Overview
Premium Grade White Lime, chemically known as calcium oxide (CaO), is a high-purity form of quicklime produced by calcining limestone at high temperatures. It is a cornerstone material in industrial and construction sectors due to its versatile chemical properties. The 'premium grade' designation indicates superior quality with minimal impurities, making it suitable for demanding applications. White lime is distinct from hydrated lime (calcium hydroxide) as it retains its reactive oxide form. Its production adheres to strict quality controls to ensure consistency in reactivity and alkalinity, critical for industrial processes. The material is typically supplied in powdered form or as lumps, depending on end-use requirements.
Physical and Chemical Properties
Premium Grade White Lime exhibits a high melting point of 2,572°C and reacts exothermically with water, a process known as slaking. This reaction produces calcium hydroxide and releases significant heat, necessitating careful handling. The compound is insoluble in organic solvents but dissolves in acids, forming corresponding calcium salts. Its alkaline nature (pH ~12.4 in saturated solutions) makes it effective for neutralizing acidic waste streams. The density of 3.34 g/cm³ and white-to-gray appearance are indicative of its mineral origin. Particle size distribution varies by manufacturing process, with finer grades offering faster reaction rates for chemical applications.
Main Applications
In construction, white lime serves as a key component in mortars and plasters, providing workability and long-term durability through carbonation. The metallurgical industry utilizes it as a flux in steelmaking to remove impurities like silica and phosphorus. Environmental applications include pH adjustment in wastewater treatment and flue gas desulfurization. Chemical manufacturers employ white lime to produce calcium stearate, bleaching powder, and other derivatives. Agricultural uses encompass soil pH modification to enhance crop yields. Emerging applications include CO2 capture technologies and as a reagent in biodiesel production, showcasing its industrial versatility.
Safety and Storage
As a corrosive substance, Premium Grade White Lime requires PPE including gloves, goggles, and respirators when handling powdered forms. Moisture-proof packaging (typically multilayer paper bags or super sacks) is essential to prevent premature reaction with atmospheric humidity. Storage areas must be segregated from acids and organic materials. Emergency measures should include ready access to water showers for accidental exposure, though water should not be directly applied to bulk spills due to violent reaction risks. Fire hazards are minimal, but thermal decomposition may release calcium oxide fumes at extremely high temperatures above 2,500°C.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and batch-wise quality reports specifying CaO content, reactivity, and particle size distribution. Bulk shipments (25kg bags or tanker trucks for powdered forms) typically offer better economics for large-scale users. Just-in-time procurement is advisable to minimize storage duration. Technical specifications should align with application needs: construction grades may tolerate 85-90% purity, while chemical processes often require ≥94% CaO. Regional availability of raw limestone affects pricing, with Chinese domestic production commonly offering competitive rates. Contracts should include moisture content guarantees (<1% preferred) and delivery schedules accounting for material sensitivity.
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