Patents by Inventor Zexian Song

Zexian Song 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 of extracting Te and bismuth oxide and recovering byproducts
    Patent number: 8277772
    Abstract: A method of extracting Te and bismuth oxide and recovering byproduct comprises: leaching raw materials with a Te content of ?1.8% by utilizing a leaching system containing H2SO4, Cl?, Br?, NH4+ and NaClO3, reducing leach solution with SO2 gas by precipitation method after separating impurities from it, washing with concentrated hydrochloric acid to obtain tellurium precipitation (18), purifying to obtain Te with a purity of higher than 99.99%. The filtrate produced is used for extracting Bi2O3 with a purity of higher than 99.99% when Bi content in the raw material is ?2%. Acidic waste solution produced during the process could be returned to the leaching step for recycle.
    Type: Grant
    Filed: June 2, 2009
    Date of Patent: October 2, 2012
    Inventors: Jun Wang, Xiuzhen Wang, Zexian Song
  • Method of Extracting Te and Bismuth Oxide and Recovering Byproducts
    Publication number: 20110076208
    Abstract: A method of extracting Te and bismuth oxide and recovering byproduct comprises: leaching raw materials with a Te content of ?1.8% by utilizing a leaching system containing H2SO4, Cl?, Br?, NH4+ and NaClO3, reducing leach solution with SO2 gas by precipitation method after separating impurities from it, washing with concentrated hydrochloric acid to obtain tellurium precipitation (18), purifying to obtain Te with a purity of higher than 99.99%. The filtrate produced is used for extracting Bi2O3 with a purity of higher than 99.99% when Bi content in the raw material is ?2%. Acidic waste solution produced during the process could be returned to the leaching step for recycle.
    Type: Application
    Filed: June 2, 2009
    Publication date: March 31, 2011
    Inventors: Jun Wang, Xiuzhen Wang, Zexian Song