Overview
Quicklime, or calcium oxide (CaO), is a fundamental industrial chemical produced by calcining limestone (calcium carbonate) at high temperatures. Small-particle quicklime (typically 1-10 mm) offers enhanced reactivity due to its larger surface area compared to lump lime. It has been used since antiquity for mortar production and remains critical in modern industries like metallurgy and environmental remediation. In B2B contexts, small-particle quickline is favored for processes requiring rapid reaction kinetics, such as flue gas desulfurization or pH adjustment in wastewater treatment. Its granular form facilitates controlled dosing in industrial applications, reducing waste and improving efficiency.
Physical and Chemical Properties
Small-particle quicklime shares the same chemical composition as standard CaO but features distinct physical characteristics. The granular form exhibits a bulk density of approximately 0.9-1.3 g/cm³, with porosity affecting its reactivity. When exposed to air, it gradually absorbs moisture and carbon dioxide, converting to calcium hydroxide and carbonate. Thermodynamically, the reaction with water releases 1,150 kJ/kg of heat, making it valuable for exothermic processes but requiring careful handling. The material’s high melting point (2,572°C) ensures stability in extreme conditions, while its alkalinity (pH ~12.4 in slurry form) drives many industrial applications.
Main Applications
In steelmaking, small-particle quicklime serves as a flux to remove impurities like silica and phosphorus, with its granular form ensuring even distribution in converters. Environmental applications include acidic wastewater neutralization, where its rapid dissolution is advantageous. The construction sector uses it for soil stabilization, particularly in roadbeds, where it reduces plasticity and improves load-bearing capacity. Agricultural uses comprise soil pH modification to enhance crop yields, with small particles ensuring uniform field distribution. Emerging applications include CO₂ capture technologies and as a reagent in chemical synthesis, such as calcium stearate production for plastics.
Safety and Storage
Due to its corrosive nature and exothermic reaction with moisture, small-particle quicklime requires strict safety protocols. Workers must wear alkali-resistant gloves, goggles, and respiratory protection when handling. Storage silos or drums should be moisture-proof, with humidity levels below 50% to prevent premature slaking. Spills should be contained using dry methods (e.g., sweeping), as water application can cause violent reactions. Facilities must have emergency showers and acid wash stations (e.g., diluted vinegar) to treat skin contact. Transportation regulations typically classify it as a Class 8 (corrosive) material.
B2B Procurement Guide
When sourcing small-particle quicklime, prioritize suppliers providing certified CaO content analysis (≥90% for most industrial uses). Key specifications include particle size distribution (e.g., 90% passing 5 mm sieve), reactivity rate (measured by slaking speed), and impurity profiles (e.g., MgO, SiO₂ limits). Bulk purchases (20+ metric tons) often reduce costs by 15-30%. Consider regional suppliers to minimize transport hazards, and verify packaging integrity—multi-layer kraft paper bags with polyethylene liners are industry standard. For large-scale users, silo delivery systems with pneumatic conveying may optimize handling.
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