Rivalia Chemical Co. is pioneering new chemical extraction technology to solve two important problems: critical mineral scarcity and coal ash waste management. The U.S. has more than two billion metric tons of coal fly ash containing valuable rare earth elements; what is missing is a sustainable, scalable, and economic method of separation. Rivalia harvests rare earths from ash, then transforms the residual ash for use in green concrete. The closed-loop process features a recyclable ionic liquid applied directly to the ash that preferentially extracts rare earths over bulk elements, limiting chemical consumption and waste generation compared to existing methods.