Separation of Columbium, Tantalum, Titanium, and Zirconium from Titanium Chlorination Residues.
Columbium, tantalum, titanium, and zirconium are present in solid- waste products generated by the chlorination of the rutile used in the production of titanium tetrachloride (ticl4). The columbium and tantalum were separated from titanium and zirconium by liquid-liquid extraction techniques using a secondary amine. Salts of these elements are in a leach liquor produced by water leaching of mineral waste from the chlorination of rutile. This waste, produced at the rate of approximately 50,000 tons per year, is about 40 wt pct water soluble. Leach liquors, separated by filtration, were further separated into a solid fraction and a liquid fraction by pressure hydrolysis. The solid fraction containing cb, ta, ti, and zr was dissolved in hcl-hf and used as a feed solution. Columbium and tantalum were removed from the organic extractant with 1 n hcl. A miniature 10-stage reactor showed that the columbium and tantalum present in solution could be separated with a continuous flow.