Method for preparing rapid repair mortar from solid waste-based sulphoaluminate cementing material

The invention discloses a method for preparing rapid repair mortar from a solid waste-based sulphoaluminate cementing material, and the rapid repair mortar comprises the following components: 30-50 parts of a solid waste-based sulphoaluminate cementing material, 5-20 parts of fly ash, 0-10 parts of desulfurized gypsum, 10-30 parts of tailing sand aggregate, 5-20 parts of quartz sand, 0.1-0.5 part of a water reducing agent, 0.2-1 part of latex powder, 0.02-0.05 part of an antifoaming agent, and 0.02-0.05 part of a suspending agent. 0.1 to 0.5 part of polypropylene short fiber; the mesh number of the quartz sand is 20-200; the tailing sand aggregate is gold tailings with the mesh number of 40-80; the preparation method comprises the following steps: mixing the components of the rapid repair mortar in proportion, adding water accounting for 20-30% of the mass of a solid, stirring at a low speed of 200-300rpm, and then stirring at a high speed of 400-600rpm to obtain the rapid repair mortar. The repair mortar pre