Selenium
Recovered from copper anode slimes, selenium punches above its weight in markets as diverse as glass de-colourising, vitamin-rich animal feed and CIGS thin-film solar cells. With CRT photo-conductors gone, demand now balances steady glass offtake against rising PV and nutritional uses. Annual production (slightly over 3 kt) moves with copper cathode output, keeping price sensitive to smelter maintenance and mine expansions.
Supply Dynamics
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Chilean and Japanese smelters remain anchor producers; supply follows global Cu refining cycles.
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Secondary recovery from e-waste and off-spec PV modules is nascent but technologically viable.
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Geopolitical or labour disruptions at large Cu smelters can quickly tighten Se availability.
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Purity premiums widen as solar-grade demand rises, incentivising upgraded refining lines.
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No stand-alone Se mines exist. Co-product economics limit rapid supply response.
Demand Dynamics
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Container- and flat-glass makers blend Se to neutralise iron-green tints; volume tracks construction and beverage sectors.
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CIGS and tandem PV projects lift high-purity demand; each GW needs ~12 t Se.
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Organic Se-yeast feed additives grow with industrial livestock and aquaculture.
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Free-machining steel and stainless producers use Se as a torque-reducer substitute for Pb.
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Legacy photocopier and CRT uses have almost vanished, freeing capacity for new segments.