For a Pb-Zn-Ag polymetallic sulfide ore of Jiangxi, lead mainly occurs in galenite, zinc mainly occurs in sphalerite, silver mainly exists in the forms of affonite, argentite and pyrargyrite and is closely associated with galenite. In order to rationally explore the mineral resources, the beneficiation researches were made. The results showed that under grinding fineness of -0. 074 mm 78% , and alkaline conditions of pH = 11 when lime formed, with diethyldithiocarbamate + ammonium dibuyldithiophosphate as the combined collector for lead-silver minerals, ZnSO4 + Na2 SO4 as inhibitor for zinc mineral to preferentially concentrate lead and the associated silver minerals, copper sulfate as activator for lead-silver tailings flotation, and butyl xanthate as collector for sphalerite flotation, lead concentrate with grade of 57. 05% and recovery of 88. 11% , and zinc concentrate with grade of 48. 31% and recovery of 86. 29% were obtained respectively. Total silver recovery reached 87. 99% from lead and zinc concentrates.%江西某铅锌银多金属硫化矿石中铅主要以方铅矿形式存在,锌主要以闪锌矿形式存在,银主要以银黝铜矿、辉银矿、深红银矿等形式与方铅矿密切伴生.为合理开发该矿产资源,对其进行了选矿工艺研究.结果表明,在-0.074 mm占78％的磨矿细度和石灰形成的pH =11碱性条件下,以乙硫氮+丁铵黑药为铅银矿物的捕收剂、ZnSO4+Na2SO4为锌矿物的抑制剂优先浮选铅及伴生银矿物,浮铅银尾矿以硫酸铜为活化剂、丁黄药为捕收剂浮选闪锌矿,可获得铅品位为57.05％、铅回收率为88.11％的铅精矿和锌品位为48.31％、锌回收率为86.29％的锌精矿,银在铅、锌精矿中的总回收率达到87.99％.
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