Refractory Challenges in Lead and Zinc Furnaces
27
Table 2
Chemical analysis of magnesia-chromite brick out of short rotary furnace
wt%
Na
2 O
Al
2 O
3
MgO
SiO
2
SO a
3
CaO
Cr
2 O
3
Fe
2 O b
3
PbO
ZnO
Hot face c
2.0
4.0
39.0
4.0
3.0
2.0
11.0
26.0
8.0
0.4
Unused d
7.0
60.5
1.5
0.4
19.0
11.6
a
sulfur calculated as SO
3
b
total iron calculated as Fe
2 O
3
c
standardless semiquantitative XRF analysis on original sample
d
quantitative XRF analysis on ignited sample (1050 °C)
27
Table 2
Chemical analysis of magnesia-chromite brick out of short rotary furnace
wt%
Na
2 O
Al
2 O
3
MgO
SiO
2
SO a
3
CaO
Cr
2 O
3
Fe
2 O b
3
PbO
ZnO
Hot face c
2.0
4.0
39.0
4.0
3.0
2.0
11.0
26.0
8.0
0.4
Unused d
7.0
60.5
1.5
0.4
19.0
11.6
a
sulfur calculated as SO
3
b
total iron calculated as Fe
2 O
3
c
standardless semiquantitative XRF analysis on original sample
d
quantitative XRF analysis on ignited sample (1050 °C)