Patents by Inventor Minoru Orikasa

Minoru Orikasa 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).

  • Process for treatment of sodium hydroxide waste liquor containing aluminum
    Patent number: 5531906
    Abstract: A process for treating sodium hydroxide waste liquor containing aluminum, comprising the steps of: adding, to aluminum-containing sodium hydroxide waste liquor, at least one of MgO and Mg(OH).sub.2 in an amount of 0.5 to 3 moles with respect to 1 mole of aluminum to cause a reaction at 70.degree. C. or more; and separating and removing a precipitated magnesium-aluminum compound is disclosed. The present invention makes it possible to recover recyclable sodium hydroxide from an aluminum-containing sodium hydroxide waste liquor. Even if the recovering procedure is repeated, no carbonate ions are accumulated. Therefore, it is possible to prevent degradation of the treating solution containing sodium hydroxide. Further, the by-product is a useful compound, and thus, there is no problem in the reprocessing or disposal of the by-product.
    Type: Grant
    Filed: August 1, 1994
    Date of Patent: July 2, 1996
    Assignee: Nittetsu Mining Co., Ltd.
    Inventors: Susumu Takayama, Yasuie Mikami, Nobuyoshi Iyatomi, Minoru Orikasa