Patents by Inventor Toshiyuki Yamaoka

Toshiyuki Yamaoka 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 separating and recovering nickel and lithium
    Patent number: 8444744
    Abstract: A method for extracting nickel and lithium includes solvent extraction step of using three or more extraction stages to subject a solution containing lithium and nickel to solvent extraction with 2-Ethylhexyl phosphonic acid mono-2-ethylhexyl ester at a pH of 8.0 to 8.5, whereby the nickel and the lithium are co-extracted into a resultant organic phase.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: May 21, 2013
    Assignee: JX Nippon Mining & Metals Corporation
    Inventors: Makoto Narisako, Toshiyuki Yamaoka, Daisuke Kobayashi, Naoki Higuchi
  • Preparation method of lithium carbonate from lithium-ion secondary battery recovered material
    Patent number: 8298502
    Abstract: A preparation method of lithium carbonate, in recovering valuable resources of a lithium-ion battery, reducing impurities from lithium carbonate, having a pretreatment process, comprising: a first step cleaning an organic phase containing nickel and lithium prepared by a solvent extraction by use of a sulfuric acid solution containing nickel and enriching lithium in the cleaning solution; a second step extracting a residual nickel only by an organic solvent from a post-cleaning solution in which the lithium is enriched; and a third step controlling pH of the post-extraction solution containing the lithium by ammonia water or lithium hydroxide.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: October 30, 2012
    Assignee: JX Nippon Mining & Metals Corporation
    Inventors: Toshiyuki Yamaoka, Naoki Higuchi, Makoto Narisako, Daisuke Kobayashi
  • METHOD FOR SEPARATING AND RECOVERING NICKEL AND LITHIUM
    Publication number: 20110072936
    Abstract: A method for extracting nickel and lithium includes solvent extraction step of using three or more extraction stages to subject a solution containing lithium and nickel to solvent extraction with 2-Ethylhexyl phosphonic acid mono-2-ethylhexyl ester at a pH of 8.0 to 8.5, whereby the nickel and the lithium are co-extracted into a resultant organic phase.
    Type: Application
    Filed: September 9, 2010
    Publication date: March 31, 2011
    Applicant: JX NIPPON MINING & METALS CORPORATION
    Inventors: Makoto Narisako, Toshiyuki Yamaoka, Daisuke Kobayashi, Naoki Higuchi
  • PREPARATION METHOD OF LITHIUM CARBONATE FROM LITHIUM-ION SECONDARY BATTERY RECOVERED MATERIAL
    Publication number: 20110002825
    Abstract: A preparation method of lithium carbonate, in recovering valuable resources of a lithium-ion battery, reducing impurities from lithium carbonate, having a pretreatment process, comprising: a first step cleaning an organic phase containing nickel and lithium prepared by a solvent extraction by use of a sulfuric acid solution containing nickel and enriching lithium in the cleaning solution; a second step extracting a residual nickel only by an organic solvent from a post-cleaning solution in which the lithium is enriched; and a third step controlling pH of the post-extraction solution containing the lithium by ammonia water or lithium hydroxide.
    Type: Application
    Filed: July 2, 2010
    Publication date: January 6, 2011
    Applicant: Nippon Mining & Metals Co., Ltd.
    Inventors: Toshiyuki YAMAOKA, Naoki Higuchi, Makoto Narisako, Daisuke Kobayashi