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Method for removing impurities from desulphurization gypsum of power plant
The invention relates to a method for removing impurities from desulphurization gypsum of a power plant. The invention adopts a reversible conversion principle that dihydrate gypsum can be rapidly dissolved, re-crystallized and converted into alpha-hemihydrate gypsum under the conditions that temperature is higher than or equal to 120 DEG C, pressure is higher than or equal to 0.15MPa, a pH value is 2.5-7 and an additive exists, and the alpha-hemihydrate gypsum can be also rapidly converted into dihydrate gypsum when being cooled in a water environment. The method for removing the impurities from the desulphurization gypsum of the power plant comprises the following steps: sieving a raw material for filtering out large-particle impurities; preparing reaction slurry, and carrying out water type hot pressing reaction, so that dihydrate gypsum is rapidly converted into alpha-hemihydrate gypsum; standing, and cooling, wherein alpha-hemihydrate gypsum in the slurry is converted into relatively large dihydrate gypsum particles; removing impurities to obtain a relatively pure gypsum material; carrying out water filtration to further remove small impurity particles and harmful soluble salt in gypsum; and obtaining slurry and a wet body or drying to obtain powder according to follow-up needs. The method for removing the impurities from the desulphurization gypsum of the power plant can be taken as a gypsum raw material purification process in preparation of calcium sulphate whiskers by virtue of the desulphurization gypsum, and can also be taken as a method for producing high-whiteness gypsum. The method for removing the impurities from the desulphurization gypsum of the power plant is simple, efficient and easy for mass production.
Method for removing impurities from desulphurization gypsum of power plant
The invention relates to a method for removing impurities from desulphurization gypsum of a power plant. The invention adopts a reversible conversion principle that dihydrate gypsum can be rapidly dissolved, re-crystallized and converted into alpha-hemihydrate gypsum under the conditions that temperature is higher than or equal to 120 DEG C, pressure is higher than or equal to 0.15MPa, a pH value is 2.5-7 and an additive exists, and the alpha-hemihydrate gypsum can be also rapidly converted into dihydrate gypsum when being cooled in a water environment. The method for removing the impurities from the desulphurization gypsum of the power plant comprises the following steps: sieving a raw material for filtering out large-particle impurities; preparing reaction slurry, and carrying out water type hot pressing reaction, so that dihydrate gypsum is rapidly converted into alpha-hemihydrate gypsum; standing, and cooling, wherein alpha-hemihydrate gypsum in the slurry is converted into relatively large dihydrate gypsum particles; removing impurities to obtain a relatively pure gypsum material; carrying out water filtration to further remove small impurity particles and harmful soluble salt in gypsum; and obtaining slurry and a wet body or drying to obtain powder according to follow-up needs. The method for removing the impurities from the desulphurization gypsum of the power plant can be taken as a gypsum raw material purification process in preparation of calcium sulphate whiskers by virtue of the desulphurization gypsum, and can also be taken as a method for producing high-whiteness gypsum. The method for removing the impurities from the desulphurization gypsum of the power plant is simple, efficient and easy for mass production.
Method for removing impurities from desulphurization gypsum of power plant
ZHANG FENGYI (author) / CHENG RUNXI (author) / ZHANG GUOLIANG (author) / CAI SHUWU (author) / LIU LIHUI (author) / WU XIUQUN (author) / ZHOU XIAOGUO (author) / DENG JUNWEI (author)
2015-04-08
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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