METHOD FOR PRODUCING TITANIUM CONCENTRATE

摘要

1383398 Upgrading ilmenite MITSUBISHI KINZOKU KOGYO KK 5 April 1972 [7 April 1971 8 April 1971] 15602/72 Headings C1N and C1A Ti ore is upgraded by (a) roasting in an oxidizing atmosphere at a temperature of at least 850‹ C. to decompose the ilmenite into pseudo-Brookite and rutile, (b) mixing with a reducing agent, (c) selectively chlorinating the iron content in a fluidized bed in the presence of a reducing agent, (d) recovering the titanium ore having a residual iron content as Fe of 4% to 6% and (e) leaching with water or acid. In step (a) the ore may be fluidized with air at 850-900‹ C. to give the mixture of pseudo- Brookite and rutile. The reducing agent may be calcined oil coke ground to - 20 mesh. Step (c) may be effected at 800-1000‹ C. using Cl 2 or HCl. The effluent gas may be treated to remove dust and cooled to precipitate solid FeCl 3 . The FeCl 3 may be oxidized to give Fe 2 O 3 and the Cl 2 recycled. Step (d) may be effected at 80‹ or 25‹ C. using HCl or H 2 SO 4 . Excess reducing agent may then be separated by flotation and the ore heated at above 800‹ C. The ore may then be treated electrostatically to remove SiO 2 and Al 2 O 3 . Some treated ore may be recycled to step (b).