Two new types of balance for determination of density

• Publisher: Elsevier Science
• Year: 1914
• Tongue: English
• Weight: 53 KB
• Volume: 177
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(14)91109-7

✦ Synopsis

Preparation of Metallic Tungsten. G. ERHARD. (Metallurgie, ix, 44I.)--This paper discusses the various methods of obtaining metallic tungsten, and the conclusion is reached that the preparation of tungstic acid is the best intermediate stage. The purified sodium "tungstate, obtained by fusion of the ore with 60 per cent. sodium carbonate, was treated with hydrochloric acid containing 6 per cent. of nitric acid, and the tungstic acid thoroughly washed to remove alkaline salts. After completely drying, ioo kilos, of tungstic acid were mixed with 14.1 kilos, of pure charcoal and 2 kilos, of rosin, and heated to 14oo ° C. in a crucible the lid of which was carefully luted. The agglomerated metal was then finely ground and elutriated in the usual way, yielding a product containing 96.5 per cent. of pure metal.