Use of a fine-grained product produced during the production of titanium dioxide
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United States of America Patent
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Sep 24, 2002
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app pub date -
Apr 13, 2001
filing date -
Jul 6, 1998
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Abstract
A fine-grained product with a grain size of 100%<5 mm is obtained during the production of titanium dioxide in the chloride method in which titanium-containing raw material is reacted with gaseous chlorine in the presence of a carbon-rich substance, preferably coal and/or coke, in a chlorination reactor, preferably with a fluidized bed, to form titanium tetrachloride, the fine-grained product consisting, in the dried state, of the main constituents TiO.sub.2, coal and SiO.sub.2, mixed with filter salt (iron sulfate that is obtained during dilute acid recovery), residues containing TiO.sub.2 from TiO.sub.2 -production according to the sulfate method, coal, sulfur, and ilmenite/TiO.sub.2 -slag. This mixture is treated in a fluidized bed furnace or rotating tubular furnace at temperatures of 900 to 1,300.degree. C. The mixture is used as a flux for the purpose of improving the durability of the brick lining of a furnace for the smelting-metallurgical production of metallic materials.
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