Refined Lime Granules
Overview
Refined lime granules are processed calcium oxide (CaO) particles with controlled particle sizes, typically ranging from 1-10 mm. Produced by calcining limestone at high temperatures, these granules offer higher purity and more consistent reactivity compared to standard quicklime. Primarily used in industrial applications, refined lime granules provide advantages in handling and metering accuracy over powdered lime. Their granular form reduces dust generation while maintaining rapid dissolution characteristics when slurry formation is required.
Physical and Chemical Properties
Refined lime granules exhibit strong basic properties with a pH of 12-13 when mixed with water. The material undergoes an exothermic reaction (slaking) upon contact with moisture, generating temperatures up to 150°C and producing calcium hydroxide. Key quality parameters include available lime index (ALI), typically 90-95% CaO content, and reactivity measured by time-temperature curves. The granules demonstrate excellent flow characteristics with angle of repose typically between 30-35 degrees, making them suitable for automated feeding systems.
Main Applications
In steel manufacturing, refined lime granules serve as flux agents to remove impurities during basic oxygen furnace (BOF) operations. Their consistent particle size ensures uniform reaction rates with silicates and phosphates in molten metal. Water treatment plants utilize these granules for pH adjustment and heavy metal precipitation. The agricultural sector applies them for soil pH correction at rates of 1-2 tons per acre, where their slow dissolution provides prolonged neutralizing effects compared to powdered lime.
Safety and Storage
Refined lime granules require careful handling due to their caustic nature. Personnel must wear alkali-resistant gloves, face shields, and protective clothing to prevent contact burns. Storage silos should incorporate moisture barriers and temperature monitoring to prevent premature slaking. Fire hazards exist when storing near combustible materials due to the exothermic wetting reaction. Facilities should maintain eyewash stations and acid neutralization solutions (e.g., vinegar) for emergency exposure treatment. Shelf life typically exceeds 6 months when properly stored in sealed containers.
B2B Procurement Guide
Industrial buyers should specify CaO content (≥92% for premium grades), particle size distribution (e.g., 3-5 mm for most applications), and reactivity parameters. Bulk shipments typically move in 25-ton pneumatic tankers or 1-ton super sacks with moisture barriers. Quality verification should include thermogravimetric analysis (TGA) for active lime content and sieve testing for particle consistency. Leading manufacturers often provide technical data sheets with detailed slaking rate curves and impurity profiles (SiO2, MgO, Al2O3 content).
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