Patents by Inventor Xingliang Feng

Xingliang Feng 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 comprehensively recovering rare earth elements and fluorine element in a bastnaesite treatment process
    Patent number: 9752213
    Abstract: A method for comprehensively recovering rare earth elements and fluorine element in a bastnaesite treatment process. The method comprises: oxidation roasting a bastnaesite, and leaching a roasted mixture using a hydrochloric acid, adding a roasting promoter to the bastnaesite during the roasting process; and/or during the leaching process using the hydrochloric acid, adding a catalytic leaching promoter into the mixture, obtaining a rare earth chloride solution containing little cerium element and a cerium-rich residue containing the fluorine element; and separating and recovering rare earth fluorides from the cerium-rich residue.
    Type: Grant
    Filed: September 29, 2013
    Date of Patent: September 5, 2017
    Assignee: GRIREM ADVANCED MATERIALS CO., LTD.
    Inventors: Liangshi Wang, Zhiqi Long, Dali Cui, Xiaowei Huang, Ying Yu, Yang Xu, Xingliang Feng
  • METHOD FOR COMPREHENSIVELY RECOVERING RARE EARTH ELEMENTS AND FLUORINE ELEMENT IN A BASTNAESITE TREATMENT PROCESS
    Publication number: 20150252449
    Abstract: A method for comprehensively recovering rare earth elements and fluorine element in a bastnaesite treatment process. The method comprises: oxidation roasting a bastnaesite, and leaching a roasted mixture using a hydrochloric acid, adding a roasting promoter to the bastnaesite during the roasting process; and/or during the leaching process using the hydrochloric acid, adding a catalytic leaching promoter into the mixture, obtaining a rare earth chloride solution containing little cerium element and a cerium-rich residue containing the fluorine element; and separating and recovering rare earth fluorides from the cerium-rich residue.
    Type: Application
    Filed: September 29, 2013
    Publication date: September 10, 2015
    Inventors: Liangshi Wang, Zhiqi Long, Dali Cui, Xiaowei Huang, Ying Yu, Yang Xu, Xingliang Feng