Overview
High reactivity quicklime powder is a finely ground form of calcium oxide (CaO) produced by calcining limestone at high temperatures. It is characterized by its rapid reaction with water, making it valuable in processes requiring fast lime hydration. The powder form increases surface area, enhancing its reactivity compared to larger lime particles. Industrially, high reactivity quicklime powder is distinguished from regular quicklime by its finer particle size distribution (typically 80-200 mesh) and higher available lime content. This makes it particularly suitable for applications where rapid and complete reaction is essential, such as in flue gas treatment or soil stabilization.
Physical and Chemical Properties
The physical properties of high reactivity quicklime powder include a white to grayish appearance and a density of approximately 3.34 g/cm³. Its fine particle size contributes to a large surface area, which is crucial for its high reactivity. The powder has a melting point of 2,572°C and boiling point of 2,850°C, though it typically reacts before reaching these temperatures in most applications. Chemically, CaO is a strong base that reacts exothermically with water to form calcium hydroxide (slaked lime). This reaction is highly exothermic, releasing about 1,150 BTU per pound of quicklime. The powder's alkalinity (pH ~12.4 in solution) makes it effective for neutralization processes. Its reactivity is measured by the time required to reach maximum temperature when mixed with water, with high-grade powders achieving this in under 3 minutes.
Main Applications
In construction, high reactivity quicklime powder is used for soil stabilization, particularly in road construction where its rapid reaction helps modify clay soils. It's also essential in producing aerated concrete blocks and as a component in dry mortar mixes. The metallurgical industry uses it as a flux in steel production to remove impurities. Environmental applications include flue gas desulfurization (FGD) in power plants, where its reactivity allows efficient sulfur dioxide removal. In water treatment, it adjusts pH and precipitates contaminants. The chemical industry utilizes it in producing calcium stearate, bleaching powder, and other calcium compounds. Recent developments include use in sustainable construction materials and carbon capture technologies.
Safety and Storage
High reactivity quicklime powder requires careful handling due to its corrosive nature. Personnel should wear protective equipment including gloves, goggles, and dust masks to prevent contact with skin, eyes, or respiratory system. Moisture exposure must be minimized as the exothermic reaction with water can generate enough heat to ignite combustible materials. Storage should be in moisture-proof containers or silos with desiccants. Bulk storage requires dry, well-ventilated areas with concrete floors (not wood). The powder should be kept separate from acids and organic materials. Shelf life is typically 6-12 months when properly stored, though reactivity may decrease over time due to atmospheric carbonation forming calcium carbonate.
B2B Procurement Guide
When procuring high reactivity quicklime powder, buyers should specify required parameters including CaO content (typically 90-95%), reactivity rate, particle size distribution, and magnesium oxide content. Packaging options range from 25kg moisture-resistant bags to bulk tanker deliveries for large consumers. Quality verification should include certificates of analysis for chemical composition and reactivity tests. Consider suppliers' ability to provide consistent quality and technical support. Logistics planning is crucial - the powder is sensitive to moisture during transport. For international shipments, ensure compliance with IMDG Class 8 (corrosive substances) regulations. Establish long-term contracts with reputable manufacturers to secure stable pricing, as lime markets can fluctuate with raw material and energy costs.
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