Continuous casting mold powder for ferrite stainless steel and preparation method thereof

The invention discloses continuous casting mold powder for ferrite stainless steel and a preparation method thereof. The mold powder comprises the following components in percentage by weight: 20-40% CaO, 30-50% of SiO2, 35-10% of Al2O, 1-5% of MgO, 1-15% of Na2O, 1-10% of CaF2, 1-5% of Li2O and 2-8% of C, wherein the particle size is 0.5-1.5 millimeters. The preparation method comprises the following steps: (1) crushing and uniformly mixing carbon material, wollastonite, waste ash, limestone, soda ash and cryolite, and adding lithium hydroxide into the mixture to obtain a lithium-doped material; (2) adding water and stirring to obtain slurry; and (3) drying the slurry and preparing powdery continuous casting mold powder for ferrite stainless steel; or making the slurry into particles by a spraying granulation method, and roasting to obtain the continuous casting mold powder for ferrite stainless steel. According to the invention, the viscosity, melting temperature, crystallization rate and dissolution and ab