phase relations in cao-sio2-nd2o3 system at 1600oc
DESCRIPTION
Phase relations in rare earth oxides containing slag systems and rare earths (Res) recycling Res containing slags’ main components: CaO, SiO2, Al2O3 Rare earths issues Recycling rare earths Solution to enhance potential of metals recovery and slag recycling? Slag properties? Slag treatment processes Unknown form previous studies: liquidus surface, phase regionsTRANSCRIPT
05/03/23 KU Leuven|MTM|HiTemp 1
PHASE RELATIONS IN CaO-SiO2-Nd2O3 SYSTEM
AT 1600oC
Thu Hoai LE, Annelies MALFLIET, Bart BLANPAIN and Muxing GUO
05/03/23 KU Leuven|MTM|HiTemp 205/03/23 KU Leuven|MTM|HiTemp 2
Phase relations in rare earth oxides containing slag systems and rare earths (Res) recycling Rare earths issues Recycling rare earths Solution to enhance
potential of metals recovery and slag recycling?
Slag properties? Slag treatment processes Unknown form previous
studies: liquidus surface, phase regions
Res containing slags’ main components: CaO, SiO2, Al2O3
05/03/23 KU Leuven|MTM|HiTemp 3
Ar
S
M
MFC
Oxygen sensor
Water-cooledflange
Water-cooledflange
Isothermal equilibrium experiment
M: MagnesiumS: Silica gelMFC: Mass Flow Controller
Methodology: High temperature equilibration Quenching technique
Experimental conditions: Pt-20%Rh crucible Ar atmosphere Temperature: 1600oC
Characterization: EPMA-WDS: quantitative analysis XRD: recognize phases in solid
state equilibrium samples EBSD: determine liquid/solid
phases
05/03/23 KU Leuven|MTM|HiTemp 4
Phase diagram construction
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
L+TC
+C2S
(Nd2
O3)
C2S
(Nd2
O3)
+Nd2
O3
Ternary compound (TC)
Nd2
O3+
TC+C
2S(N
d2O
3)
C3S
(Nd2
O3)
+C2S
(Nd2
O3)
+Nd2
O3
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
Liquid
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
Nd2O3
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
SiO2
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
C3S(Nd2O3)
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
C2S(Nd2O3)
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
SiO2-Nd2O3
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100
C2S
C2S+L
x=0.7
x=0.1
3
4
2
1
2
Boundary
CaO-SiO2
Tie line
2
x=0
Liquid (L)
L+SiO2
C2S+L
TC+L
C3S0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100Literature:
CaO SiO2
Nd2O3
Experiment:
0 20 40 60 80 100
0
20
40
60
80
100 0
20
40
60
80
100 SiO2-Nd2O3
05/03/23 KU Leuven|MTM|HiTemp 5
Application- Thermodynamic database development for Res oxide
systems- Recycling of Res: modify slag composition, further slag
treatment to optimize recycling process
05/03/23 KU Leuven|MTM|HiTemp 6
Thank you for your attention!