某难选低品位钨钼共生矿石工艺矿物学研究

Process Mineralogy of a Refractory Low-Grade Tungsten-Molybdenum Ore

采用MLA技术对难选低品位钨钼矿石进行详细的工艺矿物学研究,测定了矿石矿物组成、嵌布粒度和解离度等工艺矿物学参数,为制定合理的选矿流程提供详实可靠的依据。结果表明,矿石中的主要有价矿物为白钨矿和辉钼矿;脉石矿物以石榴石(钙铁榴石、钙铝榴石)、透闪石、普通辉石、透辉石等磁性脉石为主,还有部分非磁性脉石石英、长石、萤石和方解石等。脉石矿物中富钙脉石含量较高,将对白钨矿选矿产生一定的影响。基于工艺矿物学的研究结果,选矿试验设计了强磁预先丢尾-先浮钼后浮钨的工艺技术路线,取得了钼精矿产率为0.125%,钼品位48.85%,钼回收率64.86%;钨精矿产率为0.27%,WO3品位65.23%,钨回收率74.22%的较好选矿技术指标。

A detailed process mineralogy study was carried out by MLA for a refractory low-grade tungsten-molybdenum ore. The process mineralogy parameters, including mineralogical composition of ore, mineral grain size,and liberation degree were measured quantitatively to provide a basis for designing a reasonable beneficiation flowsheet. According to the process mineralogy results, the valuable minerals in the ore include scheelite and molybdenite; the gangue minerals are dominant with the magnetic gangues, such as garnet（including andradite and grossular）, tremolite, augite, diopside, etc., and some non-magnetic gangues, for example, quartz, feldspar, fluorite,calcite, etc; there are large amounts of C-rich gangues in the ore, which will have a certain influence on separating scheelite. Based on these results, the technology process of pre-discarding the tailings by high intensity magnetic separation combined with floating molybdenum and tungsten sucessively was designed for beneficiation tests. The technology indicators are listed as the following： the yield of molybdenum concentrate is 0.125 % with the grade and recovery of Mo being 48.85 % and 64.86 % respectively; the yield of tungsten concentrate is 0.27 % with the grade and recovery of WO3 being 65.23 % and 74.22 %.