Tungsten: Emissions
The carbon cost of the hardest working metal
What this tab covers The greenhouse-gas footprint of the commodity at a global level, split by lifecycle phase: extraction (or farming), refining and processing, movement, usage, and recycling or end of life. Intensities are per unit of product; the global total combines intensity with world output. Also covers other environmental impacts and the main levers to cut emissions. Emission intensity 12.6 t CO2e per t range not published by ITIA in the sources used · cradle-to-gate global average per kg W from ecoinvent data Global emissions per year 1.10 Mt CO2e per year 2025 · 12.6 t CO2e/t x 85,000 t W (derived, indicative)Per t of tungsten contained (cradle-to-gate, concentrate to APT and metal powder). Intensity: Nuss & Eckelman 2014, PLoS ONE (ecoinvent-based, indicative). Global total: USGS MCS 2026; Nuss & Eckelman 2014; derived.
Footprint by lifecycle phase
| Phase | Intensity | Share | Main sources of emissions | Notes | Source |
|---|---|---|---|---|---|
| Extraction | not published separately | – | underground and open-pit mining of ore often below 0.5% WO3, grinding, gravity separation and flotation | Low grades mean a lot of rock and power per tonne of tungsten (indicative) | content_v2 chain |
| Refining / processing | not published separately; likely the dominant stage (indicative) | – | alkali digestion, APT crystallisation, calcining, hydrogen reduction and carburising, mostly on China's coal-heavy grid | Hydrogen used to reduce oxide to powder is usually made from fossil fuels; carburising and sintering carbide add furnace energy | content_v2 chain; indicative |
| Movement | minor (indicative) | – | concentrate and APT shipping | Small tonnages of high-value material | indicative |
| Usage | not applicable | – | carbide tools and wear parts emit nothing in use | Longer-lasting tools cut machining energy and waste; tungsten wire saws reduce silicon loss in wafer cutting | content_v2 uses; indicative |
| Recycling / end of life | lower than primary (no sourced figure) | – | zinc process and chemical recovery of carbide scrap | EU end-of-life recycling input is 42%, one of the highest among critical metals; chemical recycling returns tungsten to APT | EU CRM 2023 |
Other environmental impacts
Tungsten is one of the 3TG conflict minerals (with tin, tantalum and gold); artisanal mining in Rwanda and DR Congo needs due diligence. Ore processing can release arsenic and fluoride into water (indicative).
Levers to cut emissions
- Raise carbide scrap collection and recycling beyond the 42% EU end-of-life input rate
- Use green hydrogen for oxide reduction (indicative)
- Shift APT and powder plants to low-carbon power; new Western plants in Korea and Kazakhstan can be built on cleaner grids
- Improve ore recovery: Masan's refinery recovers about 96% in APT processing
India
India has no significant tungsten mining and imports concentrate, APT, powder and carbide for tool makers, so its footprint is embodied in imports, mostly linked to Chinese processing (USGS; content_v2).
Emission figures are indicative global averages from the life-cycle studies named; actual footprints vary widely by site, energy mix and method.