| 摘要 |
<p>Oxidic titanium bearing material is reacted with chlorine in the presence of carbon in a medium consisting of a melt of one or more chlorides or fluorides of alkali or alkaline earth metals to produce titanium tetrachloride. Specified metals are sodium, potassium, magnesium, calcium and barium; specified solid reactants are titanium dioxide, rutile, ilmenite and slags, and charcoal or coke in the form of powder, granules or lumps. The chlorine may be passed into the fused salt bath whilst the solids are charged on to the surface of the bath or the solid reactants may first be entrained in the chlorine and the mixture passed into the fused salt bath. In carrying out the latter method, there may be used an electrically-heated, brick-lined furnace constructed of steel plates. The solid reactants are fed by a screw conveyer into a vertical chlorine supply line, become entrained in the gas and are passed into a molten bath in the furnace; products pass out of the furnace through a pipe and thence to a dust collector, condenser for titanium tetrachloride and effluent stack. The fused salt bath is said to increase in bulk due to chlorination of impurities in the raw materials and may be discharged intermittently or continuously during the process. Examples are given in which the temperature of chlorination is 850 DEG or 900 DEG C.</p> |
