Patents by Inventor Marcelo Augusto Castro Lopes da Costa

Marcelo Augusto Castro Lopes da Costa 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).

  • Method for production of metallic cobalt from the nickel solvent extraction raffinate
    Patent number: 8906220
    Abstract: Method for production of metallic cobalt from the raffinate from solvent extraction of nickel’.
    Type: Grant
    Filed: October 19, 2007
    Date of Patent: December 9, 2014
    Inventors: Vanessa Torres, Marcelo Augusto Castro Lopes da Costa, Omar Antunes Do Carmo, Salomão Solino Evelin
  • Process for the instantaneous control of precipitation of nickel and cobalt present in the leach liquor, by adjusting the pH of the solution
    Patent number: 8187360
    Abstract: The present invention concerns a process for the instantaneous control of the precipitation of nickel and cobalt present in a leach liquor by adjustment of the pH-value. Said leach liquor is obtained by pressurized acidic leaching of laterite ores and additionally contains aluminium, ferric and ferrous iron and chromium among others. The process comprises the following steps: precipitation of aluminium, ferric and ferrous iron, chromium etc. by increasing the pH-value by adding a suitable reagent such as lime and/or limestone, following precipitation of nickel and cobalt by further increasing the pH-value of the liquor, finally separating the precipitate from the low-content nickel and cobalt solution. The nickel and cobalt precipitate can be used for further refinement. In order to keep the process conditions constant, the steps of increasing the pH-value are controlled simultaneously.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: May 29, 2012
    Inventors: Vanessa Macedo Torres, Marcelo Augusto Castro Lopes da Costa, Omar Antunes do Carmo, Salomão Solino Evelin
  • METHOD FOR PRODUCTION OF METALLIC COBALT FROM THE NICKEL SOLVENT EXTRACTION RAFFINATE
    Publication number: 20100089764
    Abstract: ‘Method for production of metallic cobalt from the raffinate from solvent extraction of nickel’.
    Type: Application
    Filed: October 19, 2007
    Publication date: April 15, 2010
    Inventors: Vanessa Torres, Marcelo Augusto Castro Lopes Da Costa, Omar Antunes Do Carmo, Salomão Solino Evelin
  • PROCESS FOR THE INSTANTANEOUS CONTROL OF PRECIPITATION OF NICKEL AND COBALT PRESENT IN THE LEACH LIQUOR, BY ADJUSTING THE PH OF THE SOLUTION
    Publication number: 20090241733
    Abstract: The present invention concerns a process for the instantaneous control of the precipitation of nickel and cobalt present in a leach liquor by adjustment of the pH-value. Said leach liquor is obtained by pressurized acidic leaching of laterile ores and additionally contains aluminium, ferric and ferrous iron and chromium among others. The process comprises the following steps: precipitation of aluminium, ferric and ferrous iron, chromium etc. by increasing the pH- value by adding a suitable reagent such as lime and/or limestone, following precipitation of nickel and cobalt by further increasing the pH-value of the liquor, finally separating the precipitate from the low-content nickel and cobalt solution. The nickel and cobalt precipitate can be used for further refinement. In order to keep the process conditions constant, the steps of increasing the pH-value are controlled simultaneously.
    Type: Application
    Filed: June 25, 2007
    Publication date: October 1, 2009
    Inventors: Vanessa Macedo Torres, Marcelo Augusto Castro Lopes da Costa, Salomao Solino Evelin