三氧化钨 Tungsten trioxide
（重定向自Tungstic oxide）
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三氧化钨（化学式：WO3）是钨(VI)的氧化物，是从钨矿制取单质钨工业的重要中间体。该冶炼过程涉及两步：第一步用碱处理钨矿，制得WO3，然后用碳或氢气还原三氧化钨，得到金属钨：
- WO3 + 3H2 → W + 3H2O
- 2WO3 + 3C → 2W + 3CO2
Tungstic oxide
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Tungsten trioxide 三氧化钨
（重定向自Tungstic oxide）
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.
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