GB/T 6901-2017 in English
VALIDChemical analysis of silica refractories
- Issued on:2017-09-29
- Implemented on:2018-08-01
- File Format:PDF
- Delivery:Via email within 5 business days
$476.00
《GB/T 6901-2017硅质耐火材料化学分析方法》由TC193（全国耐火材料标准化技术委员会）归口，TC193SC3（全国耐火材料标准化技术委员会试验方法分会）执行，主管部门为国家标准化管理委员会。
Introduction
Interpretation of the core content of the standard
| Analysis method | Determination range | Main equipment | Technical features |
|---|---|---|---|
| Hydrofluoric acid gravimetric method | SiO₂≥94% | Platinum crucible, high temperature furnace | Classic method, high precision |
| ICP-OES method | Each oxide ≤15% | Inductively coupled plasma emission spectrometer | Simultaneous determination of multiple elements |
| Atomic absorption method | CaO≤5%, MgO≤2% | Atomic absorption spectrometer | Good element selectivity |
Key technological innovations
Compared with the 2008 edition, the 2017 edition has the following major improvements:
- Added Inductively coupled plasma emission spectrometry for determination of low-content elements (Chapter 16)
- Expanded the detection range of manganese monoxide and phosphorus pentoxide
- Optimized the determination method of loss on ignition (modified Chapter 7)
Typical analysis process example
Silicon dioxide determination (hydrofluoric acid gravimetric method)
Steps:
- The sample is determined>Platinum crucible 1000-1100℃ burn to constant weight
- Add HF+HNO₃ to dissolve and evaporate
- Use nitric acid to drive out fluorine and then burn and weigh again
- Calculate SiO₂ content by the difference between the two masses
Calculation formula: w(SiO₂)=[(m₁-m₂)+(m₃-m₄)]/m×100%
Implementation suggestions
- For high silicon samples (SiO₂≥98%), the subtraction method is recommended
- ICP-OES method is preferred for multi-element analysis
- Pay attention to blank test and verification with standard substances
Quality assurance requirements
| Control items | Requirements |
|---|---|
| Standard curve calibration | ≤3 months/after maintenance |
| Standard solution calibration | ≤2 months or ΔT>10℃ |
| Allowance verification | Standard material deviation≤0.7 times the allowance |
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