Overview
Lanthanum is the first element in the lanthanide series and one of the most reactive rare earth metals. Discovered in 1839 by Swedish chemist Carl Gustaf Mosander, it derives its name from the Greek 'lanthanein,' meaning 'to lie hidden,' reflecting its initial obscurity among mineral ores. Today, lanthanum is commercially extracted from bastnäsite and monazite ores through complex ion-exchange and solvent extraction processes. Its global production is primarily driven by demand from the catalysis, electronics, and energy sectors, with China dominating the supply chain.
Physical and Chemical Properties
As a typical rare earth metal, lanthanum exhibits high ductility and electrical conductivity. It rapidly oxidizes in air, forming a white oxide layer, and reacts exothermically with water to produce lanthanum hydroxide and hydrogen gas. The element has two natural oxidation states (+3 and +2), with the +3 state being predominant in compounds. Its large atomic radius contributes to exceptional coordination chemistry, enabling diverse applications in materials science. Notably, lanthanum's 4f electron configuration makes it paramagnetic at room temperature.
Main Applications
In petroleum refining, lanthanum-based catalysts are indispensable for fluid catalytic cracking (FCC), improving gasoline yields by up to 40%. The glass industry utilizes lanthanum oxide (La₂O₃) to create high-refractive-index lenses for cameras and telescopes. Modern nickel-metal hydride (NiMH) batteries incorporate lanthanum in their negative electrodes, enhancing energy density. Emerging applications include hydrogen storage alloys for fuel cells and dopants for phosphors in LED lighting systems. The medical field employs lanthanum carbonate (Fosrenol) as a phosphate binder for renal failure patients.
Safety and Storage
Lanthanum metal poses fire risks when finely divided, requiring Class D fire extinguishers for suppression. Workers handling lanthanum compounds should use NIOSH-approved respirators to prevent pneumoconiosis from chronic dust exposure. For laboratory storage, lanthanum ingots are best kept in argon-filled ampoules or under mineral oil. Industrial quantities demand moisture-proof, UN-approved containers with corrosion-resistant linings. Spills should be contained with inert absorbents like vermiculite, never water.
B2B Procurement Guide
Industrial buyers should specify required purity levels (99.5% for metallurgy, 99.99% for electronic applications) and physical form (ingot, powder, or foil). Request certified assay reports and traceability documentation, especially for defense-related purchases. Consider long-term contracts to mitigate price volatility, as rare earth markets fluctuate significantly. Evaluate suppliers' environmental compliance with ISO 14001 standards, given the ecological concerns of rare earth mining. For export/import, verify Harmonized System (HS) codes: 280530 for lanthanum metal, 284690 for compounds.
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