| 摘要 |
<p>1,225,826. Upgrading Ti ore. COMMONWEALTH SCIENTIFIC & INDUSTRIAL RESEARCH ORGANIZATION, and MURPHYORES Inc. PTY. Ltd. 26 April, 1968 [1 May, 1967], No. 18027/68. Headings C1A and ClN. A Ti ore containing Fe, e.g. ilmenite, is upgraded by oxidizing the Fe values to Fe<SP>3</SP>+, reducing the Fe<SP>3+</SP> to Fe<SP>2+</SP> with at most 20% by wt. of the ore as metallic Fe, and leaching to remove the Fe values. Oxidation may be effected at 870-900‹ C. using 0 2 , air, C0 2 or H 2 0. Reduction may be effected at 850- 900‹ C. using H 2 , CO, hydrocarbon gases, or mixtures thereof (e.g. water gas, producer gas, H 2 rich reformer gas) or carbon. The reactions may be effected in stationary or fluidized beds, or by a countercurrent process. Leaching may be effected at 105-110‹ C. using 20% HCl. The Ti0 2 product is washed, dried, and calcined at 800-850‹ C., and may be chlorinated to form TiC14 (which is oxidized to TiO 2 ) or reacted with H 2 S0 4 . The FeCl 2 leach liquor may be treated with steam to form HC1 vapour (which is recycled as acid) and Fe 2 O 3 . If the ore contains chromite, the Fe content of the chromite is unchanged by the process, and the TiO 2 product may be separated magnetically from the chromite after leaching.</p> |
