Milling Studies in an Impact Crusher I: Kinetics Modelling Based on Population Balance Modelling
A number of experiments were conducted on a laboratory batch impact crusher to investigate the effects of particle size and impeller speed on grinding rate and product size distribution. The experiments involved feeding a fixed mass of particles through a funnel into the crusher up to four times, an...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/5/470 |
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| author | Ngonidzashe Chimwani Murray M. Bwalya |
| author_facet | Ngonidzashe Chimwani Murray M. Bwalya |
| author_sort | Ngonidzashe Chimwani |
| collection | DOAJ |
| description | A number of experiments were conducted on a laboratory batch impact crusher to investigate the effects of particle size and impeller speed on grinding rate and product size distribution. The experiments involved feeding a fixed mass of particles through a funnel into the crusher up to four times, and monitoring the grinding achieved with each pass. The duration of each pass was approximately 20 s; thus, this amounted to a total time of 1 min and 20 s of grinding for four passes. The population balance model (PBM) was then used to describe the breakage process, and its effectiveness as a tool for describing the breakage process in the vertical impact crusher is assessed. It was observed that low impeller speeds require longer crushing time to break the particles significantly whilst for higher speeds, longer crushing time is not desirable as grinding rate sharply decreases as the crushing time increases, hence the process becomes inefficient. Results also showed that larger particle sizes require shorter breakage time whilst smaller feed particles require longer breakage time. |
| first_indexed | 2024-03-10T11:47:50Z |
| format | Article |
| id | doaj.art-0c3016147f964357a69c40d4f4faf477 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T11:47:50Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-0c3016147f964357a69c40d4f4faf4772023-11-21T17:53:12ZengMDPI AGMinerals2075-163X2021-04-0111547010.3390/min11050470Milling Studies in an Impact Crusher I: Kinetics Modelling Based on Population Balance ModellingNgonidzashe Chimwani0Murray M. Bwalya1Institute of the Development of Energy for African Sustainability (IDEAS), Florida Campus, University of South Africa (UNISA), Private Bag X6, Johannesburg 1710, South AfricaSchool of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg 2050, South AfricaA number of experiments were conducted on a laboratory batch impact crusher to investigate the effects of particle size and impeller speed on grinding rate and product size distribution. The experiments involved feeding a fixed mass of particles through a funnel into the crusher up to four times, and monitoring the grinding achieved with each pass. The duration of each pass was approximately 20 s; thus, this amounted to a total time of 1 min and 20 s of grinding for four passes. The population balance model (PBM) was then used to describe the breakage process, and its effectiveness as a tool for describing the breakage process in the vertical impact crusher is assessed. It was observed that low impeller speeds require longer crushing time to break the particles significantly whilst for higher speeds, longer crushing time is not desirable as grinding rate sharply decreases as the crushing time increases, hence the process becomes inefficient. Results also showed that larger particle sizes require shorter breakage time whilst smaller feed particles require longer breakage time.https://www.mdpi.com/2075-163X/11/5/470impact crushercomminutionmilling parameterspopulation balance mode |
| spellingShingle | Ngonidzashe Chimwani Murray M. Bwalya Milling Studies in an Impact Crusher I: Kinetics Modelling Based on Population Balance Modelling Minerals impact crusher comminution milling parameters population balance mode |
| title | Milling Studies in an Impact Crusher I: Kinetics Modelling Based on Population Balance Modelling |
| title_full | Milling Studies in an Impact Crusher I: Kinetics Modelling Based on Population Balance Modelling |
| title_fullStr | Milling Studies in an Impact Crusher I: Kinetics Modelling Based on Population Balance Modelling |
| title_full_unstemmed | Milling Studies in an Impact Crusher I: Kinetics Modelling Based on Population Balance Modelling |
| title_short | Milling Studies in an Impact Crusher I: Kinetics Modelling Based on Population Balance Modelling |
| title_sort | milling studies in an impact crusher i kinetics modelling based on population balance modelling |
| topic | impact crusher comminution milling parameters population balance mode |
| url | https://www.mdpi.com/2075-163X/11/5/470 |
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