C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/340
C22B 3/00 (2006.01) H01M 10/54 (2006.01)
Patent
CA 1333960
The invention relates to a hydrometallurgical process for the overall recovery of the components of exhausted lead-acid batteries, in a re-useable form, said components being mainly constituted by such materials as polypropylene, ebanite, PVC; by paste comprising lead sulphatized compounds; and by pure or alloyed metal lead, characterized in that it comprises the following steps: a) battery crushing, b) separation of paste by wet-screening, c) separation of polypropylene by water floating, d) separation of ebanite and PVC from pure or alloyed metal lead, by means of a first hydrodynamic separation, e) separation of ebanite from PVC by a second hydrodynamic separation, f) desulphatization of paste by carbonation by sodium carbonate, with pure sodium sulphate being obtained, g) recovery of so-obtained pure sodium sulphate, h) treatment of carbonated paste in order to recovery from it the lead, in pure metal form, by extraction by electrowinning.
526957
Fracchia Pierluigi
Olper Marco
B.u.s Engitec Servizi Ambientali S.r.l.
Swabey Ogilvy Renault
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