Patents Assigned to Umetco Minerals Corporation
  • Patent number: 4701309
    Abstract: Method of operating a heap leach for leaching uranium and vanadium from a uranium-vanadium bearing ore formed into a relatively tall heap from a mixture of coarsely crushed ore and concentrated sulfuric acid which involves leaching the heap in sections with each section leached in multiple cycles following a predetermined procedure in which the heap is first leached with dilute acid followed by a strong acid application. The product effluent from the strong acid application is recycled a multiple number of times and advanced to the next section. Each section is then washed with fresh water.
    Type: Grant
    Filed: November 30, 1984
    Date of Patent: October 20, 1987
    Assignee: Umetco Minerals Corporation
    Inventors: Sundaresan Ramachandran, David O. Skiles, Donald J. Hansen
  • Patent number: 4540562
    Abstract: A process is provided for the production of vanadyl hydrate including solvent extraction and stripping steps. The vanadyl hydrate is then reacted with carbon to produce vanadium carbide.
    Type: Grant
    Filed: May 27, 1983
    Date of Patent: September 10, 1985
    Assignee: Umetco Minerals Corporation
    Inventor: Harry E. Gardner