TheFerronickel slag productionProductions of high-grade FerronickelFerronickel (FeNi) using the Rotary Kiln Electric FurnaceElectric furnace (RKEFRotary Kiln Electric Furnace (RKEF)) process is typically a CO2 emissions-intensive operation. However, FeNi slagSlag is an untapped high-quality energy source that if harnessed can be used to reduce the plant’s carbon footprintCarbon footprint. Conventionally, FeNi slagSlag is either molten hauled and dumped or water granulated leading to a loss of up to 100 MW of sensible heat in the case of an 85 MW electric furnaceElectric furnace. Air granulationAir granulation uses a high-velocity jet of air to granulate molten slagSlag, enabling slagSlag heat recoveryHeat recovery through the generation of hot off-gas and high surface area slagSlag granules. High-quality heat can be recovered and used to offset fuel requirements in the drying or calcination steps or even to generate electricity, offsetting the emissions from coal-fired power plants. In this paper, the use of air granulationAir granulation to reduce greenhouse gas emissionsGreenhouse gas emissions was evaluated for a generic RKEFRotary Kiln Electric Furnace (RKEF) FeNi plant with an 85 MW furnace.