To investigate the effect of chlorine roasting on the migration and removal of trace elements in quartz lattice, firstly, an efficient pretreatment process, grinding–HCl washing–flotation–HF and HCl leaching, was used to remove the gangue minerals in quartz ore to obtain purified quartz for the preparation of high-purity quartz and the investigation of lattice impurities migration. The results showed that the high-purity quartz with total impurities less than 50 μg/g could be obtained from purified quartz after being treated with chlorine at 1200 °C. The variation of crystal structure and the lattice impurities migration of quartz during chlorine roasting were studied through in-situ XRD, TGA, SEM-EDS, ICP-MS, FT-IR and XPS analysis. It revealed that the decomposable impurities H2O, −OH, and residual collectors in the crystal of purified quartz could be effectively removed through chlorine roasting above 900 °C, which also had an obvious effect on the removal of low-valence trace elements Li, Na and K in the crystal of quartz but didn’t affect the multivalent trace elements Al and Ti. This study revealed the removal and migration mechanism of the trace elements in quartz crystal during chlorine roasting.

中文翻译：

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氯气焙烧过程中石英的晶体结构转变和晶格杂质迁移


为研究氯气焙烧对石英晶格中微量元素迁移和去除的影响，首先采用研磨-HCl洗涤-浮选-HF和HCl浸出的高效前处理工艺，去除石英矿石中的脉石矿物，得到纯化石英，用于制备高纯石英和研究晶格杂质迁移。结果表明，在1200 °C下用氯气处理后，纯化石英可得到总杂质小于50 μg/g的高纯度石英。 通过原位 XRD、TGA、SEM-EDS、ICP-MS、FT-IR 和 XPS 分析研究了石英在氯气焙烧过程中晶体结构的变化和晶格杂质迁移。结果表明，900 °C以上的氯烧可以有效去除纯化石英晶体中的可分解杂质H2O、−OH和残余捕收剂，这对石英晶体中低价微量元素Li、Na和K的去除也有明显效果，但对多价微量元素Al和Ti没有影响。本研究揭示了氯气焙烧过程中石英晶体中微量元素的去除和迁移机制。