Lafarge Canada Partners For Circular Economy Project

Rio Tinto, Geocycle Canada, and construction materials company Lafarge Canada are working together to reuse waste from the aluminum smelting process to make cement. In this circular economy initiative, the trio will reduce the need to extract other raw materials and create value from waste. Geocycle Canada, a Lafarge Canada subsidiary, and Rio Tinto have developed a new product called Alextra, made from used potlining, as part of the aluminum electrolysis process that would otherwise go to landfill. Alextra is the result of years of research and development, aimed at finding new ways to deliver sustainable outcomes and value from used potlining. Lafarge Canada will produce on average one million tonnes of cement a year at its facilities in Bath, ON, using Alextra as an alternative to raw materials such as alumina and silica, which are commonly refined or mined for use in the manufacturing of cement. The companies will explore options to further expand the supply of Alextra from Rio Tinto's Potlining Treatment Plant in Saguenay-Lac-St Jean, QC, to Lafarge Canada's network of cement plants.