Experimental and numerical investigation of particle size and particle strength reduction in high pressure grinding rolls
Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions....
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Zhang, Chengwei [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2022transfer abstract |
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| Übergeordnetes Werk: |
Enthalten in: Role of sulfur in combating arsenic stress through upregulation of important proteins, and - Amna, Syeda ELSEVIER, 2020, an international journal on the science and technology of wet and dry particulate systems, Amsterdam [u.a.] |
|---|---|
| Übergeordnetes Werk: |
volume:410 ; year:2022 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1016/j.powtec.2022.117892 |
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ELV058954805 |
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| 520 | |a Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. | ||
| 520 | |a Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. | ||
| 700 | 1 | |a Zou, Yudong |4 oth | |
| 700 | 1 | |a Gou, Dazhao |4 oth | |
| 700 | 1 | |a Yu, Aibing |4 oth | |
| 700 | 1 | |a Yang, Runyu |4 oth | |
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10.1016/j.powtec.2022.117892 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001903.pica (DE-627)ELV058954805 (ELSEVIER)S0032-5910(22)00773-2 DE-627 ger DE-627 rakwb eng 630 640 580 VZ BIODIV DE-30 fid 42.00 bkl Zhang, Chengwei verfasserin aut Experimental and numerical investigation of particle size and particle strength reduction in high pressure grinding rolls 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Zou, Yudong oth Gou, Dazhao oth Yu, Aibing oth Yang, Runyu oth Enthalten in Elsevier Science Amna, Syeda ELSEVIER Role of sulfur in combating arsenic stress through upregulation of important proteins, and 2020 an international journal on the science and technology of wet and dry particulate systems Amsterdam [u.a.] (DE-627)ELV005093252 volume:410 year:2022 pages:0 https://doi.org/10.1016/j.powtec.2022.117892 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV 42.00 Biologie: Allgemeines VZ AR 410 2022 0 |
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10.1016/j.powtec.2022.117892 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001903.pica (DE-627)ELV058954805 (ELSEVIER)S0032-5910(22)00773-2 DE-627 ger DE-627 rakwb eng 630 640 580 VZ BIODIV DE-30 fid 42.00 bkl Zhang, Chengwei verfasserin aut Experimental and numerical investigation of particle size and particle strength reduction in high pressure grinding rolls 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Zou, Yudong oth Gou, Dazhao oth Yu, Aibing oth Yang, Runyu oth Enthalten in Elsevier Science Amna, Syeda ELSEVIER Role of sulfur in combating arsenic stress through upregulation of important proteins, and 2020 an international journal on the science and technology of wet and dry particulate systems Amsterdam [u.a.] (DE-627)ELV005093252 volume:410 year:2022 pages:0 https://doi.org/10.1016/j.powtec.2022.117892 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV 42.00 Biologie: Allgemeines VZ AR 410 2022 0 |
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10.1016/j.powtec.2022.117892 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001903.pica (DE-627)ELV058954805 (ELSEVIER)S0032-5910(22)00773-2 DE-627 ger DE-627 rakwb eng 630 640 580 VZ BIODIV DE-30 fid 42.00 bkl Zhang, Chengwei verfasserin aut Experimental and numerical investigation of particle size and particle strength reduction in high pressure grinding rolls 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Zou, Yudong oth Gou, Dazhao oth Yu, Aibing oth Yang, Runyu oth Enthalten in Elsevier Science Amna, Syeda ELSEVIER Role of sulfur in combating arsenic stress through upregulation of important proteins, and 2020 an international journal on the science and technology of wet and dry particulate systems Amsterdam [u.a.] (DE-627)ELV005093252 volume:410 year:2022 pages:0 https://doi.org/10.1016/j.powtec.2022.117892 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV 42.00 Biologie: Allgemeines VZ AR 410 2022 0 |
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10.1016/j.powtec.2022.117892 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001903.pica (DE-627)ELV058954805 (ELSEVIER)S0032-5910(22)00773-2 DE-627 ger DE-627 rakwb eng 630 640 580 VZ BIODIV DE-30 fid 42.00 bkl Zhang, Chengwei verfasserin aut Experimental and numerical investigation of particle size and particle strength reduction in high pressure grinding rolls 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Zou, Yudong oth Gou, Dazhao oth Yu, Aibing oth Yang, Runyu oth Enthalten in Elsevier Science Amna, Syeda ELSEVIER Role of sulfur in combating arsenic stress through upregulation of important proteins, and 2020 an international journal on the science and technology of wet and dry particulate systems Amsterdam [u.a.] (DE-627)ELV005093252 volume:410 year:2022 pages:0 https://doi.org/10.1016/j.powtec.2022.117892 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV 42.00 Biologie: Allgemeines VZ AR 410 2022 0 |
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10.1016/j.powtec.2022.117892 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001903.pica (DE-627)ELV058954805 (ELSEVIER)S0032-5910(22)00773-2 DE-627 ger DE-627 rakwb eng 630 640 580 VZ BIODIV DE-30 fid 42.00 bkl Zhang, Chengwei verfasserin aut Experimental and numerical investigation of particle size and particle strength reduction in high pressure grinding rolls 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. Zou, Yudong oth Gou, Dazhao oth Yu, Aibing oth Yang, Runyu oth Enthalten in Elsevier Science Amna, Syeda ELSEVIER Role of sulfur in combating arsenic stress through upregulation of important proteins, and 2020 an international journal on the science and technology of wet and dry particulate systems Amsterdam [u.a.] (DE-627)ELV005093252 volume:410 year:2022 pages:0 https://doi.org/10.1016/j.powtec.2022.117892 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV 42.00 Biologie: Allgemeines VZ AR 410 2022 0 |
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Experimental and numerical investigation of particle size and particle strength reduction in high pressure grinding rolls |
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Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. |
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Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. |
| abstract_unstemmed |
Feed particles experience significant reduction in size and particle strength in high pressure grinding rolls (HPGR) due to strong compression. This paper presents a combined experimental and numerical study of the mechanics of cement particle breakage in a lab-scale HPGR under different conditions. A model based on the discrete element method (DEM) was developed and coupled with a multi-physics model and a particle breakage model to mimic the dynamics of particles in the HPGR. Through careful calibration of the model parameters, the model was able to generate results in good agreements with the experiments in terms of throughput, power consumption, product size distribution and mill productivity. The strength of the product particles, which was characterised by particle fracture energy, was analysed in the simulations and results showed much weaker and broader fracture energy distributions compared with the feed particles. Increasing roll speed increased throughput and power consumption but had little effect on working gap, product size and particle fracture energy. Higher roll speeds also significantly increased the pressure on the floating roll (but not on the fixed roll), which may result in more severe wear on the roll. Increasing pressure in general reduced throughput due to smaller working gaps and finer and weaker product particles. Furthermore, the over-sized (larger than 0.045 mm) product particles were fed into the mill to investigate the effect of multiple grinding. The particles passing through the 2nd grinding were much smaller and weaker, and the simulation results were comparable to the experiments. The study demonstrated that both particle size and particle strength need to be considered properly in DEM models to provide accurate prediction on the performance of HPGR under various condition. |
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