High-grade Quicklime Lump
Overview
High-grade Quicklime Lump is a premium form of calcium oxide (CaO) produced by calcining limestone at high temperatures. It is distinguished by its high purity (>90% CaO) and low levels of impurities like silica and magnesium oxide. The lump form ensures slower reactivity compared to powdered variants, making it ideal for controlled industrial processes. Primarily sourced from natural limestone deposits, its production involves strict quality control to meet industry standards. The material is widely traded in bulk quantities for large-scale applications, with key suppliers located in regions with abundant limestone reserves.
Physical and Chemical Properties
High-grade Quicklime Lump exhibits a crystalline structure with a high melting point (2,572°C) and density (3.34 g/cm³). It reacts vigorously with water (hydration), releasing heat and forming calcium hydroxide. This exothermic reaction is leveraged in applications requiring heat generation or pH adjustment. The material is insoluble in organic solvents but reacts with acids to form salts. Its thermal stability and low volatility make it suitable for high-temperature processes, such as steelmaking. Impurities are minimized to ensure consistent performance, with typical specifications requiring ≤5% combined impurities.
Main Applications
In steelmaking, High-grade Quicklime Lump is used as a flux to remove impurities like phosphorus and sulfur. Its high reactivity with acidic oxides improves slag formation and metal purity. The construction industry utilizes it in mortar and plaster due to its binding properties and durability. Chemical industries employ it for pH adjustment in wastewater treatment and as a precursor in calcium-based compounds (e.g., calcium carbide). Additional uses include soil stabilization in agriculture and flue gas desulfurization in power plants. The lump form is preferred for slow-release applications, such as landfill leachate treatment.
Safety and Storage
Quicklime is highly corrosive and requires careful handling. Personal protective equipment (PPE), including gloves, goggles, and respirators, is mandatory to prevent burns or inhalation hazards. Storage must be in dry, sealed containers to avoid moisture absorption, which can lead to caking or unintended heat generation. Spills should be neutralized with dry sand or vermiculite, not water, to prevent violent reactions. Facilities must ensure adequate ventilation to disperse any dust generated during handling. Transport regulations classify it as a Class 8 corrosive material, requiring hazard labels and non-reactive packaging.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO certification and batch-specific purity analysis. Key procurement criteria include CaO content (≥90%), lump size uniformity (typically 10–50 mm), and low residual CO₂ levels. Packaging options range from moisture-proof bags to bulk silos, depending on volume requirements. Regional pricing varies based on logistics and local demand. Long-term contracts often include quality clauses and delivery schedules to ensure supply chain stability. Buyers in water-sensitive applications may request additional testing for reactivity rates or impurity profiles.
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