Overview
Multifunctional quicklime granules, chemically known as calcium oxide (CaO), are a high-purity form of burnt lime processed into granular form for ease of handling and application. They are produced by calcining limestone at high temperatures, driving off carbon dioxide to leave behind reactive CaO. The granular form reduces dust and improves controlled release in industrial processes. Quicklime granules are valued for their versatility across industries, including construction, agriculture, and environmental management. Their high reactivity with water and ability to adjust pH make them indispensable in applications ranging from soil stabilization to flue gas treatment. The granular form also enhances safety by minimizing airborne particles during handling.
Physical and Chemical Properties
Quicklime granules exhibit a white to grayish appearance, with a density of approximately 3.34 g/cm³. They have an exceptionally high melting point of 2613°C and react exothermically with water, producing calcium hydroxide (slaked lime). This reaction releases significant heat, making it useful for applications requiring thermal energy. The granules are highly alkaline (pH ~12.4) and hygroscopic, rapidly absorbing moisture from the air. This property necessitates airtight storage to prevent premature reaction. Their solubility in water is technically negligible as they chemically convert to hydroxide, but this reactivity is leveraged in processes like wastewater neutralization.
Main Applications
In construction, quicklime granules are used for soil stabilization, particularly in roadbed preparation, where they reduce plasticity and improve load-bearing capacity. They also serve as a key ingredient in mortar and plaster formulations. The agricultural sector utilizes them for pH adjustment in acidic soils and as a calcium supplement for crops. Industrial applications include flue gas desulfurization, where granules neutralize sulfur oxides, and water treatment for heavy metal removal. Their desiccant properties make them effective in drying processes for solvents or gases. Emerging uses include biofuel production and as a chemical reagent in metallurgy.
Safety and Storage
Quicklime granules require careful handling due to their corrosive nature. Direct contact can cause severe skin burns or eye damage, necessitating PPE like gloves, goggles, and dust masks. Storage must be in moisture-proof containers, ideally with desiccants, in cool, dry areas separate from acids or organic materials. Spills should be contained with inert absorbents, never water, due to the exothermic reaction. Facilities should have eye wash stations and acid-neutralizing solutions available. Transportation requires UN1910 labeling as a Class 8 corrosive material, with proper ventilation to prevent dust accumulation.
B2B Procurement Guide
When procuring quicklime granules, prioritize suppliers with ISO 9001 certification and batch-specific Certificates of Analysis confirming ≥90% CaO content. Packaging options include 25kg moisture-resistant bags or bulk supersacks with palletized delivery for large quantities. Key evaluation metrics include reactivity rate (measured by slaking speed) and granule size consistency (typically 2-5mm). Consider regional suppliers to minimize transportation costs, as bulk shipping significantly impacts pricing. Negotiate contracts with flexibility for seasonal demand fluctuations, especially for agricultural applications. Always request Material Safety Data Sheets (MSDS) and conduct supplier audits for consistent quality assurance.
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