Overview
Fluorite lump, a naturally occurring mineral of calcium fluoride (CaF2), is a critical industrial material classified as metallurgical, ceramic, or acid grade based on purity. Its cubic crystal structure and vibrant colors (often purple or green) make it distinguishable. Historically used as a flux since ancient times, modern applications leverage its chemical stability and low melting point. Globally, China, Mexico, and South Africa are key producers. Metallurgical-grade fluorite (60-85% CaF2) dominates the market due to steel industry demand. Higher purity (>97%) grades are essential for hydrofluoric acid production, a precursor to fluorocarbons and refrigerants.
Physical and Chemical Properties
Fluorite lumps exhibit isotropic hardness (4 on Mohs scale) and perfect octahedral cleavage. Their low refractive index (1.434) makes them valuable in optical lenses, though most industrial uses prioritize chemical reactivity. When heated with sulfuric acid, fluorite yields hydrofluoric acid—a process requiring specialized equipment due to corrosion risks. The mineral’s fluorescence under UV light (from rare earth impurities) is a diagnostic feature but irrelevant to industrial performance. Thermal stability up to 1,400°C allows fluxing applications in steelmaking, where it lowers slag viscosity and removes impurities like sulfur.
Main Applications
In metallurgy, fluorite lumps are added to blast furnaces (150-200kg per ton of steel) to enhance fluidity. Aluminum producers use it to lower electrolysis bath temperatures. The chemical industry consumes high-purity fluorite for hydrofluoric acid, which further synthesizes Teflon, refrigerants, and uranium fuel. Secondary uses include ceramic glazes (as an opacifier) and welding rod coatings. Emerging applications in lithium-ion battery electrolytes and solar panel etching are driving demand for ultra-high-purity (>99.9%) fluorite, though these account for <5% of current market volume.
Safety and Storage
Fluorite itself is non-flammable, but dust can cause respiratory irritation (TLV 2.5mg/m³). Prolonged exposure to HF gas during processing requires strict ventilation. Bulk storage should avoid acidic conditions to prevent slow HF release. Steel or HDPE containers are preferred for transport. Workers handling fluorite must wear N95 masks and acid-resistant gloves. Spills should be collected dry; water rinsing risks acid formation. UN classification varies by product form, with most shipments falling under NON-DG for bulk mineral transport.
B2B Procurement Guide
Key specifications include CaF2 content (request assay reports), lump size (affects furnace performance), and impurity limits (e.g., <0.1% Pb for ceramic use). South African fluorite typically has lower silica content than Chinese sources, reducing slag volume in steelmaking. Spot prices fluctuate with steel industry cycles. Long-term contracts (6-12 months) are common for acid-grade material. Verify supplier certifications like ISO 9001 and MSDS compliance. For imports, check destination country regulations—some restrict fluorite with >0.1% uranium/thorium content.
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