JPS56114824A - Preparation of calcined gypsum - Google Patents

Preparation of calcined gypsum

Info

Publication number
JPS56114824A
JPS56114824A JP1756180A JP1756180A JPS56114824A JP S56114824 A JPS56114824 A JP S56114824A JP 1756180 A JP1756180 A JP 1756180A JP 1756180 A JP1756180 A JP 1756180A JP S56114824 A JPS56114824 A JP S56114824A
Authority
JP
Japan
Prior art keywords
gypsum
sulfonic acid
lime
aromatic sulfonic
calcined gypsum
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.)
Granted
Application number
JP1756180A
Other languages
Japanese (ja)
Other versions
JPS585848B2 (en
Inventor
Masaru Morikawa
Muneaki Yamaguchi
Hiroko Tanaka
Hiromasa Ogawa
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.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
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 Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Priority to JP55017561A priority Critical patent/JPS585848B2/en
Publication of JPS56114824A publication Critical patent/JPS56114824A/en
Publication of JPS585848B2 publication Critical patent/JPS585848B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To prepare calcined gypsum of completely platy crystals, by heat-treating a gypsum slurry containing an aromatic sulfonic acid and lime under pressure.
CONSTITUTION: Lime, e.g. quick lime, is mixed with an aqueous solution of an aromatic sulfonic acid, e.g. toluenesulfonic acid, and gypsum and water are further added to the mixture. The resultant mixture (solid content: about 1W30wt%) is heat-treated at 100°C or above, preferably 110W150°C, under a pressure of about 1W8kg/cm2 with agitation for about 5W180min, filtered, washed and dried to give calcined gypsum of platy crystals. The amount of the aromatic sulfonic acid is 0.5pt.wt. or more, preferably 1W10pts.wt., based on 100pts.wt. gypsum, and the amount of the lime is about 0.5mol or more, preferably 3W7.5mol, based on 1mol aromatic sulfonic acid.
COPYRIGHT: (C)1981,JPO&Japio
JP55017561A 1980-02-14 1980-02-14 How to make baked gypsum Expired JPS585848B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55017561A JPS585848B2 (en) 1980-02-14 1980-02-14 How to make baked gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55017561A JPS585848B2 (en) 1980-02-14 1980-02-14 How to make baked gypsum

Publications (2)

Publication Number Publication Date
JPS56114824A true JPS56114824A (en) 1981-09-09
JPS585848B2 JPS585848B2 (en) 1983-02-02

Family

ID=11947315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55017561A Expired JPS585848B2 (en) 1980-02-14 1980-02-14 How to make baked gypsum

Country Status (1)

Country Link
JP (1) JPS585848B2 (en)

Also Published As

Publication number Publication date
JPS585848B2 (en) 1983-02-02

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