The zinc powder exchange

Try to add a sulphate containing salt, such as aluminium sulphate. Lead sulphate is rather insoluble (pKa = 7.8) and should precipitate upon addition of the sulphate containing salt.

Instead of sulfate you may use ammonia water. zinc stays in a solution, lead goes down.

By adding drops of potassium iodide on cold , Lead will precipitate as the yellow precipitate PbI2, which can be completely separated than other by dissolving in hot water

Dear Khaled,

Zinc and lead are usually concomitantly present in Zn-Pb ores and solid wastes, such as electric arc furnace (EAF) dusts. One of the treatment methods is to extract zinc and lead from the ores and wastes by an alkaline leaching process if applicable. The separation of lead from zinc in alkaline or aqueous zinc solution (Zn+2), in leaching solutions of EAF dusts, and in oxidized zinc ores by sodium sulfide precipitation can be good example. When the weight ratio of sodium sulfide (most suitable in leaching process) added to the lead present in alkaline solution was over 1.8–2.0 (molar ratio approximately 1.5–1.7), lead could be separated selectively and quantitatively, while the zinc remained in the solution without concomitant loss. The residues from the precipitation step were identified as mixtures of PbS and Na2Pb(OH)2S, with PbS being the predominant

compound.

Ashish

Maybe of some interest ― while considering PbCl2 precipitation: https://www.researchgate.net/post/How_to_obtain_a_PbCl2_water_solution

Maybe of some interest ― while considering PbSO4 precipitation:  https://www.researchgate.net/post/How_do_I_dissolve_PbSO4_powder_in_distilled_water