A system and method for beneficiation of fly ash particles which at least partially reduces sulfur emissions includes at least one mixing reactor with a chamber and at least one exhaust, at least one fly ash source connected to provide fly ash particles to the chamber, at least one sorbent source, and at least one fluid supply system. The sorbent source provides at least one type of sorbent particles to be mixed with the fly ash particles to reduce sulfur emissions. A mass of the fly ash particles in the chamber is greater than a mass of the sorbent particles in the chamber. The fluid supply system provides at least one fluid to the chamber during a beneficiation of at least a portion of the fly ash particles in the chamber.