Patents by Inventor Joao Alberto de Lessa Tude

Joao Alberto de Lessa Tude 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).

  • Magnesium recycling and sulphur recovery in leaching of lateritic nickel ores
    Patent number: 8470272
    Abstract: The present invention resides in a process of recovering nickel and cobalt, regenerating the main raw materials, said process including the steps of: granulometric separation; leaching; neutralization; MHP production in only one stage and the pressure crystallization of magnesium sulphite. The process proposes a way to recovery nickel and cobalt from laterite ores through the atmospheric and heap leaching with staged addition of ore—by size separation—and H2SO4, decreasing the nickel losses and simplifying the neutralization circuit and producing a more purified MHP. The present process route is employed for nickel extraction, including the one from high magnesium containing lateritic ores.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: June 25, 2013
    Assignee: Vale S.A.
    Inventors: Antonio Clareti Pereira, Felipe Hilario Guimaraes, Joao Alberto de Lessa Tude, Lino Rodrigues de Freitas, Tiago Valentim Berni
  • MAGNESIUM RECYCLING AND SULPHUR RECOVERY IN LEACHING OF LATERITIC NICKEL ORES
    Publication number: 20110110832
    Abstract: The present invention resides in a process of recovering nickel and cobalt, regenerating the main raw materials, said process including the steps of: granulometric separation; leaching; neutralization; MHP production in only one stage and the pressure crystallization of magnesium sulphite. The process proposes a way to recovery nickel and cobalt from laterite ores through the atmospheric and heap leaching with staged addition of ore—by size separation—and H2SO4, decreasing the nickel losses and simplifying the neutralization circuit and producing a more purified MHP. The present process route is employed for nickel extraction, including the one from high magnesium containing lateritic ores.
    Type: Application
    Filed: June 1, 2009
    Publication date: May 12, 2011
    Applicant: VALE S.A.
    Inventors: Antonio Clareti Pereira, Felipe Hilario Guimaraes, Joao Alberto de Lessa Tude, Lino Rodrigues de Freitas, Tiago Valentim Berni