Preparation of Niobium Tantalum Chloride and Purification from Iron Impurities

Preparation of Niobium (Tantalum) Chloride and Purification from Iron Impurities. Assemble an apparatus as shown in Fig. 124. Place activated carbon preliminarily dried in vacuum during two hours at 200-250 Cinto section III of the reactor. Mix 2 g of niobium (tantalum) and 0.5 g of iron in a porcelain boat and place them in section I. Fill columns 5 and 6 with a mixture of glass wool and phosphoric anhydride, and fill wash bottle 7 with sulphuric acid. 

Displace the air from the apparatus with a stream of dry carbon dioxide. Switch on furnace 1 and 2, and raise the temperature in 

---