Pub Date : 2020-10-31DOI: 10.2473/journalofmmij.136.117
M. Kondo, Noriyoshi Ozawa, Kota Fujimaki, T. Igarashi
{"title":"Water Quality Survey and Its Application to Rock Slope Management at the Une Mine","authors":"M. Kondo, Noriyoshi Ozawa, Kota Fujimaki, T. Igarashi","doi":"10.2473/journalofmmij.136.117","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.117","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"91 1","pages":"117-126"},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82384998","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 : 2020-09-30DOI: 10.2473/JOURNALOFMMIJ.136.99
K. Sasaki, Hemeng Zhang, Salmawati, Yongjun Wang, Chea Samneang, R. Nguele, Y. Sugai, Xiaoming Zhang
There is a critical situation that a huge amount of greenhouse gases is emitted into the atmosphere from natural coal fires in underground coal seams and spontaneous combustions in coal piles in the world. To reduce the emissions of combustion gases, such as CO2, CH4, etc., some technical challenges and researches are required related to CO2 flux measurements, developing an effective chemical water-solution extinguishes coal fires and inhibits spontaneous combustion, constructing a numerical simulation model to treat the aging effect in coal heating rate. In this article, firstly, the previous studies were reviewed to explain measurement results of CO2 emission from coal fire/spontaneous combustion fields and the aging model used to simulate coal heating rate. Secondary, a trial development of some chemical solutions has been introduced to inhibit microscopic and macroscopic coal oxidations by forming a gel. Especially, sodium meta silicate solution showed a relatively good performance shifting the critical self-ignition temperature (CSIT) of a low rank coal to be 4 to 5℃ higher than that of water by forming gel with CO2 gases in the air and combustion gases emitted from coals. The brooking effect in macro scale by forming gel is also expected to extinguish coal seam fires by reducing aperture width in fractures connecting to the atmosphere. A numerical simulation using ANSI FLUENT has showed an extinguishing fire process of an underground coal seam including a horizontal fracture that is connected inlet and outlet fractures being air paths for air and combustion gas, respectively. Finally, the the research challenges required for technical developments have been proposed to carry a project extinguishing the coal seam fires and spontaneous combustions of coal piles with reducing CO2 emissions.
{"title":"A Research Approache for Reducing Natural CO2 Emissions by Extinguishing A Large Scale of Coal Fires and Spontaneous Combustions","authors":"K. Sasaki, Hemeng Zhang, Salmawati, Yongjun Wang, Chea Samneang, R. Nguele, Y. Sugai, Xiaoming Zhang","doi":"10.2473/JOURNALOFMMIJ.136.99","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.136.99","url":null,"abstract":"There is a critical situation that a huge amount of greenhouse gases is emitted into the atmosphere from natural coal fires in underground coal seams and spontaneous combustions in coal piles in the world. To reduce the emissions of combustion gases, such as CO2, CH4, etc., some technical challenges and researches are required related to CO2 flux measurements, developing an effective chemical water-solution extinguishes coal fires and inhibits spontaneous combustion, constructing a numerical simulation model to treat the aging effect in coal heating rate. In this article, firstly, the previous studies were reviewed to explain measurement results of CO2 emission from coal fire/spontaneous combustion fields and the aging model used to simulate coal heating rate. Secondary, a trial development of some chemical solutions has been introduced to inhibit microscopic and macroscopic coal oxidations by forming a gel. Especially, sodium meta silicate solution showed a relatively good performance shifting the critical self-ignition temperature (CSIT) of a low rank coal to be 4 to 5℃ higher than that of water by forming gel with CO2 gases in the air and combustion gases emitted from coals. The brooking effect in macro scale by forming gel is also expected to extinguish coal seam fires by reducing aperture width in fractures connecting to the atmosphere. A numerical simulation using ANSI FLUENT has showed an extinguishing fire process of an underground coal seam including a horizontal fracture that is connected inlet and outlet fractures being air paths for air and combustion gas, respectively. Finally, the the research challenges required for technical developments have been proposed to carry a project extinguishing the coal seam fires and spontaneous combustions of coal piles with reducing CO2 emissions.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"34 1","pages":"99-109"},"PeriodicalIF":0.0,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80797615","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 : 2020-08-31DOI: 10.2473/journalofmmij.136.88
Y. Yasuda, H. Chida, T. Motomura
{"title":"Flash Smelting Furnace Renewal and Productivity Improvement in the Saganoseki Smelter and Refinery","authors":"Y. Yasuda, H. Chida, T. Motomura","doi":"10.2473/journalofmmij.136.88","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.88","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"1 1","pages":"88-98"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83674222","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 : 2020-07-31DOI: 10.2473/journalofmmij.136.77
H. Sasaki, T. Okabe
of copper when the copper anode contains a high concentration of impurities. When the amount of secondary materials (scraps) used is increased, the process of electrorefining is frequently troubled because e-waste contains elements that induce anode passivation. Therefore, the development of passivation-prevention technology for low-grade copper anode is essential. This article reviews previous research on the behavior of impurities in the Cu anode and their effects on passivation. The guiding principles for developing passivation-prevention technology are also outlined.
{"title":"Challenges for development of technology for prevention of anode passivation during electrorefining of low-grade copper","authors":"H. Sasaki, T. Okabe","doi":"10.2473/journalofmmij.136.77","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.77","url":null,"abstract":"of copper when the copper anode contains a high concentration of impurities. When the amount of secondary materials (scraps) used is increased, the process of electrorefining is frequently troubled because e-waste contains elements that induce anode passivation. Therefore, the development of passivation-prevention technology for low-grade copper anode is essential. This article reviews previous research on the behavior of impurities in the Cu anode and their effects on passivation. The guiding principles for developing passivation-prevention technology are also outlined.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"137 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77476782","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 : 2020-06-30DOI: 10.2473/journalofmmij.136.64
Takahiko Arima, R. Sasaki, C. Tabelin, Shuichi Tamoto, Takahiro Yamamoto, Tangviroon Pawit, T. Igarashi
{"title":"Leaching and Adsorption Behavior of Arsenic and Selenium from Excavated Mudstones Considering Their Chemical Species","authors":"Takahiko Arima, R. Sasaki, C. Tabelin, Shuichi Tamoto, Takahiro Yamamoto, Tangviroon Pawit, T. Igarashi","doi":"10.2473/journalofmmij.136.64","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.64","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"93 1","pages":"64-76"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80243455","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 : 2020-06-30DOI: 10.2473/journalofmmij.136.52
Y. Okamoto, M. Kawahata, Tomoyuki Shoudai, Kouhei Tsujimoto
{"title":"Introduction of Rock Cutting Machine “2500SM” into Limestone Mining Site and Its Effect","authors":"Y. Okamoto, M. Kawahata, Tomoyuki Shoudai, Kouhei Tsujimoto","doi":"10.2473/journalofmmij.136.52","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.52","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"18 1","pages":"52-63"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77999938","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 : 2020-05-31DOI: 10.2473/journalofmmij.136.40
N. Hatakeyama, Y. Shimizu, T. Masuyama
{"title":"Flow Analysis and Approximate Expressions of Factors Related to Frictional Loss for Laminar Flow of Viscoplastic Fluids through a Concentric Annulus","authors":"N. Hatakeyama, Y. Shimizu, T. Masuyama","doi":"10.2473/journalofmmij.136.40","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.40","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78716964","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 : 2020-05-31DOI: 10.2473/journalofmmij.136.33
Yutaka Ito, Masato Takeuchi, Shuto Mikami, Y. Kawamura
{"title":"Development and Validation of Virtual Reality Application in Mining Education","authors":"Yutaka Ito, Masato Takeuchi, Shuto Mikami, Y. Kawamura","doi":"10.2473/journalofmmij.136.33","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.33","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"22 1","pages":"33-39"},"PeriodicalIF":0.0,"publicationDate":"2020-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76477077","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 : 2020-04-30DOI: 10.2473/journalofmmij.136.25
H. Inano, Keiichi Tomita, Tatsumi Tada, N. Hiroyoshi
Reduction melting methods to remove Pb from lead silicate glasses such as cathode ray tube funnel glass have been extensively studied. In this paper, reduction melting of a model lead glass was conducted using printed circuit board as reductant. Model lead silicate glass, viscosity reducing agent (Na 2 CO 3 ), and printed circuit board were mixed and melted at 1473 K. Metal phase mainly composed of Pb was formed and settled in the melting glass residue. With increasing printed circuit board addition, the amount of metal phase increased and the concentrations of PbO remained in the glass residue decreased, indicating that addition of printed circuit board is effective to remove Pb from the Pb glass. By EDS analysis, it was confirmed that Cu, Ni and Sn are contained in the metal phase, indicating that metals in printed circuit board are recovered with Pb.
{"title":"Metal Recovery and Pb Removal by Melting Mixture of Lead Glass and Printed Circuit Board","authors":"H. Inano, Keiichi Tomita, Tatsumi Tada, N. Hiroyoshi","doi":"10.2473/journalofmmij.136.25","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.25","url":null,"abstract":"Reduction melting methods to remove Pb from lead silicate glasses such as cathode ray tube funnel glass have been extensively studied. In this paper, reduction melting of a model lead glass was conducted using printed circuit board as reductant. Model lead silicate glass, viscosity reducing agent (Na 2 CO 3 ), and printed circuit board were mixed and melted at 1473 K. Metal phase mainly composed of Pb was formed and settled in the melting glass residue. With increasing printed circuit board addition, the amount of metal phase increased and the concentrations of PbO remained in the glass residue decreased, indicating that addition of printed circuit board is effective to remove Pb from the Pb glass. By EDS analysis, it was confirmed that Cu, Ni and Sn are contained in the metal phase, indicating that metals in printed circuit board are recovered with Pb.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75278085","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 : 2020-03-31DOI: 10.2473/journalofmmij.136.14
H. Sasaki, Y. Ninomiya, T. Okabe
{"title":"Electrorefining of copper and anode passivation","authors":"H. Sasaki, Y. Ninomiya, T. Okabe","doi":"10.2473/journalofmmij.136.14","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.14","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"491 1","pages":"14-24"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76385192","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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