NL172142C - METHOD AND APPARATUS FOR THE PREPARATION OF CALCIUM SULPHATE-ALFA-SEMI-HYDRATE - Google Patents

METHOD AND APPARATUS FOR THE PREPARATION OF CALCIUM SULPHATE-ALFA-SEMI-HYDRATE

Info

Publication number
NL172142C
NL172142C NLAANVRAGE7514656,A NL7514656A NL172142C NL 172142 C NL172142 C NL 172142C NL 7514656 A NL7514656 A NL 7514656A NL 172142 C NL172142 C NL 172142C
Authority
NL
Netherlands
Prior art keywords
alfa
hydrate
semi
preparation
calcium sulphate
Prior art date
Application number
NLAANVRAGE7514656,A
Other languages
Dutch (nl)
Other versions
NL172142B (en
NL7514656A (en
Original Assignee
Hoechst Ag
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
Priority claimed from DE19742459739 external-priority patent/DE2459739C3/en
Application filed by Hoechst Ag filed Critical Hoechst Ag
Publication of NL7514656A publication Critical patent/NL7514656A/en
Publication of NL172142B publication Critical patent/NL172142B/en
Application granted granted Critical
Publication of NL172142C publication Critical patent/NL172142C/en

Links

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)
NLAANVRAGE7514656,A 1974-12-18 1975-12-16 METHOD AND APPARATUS FOR THE PREPARATION OF CALCIUM SULPHATE-ALFA-SEMI-HYDRATE NL172142C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742459739 DE2459739C3 (en) 1974-12-18 Process and plant for the production of calcium sulfate alpha hemihydrate

Publications (3)

Publication Number Publication Date
NL7514656A NL7514656A (en) 1976-06-22
NL172142B NL172142B (en) 1983-02-16
NL172142C true NL172142C (en) 1983-07-18

Family

ID=5933662

Family Applications (1)

Application Number Title Priority Date Filing Date
NLAANVRAGE7514656,A NL172142C (en) 1974-12-18 1975-12-16 METHOD AND APPARATUS FOR THE PREPARATION OF CALCIUM SULPHATE-ALFA-SEMI-HYDRATE

Country Status (14)

Country Link
AT (1) AT340445B (en)
BE (1) BE836714A (en)
BR (1) BR7508349A (en)
CH (1) CH618146A5 (en)
DK (1) DK142026C (en)
FR (1) FR2294985A1 (en)
GB (1) GB1474839A (en)
IE (1) IE42222B1 (en)
LU (1) LU74027A1 (en)
NL (1) NL172142C (en)
PL (1) PL109429B1 (en)
RO (1) RO67270A (en)
SE (1) SE405844B (en)
SU (1) SU805943A3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0085382A1 (en) * 1982-02-01 1983-08-10 Quante, Heinrich Installation for the production of alpha-calcium sulfate
CN111517355A (en) * 2020-05-05 2020-08-11 桂林理工大学 Method for preparing alpha hemihydrate gypsum from phosphogypsum under autoclaved condition

Also Published As

Publication number Publication date
IE42222L (en) 1976-06-18
RO67270A (en) 1980-03-15
FR2294985B1 (en) 1981-08-07
GB1474839A (en) 1977-05-25
DE2459739B2 (en) 1976-11-18
DE2459739A1 (en) 1976-07-01
LU74027A1 (en) 1976-12-31
PL109429B1 (en) 1980-05-31
BR7508349A (en) 1976-09-08
CH618146A5 (en) 1980-07-15
NL172142B (en) 1983-02-16
NL7514656A (en) 1976-06-22
DK574175A (en) 1976-06-19
SE405844B (en) 1979-01-08
AT340445B (en) 1977-12-12
DK142026B (en) 1980-08-11
DK142026C (en) 1981-01-05
BE836714A (en) 1976-06-17
FR2294985A1 (en) 1976-07-16
IE42222B1 (en) 1980-07-02
SU805943A3 (en) 1981-02-15
ATA958575A (en) 1977-04-15
SE7514272L (en) 1976-06-21

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Legal Events

Date Code Title Description
V1 Lapsed because of non-payment of the annual fee