Overview
Cobalt is a transition metal found in the Earth's crust, primarily extracted as a byproduct of nickel and copper mining. It has been used since ancient times for blue pigments but gained industrial significance in the 20th century due to its unique magnetic and alloy-strengthening properties. As a critical raw material, cobalt is classified as a strategic resource by multiple governments. Its supply chain is geographically concentrated, with over 70% of refined production originating from the Democratic Republic of Congo.
Physical and Chemical Properties
Cobalt is ferromagnetic at room temperature, with properties similar to iron and nickel. It maintains its strength at high temperatures, making it invaluable for jet engine components. The metal exhibits two allotropes: hexagonal close-packed (hcp) below 417°C and face-centered cubic (fcc) at higher temperatures. Chemically, cobalt is moderately reactive. It forms numerous oxidation states (+2 and +3 being most common) and complexes. When powdered, it may ignite spontaneously in air. The metal demonstrates excellent resistance to seawater corrosion and retains hardness after prolonged use.
Main Applications
Approximately 50% of global cobalt consumption is for lithium-ion battery cathodes (LiCoO₂), particularly in electric vehicles and electronics. Another 20% is used in superalloys for aerospace turbines, where cobalt improves high-temperature strength and corrosion resistance. Other applications include cemented carbides for cutting tools (15%), industrial catalysts (10%), and pigments/ceramics (5%). Emerging uses include next-generation battery chemistries like nickel-manganese-cobalt (NMC) formulations. Medical applications include radioactive cobalt-60 for cancer radiotherapy and prosthetics.
Safety and Storage
Cobalt metal dust presents fire/explosion hazards and requires Class D fire extinguishers. Workplace exposure limits are typically 0.02 mg/m³ for respirable dust (8-hour TWA). Chronic exposure may cause "cobalt lung" (hard metal disease) or dermatitis. Storage should be in sealed containers with desiccants to prevent oxidation. Bulk shipments often use steel drums or specialized bulk bags. Facilities handling cobalt powder require explosion-proof equipment and proper ventilation to maintain concentrations below explosive limits (0.1–7.0% in air).
B2B Procurement Guide
Industrial buyers should specify purity levels: 99.3% for alloys, 99.8%+ for battery applications. Forms include ingots (10–25 kg), powder (mesh sizes 200–325), and briquettes. Ethical sourcing is critical—look for suppliers certified under Cobalt Refinery Supply Chain Due Diligence Standard. Pricing follows LME benchmarks but varies by form and quantity. Long-term contracts (6–24 months) are common due to market volatility. Logistics require non-hazardous classification for solid metal but hazardous labels for powder. Major producers include CMOC, Glencore, and Umicore.
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