Tungsten(VI) oxide, also known as tungsten trioxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals. Tungsten ores are treated with alkalis to produce WO3. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal.
- 2 WO3 + 3 C + heat → 2 W + 3 CO2
- WO3 + 3 H2 + heat → W + 3 H2O
Tungsten(VI) oxide occurs naturally in form of hydrates, which include minerals: tungstite WO3·H2O, meymacite WO3·2H2O and hydrotungstite (of same composition as meymacite, however sometimes written as H2WO4). These minerals are rare to very rare secondary tungsten minerals.
Other articles related to "tungsten, tungsten trioxide":
... However in the mid-1960s work on the prospect was recommenced by British Tungsten Ltd, owned by Canadian entrepreneur W.A.Richardson ... In 1969 a planning application for opencast working of tin, tungsten and china clay was submitted, but it was withdrawn before a decision could be made ... Further work commencing in 1970 by British Tungsten Ltd increased the resource to 5.6 million tonnes of ore ...
... Tungsten trioxide is used for many purposes in everyday life ... In recent years, tungsten trioxide has been employed in the production of electrochromic windows, or smart windows ... quantum yield of 19% in photocatalytic water splitting with a caesium-enhanced tungsten oxide photocatalyst ...