A HYDROMETALLURGICAL PROCESS FOR THE RECOVERY OF LEAD,SILVER,GOLD AND ZINC FROM IMPURE JAROSITE RESIDUES OF AN ELECTROLYTIC ZINC PROCESS

摘要

pThe impure jarosite residue of an electrolytic zinc process is leached in a sulfuric-acid-bearing solution in order to produce a leach residue which contains lead, silver and gold and a ferrisulfate-bearing solution and to separate them from each other, whereafter the leach residue is sulfidized and froth-flotated in order to recover a combined concentrate which contains lead, silver and gold, and the ferrisulfate-bearing solution is fed to a ferritic treatment stage, in which ferrisulfate and ferrites react in the presence of ions of alkali and ammonium at 80 DEG -105 DEG C. and form pure jarosite and zinc sulfate./p[US4366127A]