Overview
Bagged lime is a commercially packaged form of calcium oxide (quicklime) or calcium hydroxide (slaked lime), essential for industrial and agricultural processes. It is typically supplied in 25-50 kg polywoven bags with moisture barriers to prevent premature reaction. The material is produced by calcining limestone at high temperatures, with quality grades varying by calcium content and reactivity. In B2B markets, bagged lime offers logistical advantages over bulk shipments for smaller-scale operations. Major producers supply standardized packaging with labeling that includes safety data, batch numbers, and compositional analysis to meet regulatory requirements across construction, metallurgy, and environmental sectors.
Physical and Chemical Properties
Quicklime (CaO) exhibits extreme hygroscopicity, rapidly absorbing moisture from air to form slaked lime (Ca(OH)₂) while releasing significant heat. The exothermic reaction reaches temperatures above 150°C, requiring careful handling. Particle size distribution affects reactivity, with finely ground powders (200-400 mesh) preferred for chemical processes. Slaked lime solutions have a pH of 12.4, making them effective for pH adjustment. Both forms demonstrate low solubility in water but react with acids to form calcium salts. Thermal stability allows use in high-temperature applications up to 2,500°C for CaO, though prolonged exposure to CO₂ causes carbonation that reduces effectiveness.
Main Applications
In steel production, bagged lime serves as a flux to remove impurities during smelting. Construction industries use it for soil stabilization and mortar preparation, where its plasticity improves workability. Environmental applications include flue gas desulfurization (FGD) and wastewater treatment for heavy metal precipitation. Agricultural users employ hydrated lime to neutralize acidic soils, with application rates of 1-2 tons per acre. Food-grade calcium hydroxide is essential for corn nixtamalization and pickling. Emerging uses include CO₂ capture technologies and as a reagent in biodiesel production, driving demand for consistent-quality bagged products.
Safety and Storage
Bagged lime requires dry storage on pallets away from acids and organic materials. Damaged packaging must be resealed immediately to prevent moisture ingress that can cause thermal runaway. Facilities should have Class D fire extinguishers available for lime fires. Personnel handling bulk bags need chemical-resistant gloves, face shields, and NIOSH-approved respirators to prevent caustic burns or inhalation injuries. First aid protocols mandate immediate flushing of affected areas with copious water for 15+ minutes. Spill containment measures include using non-combustible absorbents like vermiculite rather than water.
B2B Procurement Guide
Industrial buyers should specify whether they require high-calcium (≥90% CaO) or dolomitic lime (35-46% MgO) based on application needs. Key purchasing metrics include available lime index (ALI), reactivity test results, and sieve analysis data. Thermal activity testing ensures proper calcination. Logistics considerations include minimum order quantities (typically 20+ bags), pallet configuration (often 40 bags/pallet), and lead times (1-4 weeks). Reputable suppliers provide certificates of analysis (CoA) with each shipment and maintain batch traceability. Just-in-time delivery is preferable to prolonged warehouse storage.
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