Abstract:

The lead grade of a silver-rich Pb-Zn ore in Tibet is 2.62%, the zinc grade is 4.46%, and

the associated silver grade is 161 g/t. In order to develop and utilize the ore, the preferential flotation test of

lead, and zinc flotation onlead tailings was carried out. The results show that under the conditions of grinding

fineness of - 0.074 mm accounting for 80%, lime is used as regulator, sodium sulfite and zinc sulfate are

used as inhibitors, diethyl dithiocarbamate and butyl xanthate are used as collectors, and A5 is used as col⁃

lector-foamer agent, by one roughing, two cleanings, two scavengings of lead flotation, lead concentrate with

lead grade of 49.06%, silver content of 2 842 g/t, lead recovery rate of 95.12% and silver recovery rate of

89.67% was obtained. Zinc concentrate with zinc content of 47.16% and zinc recovery of 88.61% was ob⁃

tained by one roughing, two cleanings, two scavengings of zinc flotation using lime as regulator, copper sul⁃

fate as activator, butyl xanthate as collector and 2# oil as foaming agent.The associated element silver is en⁃

riched in lead concentrate with high recovery rate, which realizes the comprehensive recovery of resources.

Key words:

silver-rich Pb-Zn ore, galena, sphalerite, priority flotation