Toho Titanium Co., Ltd.

Matsuhide Horikawa

Hideki Sakai

Daisuke Suzuki

Wataru Kagohashi

Eiichi Fukasawa

Seiichiro Tani

Hideki Fujii

Ryota Horiguchi

Haruka Yamamoto

A method for producing metal titanium by carrying out electrolysis using an anode and a cathode in a molten salt bath, the method using an anode containing metal titanium as the anode, the method comprising a titanium deposition step of depositing metal titanium on the cathode, wherein, in the titanium deposition step, a temperature of the molten salt bath is from 250&#xb0; C. or more and 600&#xb0; C. or less, and an average current density of the cathode in a period from the start to 30 minutes later of the titanium deposition step is maintained in a range of 0.01 A/cmto 0.09 A/cm.

Method for producing metal titanium

A molten salt electrolyzer having a metal collection chamber, an electrolysis chamber, and two or more electrolytic cell units positioned in the electrolysis chamber. Each electrolytic cell unit has a cathode having an inner space in a prism form; at least one bipolar electrode in a rectangular cylinder form and disposed in the cathode inner space; and an anode in a prism form and disposed in an inner space of the bipolar electrode. At least part of individual planes forming an outer side of the bipolar electrode closest to the cathode faces a plane forming the prism-form inner space of the cathode. At least part of individual planes forming the inner side of the bipolar electrode closest to the anode faces a plane forming the prism of the anode. At least one plane of the cathode constitutes one plane of a cathode of another electrolytic cell unit.

Molten salt electrolyzer, and method for producing metal magnesium using the same and method for producing a titanium sponge

A technique is provided in which valuable material is recovered from solid recovered material generated during chlorinating process of titanium-containing raw material, and in particular, in which chlorine gas and titanium-containing raw material can be efficiently separated and recovered from the solid recovered material. The method for production of titanium tetrachloride includes: a chlorinating process in which titanium-containing raw material, coke and chlorine are reacted, a recovering process in which chlorine gas, titanium oxide and coke are recovered by treating solid recovered material which is byproduced during the chlorinating process, and a reusing process in which these recovered material are reused as raw material for the chlorinating process.

Titanium-tetrachloride manufacturing method

A technique is provided, in which impure metal is efficiently separated and removed from titanium-containing raw material such as titanium slag or ilmenite and high titanium-containing raw material is produced. The method for improving quality of titanium-containing raw material containing slag, including steps of: oxidizing the titanium-containing raw material, selectively chlorinating impurities in the titanium-containing raw material, and separating and removing the impure chlorides to obtain high titanium-containing raw material. Alternatively, in this method, the oxidizing treatment and the selective chlorinating treatment are performed simultaneously.

Method for improving quality of titanium-containing feedstock

A method for producing titanium tetrachloride is provided, in which valuable materials such as unreacted titanium-containing raw material, carbon raw material and chlorine can be recovered from solid recovered material generated in chlorinating process of titanium-containing raw material, and titanium-containing raw material can be efficiently used. The treatment method of titanium-containing raw material includes the steps: separating and removing impurities selectively from the titanium-containing raw material as chlorides so as to obtain high titanium-containing raw material, producing titanium tetrachloride using the high titanium-containing raw material, and performing separating process of impurities from solid recovered material byproduced in the production of titanium tetrachloride, together with selective chlorinating treatment of the titanium-containing raw material. Thus, the high titanium-containing raw material can be produced while recovering chlorine and impure oxides.

Method for treating titanium-containing feedstock

A process for production of a barium titanate powder, the process comprises adding an aqueous solution of a titanium compound and an aqueous solution of a barium compound and an alkali metal hydroxide into an alkaline solution under stirring, thereby contacting the aqueous solutions with each other while controlling the molar ratio of the titanium compound to the barium compound to be within the range of 0.8 to 1.2.

Method for producing barium titanate powder

A barium titanate powder has an average particle size ranging from 0.1-1.0 &mgr;m, a CV value (standard deviation of the particle size/the average particle size) of the particle size distribution being 40% or less, and a zeta-potential ranging from &minus;30 to &minus;60 mV measured by a laser Doppler method using electrophoresis at pH 6.4. The barium titanate powder is presintered at a temperature ranging from 900 to 1200&deg; C. The barium titanate powder has superior dispersion characteristics in slurrying, and is capable of partly inhibiting agglomeration of the barium titanate after sintering. It is therefore suitable as materials for dielectric layers of multilayer ceramic capacitors. In particular, the barium titanate has a sintered density of 95% or more of the theoretical density thereof, and the dielectric constant is 4000 or more.

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Chigasaki, Japan

Matsuhide Horikawa