Patents by Inventor Jaakko Poijärvi

Jaakko Poijärvi 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 recovery of valuable metals and arsenic from a solution
    Patent number: 7615199
    Abstract: The invention relates to a method for the treatment of material containing at least one valuable metal and arsenic to form a valuable metal-depleted scorodite sediment and a pure aqueous solution to be discharged from the process. According to the method, the valuable metals are first removed from the material to be treated and then arsenic precipitation from the solution is performed in two stages. By means of the method, the aim is to obtain as low a valuable metal content as possible in the scorodite sediment that will be formed. Likewise, the arsenic and valuable metal content of the aqueous solution that is formed during arsenic precipitation also remains so low that the water can be released into the environment.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: November 10, 2009
    Assignee: Outotec Oyj
    Inventors: Jaakko Poijärvi, Raimo Nupponen, Tuula Mäkinen, Jaana Romppanen
  • Method for the production of blister copper in suspension reactor
    Patent number: 6761749
    Abstract: The invention relates to a method of producing blister copper pyrometallurgically in a suspension reactor directly from its sulfidic concentrate. According to the method the copper sulfide concentrate is fed into a suspension reactor, into which cooled and finely ground copper matte is also fed in order to bind the heat released from the concentrate.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: July 13, 2004
    Assignee: Outokumpu Oyj
    Inventors: Jaakko Poijärvi, Tarmo Mäntymäki