An Innovative Approach to Smelter-Grade Alumina Calcination Using Renewable Energy

AluminumAluminum plays a critical role in modern society, being a key commodity from electric vehicles to green buildings. Thus, decarbonizing the aluminaAlumina and aluminumAluminum industry allows the industry to extend the sustainabilitySustainability benefits to its downstream users by minimizing the associated Scope 3 emissions. Electrification of the aluminaAlumina industry can support the aluminaAlumina producers worldwide to reduce Scope 1 emissions by eliminating their reliance on fossil fuels. Switching to electricity provides the opportunities to capitalize on readily accessible renewable energyRenewable energy at most aluminaAlumina refineries. The absence of a direct heating source inside an electric calciner allows excess thermal energyEnergy in the form of high-purity steam from the aluminaAlumina processingProcessing to be efficiently recycled into the Bayer processBayer process for digestion and evaporation using mechanicalMechanical or thermal vapor recompression, improving the overall energyEnergy efficiency. Preliminary results from the study have shown no observable particle breakage, a common issue in traditional calcinationCalcination, which can help to improve the yieldYield and efficiency in Bayer circuit’s precipitation process and boost product quality. This study explores the potential capability of producing Smelter-Grade Alumina (SGA)Smelter-Grade Alumina (SGA) using an electric drop tube flash calciner as a feasible option to minimize its Scope 1 emissions and providing a potential pathway to zero emissions, aluminaAlumina, and aluminumAluminum production.