Method for preparing negative carbon filling body from coal-based solid waste mineralized carbon dioxide

The invention discloses a method for preparing a negative carbon filling body from coal-based solid waste mineralized carbon dioxide, which comprises the following steps: selectively crushing coal gangue in coal-based solid waste to obtain solid coal gangue particles; grading and grading the solid coal gangue particles, and selecting calcium-based solid waste and magnesium-based solid waste from the coal-based solid waste; adding the calcium-based solid waste particles and the magnesium-based solid waste particles into fly ash to obtain a mixture; introducing the waste gas into waste gas treatment equipment, and treating to obtain treated waste gas; adding the mixture into a reaction kettle, introducing the treated waste gas, and carrying out mineralization reaction to obtain a product after the mineralization reaction; transferring a product after the mineralization reaction to a stirring pool, adding water, mixing and stirring to prepare negative carbon slurry; and negative carbon is pumped to the mining sp