When the reaction products form as high meltingpoint CA2, CA6 and MA spinel in a continuous solid phase it will clog the liquid channel and resist the further diffusion of fused slag in the brick.
In the liquid steel refining process the basicity of top slag can be increased, the meltingpoint of the slag decreased and the fluidity improved by adding certain amount of active lime.
These natural minerals with low meltingpoint, accelerate the dissolution of lime, and form a slag of high basicity and good fluidity suitable for desulphurization.