Overview
Industrial calcium hydroxide slurry is an aqueous suspension of calcium hydroxide (Ca(OH)₂), commonly called slaked lime or hydrated lime. It is produced by mixing quicklime (CaO) with water in controlled exothermic reactions. The slurry form offers advantages over dry lime in handling and reactivity. As a cost-effective alkali, it plays critical roles in neutralization processes across industries. Its fine particle size in slurry form enhances reaction efficiency, making it preferable for applications like pH adjustment in water treatment or sulfur capture in emissions control.
Physical and Chemical Properties
The slurry appears as a white, milky fluid with viscosity dependent on solids content (typically 15-40%). Its high pH (~12.4) provides strong alkalinity for acid neutralization. When exposed to air, it gradually reacts with CO₂ to form calcium carbonate (carbonation). Key reactions include acid neutralization (e.g., Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O) and flue gas desulfurization (SO₂ removal). The slurry's reactivity is temperature-dependent, with optimal performance between 10-40°C. Settling may occur during storage, requiring agitation before use.
Main Applications
In water treatment, the slurry adjusts pH, removes heavy metals via precipitation, and softens hard water. Environmental applications include flue gas desulfurization (FGD) in power plants, where it captures SO₂ emissions. The construction industry uses it for soil stabilization and mortar preparation. Agricultural applications include soil pH correction and as a fungicide. Emerging uses involve wastewater phosphate removal and biogas purification. Its versatility stems from controllable dosing and rapid reaction kinetics in slurry form.
Safety and Storage
As a corrosive material, PPE (gloves, goggles) is mandatory during handling. Skin contact causes irritation; rinse immediately with water. Store in HDPE or stainless steel tanks with agitators to prevent settling and carbonation. Avoid aluminum or galvanized containers due to alkali reactivity. Shelf life is typically 6-12 months if properly sealed. Transport as non-hazardous material in most regions, but verify local regulations. Spills should be contained and neutralized with weak acids like vinegar.
B2B Procurement Guide
Buyers should specify solids concentration, purity (typically 90-95% Ca(OH)₂), and viscosity requirements. Bulk shipments (tankers or IBCs) reduce costs for large-scale users. Verify supplier compliance with ISO or industry standards like AWWA. Sample testing for impurities (e.g., silica, magnesium) is recommended. Consider proximity to minimize transport costs, as slurry is heavy. Contracts often include clauses for consistency in particle size distribution and reactivity metrics. Pilot testing ensures compatibility with existing systems.
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