Investigation of Scheelite Instead of Ferrotungsten in Steelmaking

This paper describes the fundamental theory, addition methods, optimum addition weight of scheelite instead of ferrotungsten in steelmaking and the yield of tungsten as well as the influence of using scheelite on the quality and the properties of steel. Results show that the optimum addition weight of scheelite is 5% W, the yield of tungsten is about 98 % and the economic and social benefit are obvious on the premise of having no influence on heat time and power consumption.

Scheelite is a calcium tungstate mineral with the chemical formula CaWO4. It is an important ore of tungsten. Well-formed crystals are sought by collectors and are occasionally fashioned into gemstones when suitably free of flaws. Scheelite has been synthesized via the Czochralski process; the material produced may be used to imitate diamond, as a scintillator, or as a solid state lasing medium. It was also used in radium paint in the same fashion as was zinc sulphide, and Thomas Edison invented a fluoroscope with a calcium tungstate-coated screen, making the images six times brighter that those with barium platinocyanide; the latter chemical allowed Röntgen to discover X-rays in early November 1895.


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