CH618146A5 - Process and plant for preparing calcium sulphate alpha -semihydrate. - Google Patents
Process and plant for preparing calcium sulphate alpha -semihydrate. Download PDFInfo
- Publication number
- CH618146A5 CH618146A5 CH1615975A CH1615975A CH618146A5 CH 618146 A5 CH618146 A5 CH 618146A5 CH 1615975 A CH1615975 A CH 1615975A CH 1615975 A CH1615975 A CH 1615975A CH 618146 A5 CH618146 A5 CH 618146A5
- Authority
- CH
- Switzerland
- Prior art keywords
- autoclave
- calcium sulfate
- cold water
- hemihydrate
- suspension
- Prior art date
Links
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title claims description 32
- 238000000034 method Methods 0.000 title claims description 16
- 235000011132 calcium sulphate Nutrition 0.000 title 1
- 239000001175 calcium sulphate Substances 0.000 title 1
- 239000000725 suspension Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 10
- 229910052791 calcium Inorganic materials 0.000 claims description 10
- 239000011575 calcium Substances 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 239000007900 aqueous suspension Substances 0.000 claims description 3
- 238000001311 chemical methods and process Methods 0.000 claims description 3
- 230000029087 digestion Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 5
- 229910052602 gypsum Inorganic materials 0.000 description 5
- 239000012452 mother liquor Substances 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 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
- 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
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)
- Removal Of Specific Substances (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742459739 DE2459739C3 (de) | 1974-12-18 | Verfahren und Anlage zur Herstellung von Calciumsulfat-alpha-Halbhydrat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH618146A5 true CH618146A5 (en) | 1980-07-15 |
Family
ID=5933662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH1615975A CH618146A5 (en) | 1974-12-18 | 1975-12-12 | Process and plant for preparing calcium sulphate alpha -semihydrate. |
Country Status (14)
| Country | Link |
|---|---|
| AT (1) | AT340445B (fr) |
| BE (1) | BE836714A (fr) |
| BR (1) | BR7508349A (fr) |
| CH (1) | CH618146A5 (fr) |
| DK (1) | DK142026C (fr) |
| FR (1) | FR2294985A1 (fr) |
| GB (1) | GB1474839A (fr) |
| IE (1) | IE42222B1 (fr) |
| LU (1) | LU74027A1 (fr) |
| NL (1) | NL172142C (fr) |
| PL (1) | PL109429B1 (fr) |
| RO (1) | RO67270A (fr) |
| SE (1) | SE405844B (fr) |
| SU (1) | SU805943A3 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0085382A1 (fr) * | 1982-02-01 | 1983-08-10 | Quante, Heinrich | Installation pour la préparation de alpha-sulfate de calcium demihydrate |
| CN111517355A (zh) * | 2020-05-05 | 2020-08-11 | 桂林理工大学 | 一种蒸压条件下磷石膏制备α半水石膏的方法 |
-
1975
- 1975-12-03 GB GB4965175A patent/GB1474839A/en not_active Expired
- 1975-12-12 CH CH1615975A patent/CH618146A5/de not_active IP Right Cessation
- 1975-12-12 RO RO7584191A patent/RO67270A/fr unknown
- 1975-12-15 SU SU752199179A patent/SU805943A3/ru active
- 1975-12-16 LU LU74027A patent/LU74027A1/xx unknown
- 1975-12-16 NL NLAANVRAGE7514656,A patent/NL172142C/xx not_active IP Right Cessation
- 1975-12-17 SE SE7514272A patent/SE405844B/xx unknown
- 1975-12-17 PL PL1975185660A patent/PL109429B1/pl unknown
- 1975-12-17 IE IE2746/75A patent/IE42222B1/en unknown
- 1975-12-17 AT AT958575A patent/AT340445B/de not_active IP Right Cessation
- 1975-12-17 BR BR7508349*A patent/BR7508349A/pt unknown
- 1975-12-17 DK DK574175A patent/DK142026C/da active
- 1975-12-17 BE BE162803A patent/BE836714A/fr not_active IP Right Cessation
- 1975-12-18 FR FR7538905A patent/FR2294985A1/fr active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| GB1474839A (en) | 1977-05-25 |
| PL109429B1 (en) | 1980-05-31 |
| ATA958575A (de) | 1977-04-15 |
| SU805943A3 (ru) | 1981-02-15 |
| NL172142C (nl) | 1983-07-18 |
| DK574175A (da) | 1976-06-19 |
| NL172142B (nl) | 1983-02-16 |
| SE405844B (sv) | 1979-01-08 |
| BE836714A (fr) | 1976-06-17 |
| BR7508349A (pt) | 1976-09-08 |
| DE2459739B2 (de) | 1976-11-18 |
| DK142026B (da) | 1980-08-11 |
| SE7514272L (sv) | 1976-06-21 |
| DK142026C (da) | 1981-01-05 |
| IE42222B1 (en) | 1980-07-02 |
| FR2294985A1 (fr) | 1976-07-16 |
| DE2459739A1 (de) | 1976-07-01 |
| NL7514656A (nl) | 1976-06-22 |
| IE42222L (en) | 1976-06-18 |
| RO67270A (fr) | 1980-03-15 |
| AT340445B (de) | 1977-12-12 |
| LU74027A1 (fr) | 1976-12-31 |
| FR2294985B1 (fr) | 1981-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PL | Patent ceased | ||
| PL | Patent ceased |