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1. Extractive metallurgy
1.1 Minerals and ores
Tungsten, chemical symbol W, is a rare metal: its content in the earth's crust is estimated at 10
– 6
by mass. Mineable mineral salts are scheelite CaWO
4
and wolframite (Fe, Mn)WO
4
The average WO 3 wolfram anhydride content of current mining projects is 0.4%. The most abundant deposits are in the countries of the Pacific Ring of Fire. The European contribution is small: Portugal, Spain, France (Salau, Ariège), Austria and Sweden. Soviet deposits are found...
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Extractive metallurgy
Production. Implementation
References
Standardization
United States
American Society for Testing and Materials ASTM
- Test method for apparent density of powders of refractory metals and compounds by the Scott volumeter. - B 329-81 -
- Test method for average particle size of powders of refractory metals and compounds by the Fisher sub-sieve sizer. - B 330-82 -
- Test method for particle size distribution of refractory metal-type powders by turbidimetry....
Manufacturers. Suppliers
France
Tungsten powders and tungstic products
Eurotungstène Powders.
Heavy alloys and wrought tungsten
Cime BocuzeTungsten division.
Germany (Federal Republic of)
Tungsten powders and tungstic products
Starck Berlin Hermann C.
Austria
Tungsten powders and tungstic products
Wolfram...
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