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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Glass Compositions (AREA)

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

Similar Documents

Publication Publication Date Title
BE882854A (en) CRYSTALLIZATION PROCESS FOR PARTICULARLY SEPARATING GASES
FR2447975B1 (en) PROCESS FOR PRODUCING NON-VAPORABLE ADSORBENT TERNARY ALLOYS
FR2323635A1 (en) PROCESS FOR PREPARING CONCENTRATED SOLUTIONS OF HYDRAZINE HYDRATE
ES466113A1 (en) Process for the production and the use of whiskers of calcium sulphat
CH423747A (en) Process for the continuous crystallization of adipic acid from its solutions
JPS51141793A (en) Method of forming calcium sulfate whisker
BE833390A (en) PROCESS FOR THERMAL TREATMENT OF SLUDGE, IN PARTICULAR SLUDGE OF MAGNESIAN HYDRATE SLUDGE
JPS5416398A (en) Production of low soda alumina
BE850644A (en) PROCESS FOR THE PREPARATION OF TIN (II) SULPHATE AND PRODUCT THUS OBTAINED
FR2322096A1 (en) PROCESS FOR REMOVING THE AMMONIA COMBINED FROM AQUEOUS CONDENSATES AND RESIDUAL WATER FROM LOW TEMPERATURE PYROGENATION AND COKEFACTION
Barclay et al. New sources of alumina
ES435863A1 (en) Method of preparing magnesium oxide
ES445058A1 (en) Procedure for the manufacture of fertilizers from waste liquors in an acid treatment of aluminum production. (Machine-translation by Google Translate, not legally binding)
YU234280A (en) Process for obtaining 4-amino-5-chloro-1-phenyl-pyridazone(6)
GR63215B (en) Process for the crystallisation of aluminium sulphate solutions at granules free of dust with uniform granule size
KR830007504A (en) Method for preparing 3,3'-dichloro-4,4'-diamino-biphenyl-dihydrochloride
ES479148A1 (en) Procedure for obtaining alumina from solutions containing aluminum sulfate. (Machine-translation by Google Translate, not legally binding)
GB1261616A (en) Production of a crystalline zeolite having reduced alumina content
JPS5223588A (en) Process for producing titanium dioxide carrier
GB547155A (en) Improvements in purification of gases
Ki et al. Study of Desulfurization of Synthetic Potassium Alunite
Ienciu et al. Experimental Research on Silicon Dioxide Solubility in Sodium Aluminate Solutions
BR7703124A (en) PROCESS FOR THE MANUFACTURE OF TRIPLE LEATHER TREATED IN THE LIMESTON WITH SULPHIDE IN ACID TREATMENT BATHS AND COMPOSITION OF DECALIFICATION, PURGE OR PRE-CURTICATION
Videnov et al. Study of the Conditions for Heat Treatment of Alunite From the Surnitsa Village Region
JPS51129890A (en) Process for producing rough gypsum crystals in exhaust gas desulfuriza tion with use of a solution of basic aluminium sulfate