从钨重选粗精矿中浮选回收铜铋试验

粤北某高硫伴生铜、铋的钨矿选矿厂采用枱浮从重选钨粗精矿中回收硫化矿物，再采用抑铋浮铜-重选选铋工艺从硫化矿混合精矿中分离回收铜铋，不仅铜、铋回收率低，且铜精矿含铋高。为解决铜、铋的高效分离与回收问题，以现场重选钨粗精矿为试样，进行了铜、铋分离与回收试验。结果表明：WO₃、Cu、Bi、Ag品位分别为13.66%、3.32%、1.93%和308.50 g/t，主要铜矿物为黄铜矿和辉铜矿，主要铋矿物为辉铋矿，有用矿物粒度主要为0.64~0.04 mm，黑钨矿、白钨矿、黄铁矿嵌布粒度略粗，黄铜矿、辉铋矿粒度略细的试样，在棒磨至-0.2 mm的情况下，以石灰为调整剂、SY为铋抑制剂、Z-200为捕收剂1粗1精2扫流程抑铋浮铜，以GYC-1为铋活化剂、丁基黄药为铋捕收剂1粗2精2扫流程活化浮铋，最终获得铜品位为19.01%、铜回收率为93.51%、含铋0.81%的铜精矿，以及铋品位为21.39%、铋回收率为78.61%、含铜0.63%的铋精矿，与现场生产指标相比，铜精矿铜品位、铜回收率分别提高了10.48和9.19个百分点，含铋下降了1.85个百分点；铋精矿铋品位下降了5.23个百分点、铋回收率提高了33.25个百分点，含铜下降了1.68个百分点，较好地实现了铜、铋的分离与回收。

Experimental Research on Flotation Beneficiation of Cu and Bi from Gravity Roughing Concentrate of Tungsten

The dressing plant of high-sulfur tungsten ores associated with copper and bismuth in northern Guangdong province adopted table-flotation to recover sulfide minerals from gravity tungsten roughing concentrate， then recycle Cu and Bi by repressing bismuth before floating the copper and concentrate bismuth by gravity separation from mixed sulfide ores. The recovery of copper and bismuth by this method is low and the copper concentrate contains large amount of bismuth. In order to solve the problem of efficient separation and recovery of copper and bismuth， experiments of separation and recovery of copper and bismuth taking gravity roughing concentrate of tungsten as the samples were carried out. The results showed that the grade of WO₃， Cu， Bi and Ag are 13.66%， 3.32%， 1.93% and 308.50 g/t respectively. The main copper minerals are chalcopyrite and chalcocite， and the main bismuth mineral is bismuth. The particle size of useful minerals ranges from 0.04 mm to 0.64 mm. Wolframite， scheelite and pyrite are coarse-grain dissemination， and chalcopyrite and bismuth ores are fine-grain dissemination. In the case of the rod milling with particle size below 0.2 mm， lime as regulator， SY as bismuth depressant and Z-200 as collector， Bi was inhibited and Cu was floated by the process of one-roughing one-cleaning and two-scavenging. Bismuth was activated by the process of one-roughing two-cleaning and two-scavenging with GYC-1 as bismuth activator and butyl xanthate as bismuth collector. The copper concentrate with 19.01% copper grade， 93.51% copper recovery rate and 0.81% bismuth content， and the bismuth concentrate with 21.39% bismuth grade， 78.61% bismuth recovery rate and 0.63% copper content were obtained finally. Compared with the on-site production index， the copper grade and copper recovery rate of copper concentrate were increased by 10.48 percentage points and 9.19 percentage points respectively， and the bismuth content of copper concentrate was decreased by 1.85 percentage points. The bismuth grade of bismuth concentrate was decreased by 5.23 percentage points， the bismuth recovery was increased by 33.25 percentage points， and the copper content was decreased by 1.68 percentage points. The separation and recovery of copper and bismuth are well realized.