| 摘要 |
PURPOSE:To obtain a long fibrous alkali metal salt of a titanic acid which has a large aspect ratio and high mechanical strength such as bending strength and tensile strength by calcining a mixture composed of a titanium source compd., oxygen-contg. alkali metal compd. and a slight amt. of oxygen-contg. iron compd. in a specific temp. range. CONSTITUTION:The mixture composed of the titanium source compd., oxygen- contg. alkali metal compd. and a slight amt. of the oxygen-contg. iron compd. is calcined in a temp. range of about 900-1,350 deg.C. The mixing ratio of the titanium source compd. and the oxygen-contg. alkali metal compd. is preferably 4.0-2.2 molar ratio of TiO2/M2O (M is an alkali metal) and the ratio of the oxygen-contg. iron compd. to be added is preferably not in excess of 0.4 molar ratio of Fe2O3/TiO2. The nitrate of an alkali metal is particularly preferable as the oxygen-contg. alkali metal compd. The oxygen-contg. iron compd. is exemplified by the nitrate, sulfate, chloride, oxide, hydroxide, etc., of iron. The titanium source compd. is exemplified by titanium oxide, rutile ore, titanium hydroxide wet cake, hydrous titania, etc.
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