江西某白钨矿选矿工艺研究

Research on Mineral Processing Technology of a Scheelite Ore from Jiangxi

江西某白钨矿矿石中主要有价元素为钨,钨主要以白钨矿形式存在。现场原采用重选工艺回收,生产指标不理想。为提高白钨矿分选指标,进行了系统的选矿试验研究。结果表明,原矿在磨矿细度为-0.074 mm占65%条件下浮选脱硫后,以NaOH+Na2CO3为调整剂、Na2SiO3+GS为抑制剂、731氧化石蜡皂+YK为捕收剂,采用1粗2精2扫预精选—预精选精矿浓缩后经1粗4精2扫—1次2次精选尾矿合并精扫选—精矿返回2次精精选、尾矿返回1次精扫选的工艺流程,获得了WO3品位66.71%、回收率72.91%的钨精矿。根据试验结果对现场工艺进行改造优化后,现场生产获得了WO3品位62.29%、回收率74.21%的钨精矿,较原工艺流程WO3品位和回收率分别提高了10.10和18.86个百分点,钨精矿中硫含量从1.53%降至0.21%,优越性明显。

Main valuable minerals of a scheelite ore in Jiangxi is tungsten,which mainly exists in form of scheelite.Original on-site process is gravity,and the production index is not ideal.Systematic ore dressing research is carried out in order to improve the separation efficiency.The results indicated that,desulfuration by flotation at the grinding fineness of 65％ passing 0.074 mm,using NaOH ＋ Na2CO3 as modifier,Na2SiO3 ＋ GS as depressor,731 oxyparaffin soap ＋ YK as collector,through flotation process of preconcentration of one roughing,one cleaning,two scavenging-thicken for tailings of preconcentration and then through one roughing,four cleaning,two scavenging-combination of tailings of first and second cleaning through clean-scavenging operation-concentrate returning to second clean-cleaning,tailing returning to first clean-scavenging,scheelite concentrate assay 66.71％ WO3 and recovery of 72.91％ was obtained.The on-site process is transformed according to the flotation results,and scheelite concentrate assay 62.29％ WO3 and recovery of 74.21％ was obtained.WO3 grade and recovery of the concentrate increased by 10.10 and 18.86 percentage points respectively compared with the previous,content of sulfur decreased from 1.53％ to 0.21％.The superiority of flotation is apparent.