GB/T 16661-2018 in English
VALIDCerium carbonate
- Issued on:2018-06-07
- Implemented on:2019-01-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 16661-2018碳酸铈》由TC229（全国稀土标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
In-depth interpretation of GB/T 16661—2018 cerium carbonate standard
Analysis of standard formulation background and technological evolution
Cerium carbonate (Cerium carbonate), as an important rare earth compound, is widely used in polishing powder, automobile exhaust purification catalyst, engineering plastic pigment and other fields. The revision of GB/T 16661—2018 standard was drafted based on the rules of GB/T 1.1—2009 and replaced the previous GB/T 16661—2008 version, mainly optimizing and upgrading the chemical composition, test methods and quality requirements.
Comparative Analysis of Standard Frameworks
| Standard Version | Revised Content | Scope of Application | Chemical Composition Requirements |
|---|---|---|---|
| GB/T 16661—2008 | Does not include detailed indicators for non-rare earth impurities, and the number of grades is limited | Only applicable to chemical preparation | Some technical indicators are relatively strict |
| GB/T 16661—2018 | Added new grade classification, optimized non-rare earth impurity indicators | Expanded to multiple industry applications | Added specific requirements for rare earth and non-rare earth impurities |
Chemical composition and grade classification interpretation
Cerium carbonate is divided into five grades according to its chemical composition, as follows:
- Ce₂(CO₃)₄·5H₂O (character grade: Ce-4N5)
- Ce₂(CO₃)₃·4H₂O (character grade: Ce-3N)
- Ce₂(CO₃)₃·3H₂O (character grade: Ce-3N5)
- Ce₂(CO₃)₃·2H₂O (character grade: Ce-2N)
Chemical composition requirements comparison table
| Project | 023245 | 023240 | 023235 | 023230 |
|---|---|---|---|---|
| CeO₂/REO is not less than (%) | 99.995 | 99.99 | 99.95 | 99.9 |
| La₂O₃ is not greater than (%) | 0.001 | 0.003 | 0.02 | 0.1 |
| Fe₂O₃ not more than (%) | 0.001 | 0.002 | 0.005 | 0.01 |
Implementation Suggestions and Precautions
Case Study:In actual production, enterprises should choose the appropriate grade according to specific uses. For example, for the production of high-performance polishing powder, it is recommended to use high-purity 023245 grade (Ce-4N5), which has the lowest content of rare earth impurities and non-rare earth impurities, suitable for high-end application needs.
Quality Control: It is recommended that enterprises strictly follow the standard requirements during the procurement, production and sales process, especially the chemical composition analysis and numerical rounding. GB/T 14635 and GB/T 12690.7 methods can be used to accurately determine rare earth impurities and non-rare earth impurities.
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