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).
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Patent number: 10190192Abstract: 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: GrantFiled: April 28, 2014Date of Patent: January 29, 2019Assignee: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCESInventors: Jin-Young Lee, Kyeong-Woo Chung
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Patent number: 9771632Abstract: 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: GrantFiled: October 12, 2011Date of Patent: September 26, 2017Assignee: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCESInventors: Joon-Soo Kim, Jin-Young Lee, Kyeong-Woo Chung, Hoo-In Lee
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Patent number: 9458525Abstract: 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: GrantFiled: May 23, 2014Date of Patent: October 4, 2016Assignee: Korea Institute of Geoscience and Mineral ResourcesInventors: Ho-Sung Yoon, Chul-Joo Kim, Kyeong-Woo Chung
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Patent number: 9425450Abstract: 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: GrantFiled: April 30, 2015Date of Patent: August 23, 2016Assignee: HYUNDAI STEEL COMPANYInventors: Yoo Taek Jeon, Kyeong Woo Chung
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Patent number: 9337496Abstract: 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: GrantFiled: April 30, 2015Date of Patent: May 10, 2016Assignee: HYUNDAI STEEL COMPANYInventors: Yoo Taek Jeon, Kyeong Woo Chung
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Patent number: 9337495Abstract: 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: GrantFiled: August 28, 2014Date of Patent: May 10, 2016Assignee: HYUNDAI STEEL COMPANYInventors: Yoo Taek Jeon, Kyeong Woo Chung
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Patent number: 9331343Abstract: 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: GrantFiled: April 30, 2015Date of Patent: May 3, 2016Assignee: HYUNDAI STEEL COMPANYInventors: Yoo Taek Jeon, Kyeong Woo Chung
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Publication number: 20160102384Abstract: 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: ApplicationFiled: April 28, 2014Publication date: April 14, 2016Applicant: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCESInventors: Jin-Young LEE, Kyeong-Woo CHUNG
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Publication number: 20150236319Abstract: 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: ApplicationFiled: April 30, 2015Publication date: August 20, 2015Inventors: Yoo Taek JEON, Kyeong Woo CHUNG
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Publication number: 20150236356Abstract: 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: ApplicationFiled: April 30, 2015Publication date: August 20, 2015Inventors: Yoo Taek JEON, Kyeong Woo CHUNG
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Publication number: 20150236357Abstract: 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: ApplicationFiled: April 30, 2015Publication date: August 20, 2015Inventors: Yoo Taek JEON, Kyeong Woo CHUNG
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Patent number: 9070907Abstract: 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: GrantFiled: April 17, 2009Date of Patent: June 30, 2015Assignee: HYUNDAI HYSCOInventors: Yoo Taek Jeon, Kyeong Woo Chung
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Publication number: 20150122084Abstract: 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: ApplicationFiled: May 23, 2014Publication date: May 7, 2015Applicant: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCESInventors: Ho-Sung YOON, Chul-Joo KIM, Kyeong-Woo CHUNG
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Publication number: 20150122667Abstract: 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: ApplicationFiled: November 26, 2013Publication date: May 7, 2015Applicant: KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCESInventors: Kyeong-Woo CHUNG, Hyung-Kyu PARK, Ho-Sung YOON, Chul-Joo KIM, Shun-Myung SHIN
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Publication number: 20140370415Abstract: 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: ApplicationFiled: August 28, 2014Publication date: December 18, 2014Inventors: Yoo Taek JEON, Kyeong Woo CHUNG
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Publication number: 20140353164Abstract: 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: ApplicationFiled: December 16, 2013Publication date: December 4, 2014Applicant: Korea Institute of Geoscience and Mineral ResourcesInventors: Kyeong-Woo Chung, Jin-Young Lee, Sung-Don Kim
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Patent number: 8679428Abstract: 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: GrantFiled: October 12, 2011Date of Patent: March 25, 2014Assignee: Korea Institute of Geosciences and Mineral Resources (KIGAM)Inventors: Joon-Soo Kim, Kyeong-Woo Chung, Jin-Young Lee, Sung-Don Kim
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Patent number: 8524050Abstract: 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: GrantFiled: December 8, 2011Date of Patent: September 3, 2013Assignee: Hyundai HyscoInventors: Yoo Taek Jeon, Kyeong Woo Chung, Hyun Sik Myung, Yong Sik Yun, Jong In Park, Eun Young Kim
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Patent number: 8475746Abstract: 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: GrantFiled: May 2, 2011Date of Patent: July 2, 2013Assignee: Korea Institute of Geoscience and Mineral ResourcesInventors: Kyeong-Woo Chung, Chul-Joo Kim, Ho-Sung Yoon
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Patent number: 8470269Abstract: 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: GrantFiled: May 2, 2011Date of Patent: June 25, 2013Assignee: Korea Institute of Geoscience and Mineral ResourcesInventors: Kyeong-Woo Chung, Chul-Joo Kim, Ho-Sung Yoon