GB/T 3520-2024 in English
VALIDTest method for fineness of graphite
- Issued on:2024-10-26
- Implemented on:2025-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$204.00
《GB/T 3520-2024石墨细度试验方法》由TC406（全国非金属矿产品及制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
1. Standard Overview and Update Background
GB/T 3520—2024 is the latest standard for graphite fineness test method, replacing the previous GB/T 3520—2008. The new standard has made important updates in terms of scope of application, definition of terms, sample preparation and test methods (including the newly added laser diffraction method).
2. Detailed explanation of core test methods
| Test method | Measurement range | Key equipment | Applicable scenarios |
|---|---|---|---|
| Negative pressure sieving method | Not less than 38 μm | Rotary airflow sieve, balance, stopwatch | Applicable to coarse graphite particle distribution analysis |
| Vibrating sieve method | Not less than 38 μm | Vibrating sieve, test sieve, balance | Suitable for rapid screening of medium-sized graphite particles |
| Laser diffraction method | No more than 38 μm | Laser diffraction particle size analyzer, ultrasonic disperser | Precise determination of fine-grained graphite distribution |
3. Technological evolution and industry impact
The introduction of the laser diffraction method has significantly improved the accuracy and efficiency of graphite fineness testing, especially in the analysis of particles no more than 38 μm. This method achieves uniform distribution of the sample through dispersants and ultrasonic treatment, and conducts a comprehensive evaluation in combination with the particle size distribution data table and cumulative particle size (such as D10, D50, D90).
Case Study: Practical Application of Graphite Fineness
A new energy materials company used the laser diffraction method to test the particle size distribution of graphite negative electrode materials. The results showed that the D50 value was optimized from the previous 12 μm to 8 μm, significantly improving battery performance.
4. Implementation Recommendations and Best Practices
- Equipment Calibration:Regularly calibrate the test sieve and particle size analyzer to ensure measurement accuracy.
- Operational Specifications:Strictly follow the sample preparation steps in the standard, especially the drying and dispersion processes.
- Data Analysis:It is recommended to use statistical tools to analyze the result deviation, especially when the difference between parallel measurements exceeds 2.0%.
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