Taking bauxite and talcum powder as refractory aggregates

sodium bentonite and CMC as suspending agent

hexametaphosphate and water glass as compound binder as well as water as the carrier with appropriate antifoaming agent and surfactant

bauxite coating was prepared

in which CMC is0.5%

water glass is 5%and sodium hexametaphosphate is 6%（the amount of each additive is the mass percentage of aggregate）.By changing the amount of sodium bentonite

based on testing the coating density

pH value

viscosity

suspension

strength

leveling

smearing and dripping properties

the effect of sodium bentonite on the coating performance was analyzed.The results reveal that the coating has the desirable comprehensive performance with 5% sodium bentonite.