Patents by Inventor Barbara A. Krebs

Barbara A. Krebs 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).

  • Treating manganese-containing ores with a metal sulfide
    Patent number: 4752332
    Abstract: A process for treating a first metal, manganese-containing ore comprising contacting the manganese-containing ore with an aqueous, acidic composition and a material containing at least one metal sulfide at conditions effective to (1) chemically reduce at least a portion of the manganese, (2) solubilize at least a portion of the metal from the metal sulfide, and (3) at least partially liberate the first metal from the ore; and recovering the first metal from the ore. The use of Thiobacillus ferrooxidans and/or added ferric ion in the contacting step are also disclosed.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: June 21, 1988
    Assignee: Ensci, Inc.
    Inventors: Rebekah Wu, Larry B. Tsai, Barbara A. Krebs-Yuill, David A. Milligan, Nestor J. Troncoso, John S. McBride, Albert T. Knecht
  • Metal value recovery from metal sulfide containing ores
    Patent number: 4740243
    Abstract: A process for recovering at least one first metal from a metal sulfide-containing ore comprising contacting the ore with an aqueous, acidic composition and at least one reducible manganese-containing material at conditions effective (1) to chemically reduce the manganese, (2) solubilize at least a portion of the metal from the sulfide, and (3) at least partially liberate the first metal from the ore; and recovering the first metal from the ore. The use of added ferric ion and/or Thiobacillus ferrooxidans bacteria in the above-noted contacting is also disclosed.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: April 26, 1988
    Assignee: Ensci, Inc.
    Inventors: Barbara A. Krebs-Yuill, Larry B. Tsai, Rebekah Wu, David A. Milligan, Nestor J. Troncoso
  • Process for the recovery of precious metals from a roaster calcine leach residue
    Patent number: 4579589
    Abstract: A process for separating precious metals from a roaster calcine leach residue from a process wherein copper or zinc sulfides are roasted to produce a copper or zinc calcine; the calcine is leached with an aqueous sulfuric acid leaching solution to produce a copper or zinc-containing leaching solution and a roaster calcine leach residue and the copper or zinc-containing leaching solution is separated from the roaster calcine leach residue wherein the process comprises:(a) intimately contacting the roaster calcine leach residue with an aqueous sulfuric acid leach solution containing from about 5 to about 200 grams per liter of sulfuric acid to produce a slurry of leach solution and roaster calcine leach residue and to dissolve precious metal from roaster calcine leach residue;(b) adding copper or zinc sulfide solids to the mixture of leach solution and said roaster calcine each residue;(c) agitating the copper or zinc sulfide solids in intimate contact with the mixture of leach solution and roaster calcine leac
    Type: Grant
    Filed: November 29, 1984
    Date of Patent: April 1, 1986
    Assignee: Atlantic Richfield Company
    Inventors: William A. Yuill, Barbara A. Krebs, Gretchen L. Graef