1. Tungsten trading forms
The various commercial forms of tungsten are :
ores and concentrates (scheelite, wolframite) ;
tungstates: sodium tungstate, ammonium metatungstate (AMT) and especially ammonium paratungstate (APT);
oxides: trioxide WO 3 , blue oxide (TBO) and tungstic acid H 2 WO 3 ;
tungsten metal powders ;
WC tungsten carbide powders ;
fused carbide powders (eutectic WC-W 2 C) ;
ferrotungsten ;
tungstic waste ;
...
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Tungsten trading forms
Tungsten applications
Economic data
See
Bibliography
References
- (1) - WEEKS (M.-E.) - Discovery of the elements (La découverte des éléments). - Chapter 9 : Chromium, Molybdenium, Tungsten, Uranium, pp. 253-258. Chapter 10 : Contributions of the Elhuyar brothers, p. 284-310 (1960), Journal of Chemical Education, Easton, PA, USA (6th edition). Voir aussi : J. Chem. Educ. 11 (1934), pp....
Standardization
French Standards Association (AFNOR)
French standards are increasingly based on European EN and international ISO standards.
- Sieving and granulometry - Determining the mass or volume area of powders by permeabilimetry – Method by Lea and Nurse. - NF X11-601 - sept. 1979
- Determination of the mass area (specific surface) of powders by gas adsorption - B.E.T. method. – Volumetric measurement...
Organization
International Tungsten Industry Association (ITIA)
ITIA was formally inaugurated in Brussels in February 1988 and registered as a scientific association under Belgian law. Some 60 companies (mining companies, producers, consumers, trading companies) from 19 countries are members of the association. It is extremely useful in distributing and exchanging valuable information on tungsten between the various groups and...
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