难选富银铅锌矿浮选新工艺研究

某难选富银铅锌矿,黄铁矿和毒砂含量高达74%,方铅矿局部氧化,铅锌硫矿物间可浮性差异较小,原工艺添加少量石灰,采用丁基黄药为捕收剂,进行分段粗选和精选,流程结构复杂、分选指标低,铅精矿品位<45%、铅回收率<65%,银在铅精矿中回收率<55%,锌精矿品位<45%、锌回收率<60%,锌精矿含砷>0.5%；新工艺采用增大铅粗选石灰用量、使用GYD作为铅矿物捕收剂、粗精矿集中精选三项措施,简化了流程结构,扩大试验获得良好的浮选指标,铅精矿产率5.36%,铅品位62.23%,含锌3.14%,铅回收率82.40%,含银2214 g/t,银回收率72.02%；锌精矿产率8.04%,锌品位50.45%,含铅1.04%,含砷0.081%,锌回收率88.94%。相比原生产指标：铅精矿品位和回收率提高17%以上,铅精矿中银回收率提高17%以上；锌精矿的品位提高5%以上,锌回收率提高18%以上,锌精矿砷含量下降0.42%以上。当银以包裹体赋存于铅矿物中时,适当增加石灰用量,有利于铅与锌硫分离,改善分选指标。

New Mineral Processing Technology Study on a Refractory Lead-zinc Ore With Rich Silver

Laboratory of Rare Metals Separation and Comprehensive Utilization. Guangzhou P.R China, 510650) ABSTRACT: A refractory lead-zinc ore with high content silver, contains of pyrite and arsenopyrite is over 74%, part of galena was oxide on its surface, so there is small floatability difference among lead-zinc-sulfur minerals. The former process added a small amount of lime and used butyl xanthate as galena collecor in stages rougher and cleaner, its flow-sheet structure was complex, and flotation index was poor, lead concentrate grade was <45% and its recovery rate was <65%, the silver recovery in lead concentrate was <55%. Zinc concentrate grade <45% and its recovery <60%. As contents in zinc concentrate >0.5%. The novel process adopts three measures: increasing the amount of lime used in lead rougher, using GYD as the collector for lead minerals, and centralized cleaning of rougher and scavenger concentrates. So flotation structure is simplified, and good flotation index has obtained in scale-up test, the lead concentrate yield is 5.36%, contains 62.23% Pb, 3.14% Zn and 2214 g/t Ag, and lead and silver recovery are 82.40% and 72.02% respectively. The zinc concentrate yield is 8.04%, contain 50.45% Zn, 1.04% Pb and 0.081% As, and the zinc recovery is 88.94%. Compared with the former production index: lead concentrate grade and recovery has increased by more than 17%, silver recovery in lead concentrate increased by more than 17%. Zinc concentrate grade increased by more than 5%, zinc recovery increased by more than 18%, The arsenic content in zinc concentrate dropped by more than 0.42%. When silver is wrapped in lead minerals as inclusions, an appropriate increase in the amount of lime is beneficial to the separation of lead minerals from zinc and sulfur minerals, and improves flotation index.