从湖南某常温浮钨尾矿中浮选回收萤石试验

湖南某大型钨钼铋多金属矿中含有大量的萤石，现场钼铋等可浮-铋硫混浮-钨“GY法”浮选流程的常温浮钨粗选尾矿CaF₂含量20.54%，-200目占82.0%，主要有用矿物为萤石，嵌布粒度粗细不均，主要为中细粒，与石英、方解石等主要脉石矿物密切共生。为确定其中萤石的回收工艺，进行了选矿试验研究。结果表明，试样以Na₂CO₃为矿浆pH调整剂兼矿泥分散剂，酸化水玻璃为脉石矿物的抑制剂，BK410为捕收剂，采用1粗2扫6精、中矿顺序返回流程处理，最终获得CaF₂品位为93.46%、回收率为62.13%的萤石精矿。按试验确定的工艺流程建设的萤石回收系统运行平稳、可靠，在给矿CaF₂品位为21.20%的情况下，取得了CaF₂品位为90.17%，CaF₂回收率为59.72%的萤石精矿，新系统不仅提高了资源的利用率，还为企业创造了显著的经济效益。

Experimental Study on Recovery of Fluorite by Flotation from the Tailings of Tungsten Flotation at Room Temperature in Hunan Province

A large scale tungsten-molybdenum-bismuth polymetallic ores in Hunan Province contains a large amount of fluorite. After Mo-Bi iso-flotation，Bi-S mixing flotation and tungsten “GY” flotation method at room temperature on the site， the grade of CaF₂ from roughing tailings is 20.54% and -200 mesh accounting for 82.0%. Fluorite is the major useful mineral with uneven particle size which is mainly medium-fine grain size， and closely associated with major gangue minerals such as quartz and calcite. In order to determine the recovery process of fluorite， flotation research was carried out. The results showed that with Na₂CO₃ as slurry pH regulator and slime dispersant， acidized sodium silicate as inhibitor of gangue minerals， BK410 as collector， using one-roughing， two-scavenging， six-cleaning and middles back to the closed circuit in turn， fluorite concentrate with CaF₂ grade of 93.46% and recovery of 62.13% was obtained. The fluorite recovery system determined from the experiments runs smoothly and reliably. Under the condition of CaF₂ with feeding grade of 21.20%， the concentrate of CaF₂ with grade of 90.17% and recovery rate of 59.72% was obtained. The new system not only improves the utilization rate of resources， but also creates remarkable economic benefits for enterprises.