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Brimstone processBrimstone—

Brimstone

Limestone-free portland cement, alumina

USprivateest. 2019brimstone.com (opens brimstone.com)Checked 25 Sep

The brief

Analyst view
  • Its cement is chemically ordinary portland cement, so no new building codes are needed.
  • Selected in 2024 for a DOE award of up to $189M, which it later lost in 2025 cancellations.
  • Pitches itself as a rock refinery: cement plus alumina and critical metals from the same rock.
Programs

Brimstone, one program

Updated 10 Dec 2025
Brimstone processDissolves calcium silicate rock to make portland cement and other cement ingredients, with alumina and metals as side products.PilotNextFirst commercial plantUpdated 10 Dec 2025View program →
Research · Proto · Pilot · Deploy · Scaling

Peers

Clean cement · 2

Company & funding

HQ
US
Founded
2019

People

Key people
Primer