JPS55113621A - Manufacture of alpha hemihydrate gypsum - Google Patents
Manufacture of alpha hemihydrate gypsumInfo
- Publication number
- JPS55113621A JPS55113621A JP1940079A JP1940079A JPS55113621A JP S55113621 A JPS55113621 A JP S55113621A JP 1940079 A JP1940079 A JP 1940079A JP 1940079 A JP1940079 A JP 1940079A JP S55113621 A JPS55113621 A JP S55113621A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- gypsum
- hemihydrate gypsum
- vessel
- fed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
PURPOSE: To efficiently manufacture α-type hemihydrate gypsum without passing through a reaction under strongly acidic conditions by forming a gypsum slurry in an oxidation tower in a wet desulfurization process and treating the slurry at pH 5W8 and 90W150°C.
CONSTITUTION: A limestone slurry from tank 1 and sulfur dioxide in exhaust gas 4 are reacted in absorption tower 3 to form calcium sulfite and gypsum. The resulting slurry is adjusted to pH about 4W5.5 in pH adjusting vessel 7 and fed to oxidation tower 10, where the calcium sulfite is oxidized to gypsum with air 11 introduced. This gypsum-base slurry is then fed to reaction vessel 14 and retained at about 90W 150°C for about 30minW2hr to convert the gyspum into α-type hemihydrate gypsum while adjusting the slurry in vessel 14 to pH 5W8 with the limestone slurry from tank 1. The hemihydrate gypsum is separated from the slurry with separator 17 and taken out.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1940079A JPS55113621A (en) | 1979-02-21 | 1979-02-21 | Manufacture of alpha hemihydrate gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1940079A JPS55113621A (en) | 1979-02-21 | 1979-02-21 | Manufacture of alpha hemihydrate gypsum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55113621A true JPS55113621A (en) | 1980-09-02 |
Family
ID=11998214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1940079A Pending JPS55113621A (en) | 1979-02-21 | 1979-02-21 | Manufacture of alpha hemihydrate gypsum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55113621A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57205318A (en) * | 1981-05-18 | 1982-12-16 | Steag Ag | Manufacture of calcium sulfate 0.5 hydrate from combustion exhaust gas |
| US4503020A (en) * | 1982-10-30 | 1985-03-05 | Gottfried Bischoff Bau kompl. Gasreinigungs- und Wasserr/u/ ckk/u/ hlanlagen GmbH & Co. Kommanditgesellschaft | Method of producing calcium sulfate semihydrate in conjunction with the desulfurization of flue gases |
| JPS6172625A (en) * | 1984-09-17 | 1986-04-14 | Kureha Chem Ind Co Ltd | Production of alpha type hemihydrate |
| KR100443246B1 (en) * | 2001-10-29 | 2004-08-04 | 한국전력공사 | The Manufacturing Method of α-Calcium Sulfate Hemihydrate from FGD Gypsum by Heating under Reduced Pressure |
-
1979
- 1979-02-21 JP JP1940079A patent/JPS55113621A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57205318A (en) * | 1981-05-18 | 1982-12-16 | Steag Ag | Manufacture of calcium sulfate 0.5 hydrate from combustion exhaust gas |
| US4503020A (en) * | 1982-10-30 | 1985-03-05 | Gottfried Bischoff Bau kompl. Gasreinigungs- und Wasserr/u/ ckk/u/ hlanlagen GmbH & Co. Kommanditgesellschaft | Method of producing calcium sulfate semihydrate in conjunction with the desulfurization of flue gases |
| JPS6172625A (en) * | 1984-09-17 | 1986-04-14 | Kureha Chem Ind Co Ltd | Production of alpha type hemihydrate |
| JPH0140769B2 (en) * | 1984-09-17 | 1989-08-31 | Kureha Chemical Ind Co Ltd | |
| KR100443246B1 (en) * | 2001-10-29 | 2004-08-04 | 한국전력공사 | The Manufacturing Method of α-Calcium Sulfate Hemihydrate from FGD Gypsum by Heating under Reduced Pressure |
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