科研之友
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摘要
The granite-hosted Riviera W-Mo-REE deposit is an approximately 40 million ton low grade (similar to 0.2% WO3) endoskarn resource and contains disseminated scheelite as the principle ore. Scheelite is strongly zoned and has a molybdenum-rich core and depleted rim. Separation of the high-demand low-molybdenum scheelite does not appear possible. The high density contrast between scheelite (rho = 6.1) and gangue (rho = 2.7) allows separation by gravity on tables, wet or dry spirals and heavy medium liquids. In the present laboratory study the latter method was used as a pre-concentration stage and yielded at best a similar to 50% scheelite recovery of the -1 mm size fraction. The generally fine grain size of the liberated grains and considerable loss to the -45 mu m fraction is a function of the friable nature of scheelite and possible overgrinding. The influence of this mineralogical characteristic on scheelite recovery will have to be accommodated in the beneficiation in particular the comminution stage, of the deposit in the future. As a complimentary study MicroCT scanning was applied as a relatively new analytical tool to evaluate the beneficiation results obtained. The method studied both sinks and floats of the various size fractions and allowed quantification of scheelite grain size distribution and calculation of ore grade of the coarse fractions. MicroCT images displayed the textural relationships between the ore and gangue minerals and the degree of scheelite liberation. This analytical tool proved useful in the present study and the results indicate that it can be applied to similar ore berieficiation studies.
- 出版日期2018-1-15
- 单位中国林业科学研究院
