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本文研究了用磷酸溶矿分析测试文象岩中游离石英的实验原理和方法，并对其准确性进行了验证。结果表明该法简便、快速，有良好的准确度和精密度。完全适用于工业生产测试的要求。
In this paper, the experimental principle and method of phosphoric acid dissolution analysis for the determination of free quartz in graphic rock are studied, and its accuracy is verified. The results show that the method is simple, fast, with good accuracy and precision. Fully suitable for industrial production test requirements.