Patents by Inventor Aija Rytioja

Aija Rytioja 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 the removal of mercury from sulphuric acid with thiosulphate precipitation
    Patent number: 7452521
    Abstract: This invention relates to a method for removing mercury from dilute sulphuric acid. According to the method sulphuric acid solution is scrubbed with an aqueous solution containing thiosulphate, which precipitates the mercury present in the sulphuric acid solution either as mercury sulphide or, in a chlorine-containing environment, as a mercury sulphide-mercury chloride double salt. The quantity of thiosulphate to be fed is adjusted so that it precipitates the mercury in the sulphuric acid solution, but still does not form elemental sulphur.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: November 18, 2008
    Assignee: Outotec OYJ
    Inventors: Dag Berg, Jens Nyberg, Aija Rytioja, Heljä Peltola, Pekka Taskinen
  • Method for the removal of mercury from sulphuric acid with thiosulphate precipitation
    Publication number: 20070053827
    Abstract: This invention relates to a method for removing mercury from dilute sulphuric acid. According to the method sulphuric acid solution is scrubbed with an aqueous solution containing thiosulphate, which precipitates the mercury present in the sulphuric acid solution either as mercury sulphide or, in a chlorine-containing environment, as a mercury sulphide-mercury chloride double salt. The quantity of thiosulphate to be fed is adjusted so that it precipitates the mercury in the sulphuric acid solution, but still does not form elemental sulphur.
    Type: Application
    Filed: July 16, 2004
    Publication date: March 8, 2007
    Applicant: OUTOKUMPU TECHNOLOGY OY
    Inventors: Dag Berg, Jens Nyberg, Aija Rytioja, Helja Peltola, Pekka Taskinen
  • Method for the stabilization of a fluidized bed in a roasting furnace
    Patent number: 6926752
    Abstract: This invention relates to a method for stabilizing a fluidized bed used in roasting by adjusting the oxygen content of the roasting gas in the bed. The fine-grained material for roasting is fed into the furnace above the fluidized bed and the roasting gas, which causes the fluidizing, is fed into the bottom of the furnace through a grate. In this method, the total amount of oxygen in the roasting gas to be fed and the average total oxygen requirement of the material to be roasted are calculated and the ratio between them regulated so that the oxygen coefficient in the bed is over 1.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: August 9, 2005
    Assignee: Outokumpu Oyj
    Inventors: Pekka Taskinen, Maija-Leena Metsärinta, Jens Nyberg, Aija Rytioja
  • Method for the stabilization of a fluidized bed in a roasting furnace
    Publication number: 20040050209
    Abstract: This invention relates to a method for stabilizing a fluidized bed used in roasting by adjusting the oxygen content of the roasting gas in the bed. The fine-grained material for roasting is fed into the furnace above the fluidized bed and the roasting gas, which causes the fluidizing, is fed into the bottom of the furnace through a grate. In this method, the total amount of oxygen in the roasting gas to be fed and the average total oxygen requirement of the material to be roasted are calculated and the ratio between them regulated so that the oxygen coefficient in the bed is over 1.
    Type: Application
    Filed: October 21, 2003
    Publication date: March 18, 2004
    Inventors: Pekka Taskinen, Maija-Leena Metsarinta, Jens Nyberg, Aija Rytioja