Pub Date : 2020-02-29DOI: 10.2473/journalofmmij.136.8
K. Adachi, Y. Nakai, S. Mitsuno, M. Miyamoto, A. Kitada, Kazuhiro Fukami, K. Murase
The mechanism of nodulation in copper electrorefi ning process was investigated by experimental method and simulation, in particular as for its growth in height. Due to the high current density at the tip, the nodule height increased as an exponential function of the time for electrolysis. Therefore, the growth behavior of nodules was strongly affected by the size of the nucleus and the existence of the threshold size to lead an electrical short circuit was suggested. Since some nodules obtained in the industrial process included mold releasing agent carried from anode-casting process, mold releasing agents are considered to be one of the main causes of the large nodule and need to be removed for the improvement in the current effi ciency.
{"title":"The Mechanism of Nodular Growth in Copper Electrorefining","authors":"K. Adachi, Y. Nakai, S. Mitsuno, M. Miyamoto, A. Kitada, Kazuhiro Fukami, K. Murase","doi":"10.2473/journalofmmij.136.8","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.8","url":null,"abstract":"The mechanism of nodulation in copper electrorefi ning process was investigated by experimental method and simulation, in particular as for its growth in height. Due to the high current density at the tip, the nodule height increased as an exponential function of the time for electrolysis. Therefore, the growth behavior of nodules was strongly affected by the size of the nucleus and the existence of the threshold size to lead an electrical short circuit was suggested. Since some nodules obtained in the industrial process included mold releasing agent carried from anode-casting process, mold releasing agents are considered to be one of the main causes of the large nodule and need to be removed for the improvement in the current effi ciency.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75004318","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 : 2020-01-31DOI: 10.2473/journalofmmij.136.1
K. Hashiba, K. Fukui
{"title":"On The Time Dependence, Probability Distribution, and Size Effect of Rock Strength","authors":"K. Hashiba, K. Fukui","doi":"10.2473/journalofmmij.136.1","DOIUrl":"https://doi.org/10.2473/journalofmmij.136.1","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79025170","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 : 2019-12-31DOI: 10.2473/journalofmmij.135.109
M. Miyake, T. Ishii, Kei Yamagami, T. Hirato
{"title":"Selective Leaching of Gold from Copper Anode Slime Using Concentrated Hydrochloric Acid and Hydrogen Peroxide","authors":"M. Miyake, T. Ishii, Kei Yamagami, T. Hirato","doi":"10.2473/journalofmmij.135.109","DOIUrl":"https://doi.org/10.2473/journalofmmij.135.109","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"37 1","pages":"109-115"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73990549","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 : 2019-11-30DOI: 10.2473/journalofmmij.135.101
Hideki Nakata, Mika Yokoshima, Tasuma Suzuki, Masakazu Niinae
{"title":"Immobilization Process of Soil Contaminated with Selenium (VI) Using Magnesium Oxide and Iron (II) Compounds","authors":"Hideki Nakata, Mika Yokoshima, Tasuma Suzuki, Masakazu Niinae","doi":"10.2473/journalofmmij.135.101","DOIUrl":"https://doi.org/10.2473/journalofmmij.135.101","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83011811","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 : 2019-10-31DOI: 10.2473/journalofmmij.135.89
H. Sugiyama, Youqing Chen
･ 7Al 2 O 3 electride is one of the outstanding materials expected to be applied in various fields such as electronics and catalyst, and generally fabricated by sintering high purity CaCO 3 and Al 2 O 3 . We attempted to fabricate 12CaO ･ 7Al 2 O 3 electride using limestone as a raw material instead of using high purity CaCO 3 aiming at further industrial use, and investigated the gas adsorption properties of the fabricated samples. Three samples, two from limestone and one from high purity CaCO 3 , were prepared and exposed to the atmosphere for about 9 hours, and then the gas adsorption properties of them were analyzed by Py-GC/MS. As a result, desorption of N 2 and O 2 which are abundant in the atmosphere was not observed by heating the samples exposed to the atmosphere up to 700 ℃ , while desorption of CO and CH 4 was identifi ed. It is implied that the desorbed CO originates from CO 2 in the atmosphere. This result indicates these samples might selectively adsorb CO 2 and CH 4 as compared with N 2 and O 2 . Furthermore, for the limestone derived samples, the selectivity of CO 2 and CH 4 adsorption was improved and this result indicated the possibility that the CO 2 adsorption capacity of these samples is higher than that made from high purity CaCO 3 . One reason of this phenomena is inferred the changes in the electronic state of material surfaces due to the doping of impurities contained in limestones, such as Mg, Sr, and Cu, into the Ca sites of the cage-like structure in 12CaO ･ 7Al 2 O 3 electride.
{"title":"Gas Adsorption Properties of 12CaO・7Al2O3 Electride Derived from Limestone","authors":"H. Sugiyama, Youqing Chen","doi":"10.2473/journalofmmij.135.89","DOIUrl":"https://doi.org/10.2473/journalofmmij.135.89","url":null,"abstract":"･ 7Al 2 O 3 electride is one of the outstanding materials expected to be applied in various fields such as electronics and catalyst, and generally fabricated by sintering high purity CaCO 3 and Al 2 O 3 . We attempted to fabricate 12CaO ･ 7Al 2 O 3 electride using limestone as a raw material instead of using high purity CaCO 3 aiming at further industrial use, and investigated the gas adsorption properties of the fabricated samples. Three samples, two from limestone and one from high purity CaCO 3 , were prepared and exposed to the atmosphere for about 9 hours, and then the gas adsorption properties of them were analyzed by Py-GC/MS. As a result, desorption of N 2 and O 2 which are abundant in the atmosphere was not observed by heating the samples exposed to the atmosphere up to 700 ℃ , while desorption of CO and CH 4 was identifi ed. It is implied that the desorbed CO originates from CO 2 in the atmosphere. This result indicates these samples might selectively adsorb CO 2 and CH 4 as compared with N 2 and O 2 . Furthermore, for the limestone derived samples, the selectivity of CO 2 and CH 4 adsorption was improved and this result indicated the possibility that the CO 2 adsorption capacity of these samples is higher than that made from high purity CaCO 3 . One reason of this phenomena is inferred the changes in the electronic state of material surfaces due to the doping of impurities contained in limestones, such as Mg, Sr, and Cu, into the Ca sites of the cage-like structure in 12CaO ･ 7Al 2 O 3 electride.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83898790","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 : 2019-10-31DOI: 10.2473/journalofmmij.135.94
Yoshiaki Takahashi, Kotaro Yamaguchi, T. Sasaoka, A. Hamanaka, H. Shimada, M. Ichinose, S. Kubota, T. Saburi
{"title":"The Effect of Blasting Design and Rock Mass Conditions on Flight Behavior of Rock Fragmentation in Surface Mining","authors":"Yoshiaki Takahashi, Kotaro Yamaguchi, T. Sasaoka, A. Hamanaka, H. Shimada, M. Ichinose, S. Kubota, T. Saburi","doi":"10.2473/journalofmmij.135.94","DOIUrl":"https://doi.org/10.2473/journalofmmij.135.94","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75781538","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 : 2019-09-30DOI: 10.2473/journalofmmij.135.83
M. Takano, S. Asano, Shohei Nishihama, K. Yoshizuka
batteries for electronic devices such as laptop computers, as automotive batteries for electric vehicles or hybrid vehicles. Therefore, demand for lithium is rapidly increasing. However, in the recovery of lithium from a salt lake, brine containing many impurities such as sulfate and magnesium ions are not effectively utilized because solar evaporation cannot be used. We developed the λ -MnO 2 adsorbent in order to selectively recover lithium from such brine. In this study, we investigated the adsorption characteristics such as adsorption capacity, adsorption rate and selectivity of lithium by batch mixing and column test using simulated brine. The adsorbent prepared by hydrometallurgical process had higher adsorption capacity and rate of lithium than the adsorbent prepared by pyrometallurgical process.
{"title":"Development of λ-MnO2 Adsorbent for Lithium Recovery from Salt Lake Brine","authors":"M. Takano, S. Asano, Shohei Nishihama, K. Yoshizuka","doi":"10.2473/journalofmmij.135.83","DOIUrl":"https://doi.org/10.2473/journalofmmij.135.83","url":null,"abstract":"batteries for electronic devices such as laptop computers, as automotive batteries for electric vehicles or hybrid vehicles. Therefore, demand for lithium is rapidly increasing. However, in the recovery of lithium from a salt lake, brine containing many impurities such as sulfate and magnesium ions are not effectively utilized because solar evaporation cannot be used. We developed the λ -MnO 2 adsorbent in order to selectively recover lithium from such brine. In this study, we investigated the adsorption characteristics such as adsorption capacity, adsorption rate and selectivity of lithium by batch mixing and column test using simulated brine. The adsorbent prepared by hydrometallurgical process had higher adsorption capacity and rate of lithium than the adsorbent prepared by pyrometallurgical process.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"172 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74889672","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 : 2019-08-31DOI: 10.2473/journalofmmij.135.71
S. Natsui, Ryota Nashimoto, Kazui Tonya, Akinori Sawada, T. Kikuchi, R. Suzuki
{"title":"Numerical Analysis of Interfacial Morphology and Dispersion Behavior of High-Temperature Melts","authors":"S. Natsui, Ryota Nashimoto, Kazui Tonya, Akinori Sawada, T. Kikuchi, R. Suzuki","doi":"10.2473/journalofmmij.135.71","DOIUrl":"https://doi.org/10.2473/journalofmmij.135.71","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76183434","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 : 2019-07-31DOI: 10.2473/JOURNALOFMMIJ.135.63
Y. Hayashi, B. Guo, T. Hirajima, Tatsuya Ito, Takeshi Nakamura, K. Sasaki
Removal of borate in mine drainages by co-precipitation with hydroxyapatite (HAp) was developed from a laboratory scale to a pilot scale. Weakly acidic initial pH facilitated to enhance dissolution of Ca(OH) 2 and decrease the dissolved carbonate concentration, leading to efficient immobilization of borate and arsenate. The NH 4 H 2 PO 4 lowered best the equilibrium B concentration among different phosphate sources, avoiding the lattice strain of HAp. The added molar ratio of P/Ca significantly influenced the decreasing behavior of the B concentration, showing the optimal value of 0.3. In case of P/Ca larger than 0.30, the excess concentration of PO 43- was probably adsorbed on Ca(OH) 2 particles to prevent the dissolution, resulting in inhibiting the formation of HAp. In case of P/Ca smaller than 0.30, the production of HAp was limited, leading to less immobilized borate. All the optimized conditions as above were applied to the pilot scale with a 250 L reactor, where borate concentration was effectively reduced in also both batch and continuous tests.
{"title":"Application of Simultaneous Immobilization of Borate and Arsenate in Mine Drainages by Co-Precipitation with Hydroxyapatite in a Pilot Scale","authors":"Y. Hayashi, B. Guo, T. Hirajima, Tatsuya Ito, Takeshi Nakamura, K. Sasaki","doi":"10.2473/JOURNALOFMMIJ.135.63","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.135.63","url":null,"abstract":"Removal of borate in mine drainages by co-precipitation with hydroxyapatite (HAp) was developed from a laboratory scale to a pilot scale. Weakly acidic initial pH facilitated to enhance dissolution of Ca(OH) 2 and decrease the dissolved carbonate concentration, leading to efficient immobilization of borate and arsenate. The NH 4 H 2 PO 4 lowered best the equilibrium B concentration among different phosphate sources, avoiding the lattice strain of HAp. The added molar ratio of P/Ca significantly influenced the decreasing behavior of the B concentration, showing the optimal value of 0.3. In case of P/Ca larger than 0.30, the excess concentration of PO 43- was probably adsorbed on Ca(OH) 2 particles to prevent the dissolution, resulting in inhibiting the formation of HAp. In case of P/Ca smaller than 0.30, the production of HAp was limited, leading to less immobilized borate. All the optimized conditions as above were applied to the pilot scale with a 250 L reactor, where borate concentration was effectively reduced in also both batch and continuous tests.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73615250","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 : 2019-07-31DOI: 10.2473/JOURNALOFMMIJ.135.52
Y. Shimizu, N. Hatakeyama, Eigo Hanamura, Kazuo Watanabe, Y. Yokoyama, T. Masuyama
{"title":"Flow Characteristics of Slurry with Rare-Earth Rich Mud under Deep Seabed around Minamitorishima","authors":"Y. Shimizu, N. Hatakeyama, Eigo Hanamura, Kazuo Watanabe, Y. Yokoyama, T. Masuyama","doi":"10.2473/JOURNALOFMMIJ.135.52","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.135.52","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86618713","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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