Overview
Quartz sand is a fundamental industrial material derived from quartz-rich rocks like sandstone and granite. It consists primarily of silicon dioxide (SiO2) and is valued for its hardness, chemical stability, and thermal resistance. The global market for quartz sand is driven by its extensive use in glass production, which accounts for over 50% of consumption. Naturally occurring deposits are mined and processed through washing, drying, and screening to achieve desired grain sizes. Industrial grades range from coarse (0.5-1mm) to ultra-fine (0.005mm), with purity levels critical for specialized applications like semiconductor manufacturing.
Physical and Chemical Properties
Quartz sand exhibits a Mohs hardness of 7, making it significantly harder than most minerals. Its crystalline structure remains stable up to 573°C, where it undergoes a reversible phase change. The material is chemically inert to most acids except hydrofluoric acid, which dissolves silica. Optical properties include high transparency in fused quartz form, with a refractive index of 1.544. Electrical resistivity exceeds 10^16 Ω·cm at room temperature, qualifying it as an excellent insulator. Grain shape varies from angular (crushed quartz) to rounded (natural sand), affecting flow characteristics in industrial processes.
Main Applications
In glass manufacturing, high-purity quartz sand (99.5% SiO2) serves as the primary raw material for container glass, flat glass, and specialty glass like fiber optics. Foundries use it to create molds and cores for metal casting due to its thermal shock resistance. Water filtration systems rely on quartz sand's uniform particle size to remove suspended solids. Construction applications include concrete, mortar, and synthetic flooring. Emerging uses encompass solar silicon production and hydraulic fracturing (frac sand), where spherical grains with crush resistance are essential.
Safety and Storage
Prolonged exposure to airborne quartz dust can cause silicosis, requiring OSHA-compliant dust control measures like wet processing or local exhaust ventilation. NIOSH recommends a permissible exposure limit (PEL) of 0.05 mg/m³ for respirable crystalline silica. Storage should prevent contamination from organic materials and moisture. Bulk bags or silos are preferred for industrial quantities, with palletized options for smaller batches. Fire hazards are minimal, but thermal expansion during heating processes requires engineering controls.
B2B Procurement Guide
Key specifications include SiO2 content (industrial grade: 95-98%, high purity: >99%), iron oxide levels (<0.05% for optical glass), and grain size distribution (ASTM or ISO standards). Asian markets typically price 99% purity sand at $80-120/ton FOB, while US frac sand commands $150-200/ton. Verify supplier capabilities for consistent quality control, especially for color-critical applications. Logistics considerations include bulk shipment methods (rail hoppers, barges) for high-volume buyers. Sample testing should assess acid solubility and clay content.
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