Zeolites: Emissions
Probably as light as crushed rock, but unmeasured
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.Per t of natural zeolite product at the mill gate, cradle-to-gate. Intensity: United States Antimony Corp technical report 2025; analogue MPA 2009 via BGS 2010 (indicative). Global total: USGS MCS 2026.
Footprint by lifecycle phase
| Phase | Intensity | Share | Main sources of emissions | Notes | Source |
|---|---|---|---|---|---|
| Extraction | a few kg CO2e/t (analogue) | – | drill, blast and truck from open-pit benches | comparable rock quarrying and crushing averages about 4.3 kg CO2/t (Mineral Products Association 2009 via BGS 2010), an indicative analogue | Bear River Zeolite technical report 2025; MPA 2009 |
| Refining / processing | a few kg CO2e/t for dry crushing and screening; more for heat-activated grades (not published) | – | electric crushers and screens in enclosed sheds; dryers or kilns for activation | no water, reagents or tailings at Bear River | United States Antimony Corp, 2025 |
| Movement | about 4.5 kg CO2e/t per 25 km by truck (derived) | – | road haul of bagged and bulk product to regional buyers | low value keeps markets regional | ERM for The Crown Estate, 2010 (derived) |
| Usage | as pozzolan, each t replacing clinker avoids roughly 0.7 t CO2 (derived) | – | replacement of clinker in blended cement | about 0.7 t CO2 per t of clinker (derived: 0.63 t/t cement, 80-90% from clinker, clinker ratio 0.76; Columbia CKI 2026), indicative | Columbia CKI 2026 (derived) |
| Recycling / end of life | water-treatment and desiccant zeolites can be regenerated and reused | – | reprocessing by washing or heating | USGS says quantities recycled are unknown; feed and soil uses end in the soil | USGS MCS 2026 |
Other environmental impacts
Some zeolite deposits contain fibrous erionite, a carcinogen, so deposits are tested. Synthetic zeolites, made chemically from sodium silicate and alumina, have a much higher footprint than natural ones (not quantified here).
Levers to cut emissions
- Use zeolitic tuff as a clinker substitute in cement (about 0.7 t CO2 avoided per t of clinker replaced, derived)
- Prefer natural over synthetic zeolites where performance allows
- Power crushing with renewable electricity
- Regenerate spent water-treatment media rather than replacing them
India
India is not listed by USGS as a natural zeolite producer (2024-2025), so its footprint is in imported and synthetic zeolites used in detergents and catalysts, which are not quantified here.
Emission figures are indicative global averages from the life-cycle studies named; actual footprints vary widely by site, energy mix and method.