低品位复杂难选白钨矿选矿工艺研究

Research into benefication process of a law-grade and complex refractory scheelite ore

湖南某矽卡岩型白钨矿,含0.23%WO3、24.48%CaCO3、11.10%CaF2,矿石中钨与钼类质同象替代较为普遍,且含有大量富钙脉石矿物。为了有效回收其中的白钨矿,本文采用常温粗选-加温精选-酸浸的选矿工艺处理该矿石,其中在白钨浮选的常温粗选段,采用了以水玻璃为主的组合抑制剂及新型高效捕收剂TB,同时在精选作业中添加HDZ药剂抑制含钙脉石矿物;在白钨浮选的精选段,采用改进型的"彼得洛夫法",取得了品位64.21%WO3、回收率77.70%的白钨浮选精矿,对白钨浮选精矿进行酸浸,最终得到白钨精矿品位68.29%WO3、回收率75.85%的试验指标,实现了钨矿物与高钙脉石矿物的有效分离。

A skarn scheelite ore containing 0.23%WO3,24.48%CaCO3,11.10%CaF2in Hunan Provine have large amount of calcium-bearing minerals and Mo isomorphously replaces W in scheelite.This paper presents a new technology of tungsten flotation for the ore,which includes rough floatation at normal temperatare,concentration at elerated temperatare and acid leaching.First the ore is sent to tungsten rougher floatation with combined depressors and high efficiency collector,in which HDZ has been used to depress the calcium-bearing minerals in its cleaning.Subseguently by cleaning of tungsten rough concentrate at elevated temperatare with modified＂Petrov method＂,a scheelite concentrate with the grade of 64.21%WO3and the recovery of 77.70% can be obtained.Then the obtained scheelite concentrate of floatation is sent to acid leaching.The lab test shows that a scheelite concentrate with the grade of 68.29%WO3and the recovery of75.85% can be received.At the same timethe effective separation of tungsten and calcium bearing minerals have been achieved.