Production and for General information about tungsten
Are you interested in mining and for General information about tungsten? Supplier KMZ offers to buy tungsten and tungsten alloys at economical price. Supplier guaranteed timely delivery at any address specified by the consumer.
Extraction of tungsten
This metal is extracted from two types of minerals: wolframite and scheelite. Extraction from secondary raw materials) makes up about 30% of the world supply. The world’s largest producer, providing more than 80% of global supply, is China. Large deposits of this metal are also available in Russia, Bolivia and the United States. However, existing technology for production of tungsten is not characterized by ecological purity, so the US prefer to import the finished product from other countries than to produce it at home.
After treatment and separation of the tungsten ore is obtained an intermediate chemical form, ammonium paratungstate, which is heated in the presence of hydrogen with the formation of tungsten oxide. The alternative is heating the ammonium paratungstate together with the carbon to temperatures превышающих1050 ° C. the resulting oxides WO, W2 O5 restore to bare metal.
For General information about tungsten
This is a brilliant white metal in its pure form is quite flexible and malleable, Usually, however, it contains small concentrations of carbon and oxygen, which give tungsten hardness and brittleness. It has the highest melting point of all metals (3422 ± 15 °C). At this temperature, most of the other tech metals (Fe, Al, Cu, Ti) have already evaporated. Its boiling point is about 5700 ° C. Having a density of 19.25 g/cm3, it applies to most heavy metals. Its electrical conductivity at 0 °C is about 28% of the conductivity of silver .
|The temperature of the receiving data characteristics of t°C||20°C|
|The linear thermal expansion coefficient α [1/Deg]||43x10−6|
|Tensile strength tensile kg/mm2||35|
|Specific heat at 20 °C [kJ/(kg·deg)]||0,134|
|The thermal conductivity K [W/(m·K)]||300,173|
|Electrical resistivity R Омхмм2/m||0,054|
Tungsten has the lowest vapor pressure of all metals, very high module of compression and elasticity, very high creep resistance and high thermal conductivity and electrical conductivity. It is the most important metal for applications in terms of thermal emission, not only because of its high emissivity of electrons (due to the addition of foreign elements), but also because of the high thermal and chemical stability.
Are you interested in mining and for General information about tungsten? Supplier KMZ offers to buy tungsten and its alloys at economical price. Supplier guaranteed timely delivery at any address specified by the consumer.
Buy rare and refractory metals from a vendor KMZ can at an affordable price. The price is formed based on the European standards of production. Buy tungsten and its alloys at a reasonable price, you can wholesale or retail. Regular customers can take advantage of the discount system of discounts from the company KMZ.
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