Overview
Highly Active High-Calcium Lime is a specialized form of calcium oxide (quicklime) characterized by its superior chemical reactivity and minimal impurities. Produced through precise calcination of high-grade limestone at 900-1,200°C, this material typically contains 90-95% available CaO with low levels of magnesium oxide and other contaminants. In industrial contexts, its exceptional purity and rapid reaction kinetics distinguish it from standard quicklime products. The manufacturing process often employs rotary or vertical kilns with strict temperature controls to achieve optimal crystal structure and surface area, which directly influence reactivity.
Physical and Chemical Properties
This lime variant exhibits a porous microstructure with high surface area (1-2 m²/g), enabling faster reaction rates compared to conventional quicklime. Its thermal stability allows use in high-temperature processes up to 2,500°C, while the exothermic reaction with water (slaking) generates significant heat (1,150 kJ/kg). Key quality indicators include available lime index (ALI) ≥90%, reactivity time under 5 minutes (EN 459-2 standard), and particle size distribution tailored for specific applications. The material's low acid-insoluble residue (<2%) makes it particularly valuable for precision industrial processes requiring minimal contamination.
Main Applications
In steelmaking, this lime serves as an efficient flux for phosphorus and sulfur removal during basic oxygen furnace (BOF) operations, with consumption rates of 40-60 kg per ton of steel. Environmental applications include flue gas desulfurization (FGD) systems where its reactivity achieves >95% SO2 removal at lower dosages than conventional lime. The construction industry utilizes it for soil stabilization, asphalt mixtures, and high-performance mortar formulations. Emerging applications include wastewater treatment (pH adjustment), food processing (corn nixtamalization), and chemical manufacturing (precursor for calcium compounds).
Safety and Storage
As a Category II alkaline corrosive substance, this lime requires PPE including chemical goggles, acid-resistant gloves, and NIOSH-approved respirators for dust protection. Storage facilities must prevent moisture ingress using sealed silos or double-layer moisture-proof bags, maintaining relative humidity below 50%. Emergency measures include dry cleanup methods (avoid water contact) and calcium gluconate gel for skin exposure. Transportation requires UN 1910 Class 8 labeling with "CORROSIVE" markings. Shelf life is typically 6-12 months when properly stored, though prolonged exposure to atmospheric CO2 can gradually reduce activity through carbonation.
B2B Procurement Guide
Industrial buyers should specify technical parameters: available CaO (min 90%), reactivity time, particle size distribution (typically 1-100mm for lump lime or 50-200μm for powdered form), and permissible impurity levels (MgO <2%, SiO2 <1.5%). Quality verification should include third-party lab testing for EN 459-2 reactivity and T60 slaking rate. Bulk procurement (20+ ton shipments) commonly uses tanker trucks or sealed containers. For international trade, Incoterms should clearly define moisture protection requirements during transit. Leading producing regions include China, Germany, and the USA, with production capacities often exceeding 500,000 tons annually at major facilities.
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