The viscous behavior and potassium removal capacity of CaO–SiO2–8wt%MgO–17wt%Al2O3–2.5wt%BaO–K2O slag

Abstract

The viscous behavior and potassium removal capacity of CaO–SiO2 –8wt%MgO–17wt%Al2 O3 –2.5wt%BaO–K2 O slag system with CaO/SiO2 of 1.07 were studied. The effect of K2 O content ranging from 0 to 5 wt% on the viscosity, slag structure, apparent activation energy and potassium removal rate of present slag were analyzed. The results showed that with increase of K2 O content in slag, the viscosity and apparent activation energy tended to increase. When adding K2 O into the present slag, K+ ion rather than Ba2+ could preferentially compensate [AlO4 ] tetrahedron and more complex network structures would be formed, leading to higher polymerization degree of slag. The potassium removal rate was related to the reduction degree of K+ by carbon, and with rising of temperature and increasing of K2 O content there was a decreasing trend for the potassium removal capacity of slag.