Overview
Multi-purpose lime powder, chemically known as calcium hydroxide, is a white crystalline solid produced by slaking quicklime (calcium oxide) with water. This versatile compound has been used for centuries in various applications due to its alkaline properties and reactivity. In modern industries, lime powder serves as a cost-effective solution for pH adjustment, chemical synthesis, and construction purposes. Its production typically follows strict quality control measures to ensure consistency in particle size and chemical composition.
Physical and Chemical Properties
The powder exhibits a fine, dry consistency with a density of approximately 2.21 g/cm³. While it has limited solubility in water, it forms a strongly alkaline solution (pH 12.4 at 25°C for saturated solution) known as limewater. The compound gradually absorbs carbon dioxide from air, converting back to calcium carbonate. Thermally, lime powder decomposes at about 580°C without melting. Its chemical reactivity makes it valuable for neutralization reactions, particularly in wastewater treatment and flue gas desulfurization processes.
Main Applications
In construction, lime powder is essential for making mortar and plasters, improving workability and durability. The agricultural sector uses it extensively for soil amendment to correct acidity and provide calcium nutrients to crops. Industrial applications include water treatment (pH adjustment and softening), chemical manufacturing (precursor for other calcium compounds), and food processing (traditional corn treatment in tortilla making). Environmental uses encompass acid neutralization in mining and flue gas treatment.
Safety and Storage
As an alkaline material, lime powder requires careful handling. Workers should wear protective gloves, goggles, and dust masks to prevent skin irritation or respiratory issues. First aid measures include flushing affected areas with plenty of water. Proper storage involves keeping the powder in moisture-resistant containers or bags in a dry warehouse. Bulk storage silos should be equipped with proper ventilation to prevent dust accumulation and moisture ingress that could lead to caking.
B2B Procurement Guide
Industrial buyers should specify technical parameters including purity level (typically 90-95% Ca(OH)2), particle size distribution (usually 200-400 mesh), and moisture content (<2%). Packaging options range from 25kg bags to bulk tanker trucks for large-scale users. Quality certifications to look for include ISO standards and food-grade approvals if intended for edible applications. Consider proximity of suppliers to reduce transportation costs, as lime is a relatively low-value, high-volume commodity.
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