Overview
Hydrated lime powder is a versatile chemical compound derived from quicklime (calcium oxide) through a controlled hydration process. It has been used for centuries in construction and industrial applications due to its alkaline properties and binding capabilities. In modern industries, hydrated lime powder is valued for its role in pH adjustment, flue gas desulfurization, and soil stabilization. Its fine particle size ensures uniform mixing in various formulations, making it indispensable in sectors like construction, water treatment, and agriculture.
Physical and Chemical Properties
Hydrated lime powder is characterized by its high alkalinity (pH ~12.4) and exothermic reaction when mixed with water. It gradually reacts with carbon dioxide in the air to form calcium carbonate, a process known as carbonation. The powder's low solubility in water (1.73 g/L at 20°C) makes it suitable for slow-release applications, such as soil amendment. Its thermal stability allows it to withstand temperatures up to 580°C before decomposing into calcium oxide and water vapor.
Main Applications
In construction, hydrated lime powder is a key ingredient in mortars and plasters, improving workability and reducing cracking. It is also used as a binder in autoclaved aerated concrete (AAC) blocks. Environmental applications include wastewater treatment for pH adjustment and heavy metal removal. In agriculture, it serves as a soil conditioner to neutralize acidic soils. The chemical industry utilizes it in the production of calcium stearate, bleaching powder, and other specialty chemicals.
Safety and Storage
As a caustic material, hydrated lime powder requires careful handling. Direct contact can cause skin irritation or severe eye damage. Always use gloves, goggles, and dust masks during handling. Store in moisture-proof bags or sealed containers to prevent premature carbonation. Bulk storage silos should have humidity controls. Keep away from acids and organic materials to avoid violent reactions. Spills should be neutralized with weak acids like vinegar before cleanup.
B2B Procurement Guide
When sourcing hydrated lime powder, prioritize suppliers with ISO 9001 certification and consistent quality control. Key specifications to verify include calcium hydroxide content (typically 90-95%), particle size distribution (80-100 mesh for most applications), and absence of impurities like magnesium compounds. For large-scale procurement, consider bulk purchasing with railcar or tanker delivery to reduce costs. Negotiate contracts with flexibility for periodic quality testing. Regional suppliers often offer better logistics for construction projects, while specialized chemical providers may be needed for high-purity industrial applications.
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