Patents by Inventor Bernd Kerstiens

Bernd Kerstiens 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).

  • Process and plant for producing calcine products
    Patent number: 8337801
    Abstract: A process for producing calcine products includes dead roasting a metal sulfide concentrate having a low sulfur content. The concentrate is roasted in a circulating fluidized bed at a temperature of about 950 to 1050° C. A waste gas of the fluidized bed is passed through at least one of a recuperator and a Venturi drier so as to respectively provide at least one of a preheating of at least a portion of air fluidizing the fluidized bed and a drying of at least a portion of the concentrate to be roasted. The calcine product obtained in the fluidized bed with a sulfur content of less than 1 wt-% is provided for further processing.
    Type: Grant
    Filed: July 10, 2009
    Date of Patent: December 25, 2012
    Assignee: Outotec Oyj
    Inventors: Joerg Hammerschmidt, Bernd Kerstiens, Peter Sturm
  • PROCESS AND PLANT FOR PRODUCING CALCINE PRODUCTS
    Publication number: 20110195016
    Abstract: A process for producing calcine products includes dead roasting a metal sulfide concentrate having a low sulfur content. The concentrate is roasted in a circulating fluidized bed at a temperature of about 950 to 1050° C. A waste gas of the fluidized bed is passed through at least one of a recuperator and a Venturi drier so as to respectively provide at least one of a preheating of at least a portion of air fluidizing the fluidized bed and a drying of at least a portion of the concentrate to be roasted. The calcine product obtained in the fluidized bed with a sulfur content of less than 1 wt-% is provided for further processing.
    Type: Application
    Filed: July 10, 2009
    Publication date: August 11, 2011
    Applicant: OUTOTEC OYJ
    Inventors: Joerg Hammerschmidt, Bernd Kerstiens, Peter Sturm