| 摘要 |
<p>1,155,080. TiO 2 concentrates; TiCI 4 . NATIONAL LEAD CO. 26 Sept., 1967 [21 Oct., 1966], No. 43874/67. Headings C1A and C1N. A TiO 2 concentrate for chlorination to make TiCi 4 is produced by passing H 2 through a bed of ilmenite having an Fe<SP>3+</SP>: Fe<SP>2+</SP> wt. ratio of at least 1: 1 to reduce the iron fraction to metal, removing the gangue, leaching with dilute acid to dissolve the Fe and generate H 2 , and drying and recycling the H 2 . The ilmenite is preferably beach sand of particle size -40 to +200 mesh (Tyler). Reduction may be effected at atmospheric pressure and 760-900‹ C., or at 100-400 psig and 540-760‹ C., using a fluidized bed tube furnace. The gangue may be separated magnetically. Leaching may be effected with 5-25% H 2 50 4 (e.g. waste acid from the sulphate process) at 20-100‹C. The H 2 may be dried to a moisture content of 0À2- 0-5% by wt. The concentrate may be mixed with petroleum coke and reacted with C1 2 in a fluidized bed at 850‹ C. to form TiCl 4 .</p> |
