And acid-base reaction of tungsten and molybdenum
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- Category: Molybdenum knowledge
- Published on 28 July 2014
- Written by ling
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When not heated, the tungsten is not as hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid and aqua regia and the effect of any concentration. Heated to 80 ~ 100 ℃, hydrofluoric tungsten remains stable, the occurrence of weak hydrochloric acid and sulfuric role of nitric acid and aqua regia starts significant tungsten erosion. At room temperature, rapidly dissolved in nitric acid of tungsten: 4:1 mixture of hydrofluoric =. MoSi2 acid stability is poor. When not heated, the temperature of MoSi2 in hydrochloric acid and sulfuric acid, 80 ~ 100 ℃ slightly when dissolved. When nitric acid and aqua regia can slowly dissolve without heating molybdenum dissolves rapidly when heated. 5 volumes of nitric acid, sulfuric acid and a mixture of 3 volumes of 2 volumes of water for dissolving the molybdenum tungsten wire spiral.
Tungsten and molybdenum are stable in cold alkali solution, heating slightly eroded by an alkaline solution.
When air or oxidant through (NaNO3, NaNO2, KNO3, KCeO3, PbO2) in the presence of molten alkali and strong dissolving tungsten and molybdenum oxide, tungsten to generate the alkali metal salts and molybdate salts.
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