HIsmelt ironmaking process is known for its short process,wide applicability of raw materials,and high purity of products.It is an efficient,low-carbon and green ironmaking process that utilizes aluminum-chromium refractory materials for furnace lining.Using tabular corundum and aluminum-chromium slag as raw materials,aluminum dihydrogen phosphate as a binder,and silica micropowder as an additive,a sample of regenerated aluminum-chromium refractory material for HIsmelt smelting reduction ironmaking was prepared by forming under 150 MPa pressure and firing at 1 600 ℃ for 3 h.The influence of silica micropowder on the sintering performance and chromium valence state transformation of the sample was studied.The results show that the addition of silica micropowder can promote the sintering process and formation of aluminum-chromium solid solution to avoid the generation of Cr6+ compounds.The lattice constant of the aluminum-chromium solid solution increases with the addition of silica micropowder.Meanwhile,silica micropowder can reduce Cr6+ to Cr3+,reducing the concentration of Cr6+in the specimen.A small amount of mullite will be generated in situ after adding silica micropowder,which will influence the thermal shock resistance and thermal expansion coefficient of the specimen.The appropriate amount of silica micropowder is 2-3wt.％.
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