Patent ID: 8562923
Filing Date: 2013-10-22
Classification: C01G,C22B,Y02P

Abstract:
1. A process for obtaining high purity litharge (PbO) from spent lead acid battery paste which comprises the steps of: 1) treating lead add battery paste with a reducing agent selected from the group consisting of sodium meta bisulfite and SO 2) adding a base selected from the group consisting of an alkali hydroxide and sodium carbonate to the aqueous slurry; 3) filtering the slurry to form a cake and washing the cake; 4) adding the cake to a quantitative amount of acetic acid in water to form a concentrated solution of lead acetate; 5) filtering the solution to remove any insolubles; and 6) adding a base to the solution at an elevated temperature to form litharge, the base being selected from the group consisting of sodium hydroxide and potassium hydroxide.