Abstract:Chlorination leaching process of lead sulphide concentrate in hydrochloric acid-oxygen system was studied. A variety of parameters on the effect of lead and silver leaching rate and enriching rate of sulfur in leaching residue were investigated. The results indicate that the leaching effect of lead sulphide concentrate in magnesium chloride solution is superior to that in sodium chloride solution. Lead and silver leaching rate achieved 99.11%, 90.57% respectively, and enriching rate of sulphur is 90.12% under the optimum parameters that catalyst copper ion concentration is 1.45 g/L, hydrochloric acid dosage is 1.5 times to theoretical quantity, oxygen flow is 40 mL/min, magnesium chloride concentration is 5.5 mol/L, leaching temperature is 90 ℃, leaching time is 7 hours, ratio of liquid to solid is 6∶1.