Preparation method for light refractory raw material

The invention belongs to the technical field of preparation of heat-insulating materials, and relates to a preparation method of a light refractory raw material. In the method, the light refractory raw material is prepared by combining a foaming method and gel-casting molding. The method is characterized by being implemented through the following steps of: performing ball milling on ceramic powder, water, a monomer and a crosslinking agent to obtain stable ceramic slurry; adding a foaming agent into the ceramic slurry, mechanically stirring and foaming to obtain foam slurry, and adding an initiator and a catalyst into the foam slurry in sequence for rapidly curing and forming the slurry; drying a block obtained by curing, heating to 1,400-1,800 DEG C, and sintering to obtain a high-strength light ceramic material; and mechanically smashing and sieving to obtain a light refractory raw material of which the size is 0.5-10 millimeters. The preparation method is characterized in that a high-strength and ultra-light refractory raw material can be prepared; the floating phenomenon can be avoided when the light refractory raw material is taken as a light unshaped refractory material; and moreover, a process is simple, used raw materials are low in cost, and industrial production is easy.