Patents Examined by Peter A. Hruskoei
  • Reclamation of molybdenum or other heavy metals from wastewater treatment skimmings
    Patent number: 4222872
    Abstract: Molybdenum or other heavy metal anions and ferric sulfate are reclaimed from wastewater skimmings, that result from treatment of wastewaters through formation of insoluble heavy metal ferric salts and flotation, by treating the skimmings with aqueous caustic at 150.degree.-225.degree. F. to form a solution of the heavy metal anions and a residual solids fraction, separating the solids and contacting the residual solids with sulfuric acid to produce ferric sulfate.
    Type: Grant
    Filed: February 27, 1979
    Date of Patent: September 16, 1980
    Assignee: Dravo Corporation
    Inventor: Ernest R. Ramirez