Patent ID: 6117209
Filing Date: 2000-09-12
Classification: C22B,Y02P

Abstract:
A method for recovering soft lead precursor from a dross source containing undue levels of at least one of antimony and tin and wherein the desired soft lead precursor requires separating at least one of the antimony and tin components, the method comprising:(a) providing a lead-containing dross source having at least antimony and tin at an amount requiring separation,(b) mixing the dross source with sulfuric acid to decompose the dross source to provide a slurry in which the liquid phase contains the tin values and the solid phase contains the antimony and lead values and a sulfur component,(c) subjecting said slurry to a first solid/liquid separation and recovering a solid phase therefrom,(d) treating the solid phase recovered from the first solid/liquid separation by the treatment selected from the group consisting of:(i) solubilizing a sulfur component of the solid phase, and(ii) solubilizing by an antimony leach to provide an antimony-rich liquid while obtaining a lead-rich solid phase, and then(e) recovering a soft lead precursor.