Patents by Inventor Daniel W. Ashman

Daniel W. Ashman 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).

  • Heap bioleaching process for the extraction of zinc
    Patent number: 7455715
    Abstract: A method of extracting zinc from a sulphidic ore is provided which comprises bioleaching the ore in a heap with acidophilic microorganisms to produce a pregnant leach solution which is recovered from the bottom of the heap. An integrated process which comprises subjecting the pregnant leach solution to neutralization and solvent extraction to produce a concentrated zinc solution is also provided. Zinc may be recovered from the concentrated solution by means of electrowinning, either in the absence or presence of manganese. Alternatively zinc may be recovered in the form of a zinc compound.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: November 25, 2008
    Assignee: Teck Cominco Metals Ltd.
    Inventors: Juris R. Harlamovs, Daniel W. Ashman, Jose Alberto Gonzalez Dominguez, Hector M. Lizama, Dilipkumar D. Makwana, Andrew W. Stradling
  • Heap bioleaching process for the extraction of zinc
    Patent number: 6736877
    Abstract: A method of extracting zinc from a sulphidic ore is provided which comprises bioleaching the ore in a heap with acidophilic microorganisms to produce a pregnant leach solution which is recovered from the bottom of the heap. An integrated process which comprises subjecting the pregnant leach solution to neutralization and solvent extraction to produce a concentrated zinc solution is also provided. Zinc may be recovered from the concentrated solution by means of electrowinning, either in the absence or presence of manganese. Alternatively zinc may be recovered in the form of a zinc compound.
    Type: Grant
    Filed: November 23, 2001
    Date of Patent: May 18, 2004
    Assignee: Teck Cominco Metals Ltd.
    Inventors: Juris R. Harlamovs, Daniel W. Ashman, Jose Alberto Gonzalez Dominguez, Hector M. Lizama, Dilipkumar D. Makwana, Andrew W. Stradling
  • Heap bioleaching process for the extraction of zinc
    Publication number: 20030089201
    Abstract: A method of extracting zinc from a sulphidic ore is provided which comprises bioleaching the ore in a heap with acidophilic microorganisms to produce a pregnant leach solution which is recovered from the bottom of the heap. An integrated process which comprises subjecting the pregnant leach solution to neutralization and solvent extraction to produce a concentrated zinc solution is also provided. Zinc may be recovered from the concentrated solution by means of electrowinning, either in the absence or presence of manganese. Alternatively zinc may be recovered in the form of a zinc compound.
    Type: Application
    Filed: November 23, 2001
    Publication date: May 15, 2003
    Applicant: TECK COMINCO METALS LTD.
    Inventors: Juris R. Harlamovs, Daniel W. Ashman, Jose Alberto Gonzalez Dominguez, Hector M. Lizama, Dilipkumar D. Makwana, Andrew W. Stradling