Overview
Multifunctional lime powder, chemically known as calcium hydroxide (Ca(OH)₂), is a versatile alkaline compound derived from limestone. It has been used for centuries in various industries due to its chemical properties and cost-effectiveness. The powder form allows for easy handling and application in multiple processes. In modern applications, lime powder serves as a crucial material in construction (mortar, plaster), environmental protection (flue gas treatment, water purification), and agriculture (soil amendment). Its multifunctionality stems from its ability to neutralize acids, absorb moisture, and participate in chemical reactions.
Physical and Chemical Properties
Multifunctional lime powder appears as a fine white powder with a density of approximately 2.2 g/cm³. It decomposes at 580°C into calcium oxide and water. The compound is slightly soluble in water (1.73 g/L at 20°C), forming a solution known as limewater, which exhibits strong alkalinity (pH 12.4). Key chemical properties include its reactivity with acids to form salts (neutralization), carbon dioxide absorption (carbonation), and pozzolanic reactions in construction materials. These characteristics make it valuable for pH adjustment, chemical synthesis, and binding applications. The powder's fineness (typically 200-400 mesh) enhances its reactivity and dispersion in various media.
Main Applications
In construction, lime powder is essential for producing mortars, plasters, and whitewash due to its binding properties and workability enhancement. It reacts with atmospheric CO₂ to harden over time (carbonation). The water treatment industry uses it for pH adjustment, heavy metal removal, and sludge conditioning. Agricultural applications include soil pH modification to optimize crop growth conditions and as a calcium supplement. Industrial uses span chemical manufacturing (bleaching powder production), food processing (corn treatment), and environmental applications (flue gas desulfurization). Emerging applications include wastewater treatment and stabilization of hazardous wastes.
Safety and Storage
As an alkaline material, lime powder requires careful handling to prevent skin irritation, eye damage, or respiratory issues. Personnel should wear protective gloves, goggles, and dust masks during handling. In case of contact, affected areas should be rinsed immediately with plenty of water. Storage must be in dry, well-ventilated areas away from acids and moisture. Use airtight containers or moisture-proof bags to prevent caking. Bulk storage silos should have proper aeration to maintain powder flowability. The material is non-flammable but can react exothermically with water in large quantities.
B2B Procurement Guide
When procuring lime powder commercially, verify the calcium hydroxide content (typically 90-95% for industrial grade) through certified lab analysis. Check for impurities like magnesium compounds or unreacted calcium oxide that may affect performance. Packaging options include 25kg bags, big bags (1 ton), or bulk tankers for large quantities. Reliable suppliers should provide material safety data sheets (MSDS) and certificates of analysis. Consider logistics factors - moisture-proof transportation is essential. For specialized applications (food-grade or high-purity), request additional documentation and ensure compliance with relevant industry standards (ASTM C206 for finishing hydrated lime).
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