Overview
Lump Building Lime, primarily calcium oxide (CaO), is a fundamental material in construction and industrial processes. Produced by calcining limestone at high temperatures, it has been used for centuries due to its binding and stabilizing properties. In modern construction, it serves as a key ingredient in mortars and plasters, offering workability and breathability. Unlike hydrated lime, lump lime requires slaking (mixing with water) before use, which generates significant heat and must be handled carefully.
Physical and Chemical Properties
Lump Building Lime appears as hard, white or grayish lumps with a high melting point (2572°C). Its density of 3.34 g/cm³ makes it heavier than hydrated lime variants. The material is hygroscopic, readily absorbing moisture from the air, which can lead to premature slaking if stored improperly. Chemically, CaO reacts exothermically with water to form calcium hydroxide (slaked lime). This reaction is crucial for its applications but requires controlled conditions. The compound also reacts with carbon dioxide over time, reverting to calcium carbonate—a process called carbonation that strengthens lime-based mortars.
Main Applications
In construction, Lump Building Lime is primarily used for traditional lime mortar and plaster, especially in heritage restoration where its vapor permeability prevents moisture trapping. It’s also employed in soil stabilization for road bases, where it reduces plasticity and improves load-bearing capacity. Industrial uses include steel manufacturing (as a flux to remove impurities), water treatment (pH adjustment), and flue gas desulfurization. In agriculture, it serves as a soil amendment to reduce acidity, though powdered forms are more common for this purpose.
Safety and Storage
Due to its caustic nature, Lump Building Lime requires PPE (gloves, goggles, respirators) during handling. Moisture exposure can cause violent exothermic reactions, so storage in dry, sealed containers is critical. Bulk storage should avoid contact with organic materials to prevent fire risks from spontaneous heating. First aid for skin contact involves immediate flushing with water (never neutralization). Spills should be contained with inert absorbents like sand, not water. Transport regulations often classify it as a Class 8 corrosive material, requiring appropriate labeling.
B2B Procurement Guide
When sourcing Lump Building Lime, prioritize suppliers with ISO 9001 certification and consistent CaO content testing (typically 85-95% purity). Packaging should be moisture-proof, with palletized bags or bulk silos for large quantities. Pricing depends on production scale (kiln vs. rotary furnace), regional availability of limestone, and transport costs. For construction projects, verify compatibility with local sand aggregates through trial mixes. Lead times may vary seasonally due to calcination energy requirements.
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