i)  Growth of deoxidation product

ii)  Movement through molten steel to surface

iii)  Absorption of inclusion by a suitable designed synthetic slag.

Floatation of an oxide product depends among physical properties of steel, on the size of the product. The rate of rise of a spherical particle in a quiet fluid or in a fluid of laminar flow (i.e. at very low Reynold’s number) can be described at steady state by Stoke’s law: 

(8)

 terminal velocity of the inclusion, g is  acceleration due to gravity ,  deiffernce in density of steel and deoxidation product and  is viscosity of steel .

Deoxidation products are lighter than steel; hence they move up. According to equation 8 the rising velocity is proportional to square of the size of the deoxidation product. Larger sizes move faster. Moreover different sizes of de oxidation product will move with different velocities. During their movement, they may collide with one another. Stirring of melt may help floating of de oxidation products.

Degree of stirring in the melt is important. Vigorous stirring may not be of much help since deoxidation product may be circulated in the liquid.

For the removal of deoxidation product, equally important is the design of synthetic slag to absorb the deoxidation product.