JPS5523019A - Manufacture of alpha-type hemihydrate gypsum - Google Patents
Manufacture of alpha-type hemihydrate gypsumInfo
- Publication number
- JPS5523019A JPS5523019A JP9443578A JP9443578A JPS5523019A JP S5523019 A JPS5523019 A JP S5523019A JP 9443578 A JP9443578 A JP 9443578A JP 9443578 A JP9443578 A JP 9443578A JP S5523019 A JPS5523019 A JP S5523019A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- slurry
- parts
- added
- seed
- 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 obtain α-type hemihydrate gypsum causing no lowering in strength and no efflorescence phenomenon by adding a habit modifier, sodium chloride, calcium chloride and a needlelike hemihydrate gypsum seed to a gypsum slurry followed by heating under atmospheric press.
CONSTITUTION: To a gypsum slurry contg. an adequate amt. of a habit modifier are added 2W3 parts by wt. of sodium chloride and 10W18 parts of calcium chloride to 100 parts of water in the slurry. Needlelike himihydrate gypsum of 1W2μ minor axis and 10W30μ major axis is further added as a seed in an amt. of 0.3W1 part to 100 parts of gypsum. The slurry is then heated at the transition temp.Wthe b.p. under atmospheric press. to obtain prismatic or platelike α-type hemihydrate gypsum. The seed may be added in the form of a slurry or powder, yet it is pref. added when the temp. of the gypsum slurry reaches the transition temp.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9443578A JPS5523019A (en) | 1978-08-02 | 1978-08-02 | Manufacture of alpha-type hemihydrate gypsum |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9443578A JPS5523019A (en) | 1978-08-02 | 1978-08-02 | Manufacture of alpha-type hemihydrate gypsum |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5523019A true JPS5523019A (en) | 1980-02-19 |
Family
ID=14110163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9443578A Pending JPS5523019A (en) | 1978-08-02 | 1978-08-02 | Manufacture of alpha-type hemihydrate gypsum |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5523019A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100371279C (en) * | 2006-06-06 | 2008-02-27 | 宁夏建筑材料研究院 | Method for producing alpha semi-hydrated gypsum in high intensity, and low expansion |
-
1978
- 1978-08-02 JP JP9443578A patent/JPS5523019A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100371279C (en) * | 2006-06-06 | 2008-02-27 | 宁夏建筑材料研究院 | Method for producing alpha semi-hydrated gypsum in high intensity, and low expansion |
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