Patents by Inventor Mitsuo Abuyima

Mitsuo Abuyima 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 of alkali processing substance containing arsenic
    Patent number: 8147779
    Abstract: To provide a method of generating, with good reproducibility and ease and without complicated operations, scorodite which satisfies the elution standard (in accordance with Notification of No. 13 of Japanese Environment Agency) and which has good filterbility and stability for processing arsenic contained in a non-ferrous smelting intermediate, particularly, for processing a diarsenic trioxide form. A method of processing diarsenic trioxide, including: a leaching step of adding water and alkali to a non-ferrous smelting intermediate that contains diarsenic trioxide to produce slurry, heating the slurry, and leaching arsenic; a solution adjusting step of adding an oxidizing agent to the leachate to oxidize trivalent arsenic to pentavalent arsenic so as to obtain an adjusted solution; and a crystallizing step of converting arsenic in the adjusted solution to scorodite crystal.
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: April 3, 2012
    Assignee: Dowa Metals & Minning Co., Ltd.
    Inventors: Mitsuo Abuyima, Yusuke Sato, Hironobu Mikami, Masami Oouchi, Tetsuo Fujita, Masayoshi Matsumoto
  • METHOD OF ALKALI PROCESSING SUBSTANCE CONTAINING ARSENIC
    Publication number: 20100215570
    Abstract: To provide a method of generating, with good reproducibility and ease and without complicated operations, scorodite which satisfies the elution standard (in accordance with Notification of No. 13 of Japanese Environment Agency) and which has good filterbility and stability for processing arsenic contained in a non-ferrous smelting intermediate, particularly, for processing a diarsenic trioxide form. A method of processing diarsenic trioxide, including: a leaching step of adding water and alkali to a non-ferrous smelting intermediate that contains diarsenic trioxide to produce slurry, heating the slurry, and leaching arsenic; a solution adjusting step of adding an oxidizing agent to the leachate to oxidize trivalent arsenic to pentavalent arsenic so as to obtain an adjusted solution; and a crystallizing step of converting arsenic in the adjusted solution to scorodite crystal.
    Type: Application
    Filed: July 11, 2008
    Publication date: August 26, 2010
    Applicant: DOWA METALS & MINING CO., LTD.
    Inventors: Mitsuo Abuyima, Yusuke Sato, Hironobu Mikami, Masami Oouchi, Tetsuo Fujita, Masayoshi Matsumoto