| 摘要 |
<p>Ilmenite ore is reduction roasted at 600-900 degrees C and is then leached with hot aqueous HCl soln. The resultant soln. of TiCl3 and FeCl2 is cooled and saturated with gaseous HCl to ppt. FeCl2, which is separated, after which the residual soln. is heated to 20-30 degrees C. to ppt. hydrated TiCl3 which is separated. Pref. leaching is carried out at 80-110 degrees C, and saturation of the leach soln. with HCl at 0-20 degrees C. The invention is directed to recovery of Ti from ilmenite with improved separation from impurities, particularly iron, than is possible by recovery as TiCl4.</p> |
