K. Fujii, Koudai Nagano, Tasuma Suzuki, Masakazu Niinae
The demand for PGMs is increasing year by year due to their excellent physical and chemical properties. Moreover, in order to meet the demand, it is important to develop a highly efficient recovery process of PGMs from secondary resources. Solvent extraction applied to refining process for PGMs offers several advantages over the traditional pre cipitation methods and distillation. Solvent extraction efficiency of Rh and Ru from chloride solutions is very low. How ever, the extraction efficiency of Rh and Ru can be improved by adding Sn(II) to chloride solutions. In the present study, the extraction of Rh and Ru from hydrochloric acid solutions with tri-n-octylamine (TOA) and trioctyl methyl ammonium chloride (TOMAC) diluted with benzene were tested to clarify the effect of addition of Sn(II) on the extraction of Rh and Ru and stripping of Rh and Ru. The addition of Sn(II) was effective for the extraction of Rh and Ru and the stripping of Rh and Ru with solutions of sodium nitrite prepared with sodium hydoxide was effective.
{"title":"Solvent Extraction of Rhodium and Ruthenium from Chloride Solutions added Tin(II) with TOA and TOMAC in Benzene","authors":"K. Fujii, Koudai Nagano, Tasuma Suzuki, Masakazu Niinae","doi":"10.4144/rpsj.68.57","DOIUrl":"https://doi.org/10.4144/rpsj.68.57","url":null,"abstract":"The demand for PGMs is increasing year by year due to their excellent physical and chemical properties. Moreover, in order to meet the demand, it is important to develop a highly efficient recovery process of PGMs from secondary resources. Solvent extraction applied to refining process for PGMs offers several advantages over the traditional pre cipitation methods and distillation. Solvent extraction efficiency of Rh and Ru from chloride solutions is very low. How ever, the extraction efficiency of Rh and Ru can be improved by adding Sn(II) to chloride solutions. In the present study, the extraction of Rh and Ru from hydrochloric acid solutions with tri-n-octylamine (TOA) and trioctyl methyl ammonium chloride (TOMAC) diluted with benzene were tested to clarify the effect of addition of Sn(II) on the extraction of Rh and Ru and stripping of Rh and Ru. The addition of Sn(II) was effective for the extraction of Rh and Ru and the stripping of Rh and Ru with solutions of sodium nitrite prepared with sodium hydoxide was effective.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86996170","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}
Steel converter slag, a by-product of iron- and steel-making plants, was converted into a hydrogarnet-containing product using the alkali fusion method. The converter slag was transformed into an alkali-fused slag with reactive phases via alkali fusion using sodium hydroxide at 600°C for 6 h, after which the fused slag was stirred in distilled water at ambient temperature to prepare a precursor to synthesize a product, comprising hydrogarnet, by heating the precursor at 80°C. This product could remove HCl gas at a high temperature (800°C) and showed higher Cl fixation than slag and lime. These results suggest that a novel product capable of removing HCl gas at high temperatures can be synthesized from converter slag via alkali fusion.
{"title":"Conversion of Steel Converter Slag into HCl Gas Scavenger Using Alkali Fusion","authors":"T. Wajima","doi":"10.4144/rpsj.68.64","DOIUrl":"https://doi.org/10.4144/rpsj.68.64","url":null,"abstract":"Steel converter slag, a by-product of iron- and steel-making plants, was converted into a hydrogarnet-containing product using the alkali fusion method. The converter slag was transformed into an alkali-fused slag with reactive phases via alkali fusion using sodium hydroxide at 600°C for 6 h, after which the fused slag was stirred in distilled water at ambient temperature to prepare a precursor to synthesize a product, comprising hydrogarnet, by heating the precursor at 80°C. This product could remove HCl gas at a high temperature (800°C) and showed higher Cl fixation than slag and lime. These results suggest that a novel product capable of removing HCl gas at high temperatures can be synthesized from converter slag via alkali fusion.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74627789","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}
S. Soda, Ryo Sasaki, Thi Thu Huong Nguyen, Kentaro Hayashi, A. Kanayama
A lab-scale experimental system accommodating soil and plants was designed to evaluate the applicability of constructed wetlands (CWs) to mine drainage treatment. Synthetic wastewater containing Cd (0.11 mg/L) and other minerals (pH 6.8) was prepared based on the chemical composition of an actual neutral mine drainage (NMD). In lab-scale CWs consisted of a column (ID 12.5 cm, H 50 cm) filled with pumice stones and loamy soil were planted reed (Reed-CW) or cattail (Cattail-CW) plants. Some were left unplanted (Unplanted CW). The synthetic NMD (2.0 L) was treated in a 1-week cycle sequencing batch mode in the CWs in a greenhouse. The unplanted CW removed cadmium sufficiently to satisfy the effluent standard (0.03 mg/L) from the NMD, mainly by soil adsorption. Presence of the emergent plants, especially cattail, enhanced metal removal possibly by filtration with their elongated roots and metal sulfide precipitation by sulfate-reducing bacteria in the rhizosphere of the Cattail-CW.
{"title":"A Laboratory Experiment System for Developing Mine Drainage Treatment Technologies Using Constructed Wetlands—Sequencing Batch Treatment of Cd-Containing Neutral Mine Drainage—","authors":"S. Soda, Ryo Sasaki, Thi Thu Huong Nguyen, Kentaro Hayashi, A. Kanayama","doi":"10.4144/RPSJ.67.111","DOIUrl":"https://doi.org/10.4144/RPSJ.67.111","url":null,"abstract":"A lab-scale experimental system accommodating soil and plants was designed to evaluate the applicability of constructed wetlands (CWs) to mine drainage treatment. Synthetic wastewater containing Cd (0.11 mg/L) and other minerals (pH 6.8) was prepared based on the chemical composition of an actual neutral mine drainage (NMD). In lab-scale CWs consisted of a column (ID 12.5 cm, H 50 cm) filled with pumice stones and loamy soil were planted reed (Reed-CW) or cattail (Cattail-CW) plants. Some were left unplanted (Unplanted CW). The synthetic NMD (2.0 L) was treated in a 1-week cycle sequencing batch mode in the CWs in a greenhouse. The unplanted CW removed cadmium sufficiently to satisfy the effluent standard (0.03 mg/L) from the NMD, mainly by soil adsorption. Presence of the emergent plants, especially cattail, enhanced metal removal possibly by filtration with their elongated roots and metal sulfide precipitation by sulfate-reducing bacteria in the rhizosphere of the Cattail-CW.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72818890","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}
More than 200 spacecraft have successfully explored about 100 extraterrestrial bodies, including all planets and their major satellites. In-situ observations and return-sample analyses revealed the orbital parameters and compositional distributions of solar system bodies, which are essential to discuss possible utilization of space materials. At an early stage of the future in-situ resource utilization (ISRU), the availability of volatiles, including water on asteroids and putative ice on the Moon, becomes a primary issue, especially for their utilization as propellants. Autonomous trans-portation systems between solar bodies would then be supported by such volatile materials obtained on small bodies. Infrastructures, including bases, could be developed with materials excavated from appropriate bodies and transferred through such a system. Extensive utilization of space resources on Earth may happen but not in the near future.
{"title":"Results of Solar System Explorations and Their Implications to the Utilization of Space Resources","authors":"H. Miyamoto","doi":"10.4144/rpsj.68.3","DOIUrl":"https://doi.org/10.4144/rpsj.68.3","url":null,"abstract":"More than 200 spacecraft have successfully explored about 100 extraterrestrial bodies, including all planets and their major satellites. In-situ observations and return-sample analyses revealed the orbital parameters and compositional distributions of solar system bodies, which are essential to discuss possible utilization of space materials. At an early stage of the future in-situ resource utilization (ISRU), the availability of volatiles, including water on asteroids and putative ice on the Moon, becomes a primary issue, especially for their utilization as propellants. Autonomous trans-portation systems between solar bodies would then be supported by such volatile materials obtained on small bodies. Infrastructures, including bases, could be developed with materials excavated from appropriate bodies and transferred through such a system. Extensive utilization of space resources on Earth may happen but not in the near future.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73738878","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}
Shingo Tomiyama, Tsubasa Hagino, T. Igarashi, M. Sakoda, Y. Masaki
This paper describes the geochemistry of acid mine drainage (AMD) and river water around the Date Mine in southwest Hokkaido, Japan. The mine is located in a sulfide deposit that contains pyrite and generates AMD, which is currently being neutralized; however, the introduction of a passive treatment system (PTS) is being considered. In preparation for the introduction of the PTS, this study aims to evaluate the environmental impact of untreated AMD flowing into rivers. The flow rate of the river depends on precipitation, and the ratio of AMD to that of the river was in the range 0.0014–0.018. In mixing experiments of AMD and river water based on measured results, the formation of iron and copper precipitates with increasing pH was observed, which suggests the possibility of self-purification phe- nomena of heavy metals in the river. The calculated oxidation rate of Fe(II) increased with pH. The surface complexa-tion model in PHREEQC reproduced Cu concentration decrease due to coprecipitation with iron hydroxide. Assuming that untreated AMD is mixed with the river water, the Fe 2+ concentration decreased from 0.19 mg L –1 to 0.003 mg L –1 in the river.
本文描述了日本北海道西南部枣矿周围酸性矿井水(AMD)和河水的地球化学特征。该矿位于硫化物矿床中，含有黄铁矿并产生AMD，目前正在中和;然而，正在考虑引进被动治疗系统(PTS)。为了准备引入PTS，本研究旨在评估未经处理的AMD流入河流的环境影响。河流的流量取决于降水，AMD与河流的比值在0.0014-0.018之间。在实测结果的基础上，进行了AMD与河水的混合实验，观察到随着pH值的增加，铁和铜沉淀的形成，表明河水中重金属存在自净化现象的可能性。计算得到的Fe(II)氧化速率随ph的增加而增加。PHREEQC中的表面络合模型再现了Cu浓度因与氢氧化铁共沉淀而降低。假设未经处理的AMD与河水混合，河水中fe2 +浓度从0.19 mg L -1下降到0.003 mg L -1。
{"title":"Effects of Acid Mine Drainage from the Date Mine on Nearby Rivers","authors":"Shingo Tomiyama, Tsubasa Hagino, T. Igarashi, M. Sakoda, Y. Masaki","doi":"10.4144/RPSJ.67.128","DOIUrl":"https://doi.org/10.4144/RPSJ.67.128","url":null,"abstract":"This paper describes the geochemistry of acid mine drainage (AMD) and river water around the Date Mine in southwest Hokkaido, Japan. The mine is located in a sulfide deposit that contains pyrite and generates AMD, which is currently being neutralized; however, the introduction of a passive treatment system (PTS) is being considered. In preparation for the introduction of the PTS, this study aims to evaluate the environmental impact of untreated AMD flowing into rivers. The flow rate of the river depends on precipitation, and the ratio of AMD to that of the river was in the range 0.0014–0.018. In mixing experiments of AMD and river water based on measured results, the formation of iron and copper precipitates with increasing pH was observed, which suggests the possibility of self-purification phe- nomena of heavy metals in the river. The calculated oxidation rate of Fe(II) increased with pH. The surface complexa-tion model in PHREEQC reproduced Cu concentration decrease due to coprecipitation with iron hydroxide. Assuming that untreated AMD is mixed with the river water, the Fe 2+ concentration decreased from 0.19 mg L –1 to 0.003 mg L –1 in the river.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91007039","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}
M. Miyatake, Koshiro Takase, J. Hirose, K. Shiomori, H. Yokoi
This study aimed to facilitate efficient arsenic detoxification by inducing the microbial methylation of inorganic arsenic. Recombinant Escherichia coli strains K63 and KC42 were transformed to overexpress arsenic methyltransferase, and the methylation of inorganic arsenic was evaluated using the enzyme extracted from these strains. To ensure continuous reactions by maintaining enzymatic activity, the extracted enzyme was immobilized in microcapsules (MC) to catalyze the methylation of inorganic arsenic. The total yield of methylated organic arsenic compounds in strain K63 was 32.9% (after 2 h of incubation at pH 7.0 and 35°C), of which trimethyl arsenic compounds (TMAC) accounted for 8.3%. The total yield in strain KC42 was 35.9% (after 2 h of incubation at pH 6.5 and 35°C), of which TMAC accounted for 10.8%. When arsenic was methylated using MC prepared with the crude enzyme solution, the total yield of methylated organic arsenic compounds was 12.6% and 5.7% in strains K63 and KC42, respectively. The residual enzymatic activity was calculated to be 53.1% and 48.8% in strains K63 and KC42, respectively. Future studies should aim to increase the residual enzymatic activity, thus elevating the yield of organic arsenic compounds, by optimizing the conditions for enzyme immobilization in MCs.
{"title":"Study on Arsenic Methyltransferase Expressed in Recombinant E. coli","authors":"M. Miyatake, Koshiro Takase, J. Hirose, K. Shiomori, H. Yokoi","doi":"10.4144/RPSJ.67.80","DOIUrl":"https://doi.org/10.4144/RPSJ.67.80","url":null,"abstract":"This study aimed to facilitate efficient arsenic detoxification by inducing the microbial methylation of inorganic arsenic. Recombinant Escherichia coli strains K63 and KC42 were transformed to overexpress arsenic methyltransferase, and the methylation of inorganic arsenic was evaluated using the enzyme extracted from these strains. To ensure continuous reactions by maintaining enzymatic activity, the extracted enzyme was immobilized in microcapsules (MC) to catalyze the methylation of inorganic arsenic. The total yield of methylated organic arsenic compounds in strain K63 was 32.9% (after 2 h of incubation at pH 7.0 and 35°C), of which trimethyl arsenic compounds (TMAC) accounted for 8.3%. The total yield in strain KC42 was 35.9% (after 2 h of incubation at pH 6.5 and 35°C), of which TMAC accounted for 10.8%. When arsenic was methylated using MC prepared with the crude enzyme solution, the total yield of methylated organic arsenic compounds was 12.6% and 5.7% in strains K63 and KC42, respectively. The residual enzymatic activity was calculated to be 53.1% and 48.8% in strains K63 and KC42, respectively. Future studies should aim to increase the residual enzymatic activity, thus elevating the yield of organic arsenic compounds, by optimizing the conditions for enzyme immobilization in MCs.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75308160","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}
The demand for lithium-ion batteries has been rapidly increasing in the modern electronics and electric vehicle industries. Tremendous lithium-ion battery consumption leads to an increase in battery scrap, which has to be recycled to relieve the shortage of rare resources. We examined a new process for separation of lithium and cobalt ions, and the regeneration of nitric acid from their mixture solution by use of electrodialysis with water splitting and monovalent cation selective bipolar membranes. In the experiment with an electrodialysis cell divided between an anode and cathode with a water splitting, an anion exchange, a monovalent cation selective, and a water-splitting bipolar membrane, lithium ion selectively permeates to strip compartment through monovalent cation selective bipolar membrane. The nitrate ion also permeates through the anion-exchange membrane and regenerated to nitric acid solution by water splitting bipolar membrane. These results revealed that electrodialysis using water splitting and monovalent cation selective bipolar membrane is applicable to the selective separation of lithium and cobalt ions, and regeneration of nitric acid solution.
{"title":"Separation of Lithium and Cobalt Ions and Regeneration of Nitric Acid by Electrodialysis Using Bipolar Membranes for Water Splitting and Monovalent Cation Selective Bipolar Membranes","authors":"Hiroshi Takahashi, Satomi Takao, Etsuko Kashiuchi","doi":"10.4144/rpsj.66.123","DOIUrl":"https://doi.org/10.4144/rpsj.66.123","url":null,"abstract":"The demand for lithium-ion batteries has been rapidly increasing in the modern electronics and electric vehicle industries. Tremendous lithium-ion battery consumption leads to an increase in battery scrap, which has to be recycled to relieve the shortage of rare resources. We examined a new process for separation of lithium and cobalt ions, and the regeneration of nitric acid from their mixture solution by use of electrodialysis with water splitting and monovalent cation selective bipolar membranes. In the experiment with an electrodialysis cell divided between an anode and cathode with a water splitting, an anion exchange, a monovalent cation selective, and a water-splitting bipolar membrane, lithium ion selectively permeates to strip compartment through monovalent cation selective bipolar membrane. The nitrate ion also permeates through the anion-exchange membrane and regenerated to nitric acid solution by water splitting bipolar membrane. These results revealed that electrodialysis using water splitting and monovalent cation selective bipolar membrane is applicable to the selective separation of lithium and cobalt ions, and regeneration of nitric acid solution.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88132366","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}
{"title":"Synthesis of Hydrocalumite-like Compound from Blast Furnace Slag by Alkali Fusion using Waste Molten-Slag Heat, and Its Anion Removal Ability","authors":"T. Wajima","doi":"10.4144/RPSJ.67.86","DOIUrl":"https://doi.org/10.4144/RPSJ.67.86","url":null,"abstract":"","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81202372","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}
Silica scale formation is one of the potential problems for the practical operation of geothermal plants. In this study, we examined optimal pH (3, 6 and 9) and temperature (298–353 K) conditions for the treatment process of waste geothermal fluids using a silica polymerization kinetics calculation. The kinetic model of Fleming was applied to nuclear growth and rate-limiting steps. The polymerization rate at pH 9 was about 3 times higher than that at pH 6 dur ing the nucleus growth process, whereas these speeds did not change due to the difference in temperature. The pseudo- equilibrium concentration at pH 6 followed Van’t Hoff theory, but that at pH 9 was higher at 298 K than that at 313 K. Our results, therefore, suggest neutral pH conditions are the most suitable to suppress the silica scale, and then the opti mal temperature for the treatment could be estimated from the initial silica concentration according to this kinetic model.
{"title":"pH and Temperature Effects for Kinetics of Silica Polymerization toward Silica Scale Suppression","authors":"Shota Tajima, S. Fuchida, Tatsuya Kato, C. Tokoro","doi":"10.4144/rpsj.67.22","DOIUrl":"https://doi.org/10.4144/rpsj.67.22","url":null,"abstract":"Silica scale formation is one of the potential problems for the practical operation of geothermal plants. In this study, we examined optimal pH (3, 6 and 9) and temperature (298–353 K) conditions for the treatment process of waste geothermal fluids using a silica polymerization kinetics calculation. The kinetic model of Fleming was applied to nuclear growth and rate-limiting steps. The polymerization rate at pH 9 was about 3 times higher than that at pH 6 dur ing the nucleus growth process, whereas these speeds did not change due to the difference in temperature. The pseudo- equilibrium concentration at pH 6 followed Van’t Hoff theory, but that at pH 9 was higher at 298 K than that at 313 K. Our results, therefore, suggest neutral pH conditions are the most suitable to suppress the silica scale, and then the opti mal temperature for the treatment could be estimated from the initial silica concentration according to this kinetic model.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75207841","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}
K. Kanoya, K. Sugamoto, Y. Baba, Takanori Tsukazaki
The organic solvent is a liquid organic compound capable of dissolving a water-insoluble compound. In the solvent extraction method which is one of metal refining techniques, the large amount of organic solvent plays an important role not only to solubilize the extractant but also to affect the extraction behavior of metal complexes formed in the organic phase. However, most organic solvents have high volatility and toxicity, and their use is limited owing to health damage and environmental burden. In this study, we synthesized activated carbon impregnated extractant without organic solvent and aimed to separate Co and Ni. Specifically, activated carbon was impregnated with 2-isonitrosopropiophenone as extractant, and the effect on Ni and Co separation characteristics was investigated. As a result, the activated carbon was able to selectively adsorb Co over Ni compared to toluene diluent and that this activated carbon had high adsorption capacity for Co and leakage of extractant lower.
{"title":"Separation Properties of Ni and Co with Extractant Impregnated-Activated Carbon","authors":"K. Kanoya, K. Sugamoto, Y. Baba, Takanori Tsukazaki","doi":"10.4144/rpsj.67.5","DOIUrl":"https://doi.org/10.4144/rpsj.67.5","url":null,"abstract":"The organic solvent is a liquid organic compound capable of dissolving a water-insoluble compound. In the solvent extraction method which is one of metal refining techniques, the large amount of organic solvent plays an important role not only to solubilize the extractant but also to affect the extraction behavior of metal complexes formed in the organic phase. However, most organic solvents have high volatility and toxicity, and their use is limited owing to health damage and environmental burden. In this study, we synthesized activated carbon impregnated extractant without organic solvent and aimed to separate Co and Ni. Specifically, activated carbon was impregnated with 2-isonitrosopropiophenone as extractant, and the effect on Ni and Co separation characteristics was investigated. As a result, the activated carbon was able to selectively adsorb Co over Ni compared to toluene diluent and that this activated carbon had high adsorption capacity for Co and leakage of extractant lower.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84436963","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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