Development of granular materials for fluidized bed process: measuring attrition resistance with a horizontal ball milling device and its mathematical description
| Autor: | Colin Debras, Noemie van Garderen, Frank Clemens, Thomas Graule, Yujing Liu, B. Minisini |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Abrasion (mechanical) 020209 energy General Chemical Engineering Mechanical engineering 02 engineering and technology Test method Granular material medicine.disease Characterization (materials science) 020401 chemical engineering Fluidized bed 0202 electrical engineering electronic engineering information engineering medicine Particle Attrition 0204 chemical engineering Ball mill Simulation |
| Zdroj: | Powder Technology. 288:157-163 |
| ISSN: | 0032-5910 |
| Popis: | Attrition caused granulates degradation (abrasion or fragmentation) is often encountered in fluidized bed processes. Efforts to investigate attrition induced bed materials mass loss or size change require suitable test methods to track the occurrence of respective attrition modes (abrasion, fragmentation, or both) and clarify their individual influences. In this work, an easy operated horizontal ball milling test method, eligible for small amount test material and thorough collection of attrition generated fines, was developed. With this test setup, a wide range of attrition modes can be ‘created’, simply by changing the geometrical size of the ball milling media or the weight ratio between ball milling media and tested sample. Thanks to the knowledge of Epstein's particle rate-breakage theory and Austin equation, a two-parameter mathematical descriptive equation y = AXb1eb2(X − 1), including both abrasion term and fragmentation term, is developed. Solutions obtained from least square method, b1 and b2, enable us to distinguish the abrasion from fragmentation. This work provides an interesting characterization method to the understanding of granulates' attrition mechanism. |
| Databáze: | OpenAIRE |
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