Patents by Inventor Rong-Chien Wu

Rong-Chien Wu 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).

  • Production of pure molybdenum oxide from low grade molybdenite concentrates
    Publication number: 20050019247
    Abstract: High purity ammonium dimolybdate or molybdenum oxide is produced by the pressure oxidation of low grade molybdenite concentrates or molybdenum intermediates. The process entails nearly complete oxidation of the sulfide minerals while optimizing the process chemistry and autoclave conditions to solubilize as little of the molybdenum values as possible. The autoclave discharge 12 is then subjected to a leaching step, either an alkaline leach 50, 400 or ammonium leach 250 process, before or after a liquid/solid separation step 20, 220, 410. The solution is then subjected to (a) filtration 60, 410, solvent extraction 70, 440, crystallization 90, 450, and calcination 120, 480 or (b) filtration 260, 280, crystallization 290, and calcination 320 to produce a product suitable for chemical-grade molybdenum oxide 125, 325, 485.
    Type: Application
    Filed: September 26, 2001
    Publication date: January 27, 2005
    Inventors: Robert Balliett, Wolfgang Kummer, John Litz, Lawrence MHugh, Harry Nauta, Paul Queneau, Rong-Chien Wu
  • Autoclave control mechanisms for pressure oxidation of molybdenite
    Patent number: 6818191
    Abstract: The process chemistry during the oxidation of molybdenite concentrates in an oxygen pressure leach can be controlled by regulating the amount of ferric iron and excess sulfuric acid recycled as autoclave discharge slurry or filtrate to the autoclave feed. A computer model capable of predicting the concentration of soluble molybdenum in the autoclave discharge and based on the concentrate and recycle analyses was developed.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: November 16, 2004
    Assignee: H. C. Starck, Inc.
    Inventors: John E. Litz, Paul B. Queneau, Rong-Chien Wu
  • Production of pure molybdenum oxide from low grade molybdeniteconcentrates
    Patent number: 6730279
    Abstract: High purity ammonium dimolybdate or molybdenum oxide is produced by the pressure oxidation of low grade molybdenite concentrates or molybdenum intermediates. The process entails nearly complete oxidation of the sulfide minerals while optimizing the process chemistry and autoclave conditions to solubilize as little of the molybdenum values as possible. The autoclave discharge 12 is then subjected to a leaching step, either an alkaline leach 50, 400 or ammonium leach 250 process, before or after a liquid/solid separation step 20, 220, 410. The solution is then subjected to (a) filtration 60, 410, solvent extraction 70, 440, crystallization 90,450, and calcination 120, 480 or (b) filtration 260, 280, crystallization 290, and calcination 320 to produce a product suitable for chemical-grade molybdenum oxide 125, 325, 485.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: May 4, 2004
    Assignee: H. C. Starck, Inc.
    Inventors: Robert W. Balliett, Wolfgang Kummer, John E. Litz, Lawrence F. McHugh, Harry H. K. Nauta, Paul B. Queneau, Rong-Chien Wu
  • Production of pure molybdenum oxide from low grade molybdeniteconcentrates
    Publication number: 20030086864
    Abstract: High purity ammonium dimolybdate or molybdenum oxide is produced by the pressure oxidation of low grade molybdenite concentrates or molybdenum intermediates. The process entails nearly complete oxidation of the sulfide minerals while optimizing the process chemistry and autoclave conditions to solubilize as little of the molybdenum values as possible. The autoclave discharge 12 is then subjected to a leaching step, either an alkaline leach 50, 400 or ammonium leach 250 process, before or after a liquid/solid separation step 20, 220, 410. The solution is then subjected to (a) filtration 60, 410, solvent extraction 70, 440, crystallization 90,450, and calcination 120, 480 or (b) filtration 260, 280, crystallization 290, and calcination 320 to produce a product suitable for chemical-grade molybdenum oxide 125, 325, 485.
    Type: Application
    Filed: May 9, 2001
    Publication date: May 8, 2003
    Inventors: Robert W. Balliett, Wolfgang Kummer, John E. Litz, Lawrence F. McHugh, Harry H. K. Nauta, Paul B. Queneau, Rong-Chien Wu
  • Autoclave control mechanisms for pressure oxidation of molybdenite
    Publication number: 20030031614
    Abstract: The process chemistry during the oxidation of molybdenite concentrates in an oxygen pressure leach can be controlled by regulating the amount of ferric iron and excess sulfuric acid recycled as autoclave discharge slurry or filtrate to the autoclave feed. A computer model capable of predicting the concentration of soluble molybdenum in the autoclave discharge and based on the concentrate and recycle analyses was developed.
    Type: Application
    Filed: May 9, 2001
    Publication date: February 13, 2003
    Inventors: John E. Litz, Paul B. Queneau, Rong-Chien Wu