| 摘要 |
<p>1492634 Titanium tetrachloride ISHIHARA SANGYO KAISHA Ltd 21 March 1975 [23 March 1974] 12025/75 Heading ClA TiCl 4 is made by chlorinating a titaniferous material in the form of fine particles at least 20% by weight of which pass through 200 mesh Tyler standard sieve with a Cl 2 -containing gas in the presence of a solid carbonaceous reducing agent in a reaction zone of which the cross-sectional area of an upper part is 1À2-10 times as large as that of a lower part, the solid raw materials being introduced into the reaction zone at at least two locations, at least one of the locations being in the upper part and another being in the lower part of the reactor and the Cl 2 -containing gas being introduced below or at the lowest of the locations at which solids are introduced as an upward flow into the reaction zone to maintain a dilute phase fluidization system therein accompanied by reflux of part of the solid raw material particles. Suitable titaniferous materials includes ores such as rutile and ilmenite and concentrates such as slag. The TiO 2 content is preferably at least 50% by weight. The reducing agent may be charcoal or coke and usually makes up 10-40% by weight of the solids. The chlorination is suitably carried out at 900-1400‹ C. and the maximum linear velocity of the gas in the reactor is 1-10 m./sec. The reactor preferably has a circular or polygonal section and may be of conical or upwardly stepwise widening form. The solid raw material fed into the lower part of the reactor preferably consists of comparatively fine solid raw materials, e.g. that carried over from the reaction and recycled. The gas may be fed in with the lower solids feed or separately.</p> |
