Method for preparing high-strength 3D printing concrete based on modified antimony tailings

The invention relates to a method for preparing high-strength 3D printing concrete based on modified antimony tailings, and the method comprises the following steps: carrying out mechanical pretreatment on the antimony tailings, and respectively preparing particles with the average particle size of 30 microns and 100 microns according to the mass ratio of 3: 2; preparing a 2.5 mol/L sodium hydroxide solution; the method comprises the following steps: adding antimony tailings prepared according to a mass ratio of 3: 2 into a sodium hydroxide solution, uniformly stirring and mixing, then transferring into a high-pressure reaction kettle, and carrying out hydrothermal activation; after hydrothermal activation, naturally cooling the high-pressure reaction kettle to room temperature, filtering the reacted mixed solution, and washing to be neutral to obtain modified antimony tailings; uniformly stirring materials of ordinary Portland cement, quartz sand and modified antimony tailings, adding a defoaming agent, a th