China Nonferrous Metallurgy

As an industrial desulfurizer, aluminum industrial red mud has the advantages of abundant source, low price and high overall sulfur capacity. It achieves the purpose of “waste to waste” while desulfurizing at low cost. In this paper, the application of aluminum industrial red mud in flue gas desulfurization was summarized, and the research progress of dry and wet red mud removal SO₂ and H₂S in flue gas was comprehensively reviewed. The advantages and disadvantages of several research directions were compared and analyzed from several dimensions, such as utilization efficiency of active components, energy consumption, complexity of process and subsequent environmental problems. The possible problems and further research directions of market application in the future are also prospected. It is pointed out that in the SO₂ removal from flue gas by wet grout process, it is still necessary to overcome the technical problems such as pipeline blockage, low efficiency, high energy consumption, and the resulting large amount of dilute salt treatment. At the same time, the reaction mechanism and activation means of the transition metals contained in it should be studied. In terms of dry removal of H₂S, further research should be carried out from the aspects of low-cost activated iron oxide, applicability in extreme environment, recycling of waste desulfurizer, and collaborative treatment with other industrial solid wastes.