Overview
Activated clay is a processed natural montmorillonite clay with enhanced adsorption properties, achieved through acid activation. Widely used since the early 20th century, it serves as a cost-effective adsorbent for removing impurities like pigments, phospholipids, and oxidation products. Its layered structure provides a large surface area (typically 100-300 m²/g), enabling effective chemical bonding with polar compounds. The activation process increases its porosity and creates active sites, making it indispensable in industries requiring high-purity outputs.
Physical and Chemical Properties
Activated clay exhibits a microporous structure with strong surface acidity (pH 2.5-4.5 when mixed with water). Its adsorption capacity depends on activation methods, with sulfuric acid-activated variants showing higher efficiency for color removal in oils. Thermal stability allows usage up to 300°C, though prolonged heating reduces activity. The material is chemically inert to hydrocarbons but reacts with strong alkalis. Particle size (usually 200-400 mesh) affects filtration rates in industrial processes.
Main Applications
In edible oil refining, activated clay removes chlorophyll and peroxides, improving oil clarity and shelf life. Typical dosage ranges from 0.5%-3% of oil weight, depending on impurity levels. Petrochemical applications include lubricant base oil purification and paraffin wax bleaching. Environmental uses encompass heavy metal removal in wastewater and spill containment. Emerging applications involve biodiesel purification and catalyst support in chemical synthesis.
Safety and Storage
As a fine powder, activated clay requires dust control measures. NFPA ratings include Health Hazard 1 and Reactivity 0. Storage in moisture-proof bags (25kg or bulk) prevents clumping and maintains activity. Disposal follows non-hazardous waste regulations, though spent clay from oil refining may require special handling due to organic residues. Reactivation through thermal treatment is possible but rarely economical for industrial-scale users.
B2B Procurement Guide
Industrial buyers should specify technical parameters: bleaching power (≥150 for standard grade), free acidity (≤0.2%), and moisture content (≤12%). Bulk shipments (20+ tons) typically offer 10-15% cost savings over bagged products. Quality certifications like ISO 9001 and food-grade (GB 25571-2010 for China) ensure compliance. Leading producers include Clariant, Taiko Group, and EP Engineered Clays. Sample testing with actual feedstock is recommended before large purchases.
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