ZA738038B - Washing of calcium sulphate hemihydrate crystals - Google Patents
Washing of calcium sulphate hemihydrate crystalsInfo
- Publication number
- ZA738038B ZA738038B ZA00738038A ZA738038A ZA738038B ZA 738038 B ZA738038 B ZA 738038B ZA 00738038 A ZA00738038 A ZA 00738038A ZA 738038 A ZA738038 A ZA 738038A ZA 738038 B ZA738038 B ZA 738038B
- Authority
- ZA
- South Africa
- Prior art keywords
- washing
- calcium sulphate
- sulphate hemihydrate
- hemihydrate crystals
- crystals
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
- C23F15/005—Inhibiting incrustation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/02—Solvent extraction of solids
- B01D11/0288—Applications, solvents
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
- C01B25/223—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen only one form of calcium sulfate being formed
- C01B25/2235—Anhydrite processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
- C01B25/223—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen only one form of calcium sulfate being formed
- C01B25/226—Hemihydrate process
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Metallurgy (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Detergent Compositions (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5145472A GB1451608A (en) | 1972-11-08 | 1972-11-08 | Process for reducing calcium sulphate scale formation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA738038B true ZA738038B (en) | 1975-03-26 |
Family
ID=10460097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA00738038A ZA738038B (en) | 1972-11-08 | 1973-10-16 | Washing of calcium sulphate hemihydrate crystals |
Country Status (22)
| Country | Link |
|---|---|
| US (1) | US3972981A (xx) |
| JP (2) | JPS594379B2 (xx) |
| AT (1) | AT363910B (xx) |
| BE (1) | BE806533A (xx) |
| BR (1) | BR7308671D0 (xx) |
| CA (1) | CA1032731A (xx) |
| CS (1) | CS200462B2 (xx) |
| DD (1) | DD111883A5 (xx) |
| DE (1) | DE2355607A1 (xx) |
| ES (1) | ES420313A1 (xx) |
| FR (1) | FR2205479B1 (xx) |
| GB (1) | GB1451608A (xx) |
| HU (1) | HU168213B (xx) |
| IN (1) | IN141012B (xx) |
| IT (1) | IT1012092B (xx) |
| NL (1) | NL7314813A (xx) |
| OA (1) | OA04514A (xx) |
| PL (1) | PL102163B1 (xx) |
| RO (1) | RO63885A (xx) |
| SE (2) | SE389092B (xx) |
| SU (1) | SU695549A3 (xx) |
| ZA (1) | ZA738038B (xx) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4049774A (en) * | 1970-11-12 | 1977-09-20 | Fisons Limited | Process for reducing formation of gypsum scale durng the washing of calcium sulphate hemihydrate crystals |
| US4221769A (en) * | 1972-11-08 | 1980-09-09 | Fisons Limited | Process for preventing the formation of calcium sulphate scale |
| DE2427122B2 (de) * | 1974-06-05 | 1976-12-30 | Gebr. Knauf Westdeutsche Gipswerke, 8715 Iphofen | Verfahren zur stabilisierung des bei der herstellung nasser phosphorsaeure anfallenden alpha-calciumsulfat-halbhydrat |
| US4332779A (en) * | 1980-11-24 | 1982-06-01 | American Cyanamid Company | Phosphoric acid filtration process |
| JPS63144107A (ja) * | 1986-12-08 | 1988-06-16 | Mitsui Toatsu Chem Inc | 高濃度燐酸−半水石こうスラリ−の濾過方法 |
| US20090294373A1 (en) * | 2008-05-30 | 2009-12-03 | Gill Jasbir S | Inhibition of water formed scale in acid conditions |
| US20090294372A1 (en) * | 2008-05-30 | 2009-12-03 | Gill Jasbir S | Inhibition of water formed scale in acid conditions |
| US9242863B2 (en) * | 2009-09-25 | 2016-01-26 | Cytec Technology Corp. | Process and reagents for the inhibition or reduction of scale formation during phosphoric acid production |
| CN102712476B (zh) * | 2009-09-25 | 2019-03-12 | 塞特克技术公司 | 防止或减少湿法制备磷酸中结垢 |
| AP3575A (en) * | 2009-09-25 | 2016-02-08 | Cytec Tech Corp | Process and reagents for the inhibition or reduction of scale formation during phosphoric acid production |
| US8900539B2 (en) | 2011-03-22 | 2014-12-02 | Cytec Technology Corp. | Preventing or reducing scale in wet-process phosphoric acid production |
| BR112016017702B1 (pt) | 2014-02-11 | 2022-01-25 | Cytec Industries Inc. | Processo de inibição de incrustações produzidas durante a produção de ácido fosfórico de processo por via úmida |
| CA2976357C (en) | 2015-02-11 | 2021-11-09 | Cytec Industries Inc. | Modified amines useful as scale inhibitors in wet process phosphoric acid production |
| US10759662B2 (en) | 2018-03-12 | 2020-09-01 | Solenis Technologies, L.P. | Systems and methods for reducing formation of scale in phosphoric acid production |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2448218A (en) * | 1942-12-17 | 1948-08-31 | British Plaster Board Ltd | Manufacture of plaster of paris |
| US2968528A (en) * | 1957-07-01 | 1961-01-17 | Int Minerals & Chem Corp | Process for producing clarified phosphoric acid |
| GB1011163A (en) * | 1961-04-26 | 1965-11-24 | Dorr Oliver Inc | Manufacture of phosphoric acid |
| US3238142A (en) * | 1963-10-16 | 1966-03-01 | American Cyanamid Co | Antifoaming composition |
| GB1113922A (en) * | 1964-08-19 | 1968-05-15 | Fisons Ltd | Clarifying phosphoric acid |
| DE1238374B (de) * | 1965-04-24 | 1967-04-06 | Giulini Ges Mit Beschraenkter | Verfahren zur Herstellung von alpha-Calciumsulfat-Halbhydrat |
| US3397956A (en) * | 1966-07-28 | 1968-08-20 | Nalco Chemical Co | Process for manufacturing phosphoric acid |
| US3594123A (en) * | 1967-08-10 | 1971-07-20 | Arizona Chem | Enhancement of gypsum crystal growth in wet-process phosphoric acid |
| US3598755A (en) * | 1968-07-05 | 1971-08-10 | Continental Oil Co | Foam control agents |
| CA880214A (en) * | 1968-07-10 | 1971-09-07 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of National Defence Of Her Majesty's Canadian Government | Recovering phosphoric acid |
| US3645677A (en) * | 1968-09-24 | 1972-02-29 | Taki Fertilizer Mfg Co Ltd | Production of gypsum |
| US3554694A (en) * | 1969-06-02 | 1971-01-12 | Cities Service Co | Process for producing fluosilicates |
| DE2035505C3 (de) * | 1970-07-17 | 1974-06-12 | Knapsack Ag, 5033 Huerth-Knapsack | Verfahren zur Herstellung reiner Alkaliphosphatlösungen |
| US3714330A (en) * | 1970-08-14 | 1973-01-30 | Cities Service Co | Treatment of phosphoric acid to recover alkali metal fluosilicates |
| US3796790A (en) * | 1972-04-25 | 1974-03-12 | Canadian Patents Dev | Process for recovering concentrated phosphoric acid |
-
1972
- 1972-11-08 GB GB5145472A patent/GB1451608A/en not_active Expired
-
1973
- 1973-10-16 ZA ZA00738038A patent/ZA738038B/xx unknown
- 1973-10-25 US US05/409,366 patent/US3972981A/en not_active Expired - Lifetime
- 1973-10-25 BE BE137083A patent/BE806533A/xx not_active IP Right Cessation
- 1973-10-29 AT AT0911973A patent/AT363910B/de not_active IP Right Cessation
- 1973-10-29 NL NL7314813A patent/NL7314813A/xx not_active Application Discontinuation
- 1973-10-30 CA CA184,624A patent/CA1032731A/en not_active Expired
- 1973-11-02 IN IN2421/CAL/1973A patent/IN141012B/en unknown
- 1973-11-06 RO RO7376545A patent/RO63885A/ro unknown
- 1973-11-06 DD DD174483A patent/DD111883A5/xx unknown
- 1973-11-06 HU HUFI549A patent/HU168213B/hu unknown
- 1973-11-06 SU SU731967924A patent/SU695549A3/ru active
- 1973-11-07 PL PL1973166379A patent/PL102163B1/pl unknown
- 1973-11-07 ES ES420313A patent/ES420313A1/es not_active Expired
- 1973-11-07 BR BR8671/73A patent/BR7308671D0/pt unknown
- 1973-11-07 FR FR7339491A patent/FR2205479B1/fr not_active Expired
- 1973-11-07 DE DE19732355607 patent/DE2355607A1/de not_active Withdrawn
- 1973-11-07 SE SE7315123A patent/SE389092B/xx unknown
- 1973-11-08 CS CS737666A patent/CS200462B2/cs unknown
- 1973-11-08 IT IT7331058A patent/IT1012092B/it active
- 1973-11-08 JP JP48125040A patent/JPS594379B2/ja not_active Expired
- 1973-11-28 OA OA55072A patent/OA04514A/xx unknown
-
1976
- 1976-01-09 SE SE7600174A patent/SE414164B/xx unknown
-
1983
- 1983-09-27 JP JP58177201A patent/JPS59152211A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DD111883A5 (xx) | 1975-03-12 |
| FR2205479A1 (xx) | 1974-05-31 |
| AU6203673A (en) | 1975-05-01 |
| CS200462B2 (en) | 1980-09-15 |
| DE2355607A1 (de) | 1974-05-16 |
| SE7600174L (sv) | 1976-01-09 |
| CA1032731A (en) | 1978-06-13 |
| GB1451608A (en) | 1976-10-06 |
| FR2205479B1 (xx) | 1976-11-19 |
| US3972981A (en) | 1976-08-03 |
| IN141012B (xx) | 1977-01-08 |
| AT363910B (de) | 1981-09-10 |
| JPS594379B2 (ja) | 1984-01-30 |
| BR7308671D0 (pt) | 1974-08-22 |
| SE414164B (sv) | 1980-07-14 |
| OA04514A (fr) | 1980-03-30 |
| HU168213B (xx) | 1976-03-28 |
| IT1012092B (it) | 1977-03-10 |
| SU695549A3 (ru) | 1979-10-30 |
| NL7314813A (xx) | 1974-05-10 |
| JPS59152211A (ja) | 1984-08-30 |
| RO63885A (fr) | 1979-02-15 |
| JPS49134590A (xx) | 1974-12-25 |
| PL102163B1 (pl) | 1979-03-31 |
| ES420313A1 (es) | 1976-03-16 |
| ATA911973A (de) | 1981-02-15 |
| SE389092B (sv) | 1976-10-25 |
| BE806533A (fr) | 1974-04-25 |
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