ZA873036B - Process of preparing virtually cadmium-free calcium sulphate and calcium sulphate prepared according to this process - Google Patents
Process of preparing virtually cadmium-free calcium sulphate and calcium sulphate prepared according to this processInfo
- Publication number
- ZA873036B ZA873036B ZA873036A ZA873036A ZA873036B ZA 873036 B ZA873036 B ZA 873036B ZA 873036 A ZA873036 A ZA 873036A ZA 873036 A ZA873036 A ZA 873036A ZA 873036 B ZA873036 B ZA 873036B
- Authority
- ZA
- South Africa
- Prior art keywords
- calcium sulphate
- cadmium
- prepared according
- virtually
- free
- Prior art date
Links
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title abstract 10
- 235000011132 calcium sulphate Nutrition 0.000 title abstract 5
- 239000001175 calcium sulphate Substances 0.000 title abstract 5
- 238000000034 method Methods 0.000 title abstract 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract 2
- 239000007788 liquid Substances 0.000 abstract 2
- 239000002367 phosphate rock Substances 0.000 abstract 2
- 238000001556 precipitation Methods 0.000 abstract 2
- -1 sulphate ions Chemical class 0.000 abstract 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 229910052793 cadmium Inorganic materials 0.000 abstract 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 230000029087 digestion Effects 0.000 abstract 1
- 229910052736 halogen Inorganic materials 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 1
Classifications
-
- 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
- C01B25/2208—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with an acid or a mixture of acids other than sulfuric acid
- C01B25/2216—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with an acid or a mixture of acids other than sulfuric acid with nitric acid or nitrous vapours in aqueous medium
-
- 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
-
- 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
-
- 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
- C01B25/228—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 one form of calcium sulfate being formed and then converted to another form
- C01B25/229—Hemihydrate-dihydrate 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
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/237—Selective elimination of impurities
- C01B25/238—Cationic impurities, e.g. arsenic compounds
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Removal Of Specific Substances (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
- Pyrrole Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Luminescent Compositions (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8601100A NL8601100A (nl) | 1986-04-29 | 1986-04-29 | Werkwijze voor het bereiden van nagenoeg cadmiumvrij calciumsulfaat en calciumsulfaat bereid volgens deze werkwijze. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA873036B true ZA873036B (en) | 1987-10-21 |
Family
ID=19847956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA873036A ZA873036B (en) | 1986-04-29 | 1987-04-28 | Process of preparing virtually cadmium-free calcium sulphate and calcium sulphate prepared according to this process |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP0245897B1 (en]) |
| AT (1) | ATE77805T1 (en]) |
| CA (1) | CA1320034C (en]) |
| DE (1) | DE3780079T2 (en]) |
| ES (1) | ES2033801T3 (en]) |
| FI (1) | FI80252C (en]) |
| GR (1) | GR3005822T3 (en]) |
| IL (1) | IL82359A0 (en]) |
| IN (1) | IN169407B (en]) |
| MA (1) | MA20960A1 (en]) |
| NL (1) | NL8601100A (en]) |
| ZA (1) | ZA873036B (en]) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1127581A (en) * | 1978-02-06 | 1982-07-13 | David B. Bartholic | Preparation of fcc charge from residual fractions |
| DE3342211A1 (de) * | 1983-11-23 | 1985-05-30 | Chemische Fabrik Budenheim Rudolf A. Oetker, 6501 Budenheim | Verfahren zur extraktion von cadmium aus sauren loesungen |
-
1986
- 1986-04-29 NL NL8601100A patent/NL8601100A/nl not_active Application Discontinuation
-
1987
- 1987-04-23 EP EP87200767A patent/EP0245897B1/en not_active Expired - Lifetime
- 1987-04-23 DE DE8787200767T patent/DE3780079T2/de not_active Expired - Fee Related
- 1987-04-23 ES ES198787200767T patent/ES2033801T3/es not_active Expired - Lifetime
- 1987-04-23 AT AT87200767T patent/ATE77805T1/de not_active IP Right Cessation
- 1987-04-27 CA CA000535644A patent/CA1320034C/en not_active Expired - Fee Related
- 1987-04-27 IN IN302/MAS/87A patent/IN169407B/en unknown
- 1987-04-27 MA MA21198A patent/MA20960A1/fr unknown
- 1987-04-28 FI FI871866A patent/FI80252C/fi not_active IP Right Cessation
- 1987-04-28 IL IL82359A patent/IL82359A0/xx not_active IP Right Cessation
- 1987-04-28 ZA ZA873036A patent/ZA873036B/xx unknown
-
1992
- 1992-09-30 GR GR920402153T patent/GR3005822T3/el unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI80252B (fi) | 1990-01-31 |
| IL82359A0 (en) | 1987-10-30 |
| EP0245897A1 (en) | 1987-11-19 |
| MA20960A1 (fr) | 1987-12-31 |
| FI871866A0 (fi) | 1987-04-28 |
| EP0245897B1 (en) | 1992-07-01 |
| GR3005822T3 (en]) | 1993-06-07 |
| DE3780079D1 (de) | 1992-08-06 |
| DE3780079T2 (de) | 1993-02-18 |
| NL8601100A (nl) | 1987-11-16 |
| IN169407B (en]) | 1991-10-12 |
| CA1320034C (en) | 1993-07-13 |
| FI871866L (fi) | 1987-10-30 |
| ES2033801T3 (es) | 1993-04-01 |
| FI80252C (fi) | 1990-05-10 |
| ATE77805T1 (de) | 1992-07-15 |
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