Coal-based solid waste geopolymer cementing material and preparation method thereof

The invention discloses a coal-based solid waste geopolymer cementing material with coal gangue and fly ash as main materials, desulfurized gypsum as a mineral admixture and hydroxide and liquid water glass as composite activator ligands, and a preparation method thereof. The preparation method comprises the following steps: preparing the silicon-aluminum mixture, preparing the alkaline activator ligand and preparing the geopolymer cementing material. The coal gangue activating treatment mode and the variety and the mixing amount of the composite alkaline excitant are determined. The geopolymer cementing material is composed of a component A, a component B and a component C, wherein the component A (mixture) comprises 60% of coal gangue powder, 35% of fly ash and cement and 5% of desulfurized gypsum; the material B (ligand) comprises 4-16% of water glass (accounting for A) and 2-4% of hydroxide (accounting for A); and the material C comprises 50% of water (accounting for A) and 2-4% of an additive (accounting