Phosphogypsum-based outdoor landscape material for 3D (three-dimensional) printing

The invention discloses a phosphogypsum-based outdoor landscape material for 3D (three-dimensional) printing. 70-85 parts of phosphorus gypsum, 3-8 parts of coagulation accelerators, 2-4 parts of cement, 0.01-0.03 part of graphene oxide and 0.5-2 parts of nano-silicon dioxide are mixed to obtain composite powder, a roller is pushed to a modeling platform, a layer is uniformly paved, the thickness of the layer is smaller than 0.075mm, a printing head sprays 8-20 adhesive curing composite powder, a color ink-jet printing head selectively jets two pigments on paved powder, and the modeling platform repeatedly reduces layer by layer until phosphogypsum-based outdoor landscapes are finished. The prepared phosphogypsum-based outdoor landscape material is a green building material, wide in source, low in cost, easy to obtain, low in toxic and side effect, good in water resistance and prepared in a 3D printing manner and has functions of removing odor, resisting pollution, purifying air and the like, mechanical machining or any molds are omitted, 28d strength is larger than 20Mpa, and a softening coefficient is larger than 0.85.