Overview
Sodium-based additive bentonite is a naturally occurring clay mineral composed primarily of montmorillonite, characterized by its high sodium ion content. This unique composition grants it exceptional water absorption and swelling properties, making it indispensable in industrial applications. Unlike calcium bentonite, sodium bentonite expands up to 15 times its dry volume when hydrated, forming impermeable gels. It is mined from volcanic ash deposits and processed into fine powders or granules for commercial use.
Physical and Chemical Properties
Sodium bentonite’s layered silicate structure enables cation exchange and water molecule adsorption between layers. Its swelling capacity is measured by the free swell index (typically 20–35 mL/2g), a critical metric for industrial buyers. The material exhibits thixotropic behavior, becoming viscous under stress but liquefying when stagnant. Its pH ranges from 8.5 to 10.5, and it has a high surface area (600–800 m²/g), enhancing its reactivity in binding and filtration applications.
Main Applications
In foundries, sodium bentonite binds silica sand for mold creation, withstanding molten metal temperatures. The oil/gas industry relies on it for drilling fluids to stabilize boreholes and remove cuttings. Environmental engineers use it for landfill liners and pond sealing due to its low permeability. Other uses include cat litter (odor control), paper manufacturing (filler), and agriculture (soil conditioner). Emerging applications include nanocomposites and wastewater treatment.
Safety and Storage
While non-hazardous, airborne bentonite dust can irritate lungs. OSHA recommends P1/P2 respirators for prolonged exposure. Storage requires moisture-proof packaging to prevent premature swelling. Bulk storage silos should include desiccants. Spills pose minimal environmental risk but may require containment to prevent drainage clogging. Always consult SDS for handling specifics.
B2B Procurement Guide
Industrial buyers should prioritize suppliers who provide certified lab analysis reports, including swell index, moisture content (max 10%), and particle size distribution. For drilling applications, specify API 13A standards. Foundry-grade bentonite demands high green compression strength (>100 kPa). Consider logistics—bulk shipments reduce costs but require pneumatic tankers or big bags. Spot prices fluctuate with mining output and regional demand.
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