Patents by Inventor Kyeong Woo Chung

Kyeong Woo Chung 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).

  • Patent number: 10190192
    Abstract: The present invention relates to a method of recovering acid and a platinum group metal from a leaching solution of a spent catalyst, more particularly, to a method of recovering acid and a platinum group metal from a leaching solution of a spent catalyst, the method including: filtering a leaching solution of a spent catalyst, providing the filtered leaching solution into a concentration chamber, and heating the filtered leaching solution to recover acid included in the leaching solution; providing a concentrated solution of the leaching solution into a substitution chamber after recovering the acid, and adding a metal for a substitution reaction; and cleaning a solid, which is separated by solid-liquid separation after the substitution reaction, with acid and recovering the platinum group metal.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: January 29, 2019
    Assignee: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES
    Inventors: Jin-Young Lee, Kyeong-Woo Chung
  • Patent number: 9771632
    Abstract: The present disclosure provides a method for adsorption/desorption of lithium ions from brine, which employs a counter current decantation process in adsorption/desorption of lithium ions, thereby achieving an adsorption rate of 65±5% and a desorption rate of 95±3%. The method includes supplying brine into one of a plurality of adsorption reactors, adsorbing lithium ions to an adsorbent by supplying the adsorbent to the adsorption reactor to which the brine is supplied and forcing the brine and the adsorbent to sequentially flow backwards inside the respective adsorption reactors, and desorbing the lithium ions from the brine by forcing the adsorbent to which the lithium ions are adsorbed to sequentially flow backwards inside a plurality of desorption reactors. Here, the brine and the adsorbent are stirred by a stirrer to maintain the adsorbent in an intermediate state instead of settling or floating inside the respective adsorption reactors.
    Type: Grant
    Filed: October 12, 2011
    Date of Patent: September 26, 2017
    Assignee: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES
    Inventors: Joon-Soo Kim, Jin-Young Lee, Kyeong-Woo Chung, Hoo-In Lee
  • Patent number: 9458525
    Abstract: Disclosed is a method of recovering a rare earth element from oxidized scrap of permanent magnet. The method includes leaching an oxidized scrap of a permanent magnet from a sulfuric acid solution, and recovering the rare earth element after precipitating the rare earth element contained in the oxidized scrap of the permanent magnet by adding sodium sulfate into the sulfuric acid solution.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: October 4, 2016
    Assignee: Korea Institute of Geoscience and Mineral Resources
    Inventors: Ho-Sung Yoon, Chul-Joo Kim, Kyeong-Woo Chung
  • Patent number: 9425450
    Abstract: A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MNx), a metal/metal nitride layer (M/MNx), a metal carbide layer (MCy), and a metal boride layer (MBz) (where 0.5?x?1, 0.42?y?1, 0.5?z?2).
    Type: Grant
    Filed: April 30, 2015
    Date of Patent: August 23, 2016
    Assignee: HYUNDAI STEEL COMPANY
    Inventors: Yoo Taek Jeon, Kyeong Woo Chung
  • Patent number: 9337496
    Abstract: A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MNx), a metal/metal nitride layer (M/MNx), a metal carbide layer (MCy), and a metal boride layer (MB) (where 0.5?x?1, 0.42?y?1, 0.5?z?2).
    Type: Grant
    Filed: April 30, 2015
    Date of Patent: May 10, 2016
    Assignee: HYUNDAI STEEL COMPANY
    Inventors: Yoo Taek Jeon, Kyeong Woo Chung
  • Patent number: 9337495
    Abstract: A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MNx), a metal/metal nitride layer (M/MNx), a metal carbide layer (MCy), and a metal boride layer (MBz) (where 0.5?x?1, 0.42?y?1, 0.5?z?2).
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: May 10, 2016
    Assignee: HYUNDAI STEEL COMPANY
    Inventors: Yoo Taek Jeon, Kyeong Woo Chung
  • Patent number: 9331343
    Abstract: A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MNx), a metal/metal nitride layer (M/MNx), a metal carbide layer (MCy), and a metal boride layer (MBz) (where 0.5?x?1, 0.42?y?1, 0.5?z?2).
    Type: Grant
    Filed: April 30, 2015
    Date of Patent: May 3, 2016
    Assignee: HYUNDAI STEEL COMPANY
    Inventors: Yoo Taek Jeon, Kyeong Woo Chung
  • Publication number: 20160102384
    Abstract: The present invention relates to a method of recovering acid and a platinum group metal from a leaching solution of a spent catalyst, more particularly, to a method of recovering acid and a platinum group metal from a leaching solution of a spent catalyst, the method including: filtering a leaching solution of a spent catalyst, providing the filtered leaching solution into a concentration chamber, and heating the filtered leaching solution to recover acid included in the leaching solution; providing a concentrated solution of the leaching solution into a substitution chamber after recovering the acid, and adding a metal for a substitution reaction; and cleaning a solid, which is separated by solid-liquid separation after the substitution reaction, with acid and recovering the platinum group metal.
    Type: Application
    Filed: April 28, 2014
    Publication date: April 14, 2016
    Applicant: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES
    Inventors: Jin-Young LEE, Kyeong-Woo CHUNG
  • Publication number: 20150236357
    Abstract: A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MNx), a metal/metal nitride layer (M/MNx), a metal carbide layer (MCy), and a metal boride layer (MB) (where 0.5?x?1, 0.42?y?1, 0.5?z?2).
    Type: Application
    Filed: April 30, 2015
    Publication date: August 20, 2015
    Inventors: Yoo Taek JEON, Kyeong Woo CHUNG
  • Publication number: 20150236319
    Abstract: A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MNx), a metal/metal nitride layer (M/MNx), a metal carbide layer (MCy), and a metal boride layer (MBz) (where 0.5?x?1, 0.42?y?1, 0.5?z?2).
    Type: Application
    Filed: April 30, 2015
    Publication date: August 20, 2015
    Inventors: Yoo Taek JEON, Kyeong Woo CHUNG
  • Publication number: 20150236356
    Abstract: A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MNx), a metal/metal nitride layer (M/MNx), a metal carbide layer (MCy), and a metal boride layer (MBz) (where 0.5?x?1, 0.42?y?1, 0.5?z?2).
    Type: Application
    Filed: April 30, 2015
    Publication date: August 20, 2015
    Inventors: Yoo Taek JEON, Kyeong Woo CHUNG
  • Patent number: 9070907
    Abstract: A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MNx), a metal/metal nitride layer (M/MNx), a metal carbide layer (MCy), and a metal boride layer (MBz) (where 0.5?x?1, 0.42?y?1, 0.5?z?2).
    Type: Grant
    Filed: April 17, 2009
    Date of Patent: June 30, 2015
    Assignee: HYUNDAI HYSCO
    Inventors: Yoo Taek Jeon, Kyeong Woo Chung
  • Publication number: 20150122667
    Abstract: Disclosed is a method of leaching molybdenum (Mo) from the sulfide mineral containing molybdenum (Mo) and copper (Cu) through the electrolytic oxidation scheme. The method includes dipping the sulfide mineral containing the molybdenum (Mo) and the copper (Cu) into a solution having chloride dissolved therein, loading an electrode into the solution, and then applying a current to the solution.
    Type: Application
    Filed: November 26, 2013
    Publication date: May 7, 2015
    Applicant: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES
    Inventors: Kyeong-Woo CHUNG, Hyung-Kyu PARK, Ho-Sung YOON, Chul-Joo KIM, Shun-Myung SHIN
  • Publication number: 20150122084
    Abstract: Disclosed is a method of recovering a rare earth element from oxidized scrap of permanent magnet. The method includes leaching an oxidized scrap of a permanent magnet from a sulfuric acid solution, and recovering the rare earth element after precipitating the rare earth element contained in the oxidized scrap of the permanent magnet by adding sodium sulfate into the sulfuric acid solution.
    Type: Application
    Filed: May 23, 2014
    Publication date: May 7, 2015
    Applicant: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES
    Inventors: Ho-Sung YOON, Chul-Joo KIM, Kyeong-Woo CHUNG
  • Publication number: 20140370415
    Abstract: A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MNx), a metal/metal nitride layer (M/MNx), a metal carbide layer (MCy), and a metal boride layer (MBz) (where 0.5?x?1, 0.42?y?1, 0.5?z?2).
    Type: Application
    Filed: August 28, 2014
    Publication date: December 18, 2014
    Inventors: Yoo Taek JEON, Kyeong Woo CHUNG
  • Publication number: 20140353164
    Abstract: Disclosed are a device for electrowinning europium and a method thereof. The device for electrowinning europium using a channeled cell including a cathode cell includes a channel having an inlet and an outlet; an anode cell including a channel having an inlet and an outlet; and an ion-exchange membrane tightly interposed between the cathode and anode cells, wherein reduced europium is exhausted from the outlet of the cathode cell.
    Type: Application
    Filed: December 16, 2013
    Publication date: December 4, 2014
    Applicant: Korea Institute of Geoscience and Mineral Resources
    Inventors: Kyeong-Woo Chung, Jin-Young Lee, Sung-Don Kim
  • Patent number: 8679428
    Abstract: The present disclosure provides a method of preparing highly pure lithium carbonate from brine. The method includes adding an adsorbent to the brine, from which the magnesium ions Mg2+ have been removed, to adsorb lithium ions Li+ to the adsorbent, followed by providing the adsorbent having the lithium ions Li+ adsorbed thereto to a strong acid solution to desorb the lithium ions Li+ from the adsorbent; enriching the strong acid solution in which the lithium ions Li+ are desorbed from the adsorbent; and obtaining lithium carbonate Li2CO3 through chemical reaction between the lithium ions Li+ in the enriched solution and a carbonate precursor.
    Type: Grant
    Filed: October 12, 2011
    Date of Patent: March 25, 2014
    Assignee: Korea Institute of Geosciences and Mineral Resources (KIGAM)
    Inventors: Joon-Soo Kim, Kyeong-Woo Chung, Jin-Young Lee, Sung-Don Kim
  • Patent number: 8524050
    Abstract: Disclosed herein is a method of manufacturing a stainless steel separator for a fuel cell. The stainless steel separator includes a stainless steel sheet, a first coating layer comprising metal/metal nitride films (M/MNx) (0.5?x?1) on a surface of the stainless steel sheet, and a second coating layer comprising a metal oxynitride film (MOyNz) (0.05?y?2, 0.25?z?1.0).
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: September 3, 2013
    Assignee: Hyundai Hysco
    Inventors: Yoo Taek Jeon, Kyeong Woo Chung, Hyun Sik Myung, Yong Sik Yun, Jong In Park, Eun Young Kim
  • Patent number: 8475746
    Abstract: Disclosed herein is a uranium ion exchange adsorption method using ultrasound. The method includes placing a slurry obtained by mixing uranium ions, sulfuric acid and an ion exchange resin into a reaction bath, and stirring the slurry in the reaction bath while simultaneously applying ultrasound to the reaction bath to allow the uranium ions to be adsorbed to the ion exchange resin through ion exchange adsorption. The method has an improved ion exchange adsorption rate of the uranium ions.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: July 2, 2013
    Assignee: Korea Institute of Geoscience and Mineral Resources
    Inventors: Kyeong-Woo Chung, Chul-Joo Kim, Ho-Sung Yoon
  • Patent number: 8470269
    Abstract: A highly efficient uranium leaching method using ultrasound is disclosed. The uranium leaching method includes preparing black slate powder containing uranium by pulverizing black slate containing uranium, placing the black slate powder and water in a reaction bath, and performing uranium leaching by adding and mixing sulfuric acid and an oxidant with the black slate powder and water to prepare a mixture in the reaction bath while applying ultrasound to the reaction bath. In this method, uranium leaching efficiency can be maximized by adding sulfuric acid to the uranium ore while applying ultrasound thereto.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: June 25, 2013
    Assignee: Korea Institute of Geoscience and Mineral Resources
    Inventors: Kyeong-Woo Chung, Chul-Joo Kim, Ho-Sung Yoon