Novel expanded perlite model sand and preparation method thereof

The invention relates to a novel expanded perlite model sand and a preparation method thereof, the model sand is prepared by modified closed pore perlite, particle granularity is between 0.1 and 2.0mm, particle unit weight change scope is between 1.12-1.42t/m , and the angle of repose is between 25-33 DEG. The preparation method comprises the following steps: 1)selecting the modified closed pore perlite as a base material; 2)primary selecting base material unit weight; 3)fragmenting the particles; 4)screening particle size; 5)sorting the particle unit weight; 6)preparing the finished product; and 7)detecting and verifying the finished product characteristic. The model sand has the following advantages that 1)the particle unit weight can be artificially adjusted, particle size scope is wide, particle form of the model sand is same with that of the natural sand; 2)physicochemical property is stable, intensity is high, and model sand enables repeatable utilization; 3)angle of repose is large, stable bed surface form can be easily formed, and the model sand has good hydraulics parameter; 4)base material production technology is simple, and can be massively obtained, the product enables large-scale preparation, and production cost is low.