Home  ›  Alumina

Alumina

Alumina
Crystalline structure of corundum
Crystalline structure of corundum
General
Thesaurus Aluminum Oxide
bauxite
CAS No. 1344-28-1
EINECS No. 215-691-6
PubChem 14769
SMILES
g mol -1
Al 52.93%, 47.07% O,
Physical Properties
Melting temp 2054 C
Density 3.97 g cm -3
Thermal conductivity 10.9 W m -1K -1 (500 C);
6.2 W m -1K -1 (1000 C)
Thermochemistry
S 0liquid, 1 bar 67.24 J K -1 mol -1
S 0solid 50.92 0.10 J K -1 mol -1
f H 0liquid -1 620.57 kJ mol -1
f H 0solid -1 675.7 1.3 kJ mol -1
C p 795.6 J K -1kg -1 (25-1 800 C)
Precautions
WHMIS
Not Controlled
Properties of alumina
Property Value
Expansion coefficient at 25 C 7.1 10 -6 K -1
Thermal conductivity at 25 C 0.46 J.cm -1. S -1 K -1
Dielectric constant at 25 C 10,6
resistivity at 14 C October 19 .cm

By its physical properties, alumina which forms naturally on the surface of the aluminum by exposure to oxygen from the air, as, unlike the rust in the case of iron , a protective layer that prevents tight the rest of aluminum from being oxidized.

polymorphs of alumina

Variety Lattice Chemical Name Chemical Formula Temperature range
Training ( C) 		Density
Amorphous alumina _ Aluminum Oxide Al 2 O 3 <50-60 3,40
Bayerite Monoclinic Trihydroxide aluminum (Alpha) -Al (OH) 3 60-90 2,53
Boehmite Orthorhombic Trihydroxide aluminum (Gamma) -AlOOH > 90 3,01
Corundum hexagonal Aluminum Oxide (Alpha) -Al 2 O 3 > 350 3,96

Production Statistics

World production of alumina. Source: International Aluminium Institute
Unit: 1000 tons Africa America
North 		America
Latin 		Asia Europe
(With Russia) 		Oceania Total
1974 655 8174 4226 2409 3961 4918 24343
1979 656 7344 4003 1877 4768 7386 26034
1984 550 5750 4604 2116 5232 8800 27052
1989 626 5942 6647 2493 5006 10823 31537
1994 648 5533 8177 2338 5975 12840 35511
1999 569 5915 10865 4050 10008 14378 45785
2003 731 6084 12477 5178 11319 16792 52581

Source

International Aluminium Institute ( http://www.world-aluminium.org/iai/stats/index.asp )
The values include alumina for aluminum production (the largest share) and the alumina to other uses.

References section

  1. a , b , c and d ALUMINUM OXIDE , safety record of the International Programme on Chemical Safety , accessed May 9, 2009
  2. molar mass calculated from Atomic Weights of the Elements 2007 on www.chem.qmul.ac.uk
  3. a and b (in) Raymond C. Rowe, Paul J Sheskey, Marian E. Quinn, Handbook of Pharmaceutical Excipients, Pharmaceutical Press and American Pharmacists Association, 2009, 6th ed., 888 p. ( ISBN 978 0 792 85369 3 ) p. 377
  4. a and b "Aluminum Oxide in the database Hazardous Substances Data Bank, accessed June 4, 2010
  5. a , b , c and d (in) "Aluminum oxide" on NIST / WebBook , accessed June 4, 2010
  6. " Aluminum oxide (alpha) "in the database of chemicals Reptox the CSST (Quebec organization responsible for safety and health at work), accessed April 25, 2009

See also

Related articles

Links and external documents

  • (In) Handbook of porous solids volume 3 - Wiley-VCH (2002) -

Leave a Reply

0 vote, average: 0.00 out of 50 vote, average: 0.00 out of 50 vote, average: 0.00 out of 51 vote, average: 0.00 out of 50 votes, average: 0.00 out of 5 (0 votes, average: 0.00 out of 5, rated)
Loading ... Loading ...
Help us improve the wiki Send Your Comments