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DE3780079D1 - Verfahren zur herstellung von fast cadmiumfreiem calciumsulfat und nach diesem verfahren erhaltenes calciumsulfat. - Google Patents

Verfahren zur herstellung von fast cadmiumfreiem calciumsulfat und nach diesem verfahren erhaltenes calciumsulfat.

Info

Publication number
DE3780079D1
DE3780079D1 DE8787200767T DE3780079T DE3780079D1 DE 3780079 D1 DE3780079 D1 DE 3780079D1 DE 8787200767 T DE8787200767 T DE 8787200767T DE 3780079 T DE3780079 T DE 3780079T DE 3780079 D1 DE3780079 D1 DE 3780079D1
Authority
DE
Germany
Prior art keywords
calcium sulfate
cadmium
producing
sulphate
free
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 - Lifetime
Application number
DE8787200767T
Other languages
English (en)
Other versions
DE3780079T2 (de
Inventor
Ruud Spijker
Tjay Tjien Tjioe
Geert Jan Witkamp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke DSM NV
Original Assignee
DSM NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DSM NV filed Critical DSM NV
Publication of DE3780079D1 publication Critical patent/DE3780079D1/de
Application granted granted Critical
Publication of DE3780079T2 publication Critical patent/DE3780079T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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)
  • Luminescent Compositions (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Pyrrole Compounds (AREA)
DE8787200767T 1986-04-29 1987-04-23 Verfahren zur herstellung von fast cadmiumfreiem calciumsulfat und nach diesem verfahren erhaltenes calciumsulfat. Expired - Fee Related DE3780079T2 (de)

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 (2)

Publication Number Publication Date
DE3780079D1 true DE3780079D1 (de) 1992-08-06
DE3780079T2 DE3780079T2 (de) 1993-02-18

Family

ID=19847956

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8787200767T Expired - Fee Related DE3780079T2 (de) 1986-04-29 1987-04-23 Verfahren zur herstellung von fast cadmiumfreiem calciumsulfat und nach diesem verfahren erhaltenes calciumsulfat.

Country Status (12)

Country Link
EP (1) EP0245897B1 (de)
AT (1) ATE77805T1 (de)
CA (1) CA1320034C (de)
DE (1) DE3780079T2 (de)
ES (1) ES2033801T3 (de)
FI (1) FI80252C (de)
GR (1) GR3005822T3 (de)
IL (1) IL82359A0 (de)
IN (1) IN169407B (de)
MA (1) MA20960A1 (de)
NL (1) NL8601100A (de)
ZA (1) ZA873036B (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
IL82359A0 (en) 1987-10-30
CA1320034C (en) 1993-07-13
IN169407B (de) 1991-10-12
NL8601100A (nl) 1987-11-16
FI80252C (fi) 1990-05-10
ES2033801T3 (es) 1993-04-01
EP0245897B1 (de) 1992-07-01
FI871866L (fi) 1987-10-30
GR3005822T3 (de) 1993-06-07
MA20960A1 (fr) 1987-12-31
FI871866A0 (fi) 1987-04-28
EP0245897A1 (de) 1987-11-19
ATE77805T1 (de) 1992-07-15
FI80252B (fi) 1990-01-31
ZA873036B (en) 1987-10-21
DE3780079T2 (de) 1993-02-18

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee