Overview
Lipu Lime Block, sourced from Guangxi's high-purity limestone deposits, is a premium form of calcium oxide (quicklime). Its low impurity content and uniform composition make it a preferred choice for industrial and agricultural applications. The region's unique geology ensures consistent quality, with Lipu lime historically used in traditional Chinese construction. As a key alkaline material, it undergoes calcination at ~900°C to convert limestone (CaCO₃) into reactive CaO. B2B buyers often procure it in 10-50kg lumps for ease of handling and controlled usage in bulk processes.
Physical and Chemical Properties
Lipu Lime Block exhibits a crystalline structure with porosity that enhances its surface area for chemical reactions. Its high melting point (2,572°C) makes it suitable for refractory applications. When hydrated, it generates substantial heat (1.15 MJ/kg), a property leveraged in self-heating materials. The material's alkalinity (pH ~12.5) enables acid neutralization in wastewater treatment. Its reactivity with silica and alumina forms calcium silicates/aluminates, crucial for cement production. Impurities like magnesium oxide (MgO) are typically <5%, ensuring predictable performance in metallurgical fluxes.
Main Applications
In construction, Lipu lime blocks are slaked to produce hydrated lime for mortars, improving workability and carbonation strength. Steel mills use it as a flux to remove phosphorus/sulfur impurities at ~1-3% of iron ore weight. Agriculture relies on its pH adjustment capability (0.5-2 tons/acre) to neutralize acidic soils. Chemical industries employ it in calcium carbide synthesis and flue gas desulfurization (FGD). Emerging uses include food-grade lime for corn nixtamalization and as a reagent in precipitated calcium carbonate (PCC) production. Its antimicrobial properties also find niche applications in poultry farming.
Safety and Storage
CaO's exothermic reaction with moisture necessitates dry storage in polyethylene-lined bags or silos with <1% humidity. Bulk shipments require covered transport to prevent rain exposure. Thermal burns can occur during handling; NIOSH-approved N95 masks prevent inhalation of dust particles. Spills should be contained with dry sand—never water—and disposed of as hazardous waste (EPA Class 9). Facilities must equip eyewash stations and maintain MSDS documentation. Long-term storage (>6 months) may require nitrogen blanketing to prevent carbonation.
B2B Procurement Guide
Reputable Lipu suppliers provide XRD analysis reports confirming CaO content and reactivity (TT60 slaking time <3 minutes). Construction-grade lime should meet GB/T 5762-2012 standards, while metallurgical grades require low sulfur (<0.1%). Bulk buyers (20+ tons) can negotiate FOB prices from Guangxi ports. Consider INCOTERMS: CIF pricing includes ~$15/ton shipping to Southeast Asia. Audit suppliers for mining licenses and environmental compliance. Sample testing should verify particle size (typically 3-10cm lumps) and absence of uncalcined 'core' material.
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