Method for in-situ wet carbonization and activation of sintered red mud at room temperature, activated red mud and application thereof

The invention belongs to the technical field of red mud treatment, and particularly relates to a method for in-situ wet carbonization and activation of sintered red mud at the room temperature, activated red mud and application thereof. The method for in-situ wet carbonization and activation of the sintered red mud at the room temperature comprises the steps of taking sintered red mud slurry discharged in the aluminum oxide industry, continuously introducing gas containing carbon dioxide into the sintered red mud slurry, and enabling the carbon dioxide and the sintered red mud slurry to be subjected to carbonization reaction at the room temperature and normal pressure until the pH value of reaction liquid is 6.5-7.5, thereby achieving carbonization and activation of the sintered red mud. The activated red mud obtained after the sintered red mud slurry is treated through the method can be used as an auxiliary cementing material, and the problem that the utilization rate of sintered red mud is low in the prior