Abstract: Quartz, as a critical non-metallic mineral resource, plays a crucial role in high-tech industries such as semiconductors, photovoltaics and optical fiber communication etc. With limited resources of high-purity quartz deposits in our country, the search for alternative sources of high-purity quartz has become urgent. Sandstone, a by-product of coal mining, contains a significant amount of quartz, and exploring the extraction of high-purity quartz from it can contribute to the efficient and green utilization of solid waste, expanding the much-needed high-purity quartz resources. This paper focuses on the fine-grained feldspathic quartz graywacke associated with the Huangling Mining Area. Using modern analytical methods such as polarizing microscopy, X-ray fluorescence spectrometry（XRF）, X-ray diffraction analysis（XRD）, and inductively coupled plasma optical emission spectrometry（ICP-OES） etc., this paper studies the content of quartz and impurities under various conditions. The chemical composition and mineral composition, structural structure, mineral embedding characteristics, grain size composition and other process mineralogical features of the graywacke are systematically studied. The graywacke is subjected to a purification process consisting of “washing-magnetic separation-flotation-calcination quenching-acid leaching” to separate and refine the quartz. This paper extensively investigates the influencing factors on quartz purification during the processes of washing for desliming, magnetic separation, flotation, calcination quenching, and acid leaching, determining the optimal conditions for each process step. As a result, a high-purity quartz concentrates with a purity of 99.95% is obtained. The study aims to explore new possibilities for the utilization of coal-related solid waste, holding significant market potential. This work highlights the importance of innovative approaches to resource recovery and sustainable development in the coal industry.