Patents by Inventor Wenqi Luan

Wenqi Luan 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 AND APPARATUS FOR PRESSURIZED CALCINATION OF GYPSUM
    Publication number: 20090257946
    Abstract: A method for calcining gypsum in a pressurized reactor by injecting combustion gases and air into the pressurized reactor to create a fluidized bed of gypsum, and heating the fluidized bed of gypsum in the pressurized reactor sufficiently to form a calcined hemihydrate.
    Type: Application
    Filed: February 19, 2009
    Publication date: October 15, 2009
    Inventors: Wenqi Luan, Qingxia Liu
  • Activated carbon as mercury release control agent in gypsum calcination
    Patent number: 7507287
    Abstract: A method for providing effective mercury release control during gypsum calcination is disclosed. The method comprises providing a reactor and gypsum containing mercury; providing a mercury sorbent, such as activated carbon and/or derivatives thereof in the reactor; and calcining the gypsum in the reactor to form stucco. The mercury contaminant present in the gypsum is sorbed by the mercury sorbent during the calcination process. The mercury content of the stucco is substantially similar in amount to the mercury content of the uncalcined gypsum.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: March 24, 2009
    Assignee: United States Gypsum Company
    Inventor: Wenqi Luan