Overview
Quartz sand for water filtration is a processed form of high-purity silica sand, specifically graded for use in filtration systems. It serves as a cost-effective and efficient filtration medium due to its chemical inertness and uniform particle structure. Unlike regular construction sand, filtration-grade quartz undergoes washing, drying, and sieving to achieve precise particle sizes (typically 0.4-1.2mm). Its angular grain structure creates optimal void spaces for trapping suspended solids while maintaining high flow rates.
Physical and Chemical Properties
High-quality filtration quartz sand contains >98% SiO2, with minimal clay, organic matter, or soluble salts. The material's hardness (7 on Mohs scale) ensures minimal breakdown during backwashing cycles. Key parameters include effective size (D10), uniformity coefficient (D60/D10), and specific gravity. Acid solubility tests (typically <3% weight loss in HCl) indicate purity. The material's density and angularity contribute to its excellent filtration performance and bed stability.
Main Applications
Industrial applications include pretreatment for reverse osmosis systems, cooling tower water filtration, and wastewater treatment plants. Municipal uses encompass drinking water purification and swimming pool filtration systems. Multimedia filters often layer quartz sand with anthracite or garnet for graded filtration. The sand's chemical resistance makes it suitable for filtering acidic or alkaline waters, though pH stability tests are recommended for extreme conditions.
Safety and Storage
While non-toxic, quartz sand generates respirable crystalline silica dust during handling, requiring NIOSH-approved N95 masks in dusty environments. Bulk storage should prevent contamination from moisture or organic materials. For long-term storage, covered silos or super sacks are preferred. The material is non-flammable but may generate static electricity during pneumatic transfer, necessitating grounding procedures in explosive atmospheres.
B2B Procurement Guide
Specify SiO2 content (preferably ≥98.5%), Fe2O3 content (<0.05% for potable water), and acceptable limits for acid solubility. Particle size distribution should match filter design requirements. Request certified test reports for turbidity removal efficiency and head loss characteristics. For large orders, consider supplier capabilities for consistent quality across batches and inquire about bulk packaging options to reduce logistics costs.
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