Overview
90% purity quicklime blocks consist primarily of calcium oxide (CaO), produced by calcining limestone at 900-1,200°C. This industrial-grade material is valued for its high chemical reactivity and cost-effectiveness in bulk applications. The 90% purity specification indicates a minimum CaO content, with typical impurities including magnesium oxide, silica, and aluminum oxide. It's commonly supplied in irregular lumps (5-15cm) for controlled reactivity in industrial processes.
Physical and Chemical Properties
Quicklime blocks exhibit extreme hygroscopicity, rapidly absorbing moisture from air to form calcium hydroxide. Their exothermic reaction with water (ΔH = -63.7 kJ/mol) makes them valuable for heat generation applications. The material has a Mohs hardness of 3-4 and thermal stability up to 2,500°C. Its high alkalinity (pH 12.4 in saturated solution) enables effective acid neutralization. Particle size distribution affects reaction rates - larger blocks provide slower, controlled reactivity compared to powdered forms.
Main Applications
In steelmaking, quicklime blocks serve as flux to remove impurities (slag formation). Their 90% purity strikes a balance between cost and performance for basic oxygen furnaces. Environmental applications include flue gas desulfurization (FGD) in power plants, where they react with SO2. Construction uses include soil stabilization and mortar production, while water treatment facilities employ them for pH adjustment and phosphate removal.
Safety and Storage
Quicklime requires Class 8 corrosive material labeling. Storage silos must have moisture-proof ventilation and temperature monitoring to prevent spontaneous heating. Emergency protocols should address eye/skin contact (flush with water for 15+ minutes) and inhalation risks (use NIOSH-approved P100 respirators). Firefighting requires dry chemical agents - water application causes violent steam explosions.
B2B Procurement Guide
Industrial buyers should request certified assay reports verifying CaO content, reactivity (measured by T60 slaking test), and impurity profiles. Bulk shipments typically use moisture-resistant woven polypropylene bags (1-ton capacity) or dedicated bulk tankers. Consider regional availability when negotiating contracts, as transportation costs often exceed 30% of product value. Just-in-time delivery minimizes storage risks, with ideal inventory turnover under 30 days.
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