Quantitative Evaluation of the Effect of High-Pressure Grinding Roll on the Promotion of the Mineral Liberation of Copper Ore
The high-pressure grinding roll (HPGR) has been known to achieve a high mineral liberation with relatively low energy consumption. However, quantitative methods for evaluating the effect of HPGR grinding on the promotion of the mineral liberation of copper ores have not been fully established. This...
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| Format: | Article |
| Language: | English |
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The Mining and Materials Processing Institute of Japan
2022-06-01
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| Series: | Journal of MMIJ |
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| Online Access: | https://www.jstage.jst.go.jp/article/journalofmmij/138/6/138_95/_pdf/-char/en |
| _version_ | 1797745812196818944 |
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| author | Yuki TSUNAZAWA Yoshihiro KOSAKU Yoshitaka SAKAIRI Koji TSUKADA Tamaki SAITO Yosuke EBISU Kohei MITSUHASHI Youqing CHEN Chiharu TOKORO |
| author_facet | Yuki TSUNAZAWA Yoshihiro KOSAKU Yoshitaka SAKAIRI Koji TSUKADA Tamaki SAITO Yosuke EBISU Kohei MITSUHASHI Youqing CHEN Chiharu TOKORO |
| author_sort | Yuki TSUNAZAWA |
| collection | DOAJ |
| description | The high-pressure grinding roll (HPGR) has been known to achieve a high mineral liberation with relatively low energy consumption. However, quantitative methods for evaluating the effect of HPGR grinding on the promotion of the mineral liberation of copper ores have not been fully established. This study aims to establish a quantitative evaluation of promoting the liberation ratio of copper minerals by HPGR grinding. We performed clack observation using the combination of the paint penetration method and the mineral liberation analyzer (MLA). Direct clack observation reveals that HPGR grinding can promote the formation of cracks in the product particles. The liberation ratio of copper minerals is related to the percentage of cracks in the product particles. Besides, the grinding tests using a laboratory ultra-small scale showed that the liberation ratio of copper minerals became larger than that of the ball milling alone. In all conditions where HPGR grinding was conducted before ball milling, the ball milling time became almost half that of the ball milling alone. The grinding kinetic constant of the HPGR milling product in ball milling is also determined. The grinding kinetic constants for 80% passing particle size in HPGR grinding products are larger than that in feed ores, and they are consistent with the trend of ball milling time. This might be because the HPGR milling causes cracks in the particles, which are more easily ground in the subsequent ball milling. Consequently, this study demonstrates that the ratio of clacks and the grinding kinetic constant in the ball milling process after HPGR milling can be used as an index to quantitatively evaluate the effect of HPGR milling on promoting the liberation of copper minerals. |
| first_indexed | 2024-03-12T15:29:17Z |
| format | Article |
| id | doaj.art-26254f09840847bd8753fbb63a932fdb |
| institution | Directory Open Access Journal |
| issn | 1881-6118 1884-0450 |
| language | English |
| last_indexed | 2024-03-12T15:29:17Z |
| publishDate | 2022-06-01 |
| publisher | The Mining and Materials Processing Institute of Japan |
| record_format | Article |
| series | Journal of MMIJ |
| spelling | doaj.art-26254f09840847bd8753fbb63a932fdb2023-08-10T09:07:16ZengThe Mining and Materials Processing Institute of JapanJournal of MMIJ1881-61181884-04502022-06-0113869510210.2473/journalofmmij.138.95journalofmmijQuantitative Evaluation of the Effect of High-Pressure Grinding Roll on the Promotion of the Mineral Liberation of Copper OreYuki TSUNAZAWA0Yoshihiro KOSAKU1Yoshitaka SAKAIRI2Koji TSUKADA3Tamaki SAITO4Yosuke EBISU5Kohei MITSUHASHI6Youqing CHEN7Chiharu TOKORO8Researcher, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)Master student, Graduate School of Creative Science and Engineering, Waseda UniversityResearcher , Technology Division, Furukawa Co., Ltd.Senior Mechanical Engineer, Design Department Industrial Machinery Section, Furukawa Industrial Machinery Systems Co., Ltd.Senior Metallurgist, Research & Development Department, Nittetsu Mining Co., Ltd.Senior Metallurgist, Research & Development Department, Nittetsu Mining Co., Ltd.Deputy General Manager, Research & Development Department, Nittetsu Mining Co., Ltd.Assistant Professor, Graduate School of Energy Science, Kyoto UniversityProfessor, Faculty of Science and Engineering, Waseda UniversityThe high-pressure grinding roll (HPGR) has been known to achieve a high mineral liberation with relatively low energy consumption. However, quantitative methods for evaluating the effect of HPGR grinding on the promotion of the mineral liberation of copper ores have not been fully established. This study aims to establish a quantitative evaluation of promoting the liberation ratio of copper minerals by HPGR grinding. We performed clack observation using the combination of the paint penetration method and the mineral liberation analyzer (MLA). Direct clack observation reveals that HPGR grinding can promote the formation of cracks in the product particles. The liberation ratio of copper minerals is related to the percentage of cracks in the product particles. Besides, the grinding tests using a laboratory ultra-small scale showed that the liberation ratio of copper minerals became larger than that of the ball milling alone. In all conditions where HPGR grinding was conducted before ball milling, the ball milling time became almost half that of the ball milling alone. The grinding kinetic constant of the HPGR milling product in ball milling is also determined. The grinding kinetic constants for 80% passing particle size in HPGR grinding products are larger than that in feed ores, and they are consistent with the trend of ball milling time. This might be because the HPGR milling causes cracks in the particles, which are more easily ground in the subsequent ball milling. Consequently, this study demonstrates that the ratio of clacks and the grinding kinetic constant in the ball milling process after HPGR milling can be used as an index to quantitatively evaluate the effect of HPGR milling on promoting the liberation of copper minerals.https://www.jstage.jst.go.jp/article/journalofmmij/138/6/138_95/_pdf/-char/encopper oreliberationclack observationhigh pressure grinding rollgrinding kinetic constant |
| spellingShingle | Yuki TSUNAZAWA Yoshihiro KOSAKU Yoshitaka SAKAIRI Koji TSUKADA Tamaki SAITO Yosuke EBISU Kohei MITSUHASHI Youqing CHEN Chiharu TOKORO Quantitative Evaluation of the Effect of High-Pressure Grinding Roll on the Promotion of the Mineral Liberation of Copper Ore Journal of MMIJ copper ore liberation clack observation high pressure grinding roll grinding kinetic constant |
| title | Quantitative Evaluation of the Effect of High-Pressure Grinding Roll on the Promotion of the Mineral Liberation of Copper Ore |
| title_full | Quantitative Evaluation of the Effect of High-Pressure Grinding Roll on the Promotion of the Mineral Liberation of Copper Ore |
| title_fullStr | Quantitative Evaluation of the Effect of High-Pressure Grinding Roll on the Promotion of the Mineral Liberation of Copper Ore |
| title_full_unstemmed | Quantitative Evaluation of the Effect of High-Pressure Grinding Roll on the Promotion of the Mineral Liberation of Copper Ore |
| title_short | Quantitative Evaluation of the Effect of High-Pressure Grinding Roll on the Promotion of the Mineral Liberation of Copper Ore |
| title_sort | quantitative evaluation of the effect of high pressure grinding roll on the promotion of the mineral liberation of copper ore |
| topic | copper ore liberation clack observation high pressure grinding roll grinding kinetic constant |
| url | https://www.jstage.jst.go.jp/article/journalofmmij/138/6/138_95/_pdf/-char/en |
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