Patents by Inventor German A. Alvarez Villanueva

German A. Alvarez Villanueva 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).

  • Hydrometallurgical process for the recovery of nickel and cobalt by ammoniacal leaching
    Patent number: 6524367
    Abstract: The present is a hydrometallurgical procedure for nickel and cobalt recovery, which involves leaching with ammonia-ammonium carbonate solution of the nickel and cobalt bearing mineral material, using a tubular reactors aid mineral material is previously submitted to processes such as selective reduction, cooling, new ammonia leaching, liquid/solid separation and/or nickel and/or cobalt extraction by solvent or ion-exchange resin, allowing the recovery of all the extractable nickel and up to the 130% cobalt extraction reported by the standard ammonia-ammonium leaching.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: February 25, 2003
    Assignee: Centro de Investigaciones Para la Industria Minero-Metalurgcia (CIPIMM)
    Inventors: Jose Castellanos Suarez, German A. Alvarez Villanueva, Ana Maria De La Cruz Fuxa, Pilar Martin Gonzalez, Isabel Lobaina Urtafe, Oscar Perez Laurencio, Milagros Escalona Rodiguez