Patents by Inventor Namil Um

Namil Um 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).

  • Publication number: 20240189831
    Abstract: Disclosed is a pretreatment method for utilization of coal pond ash (coal ash buried in ash ponds near coal-fired power plants), and more specifically a treatment method of coal pond ash capable of utilizing coal ash with high efficiency through simple separation processes including screening, float-sink, flotation, grinding, and magnetic separation.
    Type: Application
    Filed: March 7, 2022
    Publication date: June 13, 2024
    Inventors: Namil UM, Young Yeul KANG, Cheol Woo YOON, Soo Yeon HONG, Na Hyeon CHO, Min-Jung KIM, Ja-Hyung CHOI, Tae Wan JEON, Young Sam YOON
  • Patent number: 10738369
    Abstract: The present invention relates to a method of separating rare earth elements from rare earth polishing powder waste by a hydrometallurgical process, the method comprising the steps of: synthesizing sodium rare-earth double sulfates by adding sulfuric acid and sodium hydroxide to the rare earth polishing powder waste; converting the sodium rare-earth double sulfates into rare earth hydroxides; and separating cerium (Ce), lanthanum (La), praseodymium (Pr), and neodymium (Nd) from the rare earth hydroxides by adding hydrochloric acid and sulfuric acid. The present invention makes it possible to recover 99% or more of rare earth elements, including cerium (Ce), lanthanum (La), praseodymium (Pr), and neodymium (Nd) from rare earth polishing powder waste, and enables the recovered rare earth elements to be recycled, thereby achieving great industrial economic benefits.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: August 11, 2020
    Assignee: NATIONAL INSTITUTE OF ENVIRONMENTAL RESEARCH
    Inventors: Namil Um, Mi-Jeong Jeong, Young Yeul Kang, Ki-Heon Kim, Cheol Woo Yoon, Yong Jun Kim, Yoon-A Cho, Byung-Seo Lim, Sun Kyoung Shin, YoungKee Lee
  • Publication number: 20180195146
    Abstract: The present invention relates to a method of separating rare earth elements from rare earth polishing powder waste by a hydrometallurgical process, the method comprising the steps of: synthesizing sodium rare-earth double sulfates by adding sulfuric acid and sodium hydroxide to the rare earth polishing powder waste; converting the sodium rare-earth double sulfates into rare earth hydroxides; and separating cerium (Ce), lanthanum (La), praseodymium (Pr), and neodymium (Nd) from the rare earth hydroxides by adding hydrochloric acid and sulfuric acid. The present invention makes it possible to recover 99% or more of rare earth elements, including cerium (Ce), lanthanum (La), praseodymium (Pr), and neodymium (Nd) from rare earth polishing powder waste, and enables the recovered rare earth elements to be recycled, thereby achieving great industrial economic benefits.
    Type: Application
    Filed: November 29, 2017
    Publication date: July 12, 2018
    Inventors: Namil Um, Mi-Jeong Jeong, Young Yeul Kang, Ki-Heon Kim, Cheol Woo Yoon, Yong Jun Kim, Yoon-A Cho, Byung-Seo Lim, Sun Kyoung Shin, YoungKee Lee