Overview
Ultrafine lime refers to calcium oxide (quicklime) or calcium hydroxide (hydrated lime) processed into particles smaller than 10 microns. Its production involves advanced grinding or precipitation techniques to achieve high surface area and reactivity. Compared to conventional lime, ultrafine variants offer faster reaction rates and better dispersion in applications like construction and environmental remediation. This material is favored in industries requiring precise pH control or rapid chemical interactions, such as wastewater treatment and steel manufacturing. Its purity and consistency make it a critical raw material in specialized B2B supply chains.
Physical and Chemical Properties
Ultrafine lime exhibits distinct properties due to its reduced particle size. The high surface area-to-volume ratio enhances its reactivity with acids, water, and CO₂. For example, hydrated lime (Ca(OH)₂) dissolves more readily in water, forming alkaline solutions used in pH adjustment. Thermal stability varies: quicklime (CaO) withstands extreme temperatures, while hydrated lime decomposes above 580°C. Both forms are hygroscopic and require dry storage to prevent caking or unintended slaking (reaction with moisture). Particle size analysis (e.g., laser diffraction) is essential to ensure compliance with industry specifications.
Main Applications
In construction, ultrafine lime improves mortar workability and reduces cracking in cement blends. It accelerates carbonation, enhancing durability. Environmental applications include flue gas desulfurization (FGD), where it neutralizes sulfur oxides in industrial emissions. Agriculture benefits from its use in soil pH correction and as a calcium supplement. Water treatment plants employ it for heavy metal precipitation and phosphorous removal. Emerging uses include filler material in plastics and paper, leveraging its whiteness and fine texture.
Safety and Storage
Ultrafine lime poses risks due to its alkaline nature and dust formation. Direct contact can cause skin burns or eye damage, necessitating PPE like nitrile gloves and dust masks. Storage in moisture-proof bags or silos is critical to prevent degradation. Spills should be neutralized with weak acids (e.g., vinegar) and cleaned promptly. Ventilation is mandatory in handling areas to avoid airborne particle accumulation. Regulatory guidelines (e.g., OSHA, REACH) outline exposure limits and labeling requirements.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO-certified production facilities and batch-specific COAs (Certificates of Analysis). Key metrics include CaO content (≥95%), chloride/sulfate limits (<0.1%), and particle size distribution (D90 < 15µm). Bulk shipments (25-ton bags or tanker trucks) reduce costs for large-scale consumers. Regional availability of raw limestone and processing capacity may influence pricing. Negotiate contracts with penalties for off-spec deliveries, especially for critical applications like FGD.
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