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A method for preparing hollow rod-shaped hemihydrate gypsum from desulfurized gypsum

A technology for desulfurized gypsum and hemihydrate gypsum, applied in the field of gypsum, can solve the problems of limited application scope and potential application value, narrow particle distribution band, high water content, and achieve broad scientific research and application prospects, narrow diameter range distribution, and whiteness. improved effect

Inactive Publication Date: 2016-08-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Desulfurization gypsum has a series of advantages, such as its high taste, the main component is the same as natural gypsum, calcium sulfate dihydrate, its hydration kinetics and coagulation characteristics are the same as natural gypsum, and it is non-radioactive; but because its original physical state is separate The crystalline particles have a narrow particle distribution band and poor gradation. In addition, their high water content and complex impurity components greatly limit their application range and potential application value.
[0003] At present, with the gradual adoption of flue gas desulfurization technology in my country, the output of desulfurized gypsum is also increasing rapidly, of which a small amount of desulfurized gypsum is buried in saline-alkali land for the improvement of saline-alkali land, but most of the desulfurized gypsum is stored as Mainly, this will not only occupy land resources, but also cause secondary pollution to the environment. Therefore, it is extremely important to effectively utilize resources
[0004] At present, the research on desulfurized gypsum is mainly carried out by the salt solution method, that is, the desulfurized gypsum is placed in a suitable salt solution, and it is converted into hemihydrate gypsum under high temperature and pressure. This method requires high equipment , the process is relatively complicated, the energy consumption is large, and the impurity removal is not thorough

Method used

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  • A method for preparing hollow rod-shaped hemihydrate gypsum from desulfurized gypsum
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  • A method for preparing hollow rod-shaped hemihydrate gypsum from desulfurized gypsum

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Effect test

Embodiment 1

[0022] Take 3g of desulfurized gypsum, sieve through a 230 mesh sieve to obtain desulfurized gypsum fine powder, then take 6ml of alcohol with a mass fraction of 99%, and 5ml of hydrochloric acid with a mass fraction of 36%, add them in sequence, mix and stir, and prepare the original slurry , put it into a water bath, keep it warm at normal pressure and 80°C for 30 minutes, put the slurry into a centrifuge and centrifuge it at 10,000 r / s for 10 minutes, take out the centrifuged slurry, pour off its supernatant, and get The white solid was put into a drying oven, and after drying at 70° C., the final hollow rod-shaped hemihydrate gypsum was obtained.

Embodiment 2

[0024] Take 1g of desulfurized gypsum, sieve through a 230 mesh sieve to obtain desulfurized gypsum fine powder, then take 5ml of alcohol with a mass fraction of 99%, and 2ml of hydrochloric acid with a mass fraction of 36%, add them in sequence, mix and stir, and prepare the original slurry , put it in a water bath, keep it warm at normal pressure and 90°C for 20 minutes, put the slurry into a centrifuge and centrifuge at 10,000 r / s for 5 minutes, take out the centrifuged slurry, pour off its supernatant, and get The white solid was put into a drying oven, and after drying at 60° C., the final hollow rod-shaped hemihydrate gypsum was obtained.

Embodiment 3

[0026] Take 0.5g of desulfurized gypsum, sieve through a 230 mesh sieve to obtain desulfurized gypsum fine powder, then take 5ml of alcohol with a mass fraction of 99%, and 3ml of hydrochloric acid with a mass fraction of 36%, add them in sequence, mix and stir, and prepare the original slurry Put the material into a water bath, keep it warm at normal pressure and 85°C for 25 minutes, put the slurry into a centrifuge and centrifuge at 10,000 r / s for 5 minutes, take out the centrifuged slurry, pour off the supernatant, and The obtained white solid was put into a drying oven, and after drying at 50° C., the final hollow rod-shaped hemihydrate gypsum was obtained.

[0027] The obtained hollow rod-shaped hemihydrate gypsum of above-mentioned embodiment 1-3 is basically similar, all can refer to attached Figure 4-6 .

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Abstract

The invention discloses a method for preparing hollow rod-shaped semi-hydrated gypsum by using desulphurization stone and belongs to the technical field of gypsum. The method comprises the steps of taking materials, ball milling, drying, sieving, acidifying through alcohol, centrifuging and drying; the hollow rod-shaped semi-hydrated gypsum with wide application prospect serves as the main component of the prepared product. Compared with the raw material which is desulphurization gypsum, the impurities of the modified product are almost thoroughly removed; the whiteness is obviously improved; the shape is greatly changed; the main component is changed into semi-hydrated gypsum which has extremely wide scientific research and application prospects.

Description

Technical field: [0001] The invention discloses a method for preparing hollow rod-shaped gypsum from desulfurized gypsum, which specifically belongs to a modification process of desulfurized gypsum, solves many problems restricting the actual or potential application of desulfurized gypsum, and belongs to the technical field of gypsum. Background technique: [0002] Desulfurization gypsum, also known as FGD gypsum, is an industrial by-product gypsum, which is produced in the process of removing sulfur dioxide from flue gas with limestone in power plants, oil refineries and other industrial enterprises. Desulfurization gypsum has a series of advantages, such as its high taste, the main component is the same as natural gypsum, calcium sulfate dihydrate, its hydration kinetics and coagulation characteristics are the same as natural gypsum, and it is non-radioactive; but because its original physical state is separate The crystalline particles have narrow particle distribution b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/02
Inventor 王金淑张晓菲吴俊书李洪义杜玉成贾新建赵冰心
Owner BEIJING UNIV OF TECH
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