Using Factsage thermodynamic software to calculate in combination with laboratory research

the effects of basicity( 0.8 ～1.2 )

BaO( 5% ～15% ) and B

2

O

3

( 5% ～15% )content on mineralogical phases precipitation of CaO-SiO

2

- Al

2

O

3

-CaF

2

-Na

2

O-MgO series mold fluxes for Fe-Ni-Cr corrosion resistant alloy during cooling are investigated. Results show that with the basicity of slag increasing form 0. 8 to 1. 2

the crystallization temperature increases from 1 201.7°C to 1 256. 4 °C ;the

amount of precipitation of silicate minerals in slag decreases from 83. 1% to 79. 6% ;with the BaO content in the slag W10%

the crystal precipitation in the slag will be inhibited with the increase of BaO content. When 10% BaO is added to the slag

the total amount of crystal precipitation decreases to 61. 1 %. When 10% B

2

0

3

is added to slag

the crystallization temperature decreases to 1 086

7 °C

and crystal precipitation is reduces to 66. 3% ;with B

2

O

3

not less than 10%

and the phase formed by the slag is glass phase. The optimized basicity of slag is 1.0

and the added amaunt of BaO or B

2

O

3

is 10% .