GB858469A - Improvements in or relating to the bonding of gypsum to paper and products obtained thereby - Google Patents
Improvements in or relating to the bonding of gypsum to paper and products obtained therebyInfo
- Publication number
- GB858469A GB858469A GB37475/58A GB3747558A GB858469A GB 858469 A GB858469 A GB 858469A GB 37475/58 A GB37475/58 A GB 37475/58A GB 3747558 A GB3747558 A GB 3747558A GB 858469 A GB858469 A GB 858469A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gypsum
- ammonia
- calcined
- relating
- bonding
- 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
- 239000010440 gypsum Substances 0.000 title abstract 6
- 229910052602 gypsum Inorganic materials 0.000 title abstract 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 6
- 229910021529 ammonia Inorganic materials 0.000 abstract 3
- 239000002253 acid Substances 0.000 abstract 2
- 239000006227 byproduct Substances 0.000 abstract 2
- 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 abstract 2
- 239000012535 impurity Substances 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical class F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 1
- 150000007513 acids Chemical class 0.000 abstract 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract 1
- 238000005119 centrifugation Methods 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 239000011507 gypsum plaster Substances 0.000 abstract 1
- 239000002367 phosphate rock Substances 0.000 abstract 1
- 239000002002 slurry Substances 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
-
- 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
- C04B11/024—Ingredients added before, or during, the calcining process, e.g. calcination modifiers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
In producing calcined gypsum, i.e. a form of plaster of Paris, from by-product gypsum obtained by the action of sulphuric acid on phosphate rock and containing, as impurities, phosphoric, sulphuric and hydrofluoric acids, these acids are neutralized by treatment with ammonia. The by-product gypsum is, preferably, slurried in water and sufficient ammonia is added to bring the pH value of the slurry to between 8 and 10. Water is then removed by filtration, centrifugation or evaporation to leave a cake, which is calcined at a temperature between 250 and 400 DEG F. to convert the gypsum into calcium sulphate hemihydrate. Any residual acid impurities in the calcined gypsum may be neutralized by treating it with ammonia.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US858469XA | 1957-11-25 | 1957-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB858469A true GB858469A (en) | 1961-01-11 |
Family
ID=22194342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37475/58A Expired GB858469A (en) | 1957-11-25 | 1958-11-21 | Improvements in or relating to the bonding of gypsum to paper and products obtained thereby |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB858469A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2162465A (en) * | 1982-08-16 | 1986-02-05 | Armstrong World Ind Inc | Building board |
| CN114031319A (en) * | 2021-12-07 | 2022-02-11 | 新希望化工投资有限公司 | Method for producing building gypsum powder from phosphogypsum |
-
1958
- 1958-11-21 GB GB37475/58A patent/GB858469A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2162465A (en) * | 1982-08-16 | 1986-02-05 | Armstrong World Ind Inc | Building board |
| CN114031319A (en) * | 2021-12-07 | 2022-02-11 | 新希望化工投资有限公司 | Method for producing building gypsum powder from phosphogypsum |
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