Overview
High purity agricultural quicklime (calcium oxide, CaO) is a critical soil amendment used to neutralize acidic soils and enhance nutrient availability for crops. It is produced by calcining limestone at high temperatures, yielding a highly reactive alkaline material. Unlike hydrated lime, quicklime reacts exothermically with water, making it faster-acting but requiring careful handling. Farmers and agronomists prefer high-purity grades (≥90% CaO) for consistent pH adjustment and reduced impurities that could harm soil biology. Its use dates back centuries, but modern agriculture relies on standardized formulations to meet precise soil management needs.
Physical and Chemical Properties
Agricultural quicklime appears as white or grayish lumps or powder with a density of 3.34 g/cm³. It has an exceptionally high melting point (2,572°C) and reacts violently with water to form calcium hydroxide (slaked lime), releasing significant heat. This exothermic reaction necessitates controlled application to avoid plant damage. Its alkalinity (pH ~12.4 when saturated) effectively neutralizes soil acidity, while its hygroscopic nature demands airtight storage. Impurities like magnesium oxide or silica may vary by source, affecting reactivity and application rates.
Main Applications
The primary use is soil pH correction, where quicklime rapidly raises pH in highly acidic soils (pH <5.5), promoting microbial activity and nutrient uptake. It also aids in breaking down organic matter and reducing aluminum toxicity. Beyond agriculture, it serves in wastewater treatment for pH adjustment and sludge stabilization. In poultry farming, it disinfects barns by controlling pathogens and ammonia emissions. Some niche applications include sugar refining and flue gas desulfurization, though industrial grades often differ in specifications.
Safety and Storage
Quicklime is corrosive and requires PPE (gloves, goggles, masks) during handling. Moisture exposure causes thermal burns and generates dust, so storage in moisture-proof bags or silos is essential. NFPA rates it as a Class II hazardous material due to reactivity. Transport regulations vary by region, but generally require UN1910 labeling. Spills should be contained with dry methods; water application exacerbates heat and fumes. Always neutralize residues before disposal to prevent environmental harm.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO or agricultural certification to ensure purity and consistency. Key metrics include CaO content (≥90%), particle size (20-60 mesh for even spreading), and low heavy metal concentrations. Bulk purchases (10+ tons) often reduce costs by 15-30%. Logistics matter: moisture-resistant packaging (lined sacks or bulk containers) prevents degradation during transit. Regional availability affects pricing—coastal areas near limestone quarries typically offer lower freight costs. Seasonal demand (pre-planting periods) may influence lead times.
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