富含可溶性盐高硫铅锌矿无碱浮选工艺研究

云南某铅锌矿有些高硫铅锌矿石中硫酸锌、硫酸亚铁等可溶性盐类含量高，使浮选矿浆中存在大量的Zn2+，Fe2+等金属离子。按常规浮选工艺用石灰抑制黄铁矿时，这些金属离子与石灰作用产生大量的氢氧化物沉淀，对铅锌矿物有很强的抑制作用，造成铅锌矿物不能有效分选。为减少可溶性盐对铅锌浮选的影响，采用在矿浆自然酸碱性（酸性）下浮选铅锌矿物的无碱工艺，选铅时以硫酸锌和亚硫酸钠作抑制剂，以苯胺黑药和丁铵黑药作铅捕收剂，选锌时以水玻璃、亚硫酸钠、羧甲纤维素作调整剂，以PN405作锌捕收剂，获得了含铅59.57%，铅回收率为75.14%的铅精矿和含锌53.93%，锌回收率为93.70%的锌精矿。

Research on Alkali-free Flotation Process of Soluble Salt-rich High Sulfur Lead-zinc Ores

There are high content of soluble salts as zinc sulfate and ferrous sulfate in some high sulfur lead-zinc deposits in a Yunnan Lead-zinc Mine, so that a large number of Zn2+, Fe2+ metal ions exist in flotation pulps.When pyrite is suppressed with lime in conventional flotation process, a large amount of hydroxide precipitation is produced with reaction of these metal ions with lime, which has a strong inhibitory effect on lead-zinc ores, resulting in an ineffective separation of lead-zinc complex ores.In order to reduce the impact of soluble salts on flotation of lead-zinc ores, the alkali-free flotation is adopted under the natural pH (acid) condition.For lead separation, zinc sulfate and sodium sulfate are taken as inhibitors, and aniline and drugs and ammonium drugs as collector; For zinc, the sodium silicate, sodium, carboxymethyl cellulose are taken as a modifier, PN405 as collector of zinc.Lastly, 59.57% lead concentrate with recovery of 75.14 % and 53.93% zinc concentrate with recovery of 93.70% have been obtained.