Nano silicon dioxide modified sludge carbon cement material as well as preparation method and application thereof

The invention discloses a nano-silica modified sludge carbon cement material and a preparation method thereof, the cement material comprises the main components of sludge carbon, nano-silica, zeolite, a cement-based material and the like, and the preparation method comprises the following steps: conditioning and modifying municipal sludge, and carrying out high-dryness dehydration, crushing, drying and pyrolysis to obtain the sludge carbon; respectively cleaning, drying, grinding and screening the sludge carbon and the zeolite; carrying out ball milling on nano silicon dioxide, impurity-removed zeolite and impurity-removed sludge carbon, adding into the suspension, carrying out magnetic stirring, separating to obtain sludge carbon impregnated with nano silicon dioxide and zeolite, and drying to obtain a sludge carbon raw material; and pyrolyzing and grinding the sludge carbon raw material subjected to clay treatment, and doping into a cement-based material to prepare the nano silicon dioxide modified sludge c