hydrometallurgical process by an overall recovery of the components of the lead acid battery exhausted.

摘要

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) desulfurization 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.