摘要：为了使天然脉石英达到高纯石英砂的标准,通过煅烧—水淬—浮选—酸洗—乙醇-去离子水洗等工艺提纯石英砂,采用光学显微镜、扫描电镜、X射线衍射、激光粒度仪、电感耦合等离子体光谱仪等手段分析石英砂试样的显微结构、形貌、物相、粒度和成分。结果表明,脉石英矿粗砂粒径分布较均匀,浮选精砂及高温煅烧精砂的粒径明显增大,比表面积明显减小;浮选后精砂的大颗粒为纯石英;筛分、高温处理对石英砂杂质元素去除不明显,浮选、酸浸去除杂质效果显著,脉石英矿经处理后的石英砂中SiO₂的质量分数达到99.99%以上。

关键词：脉石英；提纯；浮选；高纯石英砂

Abstract：To make the natural veins quartz come up the standard for high purity quartz sands,the purifying technology of calcination—water quenching—flotation—acid leaching—purification of alcohol-deionized water was used to obtain high purity of quartz sands.The microstructure,morphology,phase,particle size,and composition of the prepared quartz sands were determined by optical microscope,SEM,XRD,laser particle size and inductively coupled plasma spectrometers.The results show that the particle size distribution of grit is relatively uniform.The particle size of flotation and high temperature calcination fine sands is obviously increased than that of quartz grit,and the specific surface area is obviously decreased.The block matrix of fine sands after flotation is pure quartz.Screening and calcination have no obvious effect on the removal of the impurity elements,while floatation and acid leaching experiments show excellent cleaning effect.The mass fraction of SiO₂ in purified samples is more than 99.99%.

Keywords：vein quartz;purification;flotation;high purity quartz sand