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AssigneeMizusawa Kagaku Kogyo Kabushiki Kaisha
InventorsYujiro Sugahara, Yoshibumi Noshi, Hiroyuki Naito, Kiyoshi Takai, Noboru Maruyama
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A method of treating raw materials containing components of metals of the group IVb of the Periodic Table, which comprises heat-treating a raw material of a component of a metal of the group IVb of the Periodic Table containing coloring poisonous metal components such as Mn, V and Cr components in the presence of a flux composed mainly of an alkali metal nitrate or an alkali metal peroxide which is a thermal decomposition product of the alkali metal nitrate in an amount 2 to 5 times the amount of the raw material on the weight basis in a non-reducing atmosphere to thereby effect fluxing reaction, and subjecting the resulting fluxing reaction product to a leaching treatment of at least one stage in an aqueous medium to separate the fluxing reaction product into said coloring metal components and a concentrate of the component of the group IVb of the Periodic Table which is acid-soluble and substantially free of said coloring poisonous metal components. In practising this treating method, if a residue left after the above leaching step is incorporated into a mixture of the raw material and the flux, the composition is granulated and the granulated composition is heat-treated, the fluxing reaction of the raw material can be accomplished while keeping the granulated composition in the substantially non-sticky granular state throughout the fluxing heat treatment.
In a method of treating a titanium containing raw material selected from the group consisting of ilmenite, sand iron slag and high titanium slag by heat-treating the raw material in the presence of a flux composed mainly of an alkali metal nitrate or a thermal decomposition product thereof in an amount 2 to 5 times by weight of the amount of raw material in a non-reducing atmosphere to thereby effect a fluxing reaction, and subjecting the resulting fluxing reaction product to a leaching treatment of at least one stage in an aqueous medium to separate the fluxing reaction product into a leaching solution containing at least one metal component selected from the group consisting of Mn, V and Cr and a leaching residue composed of a concentrate of titanium component which is acid-soluble and substantially free of the metal component, the improvement which comprises incorporating said leaching residue in an amount at least 1.2 times by weight the amount of said raw material into the mixture of said raw material and said flux, shaping the resulting composition into granules, and heat-treating said granules at a temperature of 750.degree. to 950.degree. C for a time within the range of 3 minutes to 2 hours thereby keeping said granules in the substantially non-sticky state throughout the heat treatment.
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