Patents by Inventor Myong Jun Kim

Myong Jun Kim 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: 20250183398
    Abstract: In a method of selectively recovering a valuable metal from lithium secondary battery waste, a complex oxide is separated from a lithium secondary battery waste powder. The powder is dissolved in sulfuric acid. The solution is separated into a solution and a residue by solid-liquid separation. The solution is subjected to solid-liquid separation to produce a solution and a solid. Valuable metal manganese is extracted from the solution by solvent extraction, and the remaining valuable metals including cobalt, nickel, and lithium are separated into a first raffinate. Valuable metal cobalt is extracted from the first raffinate by solvent extraction, and the remaining valuable metals are separated into a second raffinate. Valuable metal nickel is extracted from the second raffinate by solvent extraction, and the remaining valuable metal lithium is separated into a third raffinate. Valuable metal lithium is extracted and concentrated from the third raffinate.
    Type: Application
    Filed: April 6, 2022
    Publication date: June 5, 2025
    Inventors: MYONG JUN KIM, JEON WOONG AN, YOUN KYU YI
  • Publication number: 20250011181
    Abstract: In a method of preparing lithium hydroxide, a mixture of low-purity lithium carbonate and barium hydroxide is heat-treated, the resulting product obtained through the heat treatment is leached by adding water to form a first slurry including an aqueous lithium hydroxide solution and an insoluble by-product, the first slurry is filtered to separate the lithium hydroxide solution and the insoluble by-product, and the lithium hydroxide solution separated through the filtering of the first slurry is evaporated, thereby obtaining lithium hydroxide.
    Type: Application
    Filed: October 28, 2022
    Publication date: January 9, 2025
    Inventor: MYONG JUN KIM
  • Publication number: 20230373802
    Abstract: In a method for preparing lithium hydroxide, a first mixture of lithium sulfate (Li2SO4) and barium hydroxide (Ba(OH)2) is prepared, a second mixture that is converted into insoluble lithium sulfate (BaSO4) and soluble lithium hydroxide (LiOH) is prepared by roasting the first mixture, the second mixture is dissolved to precipitate the insoluble barium sulfate (BaSO4), the precipitated barium sulfate (BaSO4) is separated by solid-liquid separation, and the solution from which the barium sulfate (BaSO4) is separated is evaporated to obtain lithium hydroxide (LiOH).
    Type: Application
    Filed: November 23, 2020
    Publication date: November 23, 2023
    Inventor: Myong Jun KIM
  • Patent number: 9663384
    Abstract: A method for producing high-purity trimanganese tetraoxide from dust containing manganese includes adding sulfuric acid (H2SO4) and a reductant to manganese dust and leaching manganese therefrom; eliminating primary impurities by adding calcium hydroxide (Ca(OH)2)) to the leached manganese solution acquired from the leaching step; eliminating secondary impurities by adding sulfides to the leached manganese solution from which primary impurities have been eliminated; precipitating manganese by using sodium hydroxide (NaOH) so as to control the pH in the leached manganese solution from which secondary impurities have been eliminated, and cleaning and drying the precipitated specimen; and acquiring high-purity trimanganese tetraoxide by injecting the dried specimen with air and heat-treating same under oxidizing conditions. Thus the present invention allows high-purity trimanganese tetraoxide to be produced from dust containing manganese, for use as material for a secondary battery.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: May 30, 2017
    Assignee: INDUSTRY FOUNDATION OF CHONNAM NATIONAL UNIVERSITY
    Inventors: Myong Jun Kim, Tam Tran
  • Publication number: 20160200587
    Abstract: Disclosed is a method for manufacturing hydrated magnesium carbonate. Designed to produce high-purity hydrated magnesium carbonate from a solution where calcium ions and magnesium ions coexist, the method can add value to the resources. Compared to conventional techniques, the method can be conducted in a simpler procedure and allows for the production of high purity magnesium oxide (MgO), thus bringing about an economical benefit.
    Type: Application
    Filed: August 4, 2015
    Publication date: July 14, 2016
    Inventors: Myong Jun KIM, Tam TRAN
  • Patent number: 9365912
    Abstract: A method for producing high-purity manganese sulfate monohydrate from a low-grade composition includes acquiring a primary leached manganese solution by adding sulfuric acid and a reductant to a low-grade manganese-containing composition and leaching manganese therefrom; acquiring a secondary leached manganese solution from which primary impurities have been eliminated by adding calcium hydroxide to the primary leached manganese solution; acquiring a tertiary leached manganese solution from which secondary impurities have been eliminated by adding sulfides to the secondary leached manganese solution; acquiring manganese oxide from precipitating manganese by using sodium hydroxide in the tertiary leached manganese solution so as to control the pH thereof; adding sulfuric acid to the manganese oxide and redissolving; and drying the redissolved manganese oxide and acquiring high-purity manganese sulfate monohydrate.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: June 14, 2016
    Assignee: INDUSTRY FOUNDATION OF CHONNAM NATIONAL UNIVERSITY
    Inventors: Myong Jun Kim, Tam Tran
  • Publication number: 20150125366
    Abstract: A method for producing high-purity trimanganese tetraoxide from dust containing manganese includes adding sulfuric acid (H2SO4) and a reductant to manganese dust and leaching manganese therefrom; eliminating primary impurities by adding calcium hydroxide (Ca(OH)2)) to the leached manganese solution acquired from the leaching step; eliminating secondary impurities by adding sulfides to the leached manganese solution from which primary impurities have been eliminated; precipitating manganese by using sodium hydroxide (NaOH) so as to control the pH in the leached manganese solution from which secondary impurities have been eliminated, and cleaning and drying the precipitated specimen; and acquiring high-purity trimanganese tetraoxide by injecting the dried specimen with air and heat-treating same under oxidizing conditions. Thus the present invention allows high-purity trimanganese tetraoxide to be produced from dust containing manganese, for use as material for a secondary battery.
    Type: Application
    Filed: April 30, 2013
    Publication date: May 7, 2015
    Inventors: Myong Jun Kim, Tam Tran
  • Publication number: 20150110692
    Abstract: A method for producing high-purity manganese sulfate monohydrate from a low-grade composition includes acquiring a primary leached manganese solution by adding sulfuric acid and a reductant to a low-grade manganese-containing composition and leaching manganese therefrom; acquiring a secondary leached manganese solution from which primary impurities have been eliminated by adding calcium hydroxide to the primary leached manganese solution; acquiring a tertiary leached manganese solution from which secondary impurities have been eliminated by adding sulfides to the secondary leached manganese solution; acquiring manganese oxide from precipitating manganese by using sodium hydroxide in the tertiary leached manganese solution so as to control the pH thereof; adding sulfuric acid to the manganese oxide and redissolving; and drying the redissolved manganese oxide and acquiring high-purity manganese sulfate monohydrate.
    Type: Application
    Filed: December 28, 2012
    Publication date: April 23, 2015
    Inventors: Myong Jun Kim, Tam Tran