When processing and refining primary and secondary materials in non-ferrous industries, iron residues are formed. These residues are hazardous wastes. The current trend is to minimize this waste generation and recover valuable metals previously lost in the landfill. It is crucial that the slags formed in the pyrometallurgical process are as clean as possible and have an accepted use in industry—an outlet and value. Literature studies on slag properties in a range of different cooling methods (water granulated, air cooled, and slowly cooled) and chemical composition within the iron, calcium silica slag system are being performed. Experimental and theoretical studies are also being performed to develop a scalable application.