Patents by Inventor Aarno Kalliokoski

Aarno Kalliokoski 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 concentration of spent acid
    Patent number: 6926757
    Abstract: The invention relates to a method for the concentration of the spent acid produced in connection with the scrubbing smelter or roaster gas. The hot gas produced is scrubbed first by dry and then by wet separation, and the scrubbed gas is conducted to the manufacture of a sulfurous end product. The spent acid formed is dilute, and its sulfuric acid content is increased by making use of the thermal capacity of the actual hot gas, which comes from dry separation. Thus, by making use of the thermal capacity of the gas created in the process, it is possible to replace, at least partly, the use of evaporators.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: August 9, 2005
    Assignee: Outokumpu OYJ
    Inventors: Aarno Kalliokoski, Pauli Kuisma
  • Method for the concentration of spent acid
    Publication number: 20040062707
    Abstract: The invention relates to a method for the concentration of the spent acid produced in connection with the scrubbing smelter or roaster gas. The hot gas produced is scrubbed first by dry and then by wet separation, and the scrubbed gas is conducted to the manufacture of a sulfurous end product. The spent acid formed is dilute, and its sulfuric acid content is increased by making use of the thermal capacity of the actual hot gas, which comes from dry separation. Thus, by making use of the thermal capacity of the gas created in the process, it is possible to replace, at least partly, the use of evaporators.
    Type: Application
    Filed: June 19, 2003
    Publication date: April 1, 2004
    Inventors: Aarno Kalliokoski, Pauli Kuisma