JPS5523019A - Manufacture of alpha-type hemihydrate gypsum - Google Patents

Manufacture of alpha-type hemihydrate gypsum

Info

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
Application number
JP9443578A
Other languages
Japanese (ja)
Inventor
Toyoitsu Shimizu
Tsuneo Ishikawa
Takao Awazu
Tokuo Fukita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ishihara Sangyo Kaisha Ltd
Original Assignee
Ishihara Sangyo Kaisha Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ishihara Sangyo Kaisha Ltd filed Critical Ishihara Sangyo Kaisha Ltd
Priority to JP9443578A priority Critical patent/JPS5523019A/en
Publication of JPS5523019A publication Critical patent/JPS5523019A/en
Pending legal-status Critical Current

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  • 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
JP9443578A 1978-08-02 1978-08-02 Manufacture of alpha-type hemihydrate gypsum Pending JPS5523019A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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