Comparative Study on High Purity Quartz Sand Used in Typical Photovoltaic Crucible
Three kinds of high purity quartz sand for crucible production by Sibelco,Norway TQC and Jiangsu Pacific Quartz Co.,Ltd.were taken as the research objects.The characteristics of particle size distribution,micro-morphology,chemical composition and crystal cell parameters of the three kinds of high purity quartz sand for crucible were analyzed by means of laser particle size analysis,optical microscope,scanning elec-tron microscope and X-ray diffraction.The results show that the particle size of high purity quartz sand for crucible production by Sibelco and TQC are concentrated at about 200 μm,and the uniformity of shape and size is better than that of quartz sand produced by Jiangsu Pacific Quartz Co.,Ltd.The contents of inclusions and individual elements are slightly higher in the three samples,but it does not affect the production of quartz cruci-ble.The content of chemical elements in quartz sand will affect the change of crystal cell parameters,the a value of the three samples are small,and the c value of the quartz sand produced by Jiangsu Pacific Quartz Co.,Ltd.is large.The comparative analysis of the micro-morphology of quartz sand with different leaching media shows that the three quartz samples are all treated with high temperature calcination and hydrofluoric acid leach-ing,and there are traces of nitric acid leaching in the high purity quartz sand for crucible production by TQC.
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