Ceramic slate with colored jade effect and preparation method thereof

A preparation method for a ceramic slate with a colored jade effect, comprising:

• pressing and forming raw materials containing a ceramic base material and colored glass fragments to obtain a ceramic green body, wherein the colored glass fragments account for 3 wt % to 5 wt % of the ceramic base material;
• the chemical composition of the ceramic base material includes, in percentage by mass:
• SiO2:
• 65% to 69%;
• Al2O3:
• 18% to 22%;
• and alkali metal oxide:
• 4% to 9%;
• the colored glass fragments have a particle size of 6 to 8 mesh and the chemical composition of the colored glass fragments includes, in percentage by mass:
• SiO2:
• 65% to 70%;
• Al2O3:
• 2% to 4%;
• Fe2O3:
• 0.2% to 0.4%;
• CaO:
• 8% to 10%;
• MgO:
• 1% to 2%;
• K2O:
• 0.5% to 1%;
• Na2O:
• 10% to 15%;
• P2O5 0.2% to 0.4%;
• BaO:
• 0.1% to 0.3%;
• Cr2O3:
• 0.1% to 0.2%;
• and SO3:
• 0.1% to 0.2%;
• the linear expansion coefficient of the colored glass fragments at 0° C. to 400° C. is 6.8×10−6/K to 7.2×10−6/K, the linear expansion coefficient of the ceramic base material at 0° C. to 400° C. is 7.0×10−6/K to 7.8×10−6/K, and a difference in linear expansion coefficient between the colored glass fragments and the ceramic base material at 0° C. to 400° C. is not greater than 0.2×10−6/K to 0.6×10−6/K;
• drying and firing the ceramic green body;
• and
• polishing the fired ceramic green body taken out of the kiln to give the ceramic slate with a colored jade effect;
• wherein after polishing, particles with colored jade effect are distributed on the surface of the ceramic body;
• and
• the ceramic slate does not have pigment dispersion and has micro-protrusions with a height of less than 0.2 mm on the surface of the ceramic slate.