Overview
Hydrated lime powder, chemically known as calcium hydroxide (Ca(OH)2), is produced by slaking quicklime (calcium oxide) with water. This process results in a fine, white powder that has been used for centuries in various applications due to its alkaline properties. Unlike quicklime, hydrated lime is less reactive and easier to handle, making it suitable for precise industrial and construction applications. It is a key material in traditional building techniques and modern industrial processes alike.
Physical and Chemical Properties
Hydrated lime powder appears as a white, odorless powder with a density of approximately 2.21 g/cm³. It has poor solubility in water (1.73 g/L at 20°C), forming a suspension known as limewater when mixed. The compound decomposes at 580°C, losing water to revert to calcium oxide. It reacts exothermically with acids and gradually absorbs carbon dioxide from air to form calcium carbonate, a process called carbonation that is useful in construction applications.
Main Applications
In construction, hydrated lime is essential for making mortar and plaster, improving workability and durability. It's also used in soil stabilization for road construction and as a binder in masonry products. Environmental applications include water treatment for pH adjustment and heavy metal removal, and flue gas treatment to remove acidic pollutants. In agriculture, it serves as a soil amendment to neutralize acidity and provide calcium nutrients.
Safety and Storage
Hydrated lime requires careful handling due to its alkaline nature (pH ~12.4). Direct contact can cause skin and eye irritation or burns. Proper PPE including gloves, goggles, and dust masks should be used when handling the powder. Storage should be in moisture-proof containers or silos to prevent caking. The material should be kept separate from acids and ammonium salts, as hazardous reactions may occur. Shelf life is typically 6-12 months when stored properly.
B2B Procurement Guide
Industrial buyers should specify purity requirements (typically 90-95% Ca(OH)2), particle size distribution, and reactivity characteristics based on application needs. Packaging options range from 25kg bags to bulk tanker trucks for large-scale users. Quality certifications to look for include ISO 9001 and material safety data sheets (MSDS). Leading producing regions include China, the United States, and Europe. Prices fluctuate based on energy costs and seasonal demand in construction sectors.
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