GB860896A - Improvements in or relating to alumina - Google Patents

Improvements in or relating to alumina

Info

Publication number
GB860896A
GB860896A GB26294/57A GB2629457A GB860896A GB 860896 A GB860896 A GB 860896A GB 26294/57 A GB26294/57 A GB 26294/57A GB 2629457 A GB2629457 A GB 2629457A GB 860896 A GB860896 A GB 860896A
Authority
GB
United Kingdom
Prior art keywords
alumina
amalgamated
holes
particle size
water vapour
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
GB26294/57A
Inventor
Istvan Csordas
Bela Lanyi
Zoltan Veres
Laszlo Visy
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.)
Kabel Es Muanyaggyar
Original Assignee
Kabel Es Muanyaggyar
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 to DEK32490A priority Critical patent/DE1084705B/en
Priority to NL219312A priority patent/NL106208C/xx
Priority to FR1180103D priority patent/FR1180103A/en
Priority to BE559643D priority patent/BE559643A/xx
Priority to CH360980D priority patent/CH360980A/en
Application filed by Kabel Es Muanyaggyar filed Critical Kabel Es Muanyaggyar
Priority to GB26294/57A priority patent/GB860896A/en
Priority to US689497A priority patent/US2982614A/en
Publication of GB860896A publication Critical patent/GB860896A/en
Expired legal-status Critical Current

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
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/42—Preparation of aluminium oxide or hydroxide from metallic aluminium, e.g. by oxidation
    • C01F7/428—Preparation of aluminium oxide or hydroxide from metallic aluminium, e.g. by oxidation by oxidation in an aqueous solution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

a -Alumina is prepared by exposing amalgamated aluminium to oxygen and water vapour, removing the hydrated alumina formed, dehydrating by heating to form g -alumina, and converting the g -alumina to a -alumina by further heating, preferably in an oxidizing atmosphere. The formation of g -alumina is preferably effected at 1000 DEG to 1100 DEG C., and the conversion to a -alumina at 1400 DEG to 1600 DEG C. To remove coarse particles, the g -alumina may be sieved or subjected to aeroflotation. The aluminium body may be amalgamated by contacting with a mercuric salt solution, for example the chloride or cyanide, after which the body is rinsed and dried. The amalgamated body may then be contacted with a stream of air containing water vapour, preferably at a temperature of 25 DEG to 75 DEG C.-The body may be in the form of a block through which holes are bored, a liquid coolant passing either through these holes or through pipes which are inserted in these holes. The alpha alumina product may be ground in a ball mill, and may be used for making ceramic articles, for example metal cutting tools or wire-drawing dies. The particle size of the a -alumina is preferably below 10 microns, with an average particle size of 1 micron or less.
GB26294/57A 1957-07-19 1957-08-20 Improvements in or relating to alumina Expired GB860896A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DEK32490A DE1084705B (en) 1957-07-19 1957-07-19 Process for the production of fine-grain corundum, which is particularly suitable for metal-ceramic purposes
NL219312A NL106208C (en) 1957-08-20 1957-07-25
FR1180103D FR1180103A (en) 1957-08-20 1957-07-25 Process for obtaining aluminum oxide in fine grains, intended in particular for the manufacture of sintered articles usable in metallurgy
BE559643D BE559643A (en) 1957-08-20 1957-07-29
CH360980D CH360980A (en) 1957-08-20 1957-07-30 Process for the production of fine-grained aluminum oxide
GB26294/57A GB860896A (en) 1957-08-20 1957-08-20 Improvements in or relating to alumina
US689497A US2982614A (en) 1957-08-20 1957-10-11 Process for producing alumina

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB26294/57A GB860896A (en) 1957-08-20 1957-08-20 Improvements in or relating to alumina

Publications (1)

Publication Number Publication Date
GB860896A true GB860896A (en) 1961-02-15

Family

ID=10241360

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26294/57A Expired GB860896A (en) 1957-07-19 1957-08-20 Improvements in or relating to alumina

Country Status (5)

Country Link
BE (1) BE559643A (en)
CH (1) CH360980A (en)
FR (1) FR1180103A (en)
GB (1) GB860896A (en)
NL (1) NL106208C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291011A (en) * 1978-11-24 1981-09-22 Griffiths Kenneth F Method for production of aluminum oxide

Also Published As

Publication number Publication date
CH360980A (en) 1962-03-31
NL106208C (en) 1963-10-15
FR1180103A (en) 1959-06-02
BE559643A (en) 1957-08-14

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