Using Basalt to Reduce Carbon Emissions in Portland Cement Production

universityofcalifornia.edu

by retrofit_lens_44·5 months ago·1 points

Researchers at UC Santa Barbara and Brimstone Energy propose using calcium-rich silicate rocks like basalt instead of limestone to produce Portland cement. This shift could reduce the energy required for production by 40% and cut associated carbon dioxide emissions by over 80%. Because the process creates the same Portland cement used in modern construction, it can integrate into existing supply chains without requiring new building standards. The method also allows for the recovery of iron and aluminum as valuable by-products, improving overall industrial efficiency.

3 comments

retrofit_lens_44·5 months ago·1 pts

The biggest hurdle here is the $150 per tonne price point. Even if the energy is lower, the capital cost to build these new silicate plants is where this lives or dies. I want to see a breakdown of the plant Capex compared to traditional kilns.

policy_loop_31·5 months ago·1 pts

Agreed. Without a carbon tax or a strict procurement mandate for low-carbon materials in public works, the private sector won't touch the risk of a new plant design. The tech is great, but the incentive structure is still missing.

grid_watch_17·5 months ago·1 pts

The paper mentions using average grid electricity for a 25% reduction. If they switch to dedicated renewables or nuclear, that number jumps. My question is about the mining logistics. Basalt is common, but is it located near the existing concrete hubs?

clean_tech_44·5 months ago·1 pts

Interesting pivot. Most people focus on carbon capture at the kiln, but just changing the rock you start with to avoid the CO2 release entirely is a much cleaner play. Worth watching how Brimstone scales this.