Research on Fluid Inclusions in Vein Quartz as Higher Purity Quartz Sand

As an important new non-metallic electronic material, higher-purity quartz sand has high requirements on impurity elements in inclusions of raw materials．Besides that , the presence of inclusions has an important impact on its purity and performance．Based on this, the fluid inclusions in the vein quartz abroad have been studied in detail by using optical microscope, X-ray diffraction, plasma atomic emission spectroscopy, micro temperature measurement and laser Raman spectroscopy．The results show that the content of SiO₂ in the ore is beyond 99.9%, and the impurity elements are mainly Al, alkali metal elements and Fe．The inclusions in the quartz are single-phase saline solution inclusions, two-phase saline solution inclusions and containing CO₂ three-phase inclusions．There is no solid inclusions in the ore．The uniform temperatures of the two samples inclusions are 120～270℃ and 90～140℃．As a result, the deposit of the ore is medium-low temperature hydrothermal metamorphic quartzite．The raw ore can be used as the raw material of higher purity quartz sand after inclusion elimination and impurity reduction.