| Abstract Scope |
In steel continuous casting, mold flux is critical for high-quality production. The key roles of mold flux include optimal lubrication and heat transfer. Traditionally, CaF2 is added to reduce the melting point and regulate heat transfer. However, significant volatilization can occur leading to gaseous fluorine compounds and corrosion in the casting equipment. Despite its long-standing use, environmental regulations necessitate alternatives to CaF2.
CaCl2, as a substitute, may be alternative without adverse effects. This study fixed the CaO/SiO2 ratio at 1.2, varying CaCl2 from 5 to 20 mass percent. Viscosity measurements from 1823K to the break temperature (Tbr) demonstrated lower viscosities with higher CaCl2 content and subsequently lowered the Tbr. Raman spectral analysis revealed shifts to lower wavenumbers, increased Q0 and Q2 fractions, and decreased Q1 and Q3 fractions, leading to a reduced Q3/Q2 ratio. This suggests that Cl- ions function as a network modifier, facilitating the depolymerization of silicon-oxygen tetrahedra. |