GB1027434A - Improvements in or relating to calcium sulphate hemihydrate production - Google Patents
Improvements in or relating to calcium sulphate hemihydrate productionInfo
- Publication number
- GB1027434A GB1027434A GB802763A GB802763A GB1027434A GB 1027434 A GB1027434 A GB 1027434A GB 802763 A GB802763 A GB 802763A GB 802763 A GB802763 A GB 802763A GB 1027434 A GB1027434 A GB 1027434A
- Authority
- GB
- United Kingdom
- Prior art keywords
- calcium sulphate
- hemihydrate
- water
- salts
- compounds
- 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
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 title abstract 4
- 150000003839 salts Chemical class 0.000 abstract 4
- 150000001875 compounds Chemical class 0.000 abstract 3
- 239000006227 byproduct Substances 0.000 abstract 2
- 238000001354 calcination Methods 0.000 abstract 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 abstract 2
- 235000011007 phosphoric acid Nutrition 0.000 abstract 2
- 150000003016 phosphoric acids Chemical class 0.000 abstract 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 1
- 239000007900 aqueous suspension Substances 0.000 abstract 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract 1
- 239000000920 calcium hydroxide Substances 0.000 abstract 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract 1
- 235000011116 calcium hydroxide Nutrition 0.000 abstract 1
- 239000004568 cement Substances 0.000 abstract 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 abstract 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 235000010755 mineral Nutrition 0.000 abstract 1
- 239000011574 phosphorus Substances 0.000 abstract 1
- 229910052698 phosphorus Inorganic materials 0.000 abstract 1
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Calcium sulphate hemihydrate is prepared by calcining calcium sulphate dihydrate, which is produced in the treatment of phosphorus-containing minerals and contaminated with water-soluble phosphoric acids or water-soluble salts thereof, to form by-product calcium sulphate hemihydrate, and then treating an aqueous suspension of the hemihydrate with compounds which form insoluble salts with the phosphoric acids or their water-soluble salts and then dehydrating the calcium sulphate dihydrate formed to calcium sulphate hemihydrate by means of a second calcination. Suitable compounds which form insuluble salts are hydrated lime, Portland or similar cements, urotropin, iron-III-ions or iron-III-sulphate. The by-product hemihydrate may be mixed with said compounds by means of a granulator plate or in mixing vessel or by means of a powder-moistening apparatus.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEK46118A DE1174672B (en) | 1962-03-09 | 1962-03-09 | Process for the preparation of calcium sulfate dihydrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1027434A true GB1027434A (en) | 1966-04-27 |
Family
ID=7224092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB802763A Expired GB1027434A (en) | 1962-03-09 | 1963-02-28 | Improvements in or relating to calcium sulphate hemihydrate production |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1174672B (en) |
| DK (1) | DK114183B (en) |
| GB (1) | GB1027434A (en) |
| SE (1) | SE300105B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10023496B1 (en) * | 2017-06-16 | 2018-07-17 | United States Gypsum Company | No fiber calcination of gypsum for gypsum fiberboard |
| CN114409285A (en) * | 2022-01-05 | 2022-04-29 | 北新集团建材股份有限公司 | Gypsum raw material pretreatment method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1713868A (en) * | 1928-07-18 | 1929-05-21 | Rumford Chemical Works | Process of treating acidulous by-product calcium sulphate |
-
1962
- 1962-03-09 DE DEK46118A patent/DE1174672B/en active Pending
-
1963
- 1963-02-28 GB GB802763A patent/GB1027434A/en not_active Expired
- 1963-03-02 DK DK96963A patent/DK114183B/en unknown
- 1963-03-05 SE SE240663A patent/SE300105B/xx unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10023496B1 (en) * | 2017-06-16 | 2018-07-17 | United States Gypsum Company | No fiber calcination of gypsum for gypsum fiberboard |
| CN114409285A (en) * | 2022-01-05 | 2022-04-29 | 北新集团建材股份有限公司 | Gypsum raw material pretreatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| SE300105B (en) | 1968-04-08 |
| DK114183B (en) | 1969-06-02 |
| DE1174672B (en) | 1964-07-23 |
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