Patents by Inventor Toshihiko Nagakura

Toshihiko Nagakura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210292927
    Abstract: A method for refining bismuth is provided, which comprises recovering bismuth from a solution obtained after recovery of noble metals from a copper electrolytic slime. The method comprises: 1) a neutralization step of adding alkali to an acid solution to adjust the pH to the range of 2.0 or more and 3.
    Type: Application
    Filed: January 30, 2017
    Publication date: September 23, 2021
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Hiroshi TAKENOUCHI, Nobuyuki KAJI, Toshihiko NAGAKURA, Kenji TAKEDA, Satoshi ASANO
  • Patent number: 10190189
    Abstract: The purpose of the present invention is to recover roughly purified scandium, which is purified to an extent acceptable for a technique for highly purifying scandium, efficiently and without any complicated operation from a neutralization sediment (drainage sediment) generated in neutralizing acid mine drainage which contains a sulfur component. This scandium recovery process includes a washing step (S1) for washing a neutralization sediment (drainage sediment) and a dissolution step (S2) for subjecting the washed sediment obtained in the washing step (S1) to dissolution in an acid. It is preferable that the process further includes a re-dissolution step (S3) for subjecting a dissolution residue which remains after the dissolution in the dissolution step (S2) to dissolution with an acid. In the washing step (S1), the neutralization sediment is washed with a washing liquid until the pH of the post-washing liquid generated in the washing step becomes 6 or higher.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: January 29, 2019
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Toshihiko Nagakura, Yoshitomo Ozaki, Hidemasa Nagai, Tatsuya Higaki
  • Patent number: 9963762
    Abstract: In order to recover high-quality scandium from nickel oxide ores efficiently, this method comprises: a step (S1) for feeding Ni oxide ores and sulfuric acid into a pressure vessel, and subjecting the mixture to solid-liquid separation to form a leachate and a leach residue; a step (S2) for adding a neutralizing agent to the leachate, and thus forming a neutralization sediment and a post-neutralization fluid; a step (S3) for adding a sulfurizing agent to the post-neutralization fluid, and separating the obtained mixture into Ni sulfide and a post-sulfurization fluid; a step (S4) for bringing the post-sulfurization fluid into contact with a chelating resin, making Sc adsorbed on the chelating resin, and forming an Sc eluent; a step (S6) for bringing the Sc eluent into contact with an extracting agent, adding a back-extraction agent to the extract, and forming back-extracted matter; and a step (S8) for roasting the back-extracted matter, and forming Sc oxide.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: May 8, 2018
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Tatsuya Higaki, Yoshitomo Ozaki, Shin-ya Matsumoto, Itsumi Matsuoka, Hidemasa Nagai, Toshihiko Nagakura, Keiji Kudo
  • Publication number: 20170175225
    Abstract: The purpose of the present invention is to recover roughly purified scandium, which is purified to an extent acceptable for a technique for highly purifying scandium, efficiently and without any complicated operation from a neutralization sediment (drainage sediment) generated in neutralizing acid mine drainage which contains a sulfur component. This scandium recovery process includes a washing step (S1) for washing a neutralization sediment (drainage sediment) and a dissolution step (S2) for subjecting the washed sediment obtained in the washing step (S1) to dissolution in an acid. It is preferable that the process further includes a re-dissolution step (S3) for subjecting a dissolution residue which remains after the dissolution in the dissolution step (S2) to dissolution with an acid. In the washing step (S1), the neutralization sediment is washed with a washing liquid until the pH of the post-washing liquid generated in the washing step becomes 6 or higher.
    Type: Application
    Filed: February 18, 2015
    Publication date: June 22, 2017
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Toshihiko Nagakura, Yoshitomo Ozaki, Hidemasa Nagai, Tatsuya Higaki
  • Publication number: 20160340757
    Abstract: In order to recover high-quality scandium from nickel oxide ores efficiently, this method comprises: a step (S1) for feeding Ni oxide ores and sulfuric acid into a pressure vessel, and subjecting the mixture to solid-liquid separation to form a leachate and a leach residue; a step (S2) for adding a neutralizing agent to the leachate, and thus forming a neutralization sediment and a post-neutralization fluid; a step (S3) for adding a sulfurizing agent to the post-neutralization fluid, and separating the obtained mixture into Ni sulfide and a post-sulfurization fluid; a step (S4) for bringing the post-sulfurization fluid into contact with a chelating resin, making Sc adsorbed on the chelating resin, and forming an Sc eluent; a step (S6) for bringing the Sc eluent into contact with an extracting agent, adding a back-extraction agent to the extract, and forming back-extracted matter; and a step (S8) for roasting the back-extracted matter, and forming Sc oxide.
    Type: Application
    Filed: January 21, 2015
    Publication date: November 24, 2016
    Inventors: Tatsuya Higaki, Yoshitomo Ozaki, Shin-ya Matsumoto, Itsumi Matsuoka, Hidemasa Nagai, Toshihiko Nagakura, Keiji Kudo
  • Patent number: 9458526
    Abstract: Provided is a method for efficiently separating nickel, cobalt and/or scandium, and impurities from an acidic solution containing impurities such as manganese, iron, zinc, and aluminum. A valuable-metal extracting agent of the present invention is expressed by general formula (1). In the formula, R1 and R2 each represent the same or different alkyl groups, R3 represents a hydrogen atom or an alkyl group, and R4 represents a hydrogen atom or a given group, other than an amino group, that bonds with an ? carbon as an amino acid. In general formula (1), the inclusion of a glycine unit, a histidine unit, a lysine unit, an asparagine acid unit, or a normal methylglycine unit is preferred.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: October 4, 2016
    Assignees: Kyushu University, National University Corporation, Sumitomo Metal Mining Co., Ltd.
    Inventors: Masahiro Goto, Fukiko Kubota, Yuzo Baba, Yoshitomo Ozaki, Jiro Hayata, Tatsuya Higaki, Toshihiko Nagakura, Shinya Matsumoto
  • Patent number: 9399804
    Abstract: The present invention effectively recover high-grade scandium from nickel oxide ores. The present invention includes a leaching step (S1) for charging nickel oxide ores and sulfuric acid into a pressurized vessel, a neutralizing step (S2) for adding a neutralizing agent to the leachate to obtain a neutralized precipitate and a neutralized liquid, a sulfidizing step (S3) for adding a sulfidizing agent to the neutralized liquid, an ion exchange step (S4) for bringing the sulfidized solution into contact with a chelate resin, a solvent extraction step (S6) for bringing a Sc eluent into contact with an extracting agent, a Sc precipitation Step (S7) for adding a neutralizing agent or oxalic acid to a stripping solution, and a calcination step (S8) for drying and calcining a precipitate to obtain scandium oxide.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: July 26, 2016
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Yoshitomo Ozaki, Toshihiko Nagakura
  • Publication number: 20160047014
    Abstract: The present invention effectively recover high-grade scandium from nickel oxide ores. The present invention includes a leaching step (S1) for charging nickel oxide ores and sulfuric acid into a pressurized vessel, a neutralizing step (S2) for adding a neutralizing agent to the leachate to obtain a neutralized precipitate and a neutralized liquid, a sulfidizing step (S3) for adding a sulfidizing agent to the neutralized liquid, an ion exchange step (S4) for bringing the sulfidized solution into contact with a chelate resin, a solvent extraction step (S6) for bringing a Sc eluent into contact with an extracting agent, a Sc precipitation Step (S7) for adding a neutralizing agent or oxalic acid to a stripping solution, and a calcination step (S8) for drying and calcining a precipitate to obtain scandium oxide.
    Type: Application
    Filed: April 25, 2014
    Publication date: February 18, 2016
    Inventors: Yoshitomo Ozaki, Toshihiko Nagakura
  • Publication number: 20160010177
    Abstract: Provided is a method for efficiently separating nickel, cobalt and/or scandium, and impurities from an acidic solution containing impurities such as manganese, iron, zinc, and aluminum. A valuable-metal extracting agent of the present invention is expressed by general formula (1). In the formula, R1 and R2 each represent the same or different alkyl groups, R3 represents a hydrogen atom or an alkyl group, and R4 represents a hydrogen atom or a given group, other than an amino group, that bonds with an ? carbon as an amino acid. In general formula (1), the inclusion of a glycine unit, a histidine unit, a lysine unit, an asparagine acid unit, or a normal methylglycine unit is preferred.
    Type: Application
    Filed: March 17, 2014
    Publication date: January 14, 2016
    Inventors: Masahiro Goto, Fukiko Kubota, Yuzo Baba, Yoshitomo Ozaki, Jiro Hayata, Tatsuya Higaki, Toshihiko Nagakura, Shinya Matsumoto