Overview
Hydrated lime granules are a processed form of calcium hydroxide (Ca(OH)₂), created by adding water to quicklime (calcium oxide). This chemical compound has been used for centuries in various industrial applications due to its alkaline properties and reactivity. The granular form offers improved handling characteristics compared to powdered lime, with reduced dust and better flow properties. In modern industrial contexts, hydrated lime granules serve as a crucial material across multiple sectors. Their controlled particle size and consistent quality make them particularly valuable for automated dosing systems in water treatment plants and manufacturing processes. The granules typically range from 1-5mm in diameter, balancing solubility with handling convenience.
Physical and Chemical Properties
Hydrated lime granules exhibit distinct physical and chemical characteristics that determine their industrial utility. Physically, they appear as white to off-white granules with a density approximately 2.21 g/cm³. The granular form significantly reduces dust compared to powdered lime, while maintaining the same chemical properties. Chemically, Ca(OH)₂ is a strong base with a pH of 12.4 in solution. It undergoes two important reactions: carbonation (absorbing CO₂ to form calcium carbonate) and pozzolanic reactions (with silica/alumina in construction materials). The compound decomposes at 580°C rather than boiling, making it stable for most industrial temperature ranges. Its slight water solubility (1.65 g/L) allows for controlled reactivity in aqueous applications.
Main Applications
Water treatment represents the largest application for hydrated lime granules, where they adjust pH, remove heavy metals, and soften water. Municipal plants favor the granular form for its precise dosing capabilities in automated systems. The construction industry utilizes these granules in mortar, plaster, and soil stabilization, where they improve workability and long-term strength development. In agriculture, farmers apply hydrated lime granules to neutralize acidic soils, with the granular form allowing for even distribution. The chemical industry employs them as a cost-effective alkaline reagent in various processes, including the production of calcium stearate and other calcium compounds. Emerging applications include flue gas treatment and wastewater remediation, where their controlled reactivity proves advantageous.
Safety and Storage
Proper handling of hydrated lime granules requires attention to safety protocols. While the granular form reduces dust exposure compared to powders, the material remains alkaline and can cause skin irritation or eye damage. Workers should wear protective gloves, goggles, and respiratory protection when handling large quantities or in confined spaces. Storage conditions significantly impact product quality. Granules must be kept in dry environments below 40°C, preferably in original sealed bags or silos with desiccants. Moisture absorption leads to caking and partial conversion to calcium carbonate, reducing reactivity. For long-term storage (over 6 months), nitrogen blanketing or other moisture exclusion methods may be necessary, especially in humid climates.
B2B Procurement Guide
Industrial buyers should evaluate several factors when procuring hydrated lime granules. Purity specifications typically range from 90-95% Ca(OH)₂, with the remainder being calcium carbonate and inert materials. Request certificates of analysis (CoA) for each batch, verifying composition and heavy metal content. Packaging options include 25kg bags, big bags (1 metric ton), and bulk deliveries for large-scale users. Consider transportation costs - while granules have better flow properties than powder, they still require protection from moisture during transit. Establish supplier quality audits, particularly checking for consistent granule size distribution (typically 1-5mm) and low fines content (particles <0.5mm should be <5%).
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