Standard No.:	GB/T 5070-2007
Chinese Name:	含铬耐火材料化学分析方法
English Name:	Chemical analysis of refractories containing chrome
Professional Classification:	Q43 Basic refractory
Professional Classification:	GB National Standard
ICS Classification:	81.080
Issued by:
Issued on:	2007-04-18
Implemented on:	2007-10-01
Status:	ABOLISHED
Replace:	GB/T5070.1-2002 Chemical analysis of magnesia chromite refractories-Part 1: Determination of loss on ignition-Gravimetric method
Language:	English
File Format:	PDF
Word Count:	13000 words
Price(USD):	390 (USD)
Delivery:	via email in 1-3 business day

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.