Patents Assigned to Hydrometal S.p.A.
  • Hydrometallurgical method for recovering metal materials from spent lead-acid storage batteries
    Patent number: 4460442
    Abstract: In the method the ground scraps are screened to separate the pole active material, i.e. Pb and PbO.sub.2, as fines. This active material is then reacted in the presence of a strong alkaline solution to yield a minium precipitate.Minium may be subsequently treated with an appropriate acid, such as fluoboric acid, freed of antimony by precipitating the latter with metal lead, and then subjected to electrolysis to recover lead.
    Type: Grant
    Filed: August 16, 1982
    Date of Patent: July 17, 1984
    Assignee: Hydrometal S.p.A.
    Inventor: Umberto Ducati