From Toxic By-product to Recycled Material: Mine Waste as a Revenue Stream – Part Two
Among all the environmentally hazardous materials in the world, cement is somewhere in the top among the most destructive. Every tonne of cement manufactured causes the direct emission of 0.8 tonnes of CO2.Mining can combine cement and unwanted, abundant mining tailings to make concrete, particularly autoclaved aerated concrete. Already the Phelps Dodge Casa Grande, Arizona Copper mine tailings were used in AAC products with some limitations because the silica content was not ideal.This would reduce the amount of cement required to make concrete, and it would re-purpose tailings. Because tailings use displaces cement use, it also reduces the need for cement production from non-renewable resources.