ES466113A1 - Process for the production and the use of whiskers of calcium sulphat - Google Patents

Process for the production and the use of whiskers of calcium sulphat

Info

Publication number
ES466113A1
ES466113A1 ES466113A ES466113A ES466113A1 ES 466113 A1 ES466113 A1 ES 466113A1 ES 466113 A ES466113 A ES 466113A ES 466113 A ES466113 A ES 466113A ES 466113 A1 ES466113 A1 ES 466113A1
Authority
ES
Spain
Prior art keywords
filaments
germs
calcium
temperature
sulphat
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
Application number
ES466113A
Other languages
Spanish (es)
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.)
Bayer AG
Original Assignee
Bayer 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 DE19772702098 external-priority patent/DE2702098A1/en
Priority claimed from DE19772702101 external-priority patent/DE2702101A1/en
Application filed by Bayer AG filed Critical Bayer AG
Publication of ES466113A1 publication Critical patent/ES466113A1/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
    • 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
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
    • C30B29/62—Whiskers or needles

Abstract

Process for obtaining calcium sulphate or calcium sulphate hydrate filaments having a ratio between average length and diameter of at least 6: 1, by crystallization and subsequent separation of the filaments, characterized in that aqueous solutions, acidic, hot, containing calcium sulfate, are freed from glass germs, then cooled to a temperature between 65 to 40º c, kept at this temperature, if necessary under addition of germs, until reaching the saturation concentration, then the solutions continue to cool, and the crystallized filaments separate. (Machine-translation by Google Translate, not legally binding)
ES466113A 1977-01-19 1978-01-18 Process for the production and the use of whiskers of calcium sulphat Expired ES466113A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19772702098 DE2702098A1 (en) 1977-01-19 1977-01-19 Calcium sulphate whisker for reinforcing materials or mouldings - obtd. by cooling an acid soln. to crystallise the whiskers
DE19772702101 DE2702101A1 (en) 1977-01-19 1977-01-19 Calcium sulphate whiskers used as fillers - esp. in paper to reduce cost and increase strength and combustion resistance

Publications (1)

Publication Number Publication Date
ES466113A1 true ES466113A1 (en) 1978-10-01

Family

ID=25771486

Family Applications (1)

Application Number Title Priority Date Filing Date
ES466113A Expired ES466113A1 (en) 1977-01-19 1978-01-18 Process for the production and the use of whiskers of calcium sulphat

Country Status (6)

Country Link
ES (1) ES466113A1 (en)
FI (1) FI780146A (en)
FR (1) FR2377970A1 (en)
GB (1) GB1573883A (en)
NL (1) NL7800544A (en)
SE (1) SE7800589L (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102383179B (en) * 2011-10-09 2015-09-09 昆明理工大学 A kind of method that industrial waste acid and phosphogypsum fully utilize
CN102776569A (en) * 2012-07-09 2012-11-14 泰山医学院 Method for preparing calcium sulfate crystal whiskers by using natural gypsum
CN103014869B (en) * 2012-12-28 2015-07-22 清华大学 Controllable preparation method of ultrathin anhydrous calcium sulfate crystal whisker with high length-diameter ratio
CN104328480B (en) * 2013-09-11 2015-08-05 江西峰竺新材料科技有限公司 A kind of calcium sulphate crystal whisker preparation method
CN110934323A (en) * 2020-01-07 2020-03-31 湖北中烟工业有限责任公司 Method for preparing tobacco sheets by compounding gypsum whiskers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1038025A (en) * 1963-08-16 1966-08-03 Bpb Industries Ltd Lightweight material and production thereof

Also Published As

Publication number Publication date
SE7800589L (en) 1978-07-20
NL7800544A (en) 1978-07-21
FR2377970A1 (en) 1978-08-18
GB1573883A (en) 1980-08-28
FI780146A (en) 1978-07-20

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