Process for the production of titanium tetrachloride and iron oxide pigments

摘要

1,144,050. Ti and Fe chlorides and oxides. FABRIQUES DE PRODUITS CHIMIQUES DE THANN ET DE MULHOUSE and CABOT CORP. 2 Nov., 1967, No. 49965/67. Heading C1A. TiCl 4 and Fe 2 O 3 are prepared by chlorinating a heated fluidized bed of titaniferous ore or slag mixed with coke, to produce TiCl 4 and FeCl 3 , separating the FeCl 3 by selective condensation, revaporizing it, and reacting it with free oxygencontaining gas at a temperature above 600‹ C. to produce Fe 2 O 3 and then recycling the resulting chlorine to the beginning of the process. Titaniferous ore such as ilmenite, titaniferous magnetite, or slags, of particle size 60 to 160 U.S. mesh is mixed with 15-30% by weight of coke of particle size 20-100 mesh, is preheated by passing oxygen-containing gas therethrough, prior to chlorination by chlorine, phosgene, or CCl 4 gas, the former being preferred. A mixture of TiCl 4 , FeCl 3 and chlorides of Si, Al, V, Cr and Zr is produced and the chlorides of Fe, Cr, Zr and Al are condensed out in a first stage of a selective condenser, the remaining chlorides condensing in the second stage, whence impure TiCl 4 is obtained and then purified. The impure FeCl 3 is separated from the other metal chlorides by revaporization and the pure vapour is oxidized by free oxygen-containing gas (e.g. air) to give pure Fe 2 O 3 and Cl 2 which is recycled. The TiCl 4 may be oxidized to TiO 2 .