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Vacuum roasting to enhance the removal of muscovite from quartz by controlling the decomposition pathway
Minerals Engineering ( IF 4.9 ) Pub Date : 2025-05-31 , DOI: 10.1016/j.mineng.2025.109472
Songjiang Guo, Junjie Zhao, Guangying Zhang, Shicong Yang, Kuixian Wei, Wenhui Ma

The removal of muscovite impurities from quartz ore determines the final purity of high-grade quartz sand. To improve the removal of muscovite by leaching, this study systematically investigated the effect of atmospheric roasting and vacuum roasting on muscovite decomposition pathways through thermodynamic analysis and phase characterization. The results revealed that vacuum roasting caused the muscovite to decompose according to the reaction pathway of R6 and completely decomposed into small molecular substances, significantly lowered the Gibbs free energy change (ΔG) of reaction (R6), allowing it to occur at the studied roasting temperatures. This process prevented the formation of KAlSi2O6 during roasting while facilitating the direct volatilization of potassium (K) and the transformation of aluminum (Al) into leachable Al2O3. The experimental results demonstrated that vacuum roasting significantly enhanced the leaching removal of muscovite, increasing the optimal removal ratios of Al and K to 82.7% and 98.1%, respectively, compared to 72.4% and 94.6% achieved with atmospheric roasting. This innovative vacuum roasting method provides a solution to produce high-purity quartz by removing muscovite impurities.

中文翻译:

真空焙烧通过控制分解途径来增强从石英中去除白云母

从石英矿石中去除白云母杂质决定了高品位石英砂的最终纯度。为了提高浸出对白云母的去除率,本研究通过热力学分析和物相表征,系统研究了常压焙烧和真空焙烧对白云母分解途径的影响。结果表明,真空焙烧使白云母根据 R6 的反应途径分解并完全分解成小分子物质,显著降低了反应 (R6) 的吉布斯自由能变化 (ΔG),使其能够在所研究的焙烧温度下发生。这个过程阻止了焙烧过程中 KAlSi2O6 的形成,同时促进了钾 (K) 的直接挥发和铝 (Al) 转化为可浸出的 Al2O3。实验结果表明,真空焙烧显著提高了白云母的浸出去除率,将 Al 和 K 的最佳去除率分别提高到 82.7% 和 98.1%,而常压焙烧则达到 72.4% 和 94.6%。这种创新的真空焙烧方法提供了一种通过去除白云母杂质来生产高纯度石英的解决方案。
更新日期:2025-05-31
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