Niobium: Emissions
A footprint the main producer has not published
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 12.5 t CO2e per t range not published; CBMM's own figures not found in the sources used · cradle-to-gate global average per kg Nb from ecoinvent data Global emissions per year 1.40 Mt CO2e per year 2025 · 12.5 t CO2e/t x 112,000 t Nb (derived, indicative)Per t of niobium contained (cradle-to-gate, mainly as ferroniobium). 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 | – | open-pit mining of weathered pyrochlore ore, crushing, desliming and flotation | Ore is soft and near surface at Araxa, which keeps mining energy low (indicative) | content_v2 chain |
| Refining / processing | not published separately; likely the dominant stage (indicative) | – | aluminium reductant for the aluminothermic reaction, leaching chemicals, electricity | The aluminium used to reduce niobium oxide carries a large embodied footprint; Brazil's mostly hydro grid lowers power emissions (indicative) | content_v2 chain; indicative |
| Movement | minor (indicative) | – | trucking to Brazilian ports, shipping to China and Europe | High value and small tonnage | indicative |
| Usage | not applicable; enabling savings in steel use | – | No direct emissions in use; the metal sits inside steel or alloys for decades. | Niobium microalloying cuts steel tonnage in pipelines, cars and buildings, avoiding emissions from the steel not made | content_v2 uses; CBMM claims of avoided emissions not verified here |
| Recycling / end of life | no separate route | – | niobium returns diluted in steel scrap | EU end-of-life recycling input is 0%; superalloy scrap is recycled, up to 20% of US apparent consumption | EU CRM 2023; USGS MCS 2026 |
Other environmental impacts
Pyrochlore ores carry small amounts of thorium and uranium, so tailings need radiological management (indicative); Araxa also produces phosphate.
Levers to cut emissions
- Use lower-carbon aluminium as the reductant, or alternative reduction routes (indicative)
- Keep power on Brazil's hydro-heavy grid and use renewables on site
- Count and report the steel-tonnage savings from microalloying in product footprints
India
India has no niobium production and imported 5.8% of world ferroniobium by value in 2024 for its steel mills, so its footprint is embodied in Brazilian imports (UN Comtrade).
Emission figures are indicative global averages from the life-cycle studies named; actual footprints vary widely by site, energy mix and method.