Patent ID: 7498012
Filing Date: 2009-03-03
Classification: C22B,H01M,Y02E,Y02P,Y02W

Abstract:
1. A desulfurization process of a pastel and/or grids contained in lead accumulators characterized in that it comprises a desulfurization in two phases, wherein, in the first phase the lead sulfate of the pastel is put in contact with Na 2 CO 3 in solution to react according to the following reaction: providing a dispersion comprising a carbonated pastel based on basic lead carbonates and thereafter decanting the dispersion obtained from the first phase to recover a carbonated pastel based on basic lead carbonates and a basic solution containing Na 2 CO 3 which is neutralized with a solution based on H 2 SO 4 to produce CO 2 according to the reaction: which, in a second phase, is reacted with CO 2 according to the following reaction: to give a dispersion comprising a desulfurized pastel based on PbCO 3 .