Red Mud Iron Recovery and Low-Carbon Cement: Turning Bauxite Waste into a Strategic Resource

Aluminium red mud, the caustic byproduct of alumina refining, is being reimagined as a dual-purpose feedstock for iron recovery and low-carbon cement. With over 4 billion tonnes accumulated globally, researchers are developing methods to extract iron at rates above 90% while using the remaining residue for alkali-activated binders that can replace Portland cement. China alone generates 107 million tonnes of red mud annually, much of it high-grade iron ore equivalent. Technologies like soda roasting and hydrogen-based reduction are improving recovery efficiency and cutting carbon emissions. The shift from passive storage to active valorization could reduce import dependence and lower industrial emissions simultaneously.