Red mudRed mud is the industrial waste generated in the Bayer process of aluminaAlumina production. The low-cost disposal and comprehensive utilization of red mudRed mud is the hotpot. ProcessingProcessing into building materials is an important approach to utilize red mudRed mud on a large scale, but it is limited by the alkalinity in the red mudRed mud. In this paper, TiO2 sulfuric acid wasteTiO2 sulfuric acid waste was employed as the DealkalizationDealkalization agent, and the feasibility of TiO2 sulfuric acid wasteTiO2 sulfuric acid waste to remove alkalinity in red mudRed mud was preliminarily explored. The results show that when the concentration of TiO2 sulfuric acid wasteTiO2 sulfuric acid waste is 0.2 mol/L and the liquid–solid ratio is 6, the dealkalization rate of red mudRed mud exceeds 80%, which can realize the effective dealkalization of red mudRed mud. This study may have an important reference for low-cost dealkalization and large-scale comprehensive utilization of red mudRed mud.