Overview
Calcium hydroxide powder, commonly referred to as slaked lime, is a versatile chemical compound produced by hydrating quicklime (calcium oxide). It has been used for centuries in construction and agriculture due to its alkaline properties and binding capabilities. In modern industries, it serves as a cost-effective material for pH adjustment, flocculation, and chemical synthesis. As a fine white powder, it offers high surface area for reactions, making it efficient for industrial processes. Its production involves careful control of the slaking process to achieve optimal particle size and reactivity. The powder form is preferred for many applications due to its ease of handling and uniform dispersion properties.
Physical and Chemical Properties
Calcium hydroxide powder exhibits distinct physical and chemical characteristics that determine its industrial applications. Physically, it appears as a fine, odorless white powder with a density of 2.21 g/cm³. The powder form provides excellent coverage and mixing properties, which are crucial for construction applications. Chemically, it is a strong base with a pH of 12.4 in saturated solutions. It reacts with acids to form salts and water, and gradually absorbs carbon dioxide from air to form calcium carbonate. The compound decomposes at 580°C without melting. Its slight solubility in water (1.65 g/L) produces a limewater solution that finds use in various chemical tests and treatments.
Main Applications
The construction industry accounts for the majority of calcium hydroxide powder consumption, where it serves as a key ingredient in mortars, plasters, and whitewash. Its ability to harden through carbonation makes it valuable for traditional building techniques. In modern construction, it's often blended with cement to improve workability and reduce cracking. Water treatment plants utilize the powder for pH adjustment and heavy metal removal. In agriculture, it corrects soil acidity and provides calcium nutrients. The chemical industry employs it in the production of calcium stearate, bleaching powder, and other calcium compounds. Emerging applications include flue gas desulfurization and food processing (as a pH regulator).
Safety and Storage
As an alkaline substance, calcium hydroxide powder requires careful handling to prevent health risks. Workers should wear appropriate PPE including gloves, goggles, and dust masks to avoid skin contact, eye irritation, or respiratory issues. The powder can cause chemical burns in moist conditions and should be immediately washed off if contact occurs. Proper storage involves keeping the material in moisture-proof containers or bags in a dry, well-ventilated area. Exposure to air should be minimized to prevent carbonation, which reduces reactivity. Containers should be clearly labeled and stored away from acids and other incompatible chemicals. Bulk storage silos should have moisture control systems for optimal preservation.
B2B Procurement Guide
When procuring calcium hydroxide powder for industrial use, buyers should prioritize suppliers who can provide consistent quality and reliable delivery. Key specifications to verify include purity (typically 90-95%), particle size distribution (important for reactivity), and moisture content (should be below 2%). Consider packaging options based on usage volume - 25kg bags for smaller operations or bulk tanker deliveries for large-scale consumers. Request material safety data sheets (MSDS) and certificates of analysis for each batch. Evaluate suppliers based on their production capacity, quality control processes, and ability to meet your delivery schedule. Many manufacturers offer technical support for application-specific formulations.
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