Quartz sand is a type of quartz made from crushed quartzite, known for high refractoriness, chemical stability, and wide industrial applications. This article provides a comprehensive analysis of five main types of quartz sand: ordinary, refined, high purity, fused quartz sand, and silica flour. Each type is detailed with its SiO2 and Fe2O3 content, production processes, characteristics, and applications in metallurgy, glass manufacturing, refractory materials, ceramics, construction, electronics, and more. Readers will learn how to select the appropriate type of quartz sand for different industrial needs and understand key performance indicators for practical reference.