Brimstone pitches cleaner cement plus critical minerals from one rock

Brimstone is developing a process that makes cement from silicate rocks instead of limestone, cutting CO2 emissions by about 60%. The same rock and plant could also yield smelter-grade alumina, steel, magnesium and titanium, a market the company pegs at $2.4 trillion. Its Reno plant, producing only cement, supplementary materials and alumina, is expected to start in 2028.

• Process cuts cement CO2 emissions by roughly 60% versus conventional limestone
• Same rock could yield alumina, steel, magnesium and titanium, a $2.4T market
• Reno plant to start in 2028 with cement, supplementary materials and alumina
• Trump administration revoked a $189 million grant for the demonstration plant