Patents by Inventor Keita KAMIYAMA

Keita KAMIYAMA 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).

  • Method for producing lithium carbonate
    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
  • METHOD FOR PRODUCING LITHIUM CARBONATE
    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