Overview
Organic bentonite for coal is a specialty clay mineral modified with quaternary ammonium salts to enhance compatibility with hydrocarbon systems. Developed specifically for coal-related industries, it serves as a rheology modifier and suspension agent. Unlike conventional bentonite, this organically treated variant exhibits hydrophobic properties, making it ideal for stabilizing coal-water mixtures and other non-aqueous systems. Its platelet structure expands in organic media, creating three-dimensional networks that prevent particle settling.
Physical and Chemical Properties
The material's effectiveness stems from its layered aluminosilicate structure with exchanged organic cations. These modifications increase the interlayer spacing from 12Å in natural bentonite to 18-22Å, enabling better penetration of organic molecules. Key performance indicators include gel strength (measured in lb/100ft²), yield point, and thixotropic index. Typical products achieve 90-110% swelling capacity in diesel oil within 24 hours. The organic content usually ranges 30-45% by weight, determining its activation threshold temperature (commonly 50-60°C).
Main Applications
In coal-water slurry (CWS) production, it improves slurry stability during transport and storage, maintaining viscosity between 800-1,200 cP. The additive allows higher coal concentrations (65-70%) while reducing sedimentation. Foundry applications utilize its binding properties in coal dust-based mold coatings, enhancing metal casting surface finish. Drilling fluid formulations incorporate 2-5% organic bentonite to control fluid loss in coalbed methane extraction. Emerging uses include coal tar pitch modification and carbon electrode production.
Safety and Storage
Though non-flammable, the powder forms explosive dust clouds at concentrations >50g/m³. Storage silos should incorporate grounding systems to prevent static discharge. Moisture exposure (>5%) causes clumping and reduced efficacy. Personal protective equipment (PPE) requirements include NIOSH-approved N95 respirators, chemical goggles, and impermeable gloves. Spills should be contained with inert absorbents like vermiculite, never washed into waterways due to potential aquatic toxicity from quaternary ammonium compounds.
B2B Procurement Guide
Technical specifications should include: montmorillonite content (>85%), moisture (<3%), sieve residue (200 mesh pass rate >95%), and free amine content (<0.5%). Bulk shipments typically use 25kg multi-layer paper bags with PE lining. Quality verification involves laboratory tests per ISO 13500 standards for drilling applications or GB/T 20973-2007 for coal industry use. Lead times vary seasonally; winter stockpiling is recommended in cold climates where transportation may be disrupted.
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