JPS56114824A - Preparation of calcined gypsum - Google Patents
Preparation of calcined gypsumInfo
- 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
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
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) |
-
1980
- 1980-02-14 JP JP55017561A patent/JPS585848B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS585848B2 (en) | 1983-02-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS57172956A (en) | Tar-like material dispersion composition and production thereof | |
JPS56114824A (en) | Preparation of calcined gypsum | |
JPS5527824A (en) | Production of alumina sol | |
JPS565056A (en) | Feed additive for cultured aquatic life | |
JPS532383A (en) | Treatment of sludge contained oil | |
JPS5271433A (en) | Preparation of aromatic polycarboxylic acid arylester | |
JPS5297389A (en) | Removal of sulfate ion in extracted phosphoric acid | |
JPS57135715A (en) | Preparation of porous modified sepiolite | |
JPS57118769A (en) | Preparation of ground fish meat | |
JPS5513738A (en) | Rubber composition | |
JPS5210231A (en) | Preparation of isomorphic crystals of 2,4-bis(2'-acetoxy benzamido) be nzoic acid | |
JPS5618933A (en) | Dihydroxy aluminum salt of substituted acetic acid and its preparation | |
JPS5231023A (en) | Drying process of malic acid disodium salt hydrate | |
JPS5734014A (en) | Production of cordierite composition powder | |
JPS57132855A (en) | Improved noodle | |
JPS5577877A (en) | High-quality fish paste | |
JPS56133236A (en) | Sodium valproate clathrate | |
JPS56144060A (en) | Antioxidant for feed | |
JPS5579383A (en) | Preparation of high purity sorbitan | |
JPS5439063A (en) | Preparation of nitroanthraquinone | |
JPS5511029A (en) | Production of moisture containing coagulated alginate | |
JPS52111893A (en) | Water treating agent | |
JPS5219622A (en) | Process for preparation of tartaric acid salts | |
JPS5561933A (en) | Deoxygenating composition | |
JPS56139428A (en) | Preparation of isobutylene low polymer |