Carbon Removal in Building Materials

This project provides a verified carbon credit that can be retired on purchase.

This manufacturing process uses carbon dioxide to turn waste products into limestone used in the construction industry. The process requires very little energy, relying upon the reactivity of the waste material. The waste naturally reacts with carbon dioxide in the presence of water. The conditions are carefully controlled, accelerating a natural process, taking place in minutes rather than years and resulting in the formation of calcium carbonate (manufactured limestone). The limestone is used by the construction industry and stores the Co2 away for 1,000s of years.

Not only does this process lock away CO2 for 1,000s of years it also reduces the volume of waste consigned to landfill by utilising waste materials in the formation of the limestone, avoiding the adverse environmental impacts associated with landfill operations. And by creating an artificial limestone there is less need for the quarrying of virgin materials, reducing the environmental impacts from quarry operations.

The manufacturing process involves blending different thermal residues, conditioning them with water, and exposing them to a concentration of CO₂ to accelerate the carbonation process. This results in the production of a construction aggregate which has many uses in the construction industry.

England, United Kingdom