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我矿对测定钨的几种方法作过对比,认为以银粉还原容量法测定钨是较好的方法,已正式投入使用。分析手续称取试样0.2～0.5克于预先垫有过氧化钠1.5～3克的铁坩埚中,表面复盖过氧化钠0.5克,移入700～800℃马弗炉中熔融5～7分钟,取出冷却,移入预先盛有20～25毫升水的150毫升烧杯中,浸取并洗净坩埚(体积在50～70毫升左右)冷却,移入100毫升容量瓶中,用水洗烧杯2～3次,然后以水稀释至刻度干过滤。
I mine several methods for the determination of tungsten compared, that the silver reduction capacity of tungsten is a better method, has been officially put into use. Analysis procedures Weigh the sample 0.2 to 0.5 grams of pre-padded with 1.5 to 3 grams of sodium iron crucible, the surface covered with 0.5 grams of sodium peroxide, into the muffle furnace at 700 ~ 800 ℃ melting for 5 to 7 minutes, Remove the cooling, into pre-filled with 150 ml beaker 20 ~ 25 ml of water, leach and wash the crucible (volume 50 ~ 70 ml or so) cooling, into a 100 ml volumetric flask, beaker 2 to 3 times with water, Then diluted with water to the mark dry filtration.