Compare the fluxing effect of boron sludge and CaF_2 on CaO-based steelmaking slag

摘要

To reduce the pollution caused by employing CaF_2 as fluxing agent in metallurgical flux, boron sludge is used as fluxing agent to substitute for CaF_2. The melting temperatures of CaO-SiO_2-Fe_2O_3 -boron sludge system were investigated. The melting temperature of CaO-SiO_2-Fe_2O_3-boron sludge slag system is increased with the increase of co(CaO)/ω)(SiO_2)at first, and then fluctuates at about 1430°C. Moreover, the melting temperature of CaO-SiO_2-Fe_2O_3-boron sludge system is decreased with the increase of boron sludge content at first and then increased, 7% content of boron sludge has the best fluxing effect and the melting temperature is 1445°C. As a conclusion, the fluxing effect of boron sludge is close to CaF_2, boron sludge may be considered to substitute for CaF_2.