses a method for recycling semi-dry process desulphurization byproduct sodium sulfate. The method comprises the following steps of: dissolving the desulphurization byproduct sodium sulfate in water to prepare solution, wherein the mass concentration of the solution is 20 to 30 percent, and the temperature of the solution is 20 to 30 DEG C, bubbling, aerating and oxidating, wherein the aeration time is 40 to 60 minutes; and filtering the aerated mixed solution, conveying the obtained filtrate into an evaporation device, evaporating and crystallizing, when crystals are separated out, stopping heating, cooling to 18 DEG C, and cooling and crystallizing to obtain saturated crystal mush; and performing solid and liquid centrifugal separation to obtain centrifugate and sodium sulfate crystals, and drying the sodium sulfate crystals to finally obtain the anhydrous sodium sulfate crystals. The method has the advantages of feasibility, and by the method, industrial production can be realized; and the anhydrous sodium sulfate crystals are prepared from the desulphurization byproduct, so that the problem of stacking of the semi-dry process desulphurization byproduct is solved, and the recycled product anhydrous sodium sulfate crystals can be used as a glass raw material, and circular economy can be realized.

Description

technical field [0001] The invention relates to a method for treating by-products of semi-dry desulfurization, in particular to a method for recycling and utilizing sodium sulfate, a by-product of semi-dry desulfurization. Background technique [0002] Although the sulfur dioxide in the flue gas can be well treated, the amount of solid waste generated is very large. According to statistics, the flue gas desulfurization of the first, second, third and seventh lines of our company is a semi-dry process (sodium-alkali method), and a total of nearly 50 tons of desulfurization by-products are produced every day. The main components are: sodium sulfate, sodium sulfite, sodium sulfide ( The content of the three is above 90%). If these wastes are not handled properly, on the one hand, they will occupy a large area of ​​land, and on the other hand, they will also cause secondary pollution and cause harm to the environment. At present, these solid wastes are transported as domestic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C01D5/00
Inventor 葛训韩艺博徐永高卞宏建谢慧
Owner HUAERRUN GLASS IND