1 Scope
This standard specifies the chemical analysis of refractories containing chrome. The items analyzed in this standard are as follows:
a) loss on ignition (LOI);
b) silicon dioxide (SiO2);
c) iron oxide (Fe2O3);
d) aluminum oxide (Al2O3);
e) titanium dioxide (TiO2);
f) calcium oxide (CaO);
g) magnesium oxide (MgO);
h) chromic oxide (Cr2O3);
i) potassium oxide (K2O);
j) sodium oxide (Na2O);
k) manganese oxide (MnO).
The determination range for analytical elements applicable in this standard is given in Table 1.
Table 1 Determination range
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2 Normative references
The following normative documents contain provisions which, through reference in this part, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply to this part.
GB/T 6900-2006 Chemical analysis of alumina-silica refractories
GB/T 7728-1987 Chemical analysis of metallurgical products - General rule for flame atomic absorption spectrometric methods
GB/T 8170 Rules for rounding off of numerical values
GB/T 10325 Shaped refractory products - Rule of acceptance, sampling and inspection
GB/T 12805-1991 Laboratory glassware - Burettes (neq ISO 385:1984)
GB/T 12806-1991 Laboratory glassware - One-mark volumetric flasks (eqv ISO 1042:1983)
GB/T 12808-1991 Laboratory glassware - One-mark pipettes (eqv ISO 648:1977)
GB/T 17617-1998 Refractory products - Sampling of raw materials and unshaped products (neq ISO 8656-1:1988)
3 Instruments and apparatus
3.1 Balance (with sensibility of 0.1mg).
3.2 Platinum crucible or porcelain crucible (30mL).
3.3 Automatic temperature-controlled drying oven.
3.4 High temperature furnace: electric box furnace with maximum service temperature ≥1 100℃ and capable of controlling temperature automatically.
3.5 Spectrophotometer.
Foreword i
1 Scope
2 Normative references
3 Instruments and apparatus
4 Preparation of test sample
5 General
6 Test report
7 Determination of loss on ignition
8 Determination of silicon dioxide
9 Determination of iron oxide
10 Determination of aluminum oxide
11 Determination of titanium dioxide
12 Determination of calcium oxide
13 Determination of magnesium oxide
14 Determination of chromic oxide
15 Determination of potassium oxide and sodium oxide
16 Determination of manganese oxide
Annex A (Normative) Procedure of analysis value acceptance
