Pub Date : 1998-07-01DOI: 10.2473/SHIGENTOSOZAI.113.1082
N. Sato, Yuezhou Wei, M. Nanjo, M. Tokuda
Recovery of Samarium and Neodymium from rare earth magnet scraps which contain-30% of Sm or Nd and 50-60% of Co or Fe was examined by the fractional crystallization of their sulfates. The results are summarized as follows: 1) When H2SO4was added into the nitric acid solution containing Sm and Co, the solubility of Sm decreased and Sm sulfate hydrate preferentially crystallized. 2) Samarium sulfate hydrate of 96.5% purity with recovery rate 87.1% was obtained from Sm Co5magnet scrap by the fractional crystallization. Effective results were also obtained when Sm2 (Co, Fe, Cu, Zr) 17 was examined similarly. 3) The addition of ethanol into the sulfuric acid-nitric acid solution containing Nd and Fe was proved to be effective for the decrease of solubility and fractional crystallization of Nd. 4) Neodymium sulfate hydrate of 96.8% purity with recovery rate 97.1% was obtained from Nd-Fe-B magnet scrap by the fractional crystallization of metal sulfates with addition of ethanol as well as H2S04.
{"title":"Recycling. Fundamental study on the recycling of rare earth magnet. (2nd Report). Recovery of Samarium and Neodymium from Rare Earth Magnet Scraps by Fractional Crystallization Method.","authors":"N. Sato, Yuezhou Wei, M. Nanjo, M. Tokuda","doi":"10.2473/SHIGENTOSOZAI.113.1082","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.1082","url":null,"abstract":"Recovery of Samarium and Neodymium from rare earth magnet scraps which contain-30% of Sm or Nd and 50-60% of Co or Fe was examined by the fractional crystallization of their sulfates. The results are summarized as follows: 1) When H2SO4was added into the nitric acid solution containing Sm and Co, the solubility of Sm decreased and Sm sulfate hydrate preferentially crystallized. 2) Samarium sulfate hydrate of 96.5% purity with recovery rate 87.1% was obtained from Sm Co5magnet scrap by the fractional crystallization. Effective results were also obtained when Sm2 (Co, Fe, Cu, Zr) 17 was examined similarly. 3) The addition of ethanol into the sulfuric acid-nitric acid solution containing Nd and Fe was proved to be effective for the decrease of solubility and fractional crystallization of Nd. 4) Neodymium sulfate hydrate of 96.8% purity with recovery rate 97.1% was obtained from Nd-Fe-B magnet scrap by the fractional crystallization of metal sulfates with addition of ethanol as well as H2S04.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"12 1","pages":"1082-1086"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91209961","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 : 1997-12-25DOI: 10.2473/SHIGENTOSOZAI.113.1101
徹也 長坂, 光兀 日野
The recycling of valuable resources has currently became a major worldwide subject in the industries from the viewpoint of saving energy and protection of environment. Since the accumulated amount of steel product is reaching almost one billion ton in Japan, it is very important to develop the technology for the removal of tramp-elements such as tin, copper and zinc from steel scrap. In the present work, the rate of tin removal by the evaporation from carbon saturated liquid Fe-Sn-S alloy has been studied at 1, 673 K under reduced pressure.Tin evaporates from molten iron and equimolar amount of sulfur is also removed together with tin. The evaporation rate of tin increases with increasing initial sulfur content in the melt. It is confirmed that tin dissolved in liquid iron is removed in the form of SnS under the presence of sulfur in the metal. The rate of tin evaporation becomes faster with reducing the pressure in the reaction chamber. This indicates that the rate is controlled mainly by the mass transfer of SnS in the gas phase.
{"title":"減圧下における炭素飽和溶融Fe-Sn-S合金からのSnSの蒸発速度","authors":"徹也 長坂, 光兀 日野","doi":"10.2473/SHIGENTOSOZAI.113.1101","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.1101","url":null,"abstract":"The recycling of valuable resources has currently became a major worldwide subject in the industries from the viewpoint of saving energy and protection of environment. Since the accumulated amount of steel product is reaching almost one billion ton in Japan, it is very important to develop the technology for the removal of tramp-elements such as tin, copper and zinc from steel scrap. In the present work, the rate of tin removal by the evaporation from carbon saturated liquid Fe-Sn-S alloy has been studied at 1, 673 K under reduced pressure.Tin evaporates from molten iron and equimolar amount of sulfur is also removed together with tin. The evaporation rate of tin increases with increasing initial sulfur content in the melt. It is confirmed that tin dissolved in liquid iron is removed in the form of SnS under the presence of sulfur in the metal. The rate of tin evaporation becomes faster with reducing the pressure in the reaction chamber. This indicates that the rate is controlled mainly by the mass transfer of SnS in the gas phase.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"71 2 1","pages":"1101-1105"},"PeriodicalIF":0.0,"publicationDate":"1997-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78403794","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 : 1997-12-25DOI: 10.2473/SHIGENTOSOZAI.113.1074
S. Nagib, K. Inoue, Yuji Koga
The total dissolution of spent hydrodesulfurization catalyst (HDS) in sulfuric acid yields an acidic solution containing a certain amount of rare metals like molybdenum, vanadium, cobalt, nickel, and a small amount of iron as well as large excess of aluminum. In order to recover Co and Ni from the raffinate after the selective extraction of Mo and V with phosphinic acid extractants such as CYANEX 272 and PIA-8, a systematic investigation was conducted on the synergistic extraction with the mixed solvents consisting of dinonylnaphthalenesulfonic acid (DNNSA) and a series of N-alkyl-bis-picolylamine such as tri-decyl-picolylamine (TDPA), oleylpicolylamine (OLPA), and octa-decyl-picolylamine (ODPA). It was elucidated that all of these mixtures could exhibit a good synergistic effect for the extraction of Co, and Ni, while, the extraction of Al was considerably suppressed. In particular, the mixture of TDPA, or OLPA in combination with DNNSA appeared to be the most feasible and economic because it has rapid extraction rate, good phase separation, and high selectivity for Co and Ni over Al. Stripping of the loaded Ni and Co can be achieved by 0.5 and 1 M sulfuric acid and hydrochloric acid, respectively. However, smooth phase disengagement was not observed, which should be improved in future, for example by employing picolylamines with highly branched alkyl chains at tail position.
{"title":"Recycling. Recovery of Nickel and Cobalt from Spent Catalyst by Means of Solvent Extraction with Synergistic Mixtures of Picolylamine in Combination with DNNSA.","authors":"S. Nagib, K. Inoue, Yuji Koga","doi":"10.2473/SHIGENTOSOZAI.113.1074","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.1074","url":null,"abstract":"The total dissolution of spent hydrodesulfurization catalyst (HDS) in sulfuric acid yields an acidic solution containing a certain amount of rare metals like molybdenum, vanadium, cobalt, nickel, and a small amount of iron as well as large excess of aluminum. In order to recover Co and Ni from the raffinate after the selective extraction of Mo and V with phosphinic acid extractants such as CYANEX 272 and PIA-8, a systematic investigation was conducted on the synergistic extraction with the mixed solvents consisting of dinonylnaphthalenesulfonic acid (DNNSA) and a series of N-alkyl-bis-picolylamine such as tri-decyl-picolylamine (TDPA), oleylpicolylamine (OLPA), and octa-decyl-picolylamine (ODPA). It was elucidated that all of these mixtures could exhibit a good synergistic effect for the extraction of Co, and Ni, while, the extraction of Al was considerably suppressed. In particular, the mixture of TDPA, or OLPA in combination with DNNSA appeared to be the most feasible and economic because it has rapid extraction rate, good phase separation, and high selectivity for Co and Ni over Al. Stripping of the loaded Ni and Co can be achieved by 0.5 and 1 M sulfuric acid and hydrochloric acid, respectively. However, smooth phase disengagement was not observed, which should be improved in future, for example by employing picolylamines with highly branched alkyl chains at tail position.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"8 1","pages":"1074-1077"},"PeriodicalIF":0.0,"publicationDate":"1997-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90657209","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 : 1997-12-25DOI: 10.2473/SHIGENTOSOZAI.113.1110
勉功 山口, 要一 武田
A mixture of iron, copper and carbon was melted in a carbon crucible at 1, 453 K. The top layer which was rich in iron and the bottom layer which was rich in copper were clearly separated in the crucible. We could thus make fundamental experiment to carry out a phase separation for copper recovery from iron scrap containing copper. One of the focuses is the effect on the phase separation and the suspension of an extra element to the Fe-Cu-C ternary system. We added Cr, Mn, Al, Si or S to Fe-Cu-C ternary system, and determined the compositions of miscibility gap at 1, 453 K under carbon saturation. In some cases scrap contains precious metal. On this account the recovery distribution ratios of precious metal were also measured.The alloy compositions on the miscibility gap in the Fe-Cu-C system are 91.1% Fe-4.7% Cu-4.2%C and 96.7%Cu-3.3% Fe. Addition of aluminum, Silicon or sulfur causes the gap to narrow. An increase in carbon solubility in the phase rich in iron reduces copper solubility, which affects recovery of copper from scrap. The relation between copper and carbon solubility in the phase rich in iron is(% Cu)=0.68 (%C) 2-7.26 (%C) +22.77Gold, silver and palladium are enriched in the phase rich in copper. Platinum distributes both phases equally. The activity coefficients of Ag, Au, Pd and Pt were estimated from the distribution ratios.
{"title":"Fe-Cu-C系2液相分離による低品位銅スクラップからの銅の濃縮","authors":"勉功 山口, 要一 武田","doi":"10.2473/SHIGENTOSOZAI.113.1110","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.1110","url":null,"abstract":"A mixture of iron, copper and carbon was melted in a carbon crucible at 1, 453 K. The top layer which was rich in iron and the bottom layer which was rich in copper were clearly separated in the crucible. We could thus make fundamental experiment to carry out a phase separation for copper recovery from iron scrap containing copper. One of the focuses is the effect on the phase separation and the suspension of an extra element to the Fe-Cu-C ternary system. We added Cr, Mn, Al, Si or S to Fe-Cu-C ternary system, and determined the compositions of miscibility gap at 1, 453 K under carbon saturation. In some cases scrap contains precious metal. On this account the recovery distribution ratios of precious metal were also measured.The alloy compositions on the miscibility gap in the Fe-Cu-C system are 91.1% Fe-4.7% Cu-4.2%C and 96.7%Cu-3.3% Fe. Addition of aluminum, Silicon or sulfur causes the gap to narrow. An increase in carbon solubility in the phase rich in iron reduces copper solubility, which affects recovery of copper from scrap. The relation between copper and carbon solubility in the phase rich in iron is(% Cu)=0.68 (%C) 2-7.26 (%C) +22.77Gold, silver and palladium are enriched in the phase rich in copper. Platinum distributes both phases equally. The activity coefficients of Ag, Au, Pd and Pt were estimated from the distribution ratios.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"10 1","pages":"1110-1114"},"PeriodicalIF":0.0,"publicationDate":"1997-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79488288","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 : 1997-11-01DOI: 10.2473/SHIGENTOSOZAI.113.842
敦 柴山, Shibayama Atsushi, Mori Sukeyuki, 祐行 森, Haraguchi Tsuyoshi, Izumi Takashi, 享志 泉, 茂実 永留, N. Shigemi
In the few studies devoted to increase the grinding efficiency of a Tower Mill Pulverizer, it has been possible to produce particles finer than 10μm. The problem now is to increase effectively the weight of fine particles in the products. To achieve this goal the weight and particle size distribution of products, and also the electric consumption of the Tower Mill KD-3 were investigated by varying the speed of the stirring screw from 1.08 s-1to 1.58 s-1.The results of the tests can be summerized as follows:(1) The weight of products in the classifying column and the cyclone, and the electric consumption of the stirring motor increase with the speed of the stirring screw, while the specific energy (J/kg) remains constant.(2) The particle size distribution of the products in the classifying column and the cyclone are not influenced by the stirring screw speed.
{"title":"Influence of Stirring Screw Speed on Grinding Efficiency of the Tower Mill KD-3","authors":"敦 柴山, Shibayama Atsushi, Mori Sukeyuki, 祐行 森, Haraguchi Tsuyoshi, Izumi Takashi, 享志 泉, 茂実 永留, N. Shigemi","doi":"10.2473/SHIGENTOSOZAI.113.842","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.842","url":null,"abstract":"In the few studies devoted to increase the grinding efficiency of a Tower Mill Pulverizer, it has been possible to produce particles finer than 10μm. The problem now is to increase effectively the weight of fine particles in the products. To achieve this goal the weight and particle size distribution of products, and also the electric consumption of the Tower Mill KD-3 were investigated by varying the speed of the stirring screw from 1.08 s-1to 1.58 s-1.The results of the tests can be summerized as follows:(1) The weight of products in the classifying column and the cyclone, and the electric consumption of the stirring motor increase with the speed of the stirring screw, while the specific energy (J/kg) remains constant.(2) The particle size distribution of the products in the classifying column and the cyclone are not influenced by the stirring screw speed.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"1 1","pages":"842-846"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79485593","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 : 1997-11-01DOI: 10.2473/SHIGENTOSOZAI.113.805
Takayoshi Shinkuma, H. Fujii, T. Nishiyama
The instability in metal price is a very serious problem in the metal industry. There are many factors such as depletion of mineral deposits and exogenous shocks represented by wars and worldwide business fluctuations determining the phases of price increases or decreases. Resource economists have mainly focused on theoretical models which often ignore unexpected shocks on demand, while mining engineers have regarded exogenous shocks as an important factor to explain metal prices. In this study, a combined model is propos ed. This model was examined by using the actual trends in copper prices between 1945 and 1993. This model predicts that the price of copper will fall in the near future.
{"title":"A Price Formation Mechanism of Metals and Its Application for Copper.","authors":"Takayoshi Shinkuma, H. Fujii, T. Nishiyama","doi":"10.2473/SHIGENTOSOZAI.113.805","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.805","url":null,"abstract":"The instability in metal price is a very serious problem in the metal industry. There are many factors such as depletion of mineral deposits and exogenous shocks represented by wars and worldwide business fluctuations determining the phases of price increases or decreases. Resource economists have mainly focused on theoretical models which often ignore unexpected shocks on demand, while mining engineers have regarded exogenous shocks as an important factor to explain metal prices. In this study, a combined model is propos ed. This model was examined by using the actual trends in copper prices between 1945 and 1993. This model predicts that the price of copper will fall in the near future.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"46 1","pages":"805-810"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90266355","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 : 1997-09-01DOI: 10.2473/SHIGENTOSOZAI.113.707
Tomohiro Shikauchi, R. Shimpo, O. Ogawa
{"title":"Effect of Composition and Flow Rate of Blowing Gas on the Temperature Profile in a Sintering Machine of ISP","authors":"Tomohiro Shikauchi, R. Shimpo, O. Ogawa","doi":"10.2473/SHIGENTOSOZAI.113.707","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.707","url":null,"abstract":"","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"71 1","pages":"707-712"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90356328","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 : 1997-09-01DOI: 10.2473/SHIGENTOSOZAI.113.677
Li Bingrui, Inoue Masahiro, 雅弘 井上, Uchino Kenichi, 健一 内野
The present paper describes the result of an application of the authors proposed method for optimizing a mine ventilation system to an actual mine. Practical methods for the optimization considering airflow distribution, energy consumption and other parameters are discussed. Also, an existence condition of an roadway which shows the cost saving character when the resistance is decreased by the excavation of an new roadway parallel to it or enlarging the sectional area of it is examined. The results are summarized as follows: (1) The application of an actual mine shows that the proposed method is practicable and gives effective methods for saving ventilation cost. (2) The effectiveness of the decrease in roadway resistance as an method for the saving of ventilation cost depends on the airflow rate, total cost and the time that the roadway is to be utilized.
{"title":"Studies of a Mine Ventilation System Optimization Based on Actual Mine Data. A study on the optimum control of a mine ventilation system (4 th Report).","authors":"Li Bingrui, Inoue Masahiro, 雅弘 井上, Uchino Kenichi, 健一 内野","doi":"10.2473/SHIGENTOSOZAI.113.677","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.677","url":null,"abstract":"The present paper describes the result of an application of the authors proposed method for optimizing a mine ventilation system to an actual mine. Practical methods for the optimization considering airflow distribution, energy consumption and other parameters are discussed. Also, an existence condition of an roadway which shows the cost saving character when the resistance is decreased by the excavation of an new roadway parallel to it or enlarging the sectional area of it is examined. The results are summarized as follows: (1) The application of an actual mine shows that the proposed method is practicable and gives effective methods for saving ventilation cost. (2) The effectiveness of the decrease in roadway resistance as an method for the saving of ventilation cost depends on the airflow rate, total cost and the time that the roadway is to be utilized.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"25 1","pages":"677-682"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77177437","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 : 1997-08-25DOI: 10.2473/SHIGENTOSOZAI.113.635
南日 文, 光久 日野, 龍鶴 李, 板垣 乙未生
In order to clarify the behavior of the metallurgical phases in the oxidation zone of the QSL lead smelting process, the phase equilibrium between the metallic lead and the PbO-FeOx-CaO-SiO2or PbO-FeOx-CaO-SiO2-ZnO slag was investigated at 1, 423 K. The EMF method using a solid electrolyte with calcia-stabilized zirconia was applied to measure the oxygen partial pressure in the system. The oxygen pressure increases with increasing PbO content in the slag. The PbO activity and activity coefficient estimated from the oxygen pressure increase with the addition of CaO into the slag. However, the PbO activity is slightly affected by the FeOxcontent at constant PbO concentration in the experimental region. Itwas clarified that ZnO gives a small effect to the activity coefficient of PbO in the PbO-FeOx-CaO-SiO2-ZnO slag. The partial pressure of the PbO component in the gas phasecalculated by using the PbO activity coefficient in the slag isconsiderably small compared with that of metallic lead.
为了弄清QSL铅熔炼过程中氧化区冶金相的行为，在1423 K温度下研究了金属铅与pbo - feox - cao - sio2或PbO-FeOx-CaO-SiO2-ZnO渣的相平衡。采用含钙稳定氧化锆固体电解质的电动势法测量了系统中的氧分压。氧压随炉渣中PbO含量的增加而升高。由氧压估算的PbO活度和活度系数随着CaO的加入而增加。在实验区域内，当PbO浓度不变时，氧化铁含量对PbO活性的影响较小。结果表明，氧化锌对PbO- feox - cao - sio2 -ZnO渣中PbO的活度系数影响较小。用炉渣中PbO活度系数计算的PbO组分气相分压比金属铅的分压小得多。
{"title":"金属鉛とPbO-FeOx-CaO-SiO2系ないしはPbO-FeOx-CaOSiO2-ZnO系スラグ間の1, 423Kにおける相平衡","authors":"南日 文, 光久 日野, 龍鶴 李, 板垣 乙未生","doi":"10.2473/SHIGENTOSOZAI.113.635","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.635","url":null,"abstract":"In order to clarify the behavior of the metallurgical phases in the oxidation zone of the QSL lead smelting process, the phase equilibrium between the metallic lead and the PbO-FeOx-CaO-SiO2or PbO-FeOx-CaO-SiO2-ZnO slag was investigated at 1, 423 K. The EMF method using a solid electrolyte with calcia-stabilized zirconia was applied to measure the oxygen partial pressure in the system. The oxygen pressure increases with increasing PbO content in the slag. The PbO activity and activity coefficient estimated from the oxygen pressure increase with the addition of CaO into the slag. However, the PbO activity is slightly affected by the FeOxcontent at constant PbO concentration in the experimental region. Itwas clarified that ZnO gives a small effect to the activity coefficient of PbO in the PbO-FeOx-CaO-SiO2-ZnO slag. The partial pressure of the PbO component in the gas phasecalculated by using the PbO activity coefficient in the slag isconsiderably small compared with that of metallic lead.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"22 1","pages":"635-640"},"PeriodicalIF":0.0,"publicationDate":"1997-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83219113","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 : 1997-07-01DOI: 10.2473/SHIGENTOSOZAI.113.577
Eisetsu Oi, S. Arai, E. Kikuchi, S. Ito
Precious metals are recycled from electric devices. In this study, metallic fragments from shredded mixture were separated using an air table. The air table has a shaking deck motion similar to a wet table and a blast of air is driven through a perforated deck. Several experiments were carried out to demonstrate the effect of frequency, slope angle of the inclined deck and air velocity on separation efficiency. The results indicated that the end slope of inclined deck exerted a great influence of the separation of metallic fragments. The optimum treatment condition was as follows: The angle of slope was 6.5 degrees, frequency of shaking deck was 500 min -1, and air velocity were 1.0-2.0 m·Es-1. The overall separation efficiency at that time was 0.95.
贵重金属可从电子设备中回收。在这项研究中，金属碎片从粉碎混合物分离使用空气台。空气表有一个类似于湿表的震动甲板运动，一股空气被驱动通过穿孔的甲板。通过实验验证了频率、斜甲板倾角和风速对分离效率的影响。结果表明，斜甲板端部坡度对金属碎块的分离有较大影响。最佳处理条件为:坡角为6.5°，震动甲板频率为500 min -1，风速为1.0 ~ 2.0 m·Es-1。当时的总分离效率为0.95。
{"title":"Separation of Metallic Fragments from Shredded Electric Devices Using Air Table","authors":"Eisetsu Oi, S. Arai, E. Kikuchi, S. Ito","doi":"10.2473/SHIGENTOSOZAI.113.577","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.577","url":null,"abstract":"Precious metals are recycled from electric devices. In this study, metallic fragments from shredded mixture were separated using an air table. The air table has a shaking deck motion similar to a wet table and a blast of air is driven through a perforated deck. Several experiments were carried out to demonstrate the effect of frequency, slope angle of the inclined deck and air velocity on separation efficiency. The results indicated that the end slope of inclined deck exerted a great influence of the separation of metallic fragments. The optimum treatment condition was as follows: The angle of slope was 6.5 degrees, frequency of shaking deck was 500 min -1, and air velocity were 1.0-2.0 m·Es-1. The overall separation efficiency at that time was 0.95.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"2 1","pages":"577-581"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80825526","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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