江西某钨矿石中伴生铜锌的回收效果优化

江西某钨矿石中伴生有锡、铜、锌,重选富集钨、锡、铜、锌,混合精矿经浮选获得含铜锌的综合硫化矿,经球磨机-螺旋分级机闭路磨矿至-200目占为43.72%,仅获得铜品位为18.92%、含锌4.29%、铜回收率为96.77%的铜精矿和锌品位为33.17%、含铜2.79%、锌回收率为21.97%的锌精矿,铜锌浮选分离回收效果很不理想,这主要与铜锌矿物单体解离程度较低有关。为了解决铜锌矿物的单体解离问题,在现场探索试验和铜锌矿物单体解离程度较低原因分析的基础上,采用高频振动细筛替代螺旋分级机,在高频振动细筛筛孔宽为0.125 mm的情况下,浮选给矿-200目含量达70.58%,铜精矿铜品位达25.46%、含锌降至2.51%、铜回收率达98.28%,锌精矿锌品位达45.50%、含铜降至0.82%、锌回收率达57.43%,铜精矿品级由四级品提高到二级品,铜回收率也提高了1.51个百分点;锌精矿由原来的不合格品提至七级品,锌回收提高了35.46个百分点,生产指标改善非常显著,企业经济效益和环境效益均得到较大提升。

Optimization of Recovery Effect of Associated Copper and Zinc in a Tungsten Ores in Jiangxi

A tungsten ore in Jiangxi is associated with Tin， copper and zinc， which were enriched by gravity-concentration. After floating with mixed concentrate， the comprehensive sulfide ore containing copper and zinc was obtained. With grinding fineness of -200 mesh 43.72% after treating with ball grinding and spiral classifier， copper concentrate was obtained only with copper grade 18.92%， zinc grade 4.29%， and copper recovery rate 96.77%; Zinc concentrate was obtained with zinc grade 33.17%， copper grade 2.79%， and zinc recovery rate 21.97%. The copper-zinc separation effect was not ideal on account of the low monomer liberation degree. High-frequency vibrating fine screen， instead of spiral classifier， was used to solve the problem on the basis of on-site exploration tests and analysis of the reason for the low monomer liberation degree. On the condition that the hole width of high-frequency vibrating fine mesh screen was 0.125 mm and feeding fineness of sample in the flotation was -200 mesh 70.58%， copper grade reached 25.46%， zinc grade reduced to 2.51%， and copper recovery rate increased to 98.28% with copper concentrate; Zinc grade reached 45.50%， copper grade reduced to 0.82%， and zinc recovery rate increased to 57.43% with zinc concentrate. Copper concentrate was upgraded from the fourth grade to the second grade and copper recovery rate increased by 1.51 percentage points; Zinc concentrate was upgraded from the nonconforming products to the seventh grade and zinc recovery increased by 35.46 percentage points. The improvement of production indexes， economic and environmental benefits of the company were very significant.