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<p>Chlorination roasting is widely recognized as one of the most effective methods for removing lattice impurities. However, there are few studies on HCl gas chlorination roasting. To study the effect of HCl gas chlorination on the migration and removal of lattice impurities in quartz, the gangue minerals in quartz were first removed by the pre-purification process. The pre-purified quartz is subjected to HCl chlorination roasting in a wide high-temperature range of 900–1250&#xa0;°C. The crystal structure changes of quartz and the mechanism of lattice impurity migration and removal were systematically studied by XRD, SEM, FTIR, TGA, XPS, and ICP-OES. The results show that after pre-purified quartz sand is roasted in HCl at 1200&#xa0;°C for 2&#xa0;h, high-purity quartz sand with a purity of 99.996% can be obtained. Chlorination roasting has a significant removal effect on the quartz lattice impurities Na and K, and a certain removal effect on impurities Al, but it has no impact on impurities Li and Ti. Chlorination roasting above 900&#xa0;°C can effectively remove H<sub>2</sub>O and -OH from quartz, causing lattice expansion, which is beneficial for the migration and removal of impurities. The changes in the chemical composition of the quartz surface provide evidence for the formation and volatilization of chlorides.</p>

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Quartz Sand Structure Change and Impurity Removal Behavior in HCl Gas Chlorination Over a Wide High-Temperature Range and its Mechanism

  • 期刊论文

  • 发表日期：

    2025年12月9日

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  • Hao Fu,
  • Xiaotian Chen,
  • Yuziyu Gui,
  • Zhongyu Wang,
  • Xiaoxiao Zhu,
  • Xuesong Jiang,
  • Jifei Sun,
  • Ling Wang,
  • Boyuan Ban,
  • Jian Chen

摘要

Chlorination roasting is widely recognized as one of the most effective methods for removing lattice impurities. However, there are few studies on HCl gas chlorination roasting. To study the effect of HCl gas chlorination on the migration and removal of lattice impurities in quartz, the gangue minerals in quartz were first removed by the pre-purification process. The pre-purified quartz is subjected to HCl chlorination roasting in a wide high-temperature range of 900–1250 °C. The crystal structure changes of quartz and the mechanism of lattice impurity migration and removal were systematically studied by XRD, SEM, FTIR, TGA, XPS, and ICP-OES. The results show that after pre-purified quartz sand is roasted in HCl at 1200 °C for 2 h, high-purity quartz sand with a purity of 99.996% can be obtained. Chlorination roasting has a significant removal effect on the quartz lattice impurities Na and K, and a certain removal effect on impurities Al, but it has no impact on impurities Li and Ti. Chlorination roasting above 900 °C can effectively remove H2O and -OH from quartz, causing lattice expansion, which is beneficial for the migration and removal of impurities. The changes in the chemical composition of the quartz surface provide evidence for the formation and volatilization of chlorides.