GB1246664A - Method of manufacturing calcium sulphate hemi-hydrate - Google Patents
Method of manufacturing calcium sulphate hemi-hydrateInfo
- Publication number
- GB1246664A GB1246664A GB31603/68A GB3160368A GB1246664A GB 1246664 A GB1246664 A GB 1246664A GB 31603/68 A GB31603/68 A GB 31603/68A GB 3160368 A GB3160368 A GB 3160368A GB 1246664 A GB1246664 A GB 1246664A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mixture
- gypsum
- heating
- calcium sulphate
- temperature
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/032—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the wet process, e.g. dehydrating in solution or under saturated vapour conditions, i.e. to obtain alpha-hemihydrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0018—Evaporation of components of the mixture to be separated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0036—Crystallisation on to a bed of product crystals; Seeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/005—Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J16/00—Chemical processes in general for reacting liquids with non- particulate solids, e.g. sheet material; Apparatus specially adapted therefor
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/466—Conversion of one form of calcium sulfate to another
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Catalysts (AREA)
Abstract
1,246,664. Calcium sulphate hemihydrate. ETABS., POLIET & CHAUSSON. 2 July, 1968 [25 Aug., 1967], No. 31603/68. Heading C1A. Gypsum is heated in suspension in a mixture of water and one or more organic liquids, the mixture having a boiling point above the temperature at which gypsum dissolves in the mixture and at which temperature gypsum is converted to calcium sulphate hemihydrate, the mixture is filtered, and the residue dried by evaporation. The organic liquid may be glycol, one of its homologues, or glycerol or one of its homologues. A soluble salt of potassium, rubidium or caesium, preferably having an organic anion may also be incorporated into the mixture. Seed crystals may be produced by heating at a temperature below that of the final heating, cooling, and bringing to the temperature of the heating. Substantially all of the gypsum is preferably dissolved during the heating step. The mixture is preferably boiled during the heating step.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR119019 | 1967-08-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1246664A true GB1246664A (en) | 1971-09-15 |
Family
ID=8637363
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31603/68A Expired GB1246664A (en) | 1967-08-25 | 1968-07-02 | Method of manufacturing calcium sulphate hemi-hydrate |
Country Status (8)
Country | Link |
---|---|
BE (1) | BE717260A (en) |
CH (1) | CH510583A (en) |
DE (1) | DE1767937C3 (en) |
ES (1) | ES356722A1 (en) |
FR (1) | FR1548410A (en) |
GB (1) | GB1246664A (en) |
LU (1) | LU56676A1 (en) |
NL (1) | NL6812084A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0876996A1 (en) * | 1997-05-10 | 1998-11-11 | SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG | Process for the preparation of calcium sulfate-alpha hemi-hydrate |
CN110498626A (en) * | 2019-09-09 | 2019-11-26 | 太原科技大学 | A kind of production method of alpha semi-hydrated gypsum |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8793897B2 (en) * | 2010-08-11 | 2014-08-05 | Grenzebach Bsh Gmbh | Process and device for stabilising, cooling and dehumidifying gypsum plaster |
-
1967
- 1967-08-25 FR FR119019A patent/FR1548410A/fr not_active Expired
-
1968
- 1968-06-27 BE BE717260D patent/BE717260A/xx not_active IP Right Cessation
- 1968-07-01 CH CH978568A patent/CH510583A/en not_active IP Right Cessation
- 1968-07-02 GB GB31603/68A patent/GB1246664A/en not_active Expired
- 1968-07-03 DE DE1767937A patent/DE1767937C3/en not_active Expired
- 1968-07-31 ES ES356722A patent/ES356722A1/en not_active Expired
- 1968-08-08 LU LU56676D patent/LU56676A1/xx unknown
- 1968-08-23 NL NL6812084A patent/NL6812084A/xx unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0876996A1 (en) * | 1997-05-10 | 1998-11-11 | SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG | Process for the preparation of calcium sulfate-alpha hemi-hydrate |
CN110498626A (en) * | 2019-09-09 | 2019-11-26 | 太原科技大学 | A kind of production method of alpha semi-hydrated gypsum |
CN110498626B (en) * | 2019-09-09 | 2022-04-05 | 太原科技大学 | Production method of alpha-type semi-hydrated gypsum |
Also Published As
Publication number | Publication date |
---|---|
DE1767937B2 (en) | 1973-08-02 |
FR1548410A (en) | 1968-12-06 |
DE1767937A1 (en) | 1972-03-09 |
LU56676A1 (en) | 1968-11-18 |
NL6812084A (en) | 1969-02-27 |
CH510583A (en) | 1971-07-31 |
BE717260A (en) | 1968-12-02 |
DE1767937C3 (en) | 1974-03-07 |
ES356722A1 (en) | 1970-02-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DK123600B (en) | Analogous process for the preparation of 5,11-dihydro-6H-pyrido [2,3-b] [1,4] benzodiazepin-6-ones or acid addition salts thereof substituted in the 11-position. | |
DK138496B (en) | Analogous process for the preparation of imidazoline derivatives or acid addition salts thereof. | |
SE405121B (en) | PROCEDURE FOR THE PREPARATION OF 2- (HETEROARYL-METHYL) -5-9BETA-DIALKYL-6,7-BENZOMORPHANES OR THEIR ACID ADDITIONAL SALTS | |
DK134488B (en) | Analogous process for the preparation of cis-configured benzo / c // 1.6 / naphthyridine derivatives or acid addition salts thereof in positions 4a, 10b. | |
DK120551B (en) | Process for the preparation of benzothiophene derivatives or acid addition salts thereof. | |
GB1246664A (en) | Method of manufacturing calcium sulphate hemi-hydrate | |
ES399609A1 (en) | Preparation of an acidified milk product in powder form | |
DK140545B (en) | Analogous process for the preparation of benzoylphenylbutyric acid derivatives or their salts. | |
BE788399A (en) | PROCESS FOR PREPARATION OF POLYHYDRIC COMPOUNDS | |
DK138641B (en) | Analogous process for the preparation of tricyclic compounds or acid addition salts thereof. | |
DK131778B (en) | Process for the preparation of substituted 3-hydroxymethylisoquinoline derivatives or acid addition salts thereof. | |
DK131857B (en) | Analogous process for the preparation of 4-hydroxymethyl-1-phthalazone derivatives or acid addition salts thereof. | |
DK135231B (en) | Analogous process for the preparation of basic substituted 2,3-cis, trans-diphenylcyclopropane derivatives or acid addition salts thereof. | |
DK130344B (en) | Analogous process for the preparation of benzofuran derivatives or acid addition salts thereof. | |
GB1162514A (en) | Process for the preparation of Phosphoric Acid and Gypsum from Phosphate Rock | |
DK109803C (en) | Process for the preparation of thiepine or oxepine derivatives or acid addition salts thereof. | |
GB1132657A (en) | Process for working up aqueous solutions containing a glycol ether and hexadienic acids | |
DK133503B (en) | Process for the preparation of 4-chloro-5-sulfamoyl-anthranilic acid derivatives or metal or ammonium salts thereof. | |
DK127501B (en) | Analogous process for the preparation of substituted phenoxyethylamines or their acid addition salts. | |
DK120797B (en) | Analogous process for the preparation of 1,3,4,9b-tetrahydro-2,5-dimethyl-2H-indeno [1,2-c] pyridine or acid addition salts thereof. | |
ES334279A1 (en) | A procedure for the recovery of ammonium sulphate from an aqueous solution of ammonium sulfate. (Machine-translation by Google Translate, not legally binding) | |
IE35902B1 (en) | Process for the preparation of a calcium salt solution with improved calcium effect pharmaceutical preparation having improved calcium effect as well as a method for treating calcium deficiency | |
DK137796B (en) | Process for the preparation of 1-aryloxy-3-aminopropanol derivatives or acid addition salts thereof. | |
DK124689B (en) | Analogous process for the preparation of thiepine derivatives or acid addition salts thereof. | |
ES323414A1 (en) | Procedure to prepare tin phosphate and titanium phosphate. (Machine-translation by Google Translate, not legally binding) |