GB/T 6901.3-2004 English PDF (GBT6901.3-2004)

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GB/T 6901.3-2004: Chemical analysis of silica refractories -- Part 3: Determination of silicon dioxide -- Hydrofluoric acid gravimetric method
GB/T 6901.3-2004
GB
ICS 81.080
Q 40
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing GB/T 6901.3-1986
Chemical analysis of silica refractories - Part 3.
Determination of silicon dioxide -
Hydrofluoric acid gravimetric method
ISSUED ON. NOVEMBER 27, 2013
IMPLEMENTED ON. AUGUST 01, 2014
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Principle ... 5 
4 Reagents... 5 
5 Instruments ... 6 
6 Sampling ... 6 
7 Analytical steps ... 6 
8 Calculation of analytical results ... 7 
9 Permissible difference ... 8 
10 Quality assurance and control... 8 
11 Test report ... 8 
Foreword 
GB/T 6901 is divided into 11 parts.
- Part 1. Chemical analysis of silica refractories - Part 1. Determination of loss on
ignition - Gravimetric method;
- Part 2. Chemical analysis of silica refractories - Part 2. Determination of silicon
dioxide - Gravimetric-molybdenum blue photometric method;
- Part 3. Chemical analysis of silica refractories - Part 3. Determination of silicon
dioxide - Hydrofluoric acid gravimetric method;
- Part 4. Chemical analysis of silica refractories - Part 4. Determination of iron oxide -
O-phenanthroline photometric method;
- Part 5. Chemical analysis of silica refractories - Part 5. Determination of aluminium
oxide - Chromazurol S photometric method;
- Part 6. Chemical analysis of silica refractories - Part 6. Determination of aluminium
oxide - EDTA volumetric method;
- Part 7. Chemical analysis of silica refractories - Part 7. Determination of titanium
dioxide - Diantipyrylmethane photometric method;
- Part 8. Chemical analysis of silica refractories - Part 8. Determination of calcium
oxide and magnesium oxide - Atomic absorption spectrophotometric
method;
- Part 9. Chemical analysis of silica refractories - Part 9. Determination of potassium
oxide and sodium oxide - Atomic absorption spectrophotometric method;
- Part 10. Chemical analysis of silica refractories - Part 10. Determination of
manganese oxide - Atomic absorption spectrophotometric method;
- Part 11. Chemical analysis of silica refractories - Part 11. Determination of
phosphorus pentoxide - Molybdenum blue photometric method.
This part is part 3 of GB/T 6901.
This part replaces GB/T 6901.3-1986.
Compared with GB/T 6901.3-1986, the major changes of this part are as follows.
- ADD the preface, normative references, quality assurance and control, test
reports of each chapter;
- SPECIFIY the sample preparation in detail. IMPROVED the operability;
- ADD provision of rounding digits of analysis value. And it allows the use of other
provisions;
- According to GB/T 1.1-2000 and GB/T 20001.4-2001, ADJUST the structure and
format of this part.
This part was proposed by China Iron and Steel Association.
This part shall be administered by National Refractories Standardization Technical
Committee refractories (SAC/TC 193).
Drafting organizations of this part. Luoyang Institute of Refractories Research, Shanxi
Xixiaoping Refractories Co., Ltd., and Chongqing Special Steel Co.
The main drafters of this part. Liang Xianlei, Guo Qiuhong, Zhang Huirong, Deng
Xiangqing, and Tang Shubeng.
The previous version replaced by this part is.
- GB/T 6901.3-1986.
Chemical analysis of silica refractories - Part 3.
Determination of silicon dioxide -
Hydrofluoric acid gravimetric method
1 Scope 
This part specifies the hydrofluoric acid gravimetric method to determine silicon
dioxide.
This part applies to the determination of silicon dioxide in silica refractories.
Measuring range (mass fraction) is greater than 95.00%.
2 Normative references   
GB/T 6901.1-2004 Chemical analysis of silica refractories - Part 1. Determination of loss
on ignition - Gravimetric method
GB/T 8170 Rules of rounding off for numerical values and expression and judgement of
limiting values
GB/T 10325 Shaped refractory products - Rule of acceptance, sampling and inspection
GB/T 17617 Refractory products - Sampling of raw materials and unshaped products
3 Principle   
After the sample is burned to the constant, USE hydrofluoric acid and nitric acid to
dissolve. EVAPORATE it to remove the silicon. Then USE nitrate to remove fluoride.
BURN at 1000 °C - 1100 °C to constant weight. The difference between the 2
weighings is the amount of silicon dioxide.
4 Reagents   
4.1 Nitrate (ρ1, 42 g/mL).
4.2 Hydrofluoric acid (40%).
- Test date.