JPS5532789A - Production of hexagonal prismatic crystal alpha-type hemihydrate gypsum - Google Patents
Production of hexagonal prismatic crystal alpha-type hemihydrate gypsumInfo
- Publication number
- JPS5532789A JPS5532789A JP10380679A JP10380679A JPS5532789A JP S5532789 A JPS5532789 A JP S5532789A JP 10380679 A JP10380679 A JP 10380679A JP 10380679 A JP10380679 A JP 10380679A JP S5532789 A JPS5532789 A JP S5532789A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- production
- caso
- pref
- sol
- 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 obtain the title gypsum with high dry compressive strength and a uniform crystal form in a high yield by adding a habit modifier and a sol. metal salt for accelerating oxidation and growing crystals to a CaSO3 slurry of a specified concn. obtd. by allowing SOx in exhaust gas to be absorbed in a lime slurry, followed by treatment under restricted conditions.
CONSTITUTION: SOx in exhaust gas are allowed to be absorbed in a lime slurry, and the CaSO3 concn. of the slurry is adjusted to below about 10%. To this slurry are added 0.01W1% of a habit modifier such as sodium citrate effective in growth of prismatic crystals and 0.01W1% of a sol. metal salt, esp. NiSO4 or Fe2(SO4)3 for accelerating oxidation and promoting crystal growth. The mixed slurry is then adjusted to pH 3W4, oxidized with air or the like at about 120W150, pref. 120W 130°C and above 2 kg/cm2 while stirring, rapidly filtered at the hot state, and rapidly dried with hot air at above 90, pref. 120W130°C.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10380679A JPS5532789A (en) | 1979-08-14 | 1979-08-14 | Production of hexagonal prismatic crystal alpha-type hemihydrate gypsum |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10380679A JPS5532789A (en) | 1979-08-14 | 1979-08-14 | Production of hexagonal prismatic crystal alpha-type hemihydrate gypsum |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP50039673A Division JPS5838363B2 (en) | 1975-03-31 | 1975-03-31 | Alfa Gatahansuisetsukou Oseizosurhouhou |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5532789A true JPS5532789A (en) | 1980-03-07 |
JPS6128608B2 JPS6128608B2 (en) | 1986-07-01 |
Family
ID=14363638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10380679A Granted JPS5532789A (en) | 1979-08-14 | 1979-08-14 | Production of hexagonal prismatic crystal alpha-type hemihydrate gypsum |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5532789A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008142111A1 (en) * | 2007-05-24 | 2008-11-27 | Basf Se | Use of hydrophobins as additives in the crystallization of solids |
US8096484B2 (en) | 2006-08-15 | 2012-01-17 | Basf Se | Method for the production of dry free-flowing hydrophobin preparations |
-
1979
- 1979-08-14 JP JP10380679A patent/JPS5532789A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8096484B2 (en) | 2006-08-15 | 2012-01-17 | Basf Se | Method for the production of dry free-flowing hydrophobin preparations |
WO2008142111A1 (en) * | 2007-05-24 | 2008-11-27 | Basf Se | Use of hydrophobins as additives in the crystallization of solids |
Also Published As
Publication number | Publication date |
---|---|
JPS6128608B2 (en) | 1986-07-01 |
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