Effect of slag basicity and oxygen potential on the distribution of boron and phosphorus between slag and silicon

The distribution of boron and phosphorus between Al2O3–CaO–MgO–SiO2 and Al2O3–BaO–SiO2 slags and silicon metal was examined for the purposes of establishing the possibility of refining metallurgical-grade silicon to solar grade silicon. Distribution coefficients of B and P were normalized with the estimated oxygen partial pressure of the system to isolate the influence of basicity as the composition of the slag was varied in terms of the …