Patents by Inventor Shuji Kuramochi

Shuji Kuramochi 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).

  • Patent number: 5824282
    Abstract: Metal impurities such as mercury, copper, lead, zinc, iron and cadmium that are contained in trace amounts in sulfur that have been recovered from zinc concentrates by direct pressure leaching or other hydrometallurgical processes are removed effectively by contacting the molten sulfur, as it is held at a temperature not lower than the melting point of sulfur, with activated alumina by passage through a packed layer of activated alumina or a filter coated with activated alumina, or by mixing with activated alumina under stirring or by passage through a fluidized layer of activated alumina. The method is capable of reducing the sum of metal impurities in the sulfur to 50 ppm or below, with contents of mercury being reduced to 1 ppm or less, to provide sulfur having a purity of at least 99.99%, which is advantageous for use as a raw material in the production of sulfuric acid and in other chemical processes.
    Type: Grant
    Filed: March 12, 1997
    Date of Patent: October 20, 1998
    Assignee: Akita Zinc Co., Ltd.
    Inventors: Hideki Nagata, Shuji Kuramochi, Norihito Ishimori
  • Patent number: 5656251
    Abstract: Mercury in trace amounts in sulfur that has been recovered from zinc concentrates by direct pressure leaching or other hydrometallurgical processes can be removed effectively by bringing the molten sulfur, as it is held at a temperature not lower than the melting point of sulfur, into contact with activated alumina by passage through a packed layer of activated alumina or a filter coated with activated alumina, or by mixing with activated alumina under stirring or by passage through a fluidized layer of activated alumina. The method is capable of reducing the mercury content to 1 ppm or less, whereby sulfur having a purity of at least 99.99% that is advantageous for use as a raw material in the production of sulfuric acid and in other industries is manufactured at low cost on simple equipment.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: August 12, 1997
    Assignee: Akita Zinc Col., Ltd.
    Inventors: Hideki Nagata, Shuji Kuramochi, Norihito Ishimori