Overview
Lump quicklime, chemically known as calcium oxide (CaO), is produced by calcining limestone (calcium carbonate) at high temperatures (900-1200°C). This process drives off carbon dioxide, leaving behind highly reactive CaO in lump or granular form. As one of the oldest industrial chemicals, it has been used since antiquity for construction and agricultural purposes. Modern production methods ensure consistent quality for industrial applications. The lump form offers handling advantages in bulk transport and controlled reactivity compared to powdered varieties. Its high alkalinity and exothermic reaction with water make it valuable across multiple industries.
Physical and Chemical Properties
Lump quicklime appears as hard, white to grayish-white solids with an irregular crystalline structure. Its high melting point (2572°C) reflects exceptional thermal stability. The material exhibits hygroscopic properties, readily absorbing moisture from air to form calcium hydroxide (slaked lime), a process accompanied by significant heat release. Chemically, CaO is a strong base that reacts vigorously with acids and amphoteric oxides. In aqueous solutions, it raises pH dramatically. The lump form gradually fractures into smaller particles during hydration, allowing controlled reactivity in industrial processes. Particle size distribution affects reaction rates, with typical lump dimensions ranging from 1-10 cm for handling efficiency.
Main Applications
In steelmaking, lump quicklime serves as a flux to remove impurities (silica, phosphorus) during basic oxygen furnace operations. Its high reactivity with acidic components improves slag formation and metal purity. The construction industry consumes approximately 50% of global production for cement manufacturing, soil stabilization, and mortar preparation. Water treatment plants use CaO for pH adjustment and softening. Environmental applications include flue gas desulfurization in power plants and hazardous waste neutralization. Emerging uses include biodiesel production and as a chemical precursor in calcium-based compounds manufacturing.
Safety and Storage
Lump quicklime requires careful handling due to its corrosive nature and exothermic reaction with moisture. Workers must wear alkali-resistant gloves, face shields, and respiratory protection when dust generation is possible. Storage areas should be dry, well-ventilated, and separated from acids or organic materials. Bulk storage in silos with desiccant systems prevents premature hydration. Smaller quantities are typically packed in moisture-proof bags or drums. Fire risk exists when wetting large quantities due to heat accumulation. First aid measures include immediate flushing of affected areas with copious water for at least 15 minutes.
B2B Procurement Guide
Industrial buyers should specify CaO content (usually 90-95%), impurity limits (MgO, SiO2), and lump size requirements. Verify supplier compliance with ISO or ASTM standards (e.g., ASTM C911 for chemical-grade lime). Packaging options include bulk shipments (railcars, trucks) for large consumers or 25-50 kg bags for smaller operations. Quality checks include reactivity tests and loss-on-ignition measurements. Consider regional suppliers to minimize transport costs for this high-volume commodity. Long-term contracts often provide price stability. Technical support for application-specific recommendations adds value from premium suppliers.
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