Patents Assigned to UM Enginerring S.A.
  • Process for the elution of precious metals absorbed on active carbon
    Patent number: 5769925
    Abstract: A powerful reducing agent such as hydrazine monohydrate is added to the standard eluent solutions such as NsOH-NaCN with or without alcohol. The kinetics of elution of gold or of silver are thus markedly enhanced.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: June 23, 1998
    Assignee: UM Enginerring S.A.
    Inventors: Sarah Harvey, Andre Van Lierde, Pierre Louis