GB/T 3518-2023 (GB/T3518-2023, GBT 3518-2023, GBT3518-2023) & related versions
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GB/T 3518-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.080
CCS Q 51
Replacing GB/T 3518-2008
Flake Graphite
鳞片石墨
ISSUED ON: DECEMBER 28, 2023
IMPLEMENTED ON: JULY 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Classification and Label ... 6
5 Technical Requirements ... 7
6 Test Methods ... 19
7 Inspection Rules ... 22
8 Marking, Packaging, Transportation and Storage ... 23
Flake Graphite
WARNING: personnel using this document must have practical experience in laboratory
work. This document does not point out all safety, health and environmental issues related
to its use. Users are responsible for taking appropriate safety, health and environmental
measures, and ensuring the compliance with relevant national laws and regulations.
1 Scope
This document specifies the classification, label, technical requirements, test methods,
inspection rules, marking, packaging, transportation and storage of flake graphite.
This document is applicable to flake graphite products obtained from natural graphite ore
through mineral processing and enrichment.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 3520 Test Method for Fineness of Graphite
GB/T 3521 Method for Chemical Analysis of Graphite
GB/T 6003.1 Test Sieves - Technical Requirements and Testing - Part 1: Test Sieves of Metal
Wire Cloth
GB/T 6679 General Rules for Sampling Solid Chemical Products
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
DZ/T 0118 The Specifications of the Standard Sieves Vibrating Screen for Laboratory
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 flake graphite
Natural crystalline graphite that is shaped like fish scales, belongs to the hexagonal crystal
system, and has a layered structure.
NOTE: it is equivalent to crystalline graphite in geological exploration. The schematic diagram of
5.2 The iron content (mass fraction) of high-purity graphite shall not be greater than 100 mg/kg;
the iron content (mass fraction) of high-carbon graphite shall not be greater than 1.00%; the
iron content (mass fraction) of medium-carbon graphite shall not be greater than 1.50%; the
iron content (mass fraction) of low-carbon graphite shall not be greater than 2.00%.
5.3 The sulfur content (mass fraction) of high-purity graphite shall not be greater than 100
mg/kg; the sulfur content (mass fraction) of high-carbon graphite shall not be greater than
0.50%; the sulfur content (mass fraction) of medium-carbon graphite shall not be greater than
1.00%; the sulfur content (mass fraction) of low-carbon graphite shall not be greater than 1.50%.
5.4 Artificially recreated flake graphite shall not be contained.
6 Test Methods
6.1 Fixed Carbon Content, Volatile Matter, Moisture, Iron Content and Sulfur
Content
The determination of fixed carbon content, volatile matter, moisture, iron content and sulfur
content of flake graphite shall comply with the stipulations of GB/T 3521.
6.2 Weight of Screen Residue
The determination of the weight of screen residue of flake graphite shall comply with the
stipulations of GB/T 3520.
6.3 Artificially Recreated Flake Graphite
6.3.1 Method and principle
The particle size of natural flake graphite that has been ultrasonically treated in water or sulfuric
acid solution will not change, but the particle size of artificially recreated flake graphite will
change. Through this principle, it can be identified whether natural flake graphite contains
artificially recreated flake graphite.
6.3.2 Reagents and materials
6.3.2.1 Water: not lower than the requirements of Grade-3 water specified in GB/T 6682.
6.3.2.2 Concentrated sulfuric acid: with a density of 1.84 g/cm3.
6.3.2.3 Rapid qualitative filter paper.
6.3.3 Instruments and equipment
6.3.3.1 Balance: with an accuracy of not lower than 0.01 g.
6.3.3.2 Electric drying oven: temperature measurement range: from room temperature to 300
C, with a temperature control accuracy of 2 C.
6.3.3.3 Stopwatch.
6.3.3.4 Standard sieve: mesh size and metal wire diameter shall comply with the stipulations of
GB/T 6003.1.
6.3.3.5 Vibrating sieving machine: complies with the requirements of DZ/T 0118.
6.3.3.6 Ultrasonic cleaning machine for laboratory use.
6.3.3.7 Centrifuge: with a rotation speed of 10,000 r/min ~ 30,000 r/min, and a centrifuge tube
volume of 250 mL.
6.3.4 Test steps
6.3.4.1 Specimen collection
In accordance with the stipulations of GB/T 6679, take 1 kg of specimen, then, use the
quartering method to divide it to 1,000 g. Use the dichotomy to divide the 1,000 g of specimen
obtained through division into 2 specimens, one for specimen screening before the treatment,
and one for specimen screening after the treatment.
6.3.4.2 Weight of screen residue before treatment
6.3.4.2.1 Weigh-take 50.00 g (accurate to 0.01 g) of specimen with moisture (mass fraction)
less than 1% and record it as m. Pour it into the standard sieve with a sieve bottom, put on the
sieve cover, and use a vibrating sieving machine for sieving (the sieving time is determined in
accordance with the mesh size of the standard sieve, for standard sieves with a mesh size greater
than 75 m, perform sieving for 10 minutes; for standard sieves with a mesh size between 75
m and 45 m, perform sieving for 20 minutes).
6.3.4.2.2 Repeatedly perform sieving. After reaching the end of filter, stop the machine and
weigh the mass (m1) of the screen residue before the treatment.
6.3.4.3 Screening residue after treatment
6.3.4.3.1 Weigh 2 portions of 80.00g (accurate to 0.01g) of the sample with moisture (mass
fraction) less than 1%, pour them into 400mL beakers, add 100mL of concentrated sulfuric acid,
stir evenly, and ultrasonicate on the ultrasonic cleaner for 10 minutes. Transfer it into a 250mL
centrifuge tube, and centrifuge for 5 minutes at a centrifuge speed of 15000r/min. Pour the
reacted sulfuric acid into a waste acid bucket. Transfer the graphite in the centrifuge tube into
a 400mL beaker, and wash it with grade-3 water until the pH value of the solution is 5~6, filter
with rapid qualitative filter paper, then place it in an electric drying oven at 105°C ~ 110°C for
3 hours.
6.3.4.3.2 Weigh 50.00g (accurate to 0.01g) from the two samples treated according to 6.3.4.3.1,
record it as m3. Pour into the standard sieve with a sieve bottom, cover the sieve cover and use
a vibrating sieve machine to sieve (the sieving time is determined according to the sieve size of
the standard sieve -- 10 minutes for standard sieves larger than 75μm, 20 minutes for
X3---the difference of the weight of screen residue before and after the treatment;
X1---the weight of screen residue before the treatment;
X2---the weight of screen residue after the treatment.
6.3.6 Result expression
If the difference of the weight of screen residue before and after the treatment (X3) is greater
than 5.0%, then, it shall be determined that the natural flake graphite contains artificially
recreated flake graphite; if the difference of the weight of screen residue before and after the
treatment (X3) is less than or equal to 5.0%, then, it shall be determined that the natural flake
graphite does not contain artificially recreated flake graphite.
7 Inspection Rules
7.1 Classification of Inspection
7.1.1 Exit-factory inspection
The exit-factory inspection items of flake graphite are volatile matter, moisture, weight of
screen residue and artificially recreated flake graphite.
7.1.2 Type inspection
The type inspection items of flake graphite are all items specified in Chapter 5. Under one of
the following circumstances, type inspection shall be carried out:
a) When new products are put into production or product finalization is conducted;
b) During normal production, once a year;
c) When there are major changes in raw materials, production processes and equipment,
etc., which may affect product quality;
d) When production has been suspended for more than one year and resumed;
e) When the exit-factory inspection results are significantly different from the previous
type inspection results.
7.2 Principle of Batch Formation
60 t of bagged or barreled flake graphite stably and continuously produced with the same batch
of raw materials and the same process shall be counted as one batch. When it is less than 60 t,
it shall still be counted as one batch.
7.3 Sampling Method
The sampling method shall comply with the stipulations of GB/T 6679. The sampling size of
each batch shall not be less than 1 kg.
7.4 Determination Rules
7.4.1 When the various product characteristic indicators comply with the requirements of
Chapter 5, the batch of products shall be determined as qualified.
7.4.2 When a certain indicator of the product does not comply with the requirements of Chapter
5, double sampling shall be carried out for a re-inspection of the disqualified item. If the re-
inspection results comply with the requirements of Chapter 5, the batch of products shall still
be determined as qualified; if any item in the re-inspection results fails to comply with the
requirements of Chapter 5, then, the batch of products shall be determined as disqualified.
8 Marking, Packaging, Transportation and Storage
8.1 Marking
The packaging bag of flake graphite shall be marked with product name, label, net content,
production enterprise’s name and address, and rain and moisture-proof signs.
Each batch of products shall be accompanied by a product certificate. The product certificate
shall include product label, product batch No. inspection date, inspection conclusion,
production enterprise’s name and address, and shall also be stamped with the inspection seal of
the production enterprise’s inspection department and the seal of the inspection personnel.
8.2 Packaging
Flake graphite shall be packed in inner-coated woven bags, with a net content of (25 0.25) kg
per bag. Special packaging shall be determined by the supply-side and demand-side through
negotiation.
8.3 Transportation
Product transportation shall be equipped with facilities to prevent the product from rain,
moisture, exposure to the sun, damage and contamination.
8.4 Storage
The product shall be stored in a cool, ventilated and dry place, and facilities shall be provided
to prevent the product from exposure to the sun, rain, moisture and contamination.
......
| Standard ID | GB/T 3518-2023 (GB/T3518-2023) | | Description (Translated English) | Flake graphite | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q51 | | Classification of International Standard | 73.080 | | Word Count Estimation | 18,189 | | Date of Issue | 2023-12-28 | | Date of Implementation | 2024-07-01 | | Older Standard (superseded by this standard) | GB/T 3518-2008 | | Drafting Organization | China Minmetals (Heilongjiang) Graphite Industry Co., Ltd., China University of Geosciences (Wuhan), China National Building Materials Heilongjiang Graphite New Materials Co., Ltd., Wuhan University of Technology, Xianyang Non-Metal Mine Research and Design Institute Co., Ltd., Heilongjiang Baoquanling Farm Reclamation Yixiang Graphite Co., Ltd., Hebei Zhengda Friction Braking Materials Co., Ltd., Jixi Beterui New Energy Technology Co., Ltd., Qingdao Zhengwang New Materials Co., Ltd., Jixi Weida New Materials Technology Co., Ltd., Heilongjiang Baoquanling Nongkenyi Xiang New Energy Materials Co., Ltd., Zhuhai Greili Friction Materials Co., Ltd., Hunan Jinyangene Carbon New Materials Co., Ltd., Qingdao Luowei New Materials Co., Ltd., Qingdao Huateng Graphite Technology Co., Ltd., Qingdao Longdi Carbon Material Technology Co., Ltd., Jixi Graphite Product Quality Supervision, Inspection and Testing | | Administrative Organization | National Technical Committee on Standardization of Non-metallic Mineral Products and Products (SAC/TC 406) | | Proposing organization | China Building Materials Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration |
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