Fluorite[3]
Overview
Natural fluorite granules are a non-metallic mineral resource primarily composed of calcium fluoride (CaF2), formed through hydrothermal geological processes. They are classified into three industrial grades: acid-grade (≥97% CaF2 for chemical use), ceramic-grade (85–95% for glass/ceramics), and metallurgical-grade (60–85% for steelmaking). The granules exhibit vitreous luster and often display fluorescence under ultraviolet light due to trace impurities. Historically mined since ancient times for ornamental purposes, modern applications leverage fluorite's unique properties. China, Mexico, and South Africa dominate global production, with reserves estimated at over 250 million metric tons. The material is extracted via open-pit or underground mining, then crushed and sorted by color and purity.
Physical and Chemical Properties
Fluorite granules crystallize in the isometric system, typically forming cubic or octahedral structures with perfect octahedral cleavage. Their Mohs hardness of 4 makes them relatively soft compared to other industrial minerals. The material demonstrates anisotropic thermal expansion and is transparent to infrared and ultraviolet wavelengths. Chemically, fluorite is notable for its exceptional stability—it resists attack by most reagents except concentrated sulfuric acid, which converts it to hydrofluoric acid. The granules have a low refractive index (1.434) and dispersion, making them valuable for specialized optical lenses. Impurities like rare earth elements can induce vivid coloration while maintaining chemical utility.
Main Applications
In metallurgy, fluorite granules (60–85% CaF2) serve as a flux to lower the melting point of raw materials and remove impurities during steel production, consuming approximately 40% of global output. Acid-grade fluorite (≥97% purity) is essential for manufacturing hydrofluoric acid, the precursor to all fluorine compounds including refrigerants and PTFE. The ceramic and glass industries utilize fluorite granules as opacifiers and fluxing agents to improve product transparency and reduce energy consumption. Other applications include aluminum production (as a bath additive), welding rod coatings, and water fluoridation. High-purity synthetic fluorite is critical for UV optics in semiconductor lithography systems.
Safety and Storage
While fluorite itself is non-toxic, dust from processing can cause respiratory irritation and should be controlled with proper ventilation or PPE. The material reacts exothermically with strong acids, requiring segregated storage from acidic substances. Long-term exposure to moist conditions may lead to slight surface degradation. For bulk storage, maintain dry conditions (<1% moisture) in silos or covered containers to prevent caking. Transport requires standard mineral product packaging—typically 1-ton bulk bags or 50kg woven sacks. Regulatory classifications vary by region; in the EU, fluorite dust is classified as STOT RE 1 (H372) under prolonged inhalation exposure.
B2B Procurement Guide
Industrial buyers should specify: 1) CaF2 content (acid/ceramic/metallurgical grade), 2) grain size distribution (e.g., 10–30mm for steelmaking), 3) allowable impurities (SiO2, CaCO3, S content), and 4) moisture content (<0.5% for chemical-grade). Sample testing via XRF analysis is recommended to verify composition. Major suppliers include Mexichem, China Kings Resources Group, and Kenya Fluorspar Company. Prices fluctuate based on energy costs and environmental regulations affecting mining. Consider long-term contracts to hedge against market volatility, with typical MOQs of 500 tons for bulk shipments. Logistics should account for fluorite's density (2–3 tons/m³) when planning container loading.
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