GB/T 6901.1-2004 English PDF (GBT6901.1-2004)

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GB/T 6901.1-2004: Chemical analysis of silica refractories -- Part 1: Determination of loss on ignition -- Gravimetric method
GB/T 6901.1-2004
GB
ICS 81.080
Q 40
National Standard
of the People’s Republic of China
Replacing GB/T 6901.1-1986
Chemical analysis of silica refractories - Part 1.
Determination of loss on ignition - Gravmetric
method
ISSUED ON. JANUARY 19, 2004
IMPLEMENTED ON. JULY 1, 2004
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Principle ... 5 
4 Instruments ... 5 
5 Sampling ... 6 
6 Analysis procedures ... 6 
7 Calculation of analysis results ... 7 
8 Tolerance ... 7 
9 Quality assurance and control... 8 
10 Test report ... 8 
Annex A ... 9 
Foreword
GB/T 6901 “Chemical analysis of silica refractories” contains the following 11 parts.
— Part 1. Determination of loss on ignition - Gravmetric method
— Part 2. Determination of silicon dioxide - Gravimetric-molybdenum blue
photometric method
— Part 3. Determination of silicon dioxide - Hydrofluoric acid gravimetric method
— Part 4. Determination of iron oxide content - Phenanthroline photometric method
— Part 5. Determination of aluminium oxide - Chromazurol S photometric method
— Part 6. Determination of aluminium oxide - EDTA volumetric method
— Part 7. Determination of titanium dioxide - Diantipyrylmethane photometric
method
— Part 8. Determination of calciuim oxide and magnesium oxide - Atomic
absorption spectrophotometric method
— Part 9. Determination of potassium oxide and sodium oxide - Atomic absorption
spectrophotometric method
— Part 10. Determination of manganese oxide - Atomic absorption
spectrophotometric method
— Part 11. Determination of phosphorus pentoxide - Molybdenum blue photometric
method
This Part is the first part of GB/T 6901.
The Part replaces GB/T 6901.1-1986 “Chemical analysis of silica refractories -
Determination of loss content on ignition by gravimetric method”.
Compared with GB/T 6901.101986, the major changes of this Part are as follows.
— ADD chapters - foreword, normative reference, quality assurance and control,
and test report;
— SPECIFY the sample preparation, INCREASE the operability;
— EXTEND “the determination range (mass fraction) is 0.10%~2.00%” TO “the
determination range (mass fraction) is ≤ 10.00%”;
Chemical analysis of silica refractories
Part 1. Determination of loss on ignition –
Gravmetric method
1 Scope 
This Part specifies the determination of loss content on ignition by gravimetric
method.
This Part applies to the determination of loss content on ignition in silica refractories.
The determination range (mass fraction) is not more than 10.00%.
2 Normative references 
The provisions in following documents become the provisions of this Part through
reference in this Part. For dated references, the subsequent amendments (excluding
corrections) or revisions do not apply to this Part, however, parties who reach an
agreement based on this Part are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced
document applies.
GB/T 8170 Rules for rounding off of numberical values
GB/T 10325 Shaped refractory products - Sampling and acceptance testing
GB/T 17617 Refractory products - Sampling of raw materials and unshaped
products
3 Principle 
Samples are ignited to a constant weight at 1,050°C±50°C. CALCULATE the loss
content on ignition base on the loss.
4 Instruments 
4.1 Balance (sensibility is 0.1mg).
4.2 Platinum or porcelain crucibles (30mL).
WEIGH it. REPEAT igniting (15min each time) and WEIGH it, until it becomes
constant (when the loss content on ignition is not more than 1%; the difference of the
two times of ignition weight is not greater than 0.2mg; when the loss content on
ignition is more than 1%, the difference is not greater than 0.4mg, that is, constant).
7 Calculation of analysis results 
7.1 The loss content on ignition, expressed as mass friction ω (loss content on
ignition), with the value expressed in terms of %, is calculated according to the
following formula.
100m
m-mignition)on content (loss 21 
Where,
m1 - the value of the total mass of the sample before ignition and crucible, in the
units of grams (g).
m2 - the value of the total mass of the sample after ignition and crucible, in the units
of grams (g).
m - the value of the mass of the sample, in the units of grams (g).
7.2 Whether the analysis value is effective depends firstly on whether the analysis
value of the reference material analyzed under repeatability conditions is consistent
with the reference value. When the difference between the analysis value of the
reference material and the reference value is not more than 0.7 time of the tolerance
as stated in Table 1, the analysis value of the sample is effective; otherwise, it is
ineffective.
7.3 When the acquired difference of the two effective analysis values of the samples
is not more than the tolerance as stated in Table 1, the arithmetic mean value of them
shall be deemed as the final analysis result; otherwise, additional analysis and data
processing shall be made according to Annex A.
7.4 The acquired results shall be rounded to two decimal places according to GB/T
8170; when the content is less than 0.10%, the result shall be rounded to two
significant digits. If there are other requirements in the contract or relevant standards,
the result can be rounded off according to the requirements.
8 Tolerance 
The difference of the two independent test results acquired under repeatability