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<p>This study investigated the purification of low-grade quartz sand through hydrochloric acid (HCl) leaching and subsequent chlorination roasting to remove impurities such as kaolinite. At an ammonium chloride (NH<sub>4</sub>Cl) concentration of 4 wt.%, a calcination temperature of 900℃, a holding time of 120 min, an HCl concentration of 9%, a leaching temperature of 80℃, a liquid–solid ratio of 5:1, and a leaching time of 60 min, the kaolinite removal rate reached 85.36%.The results indicate that effective removal of impurities is achievable under these conditions. At this time, the final silicon dioxide (SiO<sub>2</sub>) purity was 99.23%. Comprehensive characterization further verified the purification effectiveness. X-ray Diffraction (XRD) analysis revealed the disappearance of the characteristic diffraction peaks of kaolinite in the treated sample, confirming its complete phase removal. Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM–EDS) analysis revealed a substantial reduction in aluminum content in quartz—from 21.7% to 0.4%—after NH<sub>4</sub>Cl roasting and subsequent HCl leaching. Fourier Transform Infrared Spectroscopy (FT-IR) spectra also indicated the disappearance of aluminum–oxygen vibrational bands on the quartz surface. Overall, this study demonstrated an efficient and cost-effective approach for producing high-purity quartz sand by removing kaolinite and other associated impurities.</p>

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Study on Vein Impurity Removal from Quartz Ore by Hydrochloric Acid Leaching and Subsequent Chlorination Roasting

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Yuxuan Tian,
  • Ruizhe Wang,
  • Dandan Wu

摘要

This study investigated the purification of low-grade quartz sand through hydrochloric acid (HCl) leaching and subsequent chlorination roasting to remove impurities such as kaolinite. At an ammonium chloride (NH4Cl) concentration of 4 wt.%, a calcination temperature of 900℃, a holding time of 120 min, an HCl concentration of 9%, a leaching temperature of 80℃, a liquid–solid ratio of 5:1, and a leaching time of 60 min, the kaolinite removal rate reached 85.36%.The results indicate that effective removal of impurities is achievable under these conditions. At this time, the final silicon dioxide (SiO2) purity was 99.23%. Comprehensive characterization further verified the purification effectiveness. X-ray Diffraction (XRD) analysis revealed the disappearance of the characteristic diffraction peaks of kaolinite in the treated sample, confirming its complete phase removal. Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM–EDS) analysis revealed a substantial reduction in aluminum content in quartz—from 21.7% to 0.4%—after NH4Cl roasting and subsequent HCl leaching. Fourier Transform Infrared Spectroscopy (FT-IR) spectra also indicated the disappearance of aluminum–oxygen vibrational bands on the quartz surface. Overall, this study demonstrated an efficient and cost-effective approach for producing high-purity quartz sand by removing kaolinite and other associated impurities.