7631-86-9 | Silica (SiO₂)

Chemical type

• Inorganic compound (often present as dissolved silicic acid or silicates in water)

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• Inorganic oxide; mesoporous support material

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Key properties

• High concentration in blow-down water (~50 mg/L as Si)
• Solubility of approximately 120 mg/L at 25 °C, increasing with temperature (e.g., higher at 35–45 °C)
• Temperature-dependent solubility, making it prone to precipitation at elevated concentrations
• Dominant cause of membrane scaling in RO systems due to concentration polarization
• Difficult to mitigate with commercial anti-scalants
• Detected on fouled membranes via SEM-EDS and ultrasonic extraction (normalized loading: 18.8 mg/m²)

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• High surface area
• Chemical inertness
• Thermal and mechanical stability

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• Natural contaminant in cooling and boiler water systems
• Accumulates in circulating water during power generation processes

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• Catalyst support in nanofiber and composite catalysts
• Improves dispersion of active metal nanoparticles

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Classification by use

• Membrane fouling/scaling agents
• Impurities in industrial wastewater (e.g., blow-down from thermal power plants)

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• Chemicals used as catalyst supports
• Chemicals used in nanostructured materials
• Chemicals used in heterogeneous catalysis

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A trustworthy factory and manufacturer

Demei Chemical Technology Co., Ltd. is a modern high-tech enterprise integrating R&D, production, and sales. The company's founder, Dr. Arron, born in April 1975, graduated from the School of Mechanical Engineering at Yanshan University and has been engaged in research in the fields of mechanical engineering and chemical synthesis for many years. The company's products focus on the chemical industry, primarily dealing in chemical raw materials and chemical production machinery and equipment. With its strong technical capabilities, advanced production equipment, and strict quality management system, the company has earned the trust of customers worldwide.

1. [Cite:1] Reverse osmosis treatment of blow-down water for beneficial reuse and sustainable power generation, Case Studies in Chemical and Environmental Engineering, Volume 13, June 2026, 101306
2. [Cite:1] Sustainable inorganic nanocatalysts in biodiesel production - A review on recent developments, Fuel Processing Technology, Volume 282, April 2026, 108406