Abstract: A copper， lead and zinc sulfide ore from Inner Mongolia belongs to high-sulfur and high-arsenic with the contents of copper， lead and zinc of 0.26%， 0.72% and 4.60%， respectively， and the contents of sulfur and arsenic in the ores are 13.14% and 2.49%， respectively. In order to realize the effective recovery of copper， lead， zinc and sulfur in the ores and avoid a series of problems caused by traditional high alkalinity method， the conditions tests of copper-lead bulk flotation， magnetic separation for desulfurizing and zinc flotation were studied. The whole process closed-circuit test including the copper-lead bulk flotation with roughing concentrate regrinding cleaning， magnetic separation for desulfurizing with bulk tailings and zinc flotation was conducted based on the conditional test. Finally， the copper and lead mixing concentrate with the copper of 9.27%， the lead of 40.53% and the silver of 4 397.76 g/t were obtained and the recovery rate was 59.22%， 88.93% and 74.05%， respectively. The zinc concentrate with zinc grade of 45.94% and zinc recovery rate of 93.10% was obtained， which realized the effective recovery of associated silver and reduced the harmful impurity arsenic contents in the concentrate.

Key words: copper-lead-zinc ore with high sulfur and arsenic, pyrrhotite, magnetic separation, flotation