1 Scope
This part of ISO 21079 specifies methods for the chemical analysis of AZS (alumina, zirconia, and silica)
refractory products (containing 5 % to 45 % of ZrO2) and raw materials, using traditional (“wet”) methods, inductively coupled plasma
atomic emission (ICP-AE) spectrometry and flame atomic absorption (FAA) spectrometry.
It covers apparatus, reagents and dissolution methods.
The range of determination is given in Table 1.
Table 1
—
Range of determination (% by mass)
| Component |
Range |
Component |
Range |
NOTE The values other than LOI are on an ignited basis.
|
| LOI |
–1 to 40 |
MgO |
0,01 to 2 |
| SiO2
|
0,1 to 45 |
Na2O |
0,01 to 3 |
| Al2O3
|
1 to 80 |
K2O |
0,01 to 1 |
| Fe2O3
|
0,01 to 2 |
Cr2O3
|
0,01 to 3 |
| TiO2
|
0,01 to 5 |
ZrO2
|
5 to 45 |
| CaO |
0,01 to 2 |
HfO2
|
0,01 to 2 |
This part of ISO 21079 is not applicable to MgO-based refractories.
NOTE This part of ISO 21079 gives alternatives to the X-ray fluorescence (XRF) method given in ISO 12677.