Pub Date : 2021-01-31DOI: 10.2473/JOURNALOFMMIJ.137.1
Natsuo Okada, Yohei Maekawa, Narihiro Owada, Kazutoshi Haga, A. Shibayama, Y. Kawamura
Currently, there have been issues concerning the depletion and scarcity of mineral resources. This is mostly due to the excavation of high grade minerals having already occurred years and years ago, hence forcing the mining industry to opt for the production and optimization of lower grade minerals. This however brings about a plethora of problems, many of which economic, stemming from the purification of those low grade minerals in various stages required for mineral processing. In order to reduce costs and aid in the optimization of the mining stream, this study, introduces an automatic mineral identification system which combines the predictive abilities of deep learning with the excellent resolution of hyperspectral imaging, for pre-stage of mineral processing. These technologies were used to identify and classify high grade arsenic (As) bearing minerals from their low grade mineral counterparts non-destructively. Most of this ability to perform such tasks comes from the highly versatile machine learning model which employs deep learning as a means to classify minerals for mineral processing. Experimental results supported this statement as the model was able to achieve an over 90% accuracy in the prediction of As-bearing minerals, hence, one could conclude that this system has the potential to be employed in the mining industry as it achieves modern day system requirements such as high accuracy, speed, economic, user-friendly and automatic mineral identification.
{"title":"Classification of Arsenic Bearing Minerals Using Hyperspectral Imaging and Deep Learning for Mineral Processing","authors":"Natsuo Okada, Yohei Maekawa, Narihiro Owada, Kazutoshi Haga, A. Shibayama, Y. Kawamura","doi":"10.2473/JOURNALOFMMIJ.137.1","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.137.1","url":null,"abstract":"Currently, there have been issues concerning the depletion and scarcity of mineral resources. This is mostly due to the excavation of high grade minerals having already occurred years and years ago, hence forcing the mining industry to opt for the production and optimization of lower grade minerals. This however brings about a plethora of problems, many of which economic, stemming from the purification of those low grade minerals in various stages required for mineral processing. In order to reduce costs and aid in the optimization of the mining stream, this study, introduces an automatic mineral identification system which combines the predictive abilities of deep learning with the excellent resolution of hyperspectral imaging, for pre-stage of mineral processing. These technologies were used to identify and classify high grade arsenic (As) bearing minerals from their low grade mineral counterparts non-destructively. Most of this ability to perform such tasks comes from the highly versatile machine learning model which employs deep learning as a means to classify minerals for mineral processing. Experimental results supported this statement as the model was able to achieve an over 90% accuracy in the prediction of As-bearing minerals, hence, one could conclude that this system has the potential to be employed in the mining industry as it achieves modern day system requirements such as high accuracy, speed, economic, user-friendly and automatic mineral identification.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85717182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-31DOI: 10.2473/JOURNALOFMMIJ.137.17
Q. Sun, K. Sasaki, Y. Sugai, R. Nguele
{"title":"Prediction of Pressure Response at A Monitoring well in Initial Injection Stages of CO2 Geological Storage into A Deep Aquifers","authors":"Q. Sun, K. Sasaki, Y. Sugai, R. Nguele","doi":"10.2473/JOURNALOFMMIJ.137.17","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.137.17","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"86 1","pages":"17-23"},"PeriodicalIF":0.0,"publicationDate":"2021-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73107010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-31DOI: 10.2473/JOURNALOFMMIJ.137.10
Kazuhiro Kumamoto, Kunitomo Yoshinobu, A. Kishimoto, K. Okamoto, Akiko Kuramitsu, T. Uda
A new Ti smelting process via . Bi–Ti alloy is proposed. This process comprises reduction of TiCl 4 to Bi–10 mol%Ti alloy by Bi–Mg alloy, precipitation of Ti-rich compound from the alloy, and vacuum distillation. In this study, we investigated the precipitation and distillation processes. In the precipitation process, the Bi–10 mol%Ti liquid alloy is cooled from 900 ℃ to 500 ℃ to precipitate Bi 9 Ti 8 in the liquid alloy. The Bi 9 Ti 8 is recovered by a two-step separation method: recovery of mixture of Bi 9 Ti 8 and Bi and further removal of Bi by centrifugal filtration. We demonstrated the recovery of mixture. As the results, Ti concentration in the mixture was 31 mol%, and the Ti yield was about 45 %. Because the remained liquid alloy after the recovery contains a large amount of Bi 9 Ti 8 , it is required to reuse the remained alloy in the precipitation process. Assuming the reuse of remained alloy, the material flow of the process was designed based on the experimental results. The centrifugal filtration of the mixture of Bi 9 Ti 8 and Bi was also carried out at 500 ℃ . By the centrifugal filtration at 50 G, alloys with a size of 1.5 mm were obtained, and the Ti concentration in the alloys was increased from 31 mol% to 40 mol%. Vacuum distillation of alloy powder and ingot was demonstrated. The distillation rate was enhanced when using the powder than when using alloy ingot as a starting material.
{"title":"Separation of Ti from Bi-Ti alloy by Solid-Liquid Separation at High Temperature and Vacuum Distillation","authors":"Kazuhiro Kumamoto, Kunitomo Yoshinobu, A. Kishimoto, K. Okamoto, Akiko Kuramitsu, T. Uda","doi":"10.2473/JOURNALOFMMIJ.137.10","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.137.10","url":null,"abstract":"A new Ti smelting process via . Bi–Ti alloy is proposed. This process comprises reduction of TiCl 4 to Bi–10 mol%Ti alloy by Bi–Mg alloy, precipitation of Ti-rich compound from the alloy, and vacuum distillation. In this study, we investigated the precipitation and distillation processes. In the precipitation process, the Bi–10 mol%Ti liquid alloy is cooled from 900 ℃ to 500 ℃ to precipitate Bi 9 Ti 8 in the liquid alloy. The Bi 9 Ti 8 is recovered by a two-step separation method: recovery of mixture of Bi 9 Ti 8 and Bi and further removal of Bi by centrifugal filtration. We demonstrated the recovery of mixture. As the results, Ti concentration in the mixture was 31 mol%, and the Ti yield was about 45 %. Because the remained liquid alloy after the recovery contains a large amount of Bi 9 Ti 8 , it is required to reuse the remained alloy in the precipitation process. Assuming the reuse of remained alloy, the material flow of the process was designed based on the experimental results. The centrifugal filtration of the mixture of Bi 9 Ti 8 and Bi was also carried out at 500 ℃ . By the centrifugal filtration at 50 G, alloys with a size of 1.5 mm were obtained, and the Ti concentration in the alloys was increased from 31 mol% to 40 mol%. Vacuum distillation of alloy powder and ingot was demonstrated. The distillation rate was enhanced when using the powder than when using alloy ingot as a starting material.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77209122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.2473/journalofmmij.137.45
Hidehiro Sekimoto, T. Kubo, K. Yamaguchi,
{"title":"Retraction：Development of a New Recycling Process for Neodymium Permanent Magnet Using B2O3 Flux","authors":"Hidehiro Sekimoto, T. Kubo, K. Yamaguchi,","doi":"10.2473/journalofmmij.137.45","DOIUrl":"https://doi.org/10.2473/journalofmmij.137.45","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90193339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-31DOI: 10.2473/journalofmmij.136.159
Shokichi Sakata
{"title":"The Effects of CSR in Resource-rich, Developing Countries","authors":"Shokichi Sakata","doi":"10.2473/journalofmmij.136.159","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.159","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81168169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-31DOI: 10.2473/journalofmmij.136.140
Y. Kano, T. Ishido, S. Nakao
{"title":"Effects of Heterogeneous Seal Layer Property on The Long-Term Behaviour of CO2 Injected into Deep Multilayer Systems","authors":"Y. Kano, T. Ishido, S. Nakao","doi":"10.2473/journalofmmij.136.140","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.140","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"9 1","pages":"140-150"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90391018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-30DOI: 10.2473/journalofmmij.136.134
T. Takehara, Y. Oikawa, T. Fujii, K. Miyazaki
{"title":"Changes of Coal Strength under Hydrostatic Pressure Caused by CO2 and N2 Injection","authors":"T. Takehara, Y. Oikawa, T. Fujii, K. Miyazaki","doi":"10.2473/journalofmmij.136.134","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.134","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"17 1","pages":"134-139"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90318725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-30DOI: 10.2473/journalofmmij.136.127
Atsuko Tanaka
{"title":"Social Acceptance of CCS","authors":"Atsuko Tanaka","doi":"10.2473/journalofmmij.136.127","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.127","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"73 1","pages":"127-133"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80437796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.2473/journalofmmij.136.110
Y. Oikawa, T. Takehara, X. Lei, H. Fukazawa, Tsutomu Yamaguchi
Elucidating the sealing capacity of caprock is very important because CO 2 sequestered in deep aquifers can remain there for several hundred years in the CO 2 sequestration. Threshold capillary pressure is a key property affecting sealing capacity, and therefore, the ability to measure the threshold pressure of a target rock conveniently is highly sought after. In this study, data collected during the CO 2 injection process in triaxial compression tests of mudstone supposed to be a caprock were used to measure threshold pressure via the dynamic method. These triaxial tests were conducted to study the mechanical properties of mudstone below depths of 1000 m. The threshold pressure for 23 out of 26 test samples was successfully measured. Measured values ranged from 0.54 to 1.57 MPa, which was within a reasonable range compared to the results reported by three other studies that used similar mudstone specimens. A small amount of shrinkage induced by a pore pressure decrease, which was caused by a threshold pressure, was observed in the experiment. The threshold pressure showed a positive correlation with the shrinkage, implying that this pressure might be estimated from the shrinkage. Thus, a volumetric elastic constant was calculated from the shrinkage assuming that the decrease in mean pore pressure was half of the threshold pressure. The mean volumetric elastic constant was 0.92 GPa, which was about 40% lower than that of the rocks from which the test samples were obtained. These results indicate that the shrinkage value cannot be directly used to estimate the threshold pressure, and that a correction of this shrinkage value is necessary.
{"title":"Measurement of Threshold Capillary Pressure Using Data of CO2 Injection under Triaxial Compression Test on Mudstone","authors":"Y. Oikawa, T. Takehara, X. Lei, H. Fukazawa, Tsutomu Yamaguchi","doi":"10.2473/journalofmmij.136.110","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.110","url":null,"abstract":"Elucidating the sealing capacity of caprock is very important because CO 2 sequestered in deep aquifers can remain there for several hundred years in the CO 2 sequestration. Threshold capillary pressure is a key property affecting sealing capacity, and therefore, the ability to measure the threshold pressure of a target rock conveniently is highly sought after. In this study, data collected during the CO 2 injection process in triaxial compression tests of mudstone supposed to be a caprock were used to measure threshold pressure via the dynamic method. These triaxial tests were conducted to study the mechanical properties of mudstone below depths of 1000 m. The threshold pressure for 23 out of 26 test samples was successfully measured. Measured values ranged from 0.54 to 1.57 MPa, which was within a reasonable range compared to the results reported by three other studies that used similar mudstone specimens. A small amount of shrinkage induced by a pore pressure decrease, which was caused by a threshold pressure, was observed in the experiment. The threshold pressure showed a positive correlation with the shrinkage, implying that this pressure might be estimated from the shrinkage. Thus, a volumetric elastic constant was calculated from the shrinkage assuming that the decrease in mean pore pressure was half of the threshold pressure. The mean volumetric elastic constant was 0.92 GPa, which was about 40% lower than that of the rocks from which the test samples were obtained. These results indicate that the shrinkage value cannot be directly used to estimate the threshold pressure, and that a correction of this shrinkage value is necessary.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90353506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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