Patents by Inventor Niko METSÄMUURONEN

Niko METSÄMUURONEN 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 treating fly ash of a recovery boiler
    Patent number: 11725341
    Abstract: A method of treating fly ash containing sodium sulfate from a recovery boiler of a chemical pulp mill. This method includes at least the following steps: a) ash is dissolved in an aqueous solution and the pH of the solution is adjusted with alkali for precipitating impurities, b) the solution is filtered for removing the impurities containing precipitate, c) sodium sulfate is crystallized from the solution and the crystals are separated from the solution by filtering or by centrifugation, and d) the crystallized sodium sulfate is used as initial material for producing sodium and sulfur containing chemicals or as process chemical.
    Type: Grant
    Filed: April 26, 2018
    Date of Patent: August 15, 2023
    Assignee: Andritz Oy
    Inventors: Keijo Salmenoja, Niko Metsämuuronen, Marjukka Joutsimo, Ismo Reilama
  • METHOD OF TREATING FLY ASH OF A RECOVERY BOILER
    Publication number: 20200181841
    Abstract: A method of treating fly ash containing sodium sulfate from a recovery boiler of a chemical pulp mill. This method includes at least the following steps: a) ash is dissolved in an aqueous solution and the pH of the solution is adjusted with alkali for precipitating impurities, b) the solution is filtered for removing the impurities containing precipitate, c) sodium sulfate is crystallized from the solution and the crystals are separated from the solution by filtering or by centrifugation, and d) the crystallized sodium sulfate is used as initial material for producing sodium and sulfur containing chemicals or as process chemical.
    Type: Application
    Filed: April 26, 2018
    Publication date: June 11, 2020
    Inventors: Keijo SALMENOJA, Niko METSÄMUURONEN, Marjukka JOUTSIMO, Ismo REILAMA