洛南某钼矿堆存废石X射线辐射预选试验

洛南某钼矿投产至今积累了大量堆存废石。为充分利用矿产资源，降低废石堆存对环境的影响，对该废石经破碎-检查筛分后获得的钼品位为0.051%、粒度为20~150 mm的物料进行了X射线辐射预选试验。结果表明：在激发电压为45 kV、滤光片数目为6片、给矿频率为27.5 Hz、分离阈值为0.42条件下，经辐射分选机预选，可以获得钼品位为0.125%、作业回收率为88.10%、对原矿回收率为81.05%的预选精矿。为给该预选精矿的选别提供依据，对其进行了工艺矿物学分析。预选精矿中有用矿物主要为辉钼矿，存在于辉钼矿中的钼占总钼的96.56%；脉石矿物主要为长石，其次为石英和石榴子石、方解石等。预选精矿破碎至-1 mm后，辉钼矿在+0.18 mm粒级的分布率为24.10%，在-0.075 mm粒级的分布率为64.64%，宜采用阶段磨矿-阶段选别的工艺进行回收。

Study on X Fluorescence Pre-separation of a Molybdenum Stockpiling Waste Rock from Luonan

There has been accumulated massive storage waste rock on a molybdenum mine in Luonan.Pre-separation experiments by X fluorescence were conducted on materials with particle size of 20~150 mm，molybdenum grade of 0.051%，for comprehensive utilize of the resource and reduce environment influence caused by waste rock accumulation.Results indicated that pre-concentrate with molybdenum grade of 0.125%，yield recovery of 88.10%，and total recovery of 81.05% was obtained when excitation voltage of 45 kV，filter number of 6，feeding frequency of 27.5 Hz and the separation threshold of 0.42 by radiation sorting machine pre-separation.To provide technique basis for beneficiation of pre-concentrate，process mineralogy research was conducted.Main valuable mineral of pre-concentrate is molybdenite，96.56% of molybdenum exists in molybdenite.Gangue minerals are mainly feldspar，followed by quartz，garnet and calcite，etc.24.10% molybdenite distributed in +0.8 mm fraction，64.64% molybdenite distributed in -0.075 mm fraction after crushed to -1 mm.Stage grinding-stage separation process was recommended for reasonably recovery of the ore.