Brimstone describes its Rock Refinery as a co-production process that uses abundant silicate rock to produce multiple industrial materials. Its first generation is designed to produce ordinary portland cement, smelter-grade alumina, and supplementary cementitious materials, with later expansion into steel, aluminum, titanium, magnesium, and other critical minerals. Shared feedstock and infrastructure aim to improve material and energy efficiency while reducing waste and emissions.
Brimstone describes how its Rock Refinery uses co-production to make cement, steel, aluminum, and other industrial materials from abundant feedstock. The company says the approach relies on shared infrastructure and improved mass and energy efficiency, with the aim of reducing waste and emissions while expanding access to essential materials.
Brimstone receives third-party certification that its decarbonized cement meets ASTM C150 standards for ordinary portland cement. The company also describes its cement production process as carbon-negative.
