$Chemical analysis of refractories containing alumina, zirconia and silica. Refractories containing 5 percent to 45 percent of ZrO2 (alternative to the X-ray fluorescence method) - Apparatus, reagents and dissolution$

Chemical analysis of refractories containing alumina, zirconia and silica. Refractories containing 5 percent to 45 percent of ZrO2 (alternative to the X-ray fluorescence method) - Apparatus, reagents and dissolution

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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.