Overview
Lime slurry is a versatile alkaline suspension formed by mixing calcium hydroxide (hydrated lime) with water. It has been used for centuries in construction (e.g., lime mortar) and remains critical in modern industrial processes due to its cost-effectiveness and reactivity. The slurry typically contains 15-40% solids by weight, with particle sizes under 10 micrometers for optimal suspension stability. In B2B contexts, lime slurry is commonly supplied ready-mixed in tanker trucks or produced on-site using slaking systems. Its preparation requires precise control of water-to-lime ratios and mixing conditions to achieve desired viscosity and prevent sedimentation during storage or transport.
Physical and Chemical Properties
As a colloidal suspension, lime slurry exhibits non-Newtonian fluid characteristics, with viscosity dependent on shear rate and solids concentration. Its alkalinity (pH ~12.4) makes it effective for neutralization reactions, while the fine particle size provides large surface area for rapid chemical interactions. Key reactions include carbonation (forming calcium carbonate when exposed to CO₂) and sulfation (reacting with SO₂ in flue gas treatment). The slurry's stability is temperature-sensitive—cold conditions slow settling but may increase viscosity, while heat accelerates carbonation. Additives like lignosulfonates are often incorporated to improve pumpability and reduce sedimentation in industrial applications.
Main Applications
In water treatment, lime slurry adjusts pH, removes heavy metals via precipitation, and softens water by removing carbonate hardness. Municipal plants use it for sludge conditioning, while industries employ it for acidic wastewater neutralization. Flue gas desulfurization (FGD) systems in power plants consume large volumes, where slurry reacts with SO₂ to form gypsum. Construction uses include soil stabilization (particularly for clay soils) and as an ingredient in specialty mortars. Emerging applications include CO₂ capture technologies and as a low-cost alkali in biorefineries.
Safety and Storage
Lime slurry requires careful handling due to its corrosive nature. Workers should wear chemical-resistant gloves, goggles, and face shields when handling. Proper ventilation is essential to prevent exposure to mist, which can cause respiratory irritation. Storage systems must prevent carbonation—sealed tanks with CO₂ scrubbers are ideal for long-term storage. Agitation systems or recirculation pumps maintain homogeneity. For outdoor storage in cold climates, insulation or heating may be necessary to prevent freezing, which can damage equipment and alter slurry properties.
B2B Procurement Guide
Industrial buyers should specify: 1) Calcium hydroxide content (typically 90-95% purity), 2) Solids concentration (20-35% common for transport), 3) Viscosity range (usually 500-2,000 cP), and 4) Presence of anti-settling agents. Bulk shipments require verification of tanker cleanliness to prevent contamination. For large-scale users, on-site slaking systems may be cost-effective, requiring procurement of quicklime (CaO) and slaking equipment. Key suppliers include Carmeuse, Lhoist, and Mississippi Lime. Pricing is typically volume-dependent, with contracts often including transportation and storage solutions.
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