The influence of BaO(2%~8%)on melting and crystalline temperature of concasting mold powder-3~  5 MgO

1~2 Al₂O₃

8Na₂O

3～4B₂O₃

2Li₂O

3～4 Cand the crystalline phases of free fluoride mold fluxes have been studied and analyzed. The results showed that with increasing BaO content from 2% to 8%

the melting temperature of mold powder decreased obviously from 1053 ℃ to 1011 ℃ while the crystalline temperature decreased minor from 954 ℃ to 948℃;the crystalline mineral phase of free fluoride mold fluxes was melilite which was solid solution of aluminium- melilite(Ca₂Al₂SiO₇)

akermanite(Ca₂MgSi₂O₇)and sodium-melilite(NaCaAlSi₂O₇)

and it is available through adjustment of crystalline rate of melilite in fluxes to control the heat transfer between mold and shell of strand.