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

摘要

A HYDROMETALLURGICAL PROCESS FOR THE RECOVERY OF LEAD, SILVER AND GOLD, AS WELLAS ZINC, FROM IMPURE JAROSITE RESIDUES OF AN ELECTROLYTIC ZINC PROCESSABSTRACT OF THE DISCLOSUREThe impure jarosite residue of an electrolytic zinc process is leached in asulfuric-acid-bearing solution in order to produce a leach residue which con-tains lea?, silver and gold and a ferrisulfate-bearing solution and to separatethem from each other, whereafter the leach residue is sulfidized and froth-flotated in order to recover a combined concentrate which contains lead, silverand gold, and the ferrisulfate-bearing solution is fed to a ferritic treatmentstage, in which ferrisulfate and ferrites react in the presence of ions ofalkali and ammonium at 80-105°C and form pure jarosite and zinc sulfate.