Overview
Calcium hydroxide (Ca(OH)₂) is the industrial-grade hydrated lime specifically formulated for flue gas desulfurization (FGD) processes. Unlike food-grade variants, FGD lime prioritizes high reactivity with sulfur dioxide (SO₂) and consistent particle size distribution for efficient slurry formation. In wet scrubber systems, it neutralizes acidic gases by forming calcium sulfite/sulfate precipitates. The global FGD lime market exceeds 20 million tons annually, driven by environmental regulations like China's Ultra-Low Emissions standards and the EU Industrial Emissions Directive.
Physical and Chemical Properties
FGD-grade calcium hydroxide exhibits a fine powder morphology (typically 200-325 mesh) to maximize surface area for gas-liquid reactions. Its alkaline nature (pH 12.4 in saturated solution) enables effective SO₂ absorption, with theoretical consumption of 1.15kg Ca(OH)₂ per kg SO₂ removed. Key reaction pathways include the formation of calcium sulfite hemihydrate (CaSO₃·0.5H₂O) in forced oxidation scrubbers and gypsum (CaSO₄·2H₂O) when aerated. The material's exothermic slaking characteristic requires controlled hydration equipment to prevent overheating during slurry preparation.
Main Applications
Over 75% of FGD lime consumption occurs in coal-fired power plants using wet limestone-gypsum systems, where it serves as a backup reagent when limestone performance declines. It's also essential for: 1. SDA (Spray Dry Absorption) systems in waste incinerators, where lime slurry reacts with SO₂ in a drying chamber 2. Circulating fluidized bed (CFB) scrubbers for small-to-medium boilers 3. Steel industry sintering flue gas treatment, often combined with activated carbon injection.
Safety and Storage
As a Category II alkaline corrosive substance, calcium hydroxide requires UN-approved packaging (e.g., polypropylene-lined bags) and segregated storage from acids. Moisture control is critical - exposure to air causes carbonation, reducing reactivity. PPE requirements include chemical goggles, PVC gloves, and NIOSH-approved N95 respirators during handling. First aid measures for eye contact mandate immediate 15-minute flushing with water. Bulk storage silos should incorporate aeration pads to prevent bridging and vibration dischargers.
B2B Procurement Guide
Industrial buyers should specify: 1. Chemical composition: Minimum 90% Ca(OH)₂, with strict limits on inert materials (<5%) and magnesium oxide (<2%) 2. Particle size: 90% passing 325 mesh for slurry systems; coarser grades (200 mesh) for dry injection 3. Reactivity: Measured by slaking rate (temperature rise) and citric acid neutralization time (<150 seconds). Leading manufacturers include Carmeuse, Lhoist, and Mississippi Lime. Just-in-time delivery is recommended due to shelf-life concerns - use within 6 months of production for optimal performance.
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