Rhenium: Emissions
Why price swings move rhenium's carbon footprint
Why price swings move rhenium's carbon footprint 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 450 t CO2e per t range about 150-1,500 depending on rhenium and molybdenum prices and on the molybdenum footprint · cradle-to-gate, economic allocation within molybdenite roasting. Derived: about 0.7 kg Re recovered per t of Mo, rhenium worth about 4% of combined value at 2025 prices, and about 8 t CO2e per t of Mo up to roasting. Indicative only Global emissions per year 0.04 Mt CO2e per year 2025 · about 450 t CO2e/t x 81 t primary (derived, indicative)Per t of rhenium (metal or contained in ammonium perrhenate), cradle-to-gate. Intensity: Derived from USGS MCS 2026 prices and Wei et al. 2020, Journal of Sustainable Metallurgy (molybdenum footprint). Global total: Derived from USGS MCS 2026.
Footprint by lifecycle phase
| Phase | Intensity | Share | Main sources of emissions | Notes | Source |
|---|---|---|---|---|---|
| Extraction | allocated share of copper-molybdenum mining and flotation | – | diesel haulage and grinding; mining and beneficiation are 14-81% of molybdenum's footprint | Under economic allocation rhenium's high price pulls in a large share of upstream burden | Wei et al. 2020 (molybdenum) |
| Refining / processing | roasting of molybdenite, scrubbing of Re2O7 from roaster gas, ion exchange, ammonium perrhenate crystallisation, hydrogen reduction to metal | – | roaster fuel, reagents, hydrogen | Smelter-residue routes in Poland and Central Asia sit inside copper smelting | Cochilco (2016); USGS MCS 2026 (qualitative) |
| Movement | negligible per tonne | – | air and container freight of small lots | Not material | Qualitative |
| Usage | no direct emissions | – | turbine blades, reforming catalysts | Enabling: higher turbine inlet temperatures raise jet-engine and gas-turbine efficiency | Qualitative |
| Recycling / end of life | significant: EU end-of-life recycling input rate 50%; world recycling 35-40% including catalysts | – | hydrometallurgical recovery from superalloy scrap; closed catalyst loop | Engine revert remelting avoids primary burden almost entirely; secondary output 20-25 t in 2025 | EU CRM 2023; BRGM (2020); USGS MCS 2026 |
Other environmental impacts
Shares the SO2 handling of molybdenite roasting; rhenium itself is of low toxicity.
Levers to cut emissions
- Expand superalloy scrap and revert recycling (already 20-25 t a year)
- Fit rhenium recovery to more molybdenum roasters, spreading roasting burden over more product
- Low-carbon power and electrified haulage at copper-molybdenum mines
- Lower-rhenium alloy designs, as engine makers did after the 2008 price spike
India
India produces no rhenium. Its footprint is embedded in imported reforming catalysts for refineries and superalloys for aero-engine and gas-turbine work, and spent catalysts are usually returned to the supplier's closed loop.
Emission figures are indicative global averages from the life-cycle studies named; actual footprints vary widely by site, energy mix and method.