Patents by Inventor Marja Riekkola-Vanhanen

Marja Riekkola-Vanhanen 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 precipation of silica in connection with zinc ore leaching
    Patent number: 7615100
    Abstract: The invention relates to a method for the leaching of oxidized ores and in particular zinc ores. The ore, wherein the valuable metals are at least partially in silicate form, are routed to an acidic leaching stage in conditions where the silicate decomposes and the valuable metal ion comes into the solution. During leaching the silicate ion first dissolves, but simultaneously decomposes and is precipitated as silica.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: November 10, 2009
    Assignee: Outotec Oyj
    Inventors: Sigmund Fugleberg, Pertti Pekkala, Panu Talonen, Marja Riekkola-Vanhanen
  • Method for Leaching Metal Sulphide Minerals
    Publication number: 20080241024
    Abstract: The invention relates to a method for the sulphate-based leaching of metal sulphide minerals, such as chalcopyrite, CuFeS2, containing ore in atmospheric conditions. It is beneficial for the leaching of metal sulphides that the sulphide to be leached is treated before leaching or at the beginning of leaching with a sulphide salt that is more noble than the sulphide or the components it includes.
    Type: Application
    Filed: September 26, 2006
    Publication date: October 2, 2008
    Applicant: OUTOTEC OYJ
    Inventors: Marja Riekkola-Vanhanen, Seppo Heimala
  • Method for the precipation of silica in connection with zinc ore leaching
    Publication number: 20040074340
    Abstract: The invention relates to a method for the leaching of oxidized ores and in particular zinc ores. The ore, wherein the valuable metals are at least partially in silicate form, are routed to an acidic leaching stage in conditions where the silicate decomposes and the valuable metal ion comes into the solution. During leaching the silicate ion first dissolves, but simultaneously decomposes and is precipitated as silica.
    Type: Application
    Filed: September 10, 2003
    Publication date: April 22, 2004
    Inventors: Sigmund Fugleberg, Pertti Pekkala, Panu Talonen, Marja Riekkola-Vanhanen