Preparation method of magnesium oxide-zirconium oxide complex-phase porous high-thermal-shock-resistance refractory block

The invention discloses a preparation method of a magnesium oxide-zirconium oxide complex-phase porous high-thermal-shock-resistance refractory block. According to the invention, fused magnesite powder or sintered magnesite powder is used as a raw material, dextrin, methylene cellulose or resin is used as a binding agent, and a slurry required by 3D printing is prepared. The magnesium oxide-zirconium oxide complex-phase porous high-thermal-shock refractory block can be obtained through 3D printing forming, drying, primary sintering, zirconium oxide sol dipping secondary drying and secondary sintering. The matrix of the magnesium oxide-zirconium oxide complex-phase porous high-thermal-shock refractory block prepared by the method is molded by adopting a 3D printing technology, so that the size and distribution of pores can be designed. And a zirconia sol infiltration matrix sintering process is adopted, so that the sintering of the refractory block is promoted, and the strength of the block is improved. Throug