Patents Assigned to Nittetsu Mining Co., Ltd.
  • Patent number: 10035710
    Abstract: The present invention provides a method for producing lithium carbonate, that can shorten the time required in the production of lithium carbonate and has excellent maintenance property and production efficiency without forming fixed matters that require complicated procedures to remove in a reaction apparatus.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: July 31, 2018
    Assignees: NITTETSU MINING CO., LTD., Sumitomo Corporation
    Inventors: Masanobu Kawata, Kohei Mitsuhashi, Akemitsu Iida, Yutaka Yamaguchi, Atsushi Moriya
  • Publication number: 20170113942
    Abstract: The present invention provides a method for producing lithium carbonate, that can shorten the time required in the production of lithium carbonate and has excellent maintenance property and production efficiency without forming fixed matters that require complicated procedures to remove in a reaction apparatus.
    Type: Application
    Filed: October 26, 2016
    Publication date: April 27, 2017
    Applicants: NITTETSU MINING CO., LTD., SUMITOMO CORPORATION, TOYO ENGINEERING CORPORATION
    Inventors: Masanobu KAWATA, Kohei MITSUHASHI, Akemitsu IIDA, Yutaka YAMAGUCHI, Atsushi MORIYA
  • Patent number: 9255011
    Abstract: The present invention relates to a method for producing lithium carbonate, which is important as a raw material of a lithium ion battery and the like, from brine resources. More specifically, the invention relates to a method for producing lithium carbonate, in which carbon dioxide gas obtained by calcining limestone is introduced, in the presence of ammonia, into a concentrated brine, which is prepared from a lithium-containing brine as a raw material through an evaporative concentrating step, a desulfurizing step and an electrodialysis step, thereby depositing lithium carbonate crystals, and the crystals thus deposited are recovered through solid-liquid separation.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: February 9, 2016
    Assignees: NITTETSU MINING CO., LTD., TOYO ENGINEERING CORPORATION, SUMITOMO CORPORATION
    Inventors: Masanobu Kawata, Hirohumi Tanaka, Kohei Mitsuhashi, Ryo Kawarabuki, Youichi Yamamoto, Keita Kamiyama, Atsushi Moriya, Norifumi Sakai
  • Patent number: 8920763
    Abstract: The present invention relates to a method for producing lithium carbonate, the method including: mixing ammonia and carbon dioxide gas (carbonate gas) with an aqueous solution containing lithium chloride to conduct a carbonation reaction; and thereafter, recovering a produced solid by solid-liquid separation, and also relates to a method for producing high purity lithium carbonate.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: December 30, 2014
    Assignees: Nittetsu Mining Co., Ltd., Sumitomo Corporation
    Inventors: Yuji Tanimura, Kohei Mitsuhashi, Ryo Kawarabuki, Masanobu Kawata, Yutaka Yamaguchi
  • Publication number: 20130251610
    Abstract: The present invention relates to a method for producing lithium carbonate, which is important as a raw material of a lithium ion battery and the like, from brine resources. More specifically, the invention relates to a method for producing lithium carbonate, in which carbon dioxide gas obtained by calcining limestone is introduced, in the presence of ammonia, into a concentrated brine, which is prepared from a lithium-containing brine as a raw material through an evaporative concentrating step, a desulfurizing step and an electrodialysis step, thereby depositing lithium carbonate crystals, and the crystals thus deposited are recovered through solid-liquid separation.
    Type: Application
    Filed: November 29, 2012
    Publication date: September 26, 2013
    Applicants: NITTETSU MINING CO., LTD., SUMITOMO CORPORATION, TOYO ENGINEERING CORPORATION
    Inventors: Masanobu KAWATA, Hirohumi TANAKA, Kohei MITSUHASHI, Ryo KAWARABUKI, Youichi YAMAMOTO, Keita KAMIYAMA, Atsushi MORIYA, Norifumi SAKAI
  • Publication number: 20120237419
    Abstract: The present invention relates to a method for producing lithium carbonate, the method including: mixing ammonia and carbon dioxide gas (carbonate gas) with an aqueous solution containing lithium chloride to conduct a carbonation reaction; and thereafter, recovering a produced solid by solid-liquid separation, and also relates to a method for producing high purity lithium carbonate.
    Type: Application
    Filed: May 29, 2012
    Publication date: September 20, 2012
    Applicants: SUMITOMO CORPORATION, NITTETSU MINING CO., LTD.
    Inventors: Yuji TANIMURA, Kohei MITSUHASHI, Ryo KAWARABUKI, Masanobu KAWATA, Yutaka YAMAGUCHI
  • Patent number: 8034404
    Abstract: A method for producing a white powder, which includes forming on a surface of a base particle a titanium oxide film and a metallic silver film contiguously one upon another in this order, wherein the base particle includes a magnetic material, and wherein said step of forming on the surface of the base particle the titanium oxide film includes dispersing the base particle in a buffer solution and adding a titanium salt aqueous solution while agitating the dispersion.
    Type: Grant
    Filed: June 9, 2003
    Date of Patent: October 11, 2011
    Assignees: Nittetsu Mining Co., Ltd.
    Inventors: Akira Kishimoto, Takafumi Atarashi, Shinichi Ogura, Kiyoshi Hoshino, Tetsurou Hoshiba, Katsuto Nakatsuka
  • Patent number: 7985397
    Abstract: A method of treating hydrogen sulfide or producing hydrogen which comprises disposing a liquid tank having a photocatalyst electrode comprising a photocatalyst and a liquid tank having a metal electrode so that the two liquid tanks are separated from each other by a cation-exchange membrane, placing a liquid containing either hydrogen sulfide or an organic substance in the liquid tank having the photocatalyst electrode, electrically connecting the photocatalyst electrode to the metal electrode, and exposing the photocatalyst to a light. The liquid to be placed in the liquid tank having the metal electrode preferably is an acidic solution. The photocatalyst preferably comprises a metal sulfide, and preferably is fine particles having a layered nanocapsule structure.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: July 26, 2011
    Assignees: Nittetsu Mining Co., Ltd., Tohoku University
    Inventors: Hiromichi Matsumoto, Akira Kishimoto, Kazuyuki Tohji
  • Patent number: 7922991
    Abstract: Basic magnesium carbonate comprising a tubular aggregated particle of flaky fine crystals.
    Type: Grant
    Filed: February 12, 2003
    Date of Patent: April 12, 2011
    Assignee: Nittetsu Mining Co., Ltd.
    Inventors: Kohei Mitsuhashi, Katsuyuki Tanabe, Naoki Tagami
  • Patent number: 7704914
    Abstract: A photocatalyst which has high catalytic activity, is nontoxic, has a long life, can utilize visible light as it is for photocatalytic reactions, and is useful especially for hydrogen generation; and a process for producing the same. The photocatalyst comprises cadmium sulfide, has a capsule structure, wherein platinum is supported thereto. It can be obtainable by bubbling H2S gas into a liquid to which particles of cadmium oxide have been added.
    Type: Grant
    Filed: August 23, 2002
    Date of Patent: April 27, 2010
    Assignees: Nittetsu Mining Co., Ltd., Japan Sience and Technology Agency
    Inventors: Kazuyuki Tohji, Akira Kishimoto, Takafumi Atarashi
  • Publication number: 20090301860
    Abstract: An apparatus for exciting a gas, comprising at least a pair of electrodes connecting to an alternating current source in a housing having an inlet opening for a gas to be treated and an outlet opening for a gas which has been treated, characterized in that one electrode of the pair of the electrodes is a suspended electrode arranged by placing it under a tension at a predetermined position in the housing, the other electrode of the pair of the electrodes is a buried electrode arranged at a predetermined position by being buried in the holding wall of the housing at the end thereof, an electrode portion of the buried electrode contains a linear or planar discharging portion as a whole, and the electrode portion of the suspended electrode, opposed to the electrode portion of the buried electrode, has discharging portions where a distance from the electrode portion of the buried electrode becomes cyclically short.
    Type: Application
    Filed: May 31, 2006
    Publication date: December 10, 2009
    Applicant: NITTETSU MINING CO., LTD.
    Inventors: Akemitsu Iida, Takayuki Kawakita
  • Patent number: 7608557
    Abstract: Provided are a photocatalyst which is high in catalytic activity, is nontoxic, has a long life, allows visible light to be used directly for its photocatalytic reaction and is especially useful for hydrogen generation, and a process for producing it. It contains a cadmium compound, has a capsular structure, has an average particle diameter of 100 nm or less and can be manufactured by dropping a solution of a cadmium salt into a solution of a sodium compound or admixing a solution of a sodium compound in a suspension of particles of a cadmium compound.
    Type: Grant
    Filed: June 5, 2003
    Date of Patent: October 27, 2009
    Assignee: Nittetsu Mining Co., Ltd.
    Inventors: Kazuyuki Tohji, Akira Kishimoto, Takafumi Atarashi
  • Patent number: 7566499
    Abstract: Optically coherent multilayered film-coated powder having weather resistance and a clear intended color, and processes for designing and producing the same are provided. A substance of the base particles providing an intended function and an intended color are selected; a spectral intensity curve and values in CIELAB color system of the intended color are measured; and with substances capable of being used as the coated layers and refractive indexes thereof being included in factors, substances and thicknesses of the coated layers and an order of formation of the layers are obtained that provide optically coherent multilayered film-coated powder having such values in CIELAB color system that minimizes a color difference and makes a hue ratio proximate to 1, by solving numerical solutions of the recurring formula for film multiple coherence.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: July 28, 2009
    Assignees: Nittetsu Mining Co., Ltd.
    Inventors: Akira Kishimoto, Takafumi Atarashi, Katsuto Nakatsuka
  • Publication number: 20090178915
    Abstract: An apparatus for exciting a gas, comprising at least one pair of electrodes connecting with an alternate current electric source in a housing having an inlet opening for the gas to be treated and an outlet opening for a treated gas, the pair being a combination of a protected electrode and a protected electrode, or a combination of a protected electrode and an exposed electrode, wherein at least one protected electrode is composed of a core electrode with an insulating coating layer carried thereon and covering an entire surface thereof is disclosed.
    Type: Application
    Filed: September 27, 2005
    Publication date: July 16, 2009
    Applicant: NITTETSU MINING CO., LTD.
    Inventors: Hitoshi Otaka, Takayuki Kawakita
  • Publication number: 20080245655
    Abstract: A technique is provided which enables highly efficient hydrogen sulfide decomposition and hydrogen generation with a photocatalyst. It is a method of treating hydrogen sulfide or producing hydrogen which comprises disposing a liquid tank having a photocatalyst electrode 1 comprising a photocatalyst and a liquid tank having a metal electrode 2 so that the two liquid tanks are separated from each other by a cation-exchange membrane 3, placing a liquid containing either hydrogen sulfide or an organic substance in the liquid tank having the photocatalyst electrode 3, electrically connecting the photocatalyst electrode 3 to the metal electrode 2, and exposing the photocatalyst to a light. The liquid to be placed in the liquid tank having the metal electrode 2 preferably is an acidic solution. The photocatalyst preferably comprises a metal sulfide, and preferably is fine particles having a layered nanocapsule structure.
    Type: Application
    Filed: March 29, 2006
    Publication date: October 9, 2008
    Applicants: NITTETSU MINING CO., LTD., TOHOKU UNIVERSITY
    Inventors: Hiromichi Matsumoto, Akira Kishimoto, Kazuyuki Tohji
  • Patent number: 7399333
    Abstract: The present invention provides a filter element and a method for producing the same, which do not generate pollution during waste disposal, can be easily produced, improve the pressure loss and reduce the production cost. The filter element and the method for producing the same are characterized in that ultrahigh molecular weight polyethylene fine powders, which have an average molecular weight of 3,000,000 to 11,000,000 and a bulk specific gravity of 0.15 to 0.29, are the aggregate of primary particles, and are shaped to have voids of 1 to 5 ?m in a part where the primary particles are connected, are filled into the pores on the surface of a filter element base made of an open-cell porous molded body prepared by heating and sintering synthetic resin powders, a non-woven fabric or a felt.
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: July 15, 2008
    Assignee: Nittetsu Mining Co., Ltd.
    Inventors: Setsuo Agawa, Koji Nakanishi, Yoshinori Ichihara
  • Patent number: 7399522
    Abstract: A subject for the invention is to provide a low-cost heat-resistant filter element produced from polyethylene particles which is for use in separating and collecting particles from a dust gas, can be continuously used even in a high-temperature environment of about from 70° C. to 130° C., especially from 90° C. to 110° C., is excellent in chemical resistance, and has flexibility and excellent suitability for mass production. Another subject is to provide processes by which the heat-resistant filter element can be produced at a reduced equipment cost while taking care of the environment. In the invention, a coating layer of a fluororesin was formed on a surface of a permeable porous molding obtained from particles of a resin composition containing a polyethylene as a main component of a resin ingredient and from 0.1 to 3 parts by weight of an antioxidant per 100 parts by weight of the resin ingredient by fusion-bonding the particles to one another at the surface thereof.
    Type: Grant
    Filed: October 28, 2002
    Date of Patent: July 15, 2008
    Assignee: Nittetsu Mining Co., Ltd.
    Inventors: Koji Nakanishi, Takeshi Hazeyama
  • Patent number: 7347979
    Abstract: A method for treating a gas characterized in that a low temperature plasma is generated in the presence of a metallic oxide oxidation catalyst, and an apparatus for treating a gas characterized by containing a low temperature plasma-generating unit carrying a metallic oxide oxidation catalyst are disclosed. According to the treating method and the treating apparatus, harmful components (such as carbon monoxide or a volatile organic compound) in a gas to be treated can be efficiently oxidized and rendered harmless, a foul odor may be rendered odorless, and further, microorganisms may be removed from and reduced in the treated gas.
    Type: Grant
    Filed: March 30, 2004
    Date of Patent: March 25, 2008
    Assignee: Nittetsu Mining Co., Ltd.
    Inventors: Akemitsu Iida, Akira Mizuno
  • Patent number: 7169443
    Abstract: A titania film-coated powder comprising a base particle having provided thereon at least one titania film, wherein the base particle is coated with the titania film by suspending the base particle in a buffer solution having a pH of from 7.0 to 12.0 to obtain a suspension, and adding a hydrogen peroxide-ammonia mixture solution containing peroxotitanic acid to the suspension to thereby regulate a titania deposition reaction induced by decomposition of the peroxotitanic acid in the suspension.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: January 30, 2007
    Assignees: Nittetsu Mining Co., Ltd.
    Inventors: Akira Kishimoto, Takafumi Atarashi, Katsuto Nakatsuka
  • Patent number: 7060127
    Abstract: Silica-calcium carbonate composition particles having the characteristics of both synthetic silica and calcium carbonate are described along with paper having the particles internally filled therein and a method for making the particles. In the carbonation reaction, which typically involves a step of forming calcium carbonate, while agitating a calcium hydroxide slurry, a mixed gas of carbon dioxide and air is introduced thereinto and synthetic silica, such as colloidal silica or the like, is added before the carbonation rate arrives at 95% but after commencement of the carbonation reaction, followed by further introduction of the mixed gas to continue the carbonation reaction and completion of the carbonation reaction at the time when the pH of the slurry reaches 7, thereby providing the composite particles.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: June 13, 2006
    Assignee: Nittetsu Mining Co., Ltd.
    Inventors: Katsuyuki Tanabe, Kouhei Mitsuhashi