Tungsten is the world's rare a non-ferrous minerals, the annual output is very low, use very extensive, mainly used for casting ingredients with raw materials. Tungsten comes from a white sand mold ore bodies, ore line special tiny, after mining, grinding, water re-election, refining and multichannel process, get grade reached more than 95% of the tungsten powder, and then after high temperature furnace refining molding production of finished product is tungsten bars. Tungsten melting point: 3500 ℃. At present tungsten ore are mainly distributed in China and Russia, China is now the world's largest exporter of tungsten. Usually the purity of tungsten rod should be in the 99.98% above