Pub Date : 2008-12-25DOI: 10.2473/JOURNALOFMMIJ.124.694
T. Yoneda, H. Maeda
Compositional and structural properties of clay minerals from hydrothermal systems show highly diverse and systematic variations related to their localities. The chemical compositions of chlorite, one of the most common clay minerals, are thought to have a close relationship with its formational environments such as geological conditions, temperature, chemistry of hydrothermal solution, etc. In this study two chlorite geothermometers were considered by using the chemical composition of chlorites from some hydrothermal ore deposits in Japan. The two chlorite geothermometers are the Cathelineau's thermometer giving an empirical temperature scale of chlorite formation in an active geothermal field, and the Walshe's thermometer giving a thermodynamic temperature scale based on exchange reactions of chlorite solid solutions. On the basis of a comparison of fluid inclusion geothermometry, it is concluded that the two geothermometers can be applied to different compositional types of hydrothermal chlorite. The Cathelineau's thermometer fits well for Mg-chlorite, and the Walshe's thermometer fits for Fe-chlorite, indicating that both two chlorite geothermometers can be used as exploration indicators for geothermal reservoirs and hydrothermal ore deposits. In addition, it must be emphasized that the impurities in the chlorite should be examined in applying the chlorite geothermometers to chlorites.
{"title":"The Chemical Composition of Chlorites from Hydrothermal Ore Deposits and its Applicability to Geothermometers","authors":"T. Yoneda, H. Maeda","doi":"10.2473/JOURNALOFMMIJ.124.694","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.124.694","url":null,"abstract":"Compositional and structural properties of clay minerals from hydrothermal systems show highly diverse and systematic variations related to their localities. The chemical compositions of chlorite, one of the most common clay minerals, are thought to have a close relationship with its formational environments such as geological conditions, temperature, chemistry of hydrothermal solution, etc. In this study two chlorite geothermometers were considered by using the chemical composition of chlorites from some hydrothermal ore deposits in Japan. The two chlorite geothermometers are the Cathelineau's thermometer giving an empirical temperature scale of chlorite formation in an active geothermal field, and the Walshe's thermometer giving a thermodynamic temperature scale based on exchange reactions of chlorite solid solutions. On the basis of a comparison of fluid inclusion geothermometry, it is concluded that the two geothermometers can be applied to different compositional types of hydrothermal chlorite. The Cathelineau's thermometer fits well for Mg-chlorite, and the Walshe's thermometer fits for Fe-chlorite, indicating that both two chlorite geothermometers can be used as exploration indicators for geothermal reservoirs and hydrothermal ore deposits. In addition, it must be emphasized that the impurities in the chlorite should be examined in applying the chlorite geothermometers to chlorites.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"3 1","pages":"694-699"},"PeriodicalIF":0.0,"publicationDate":"2008-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87282884","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 : 2007-12-25DOI: 10.2473/JOURNALOFMMIJ.123.707
S. Morita, T. Ohtsuka, O. Maeda
{"title":"Production of Tungsten at Japan New Metals Co., Ltd.","authors":"S. Morita, T. Ohtsuka, O. Maeda","doi":"10.2473/JOURNALOFMMIJ.123.707","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.123.707","url":null,"abstract":"","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"17 1","pages":"707-710"},"PeriodicalIF":0.0,"publicationDate":"2007-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85482161","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 : 2007-12-25DOI: 10.2473/JOURNALOFMMIJ.123.779
M. Naki
In Japan, the domestic recycling system of the nonferrous metal is formed with two businesses. One is many collecting & sorting enterprises and processing & wholesale enterprises, which are usually small and medium-sized business. The other is nonferrous metal smelting & refining enterprises, which are usually big business. Recently legislative resource recycling system, which consists of Home Appliance Recycling Law, End-of-Life Vehicles Recycling Law, Law for Promotion of Effective Utilization of Resource and so on, has been also developed. But, in spite even in these circumstances, considerable amount of domestic occurrence scraps of copper has been exported to China, and a lot of used home appliances and used personal computers have been exported to foreign countries. Namely, it has become clear that the present resource recycling system could not circulate the resources sufficiently inside Japan.These problems were caused by rapidly increasing resource consumption of the world in these several years, which was originated by quick economic development of the Asian region, in especial in China. Tightness of worldwide resource demand has requested the advancement of creating new countermeasures and/or corresponding methods under the slogan of “conservation and effective utilization of resources” for a long time.This manuscript intoroduces these circumstances and suggested some solutions to the problems.
{"title":"Present Condition and Topics of Intermediate Processing and Industry","authors":"M. Naki","doi":"10.2473/JOURNALOFMMIJ.123.779","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.123.779","url":null,"abstract":"In Japan, the domestic recycling system of the nonferrous metal is formed with two businesses. One is many collecting & sorting enterprises and processing & wholesale enterprises, which are usually small and medium-sized business. The other is nonferrous metal smelting & refining enterprises, which are usually big business. Recently legislative resource recycling system, which consists of Home Appliance Recycling Law, End-of-Life Vehicles Recycling Law, Law for Promotion of Effective Utilization of Resource and so on, has been also developed. But, in spite even in these circumstances, considerable amount of domestic occurrence scraps of copper has been exported to China, and a lot of used home appliances and used personal computers have been exported to foreign countries. Namely, it has become clear that the present resource recycling system could not circulate the resources sufficiently inside Japan.These problems were caused by rapidly increasing resource consumption of the world in these several years, which was originated by quick economic development of the Asian region, in especial in China. Tightness of worldwide resource demand has requested the advancement of creating new countermeasures and/or corresponding methods under the slogan of “conservation and effective utilization of resources” for a long time.This manuscript intoroduces these circumstances and suggested some solutions to the problems.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"122 1","pages":"779-783"},"PeriodicalIF":0.0,"publicationDate":"2007-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82674847","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 : 2007-12-25DOI: 10.2473/JOURNALOFMMIJ.123.620
Masayuki Yamagiwa
Sumitomo Toyo Smelter and Refinery commenced its operation in 1971 with the “To Be a Pollution-Free and World’s Cleanest Copper Smelter Forever” motto.From early 1990’s to 2003, Toyo Smelter and Refinery increased its annual electrolytic copper production from 200,000 tonnes to 270,000 tonnes with the continuous technological improvements and no addition of any excess facilities. From the turn of the century, the forecast that the world copper demand would increase steady but surely especially in Asia has been rushing the other smelters into the reinforcements of their facilities and the foundations of the new plants. It is clear that this situation will lead to the age of the jungle law in the next depression. Then Sumitomo Metal Mining Co.,Ltd. has decided to increase its Toyo Smelter and Refinery’s annual production capacity to 450,000 tonnes in order to meet the demand growth and to ensure its survival by minimizing its production cost.Toyo Smelter and Refinery has finished its expansion works and would start the 450,000 tonnes production from the end of 2007.
{"title":"Copper Smelting and Refining at Sumitomo Toyo Smelter and Refinery","authors":"Masayuki Yamagiwa","doi":"10.2473/JOURNALOFMMIJ.123.620","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.123.620","url":null,"abstract":"Sumitomo Toyo Smelter and Refinery commenced its operation in 1971 with the “To Be a Pollution-Free and World’s Cleanest Copper Smelter Forever” motto.From early 1990’s to 2003, Toyo Smelter and Refinery increased its annual electrolytic copper production from 200,000 tonnes to 270,000 tonnes with the continuous technological improvements and no addition of any excess facilities. From the turn of the century, the forecast that the world copper demand would increase steady but surely especially in Asia has been rushing the other smelters into the reinforcements of their facilities and the foundations of the new plants. It is clear that this situation will lead to the age of the jungle law in the next depression. Then Sumitomo Metal Mining Co.,Ltd. has decided to increase its Toyo Smelter and Refinery’s annual production capacity to 450,000 tonnes in order to meet the demand growth and to ensure its survival by minimizing its production cost.Toyo Smelter and Refinery has finished its expansion works and would start the 450,000 tonnes production from the end of 2007.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"111 1","pages":"620-625"},"PeriodicalIF":0.0,"publicationDate":"2007-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83555778","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 : 2007-12-25DOI: 10.2473/JOURNALOFMMIJ.123.719
Satoru Takayanagi, S. Abe
The Hosokura Metal and Mining Co., Ltd. produces electrolytic lead (99.99% purity) and bismuth, antimony trioxide, crude silver etc. from recycled lead-acid batteries and various types of lead-bearing industrial intermediates. Mining and smelting of lead, zinc and silver bearing ores from the original Hosokura Mine began over 1,200 years ago, but was terminated with the closure of the mine in 1987 and, since then, the production of recycled lead and the treatment of mine wastewater have been continued. The current company was reorganized in March, 2006. Although the capacity for monthly lead production based on a blast-furnace operation followed by electro-refining is around 2,000 t /month, a serious shortage of recycled batteries triggered technology development to accept lead dross and lead residue etc.also as low grade raw material in the summer of 2005. Another main operation of this company is the treatment of mine wastewater, 15 t /min on average, from the closed mine and the effluents from lead plants to meet the water quality standard against toxic elements including lead. Overcoming the lead-leakage problem at this plant in May, 2002, the thoroughly renewed and strengthened water-treating system with a big deep bed filtration facility at the final stage enables us to contribute to the environment improvement of this area and rebuild the tight, friendly correlation with the surroundings. Both the plants are operating under the company policies of environmental conservation, compliance and community involvement.
{"title":"Lead Smelting and Refining at Hosokura Metal Mining Co., LTD","authors":"Satoru Takayanagi, S. Abe","doi":"10.2473/JOURNALOFMMIJ.123.719","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.123.719","url":null,"abstract":"The Hosokura Metal and Mining Co., Ltd. produces electrolytic lead (99.99% purity) and bismuth, antimony trioxide, crude silver etc. from recycled lead-acid batteries and various types of lead-bearing industrial intermediates. Mining and smelting of lead, zinc and silver bearing ores from the original Hosokura Mine began over 1,200 years ago, but was terminated with the closure of the mine in 1987 and, since then, the production of recycled lead and the treatment of mine wastewater have been continued. The current company was reorganized in March, 2006. Although the capacity for monthly lead production based on a blast-furnace operation followed by electro-refining is around 2,000 t /month, a serious shortage of recycled batteries triggered technology development to accept lead dross and lead residue etc.also as low grade raw material in the summer of 2005. Another main operation of this company is the treatment of mine wastewater, 15 t /min on average, from the closed mine and the effluents from lead plants to meet the water quality standard against toxic elements including lead. Overcoming the lead-leakage problem at this plant in May, 2002, the thoroughly renewed and strengthened water-treating system with a big deep bed filtration facility at the final stage enables us to contribute to the environment improvement of this area and rebuild the tight, friendly correlation with the surroundings. Both the plants are operating under the company policies of environmental conservation, compliance and community involvement.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"18 1","pages":"719-722"},"PeriodicalIF":0.0,"publicationDate":"2007-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76883713","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 : 2007-05-25DOI: 10.2473/JOURNALOFMMIJ.123.152
K. Fukui, H. Abé, M. Koizumi, H. Tomosada, S. Okubo
In this study, a series of percussive long-hole drilling tests using Inada granite was carried out to examine the effect of hole length on drilling performace. Special care was taken to clarify the attenuation of elastic wave at a sleeve coupling which connects the two rods. The main results are summarized as follows;1) The experimental results show that penetration rate decreases and rod stress attenuates with increase of hole length or number of sleeve couplings to pass through.2) Numerical simulation using the spring model proposed by Okubo et al. indicates that calculated results of elastic-wave amplitude and length agree well with experimental results.3) Penetration rate was found to be proportional to transmitted energy into the rock. Specific energy in the percussive drilling test is considerably lower than that in the static penetration test.
{"title":"Attenuation of Rod Stress in Percussive Long-Hole Drilling","authors":"K. Fukui, H. Abé, M. Koizumi, H. Tomosada, S. Okubo","doi":"10.2473/JOURNALOFMMIJ.123.152","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.123.152","url":null,"abstract":"In this study, a series of percussive long-hole drilling tests using Inada granite was carried out to examine the effect of hole length on drilling performace. Special care was taken to clarify the attenuation of elastic wave at a sleeve coupling which connects the two rods. The main results are summarized as follows;1) The experimental results show that penetration rate decreases and rod stress attenuates with increase of hole length or number of sleeve couplings to pass through.2) Numerical simulation using the spring model proposed by Okubo et al. indicates that calculated results of elastic-wave amplitude and length agree well with experimental results.3) Penetration rate was found to be proportional to transmitted energy into the rock. Specific energy in the percussive drilling test is considerably lower than that in the static penetration test.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"1 1","pages":"152-157"},"PeriodicalIF":0.0,"publicationDate":"2007-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72913733","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 : 2006-12-25DOI: 10.2473/SHIGENTOSOZAI.122.618
岳之 伊藤
The Ganji quarry is located in Tsukumi City, Ooita Prefecture. This quarry mainly supplies limestone for cement material to Ooita Plant which is one of the biggest cement plant in our company and produces other various limestone products for steel industry, chemical industry, construction industry, etc.This quarry has two production systems of No.1 and No.2. The No.1 production system produces cement material for Ooita Plant and the No.2 production system produces other products for our customers. We reconstructed its underground processing plant and for rationalization unified two control centers from the year 2001 to 2005.This report presents the background and outline of this reconstruction.
{"title":"願寺鉱山再開発工事(第1期)の概要","authors":"岳之 伊藤","doi":"10.2473/SHIGENTOSOZAI.122.618","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.122.618","url":null,"abstract":"The Ganji quarry is located in Tsukumi City, Ooita Prefecture. This quarry mainly supplies limestone for cement material to Ooita Plant which is one of the biggest cement plant in our company and produces other various limestone products for steel industry, chemical industry, construction industry, etc.This quarry has two production systems of No.1 and No.2. The No.1 production system produces cement material for Ooita Plant and the No.2 production system produces other products for our customers. We reconstructed its underground processing plant and for rationalization unified two control centers from the year 2001 to 2005.This report presents the background and outline of this reconstruction.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"131 1","pages":"618-623"},"PeriodicalIF":0.0,"publicationDate":"2006-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85612289","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 : 2006-12-25DOI: 10.2473/shigentosozai.122.564
Masa Taniguchi
In 2006, the world population reached 6.5 billion and the global economy is rapidly expanding. Consequently, global use of mineral resources have become huge. Rapidly growing China's appetite has a great impact. Therefore, it is the author's big concern over the following issues for sustainability of the world.Depletion of resources, progress of the domination by international resources majors, increasing dependence on resource-rich but politically unstable developing countries, resurgence of “resource nationalism”, beginning of world wide struggle for securing resources against possible shortage, serious environmental problems caused by massive mine development, frequent conflict between mining companies and local people, and escalating market prices.Just now, it can be said an era of “Resources Crisis”. However, in today's global economy, nation's economic security depends on access to adequate mineral resource supplies from a variety of international sources.Under these circumstances, it is strongly expected that (1): Japan should immediately act for resources security with firm diplomatic strategies (2): Japan should make its best efforts to achieve the world highest resource productivity (Material Intensity per Service unit = min.) for environmentally sustainable development of the world.Several suggestions to cope with resource crisis are made.
{"title":"An Era of Resource Crisis-Towards a society of high resource productivity-","authors":"Masa Taniguchi","doi":"10.2473/shigentosozai.122.564","DOIUrl":"https://doi.org/10.2473/shigentosozai.122.564","url":null,"abstract":"In 2006, the world population reached 6.5 billion and the global economy is rapidly expanding. Consequently, global use of mineral resources have become huge. Rapidly growing China's appetite has a great impact. Therefore, it is the author's big concern over the following issues for sustainability of the world.Depletion of resources, progress of the domination by international resources majors, increasing dependence on resource-rich but politically unstable developing countries, resurgence of “resource nationalism”, beginning of world wide struggle for securing resources against possible shortage, serious environmental problems caused by massive mine development, frequent conflict between mining companies and local people, and escalating market prices.Just now, it can be said an era of “Resources Crisis”. However, in today's global economy, nation's economic security depends on access to adequate mineral resource supplies from a variety of international sources.Under these circumstances, it is strongly expected that (1): Japan should immediately act for resources security with firm diplomatic strategies (2): Japan should make its best efforts to achieve the world highest resource productivity (Material Intensity per Service unit = min.) for environmentally sustainable development of the world.Several suggestions to cope with resource crisis are made.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"31 3 1","pages":"564-572"},"PeriodicalIF":0.0,"publicationDate":"2006-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81161349","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}
Hydrothermal treatments of mixtures of Beluga coal and Cryptomeria Japonica were conducted by using a slurry of 10wt% density, fed at 10 kg/h rate in the reactor of a bench-scale continuous equipment, the temperature and pressure of which were set at 300°C and 12 MPa, respectively. The reaction time was 30 minutes. It was found that, during the hydrothermal treatment, the yield of solid phase decreased and the total organic carbon (TOC) of liquid phase increased as the biomass-mixing ratio increased. That means that the biomass was more decomposable than the coal. Besides, volatile matter in the material sample showed a higher decomposability, as compared with fixed carbon, and part of the decomposed volatile matter was considered to produce new aromatic compounds and carboxylic acids through repolymerization to fixed carbon. As a consequence, the gross calorific value of the solid phase of the hydrothermally treated mixture became higher with increasing biomass-mixing ratio on a dry basis. Considering ash content, the solid phase showed negligible change in gross calorific value, independent of the mixing ratio; it was ca. 7300 kcal/kg on a dry ash-free basis. In addition, it is worth mentioning that a five-hour run using a bench-scale continuous equipment was conducted successfully.
{"title":"Production of Bio-Coal Fuel from Low Rank Coal and Woody Biomass Mixture by Using a Bench-Scale Continuous Hydrothermal Equipment","authors":"Nonaka Moriyasu, 壯泰 野中, 剛 平島, Hirajima Tsuyoshi, 亮平 柿添, Kakizoe Ryohei, 圭子 笹木, Sasaki Keiko, Tsuchiya Fujio, 土屋 富士雄, Tsurui Masao, 雅夫 鶴井","doi":"10.2473/SHIGENTOSOZAI.122.522","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.122.522","url":null,"abstract":"Hydrothermal treatments of mixtures of Beluga coal and Cryptomeria Japonica were conducted by using a slurry of 10wt% density, fed at 10 kg/h rate in the reactor of a bench-scale continuous equipment, the temperature and pressure of which were set at 300°C and 12 MPa, respectively. The reaction time was 30 minutes. It was found that, during the hydrothermal treatment, the yield of solid phase decreased and the total organic carbon (TOC) of liquid phase increased as the biomass-mixing ratio increased. That means that the biomass was more decomposable than the coal. Besides, volatile matter in the material sample showed a higher decomposability, as compared with fixed carbon, and part of the decomposed volatile matter was considered to produce new aromatic compounds and carboxylic acids through repolymerization to fixed carbon. As a consequence, the gross calorific value of the solid phase of the hydrothermally treated mixture became higher with increasing biomass-mixing ratio on a dry basis. Considering ash content, the solid phase showed negligible change in gross calorific value, independent of the mixing ratio; it was ca. 7300 kcal/kg on a dry ash-free basis. In addition, it is worth mentioning that a five-hour run using a bench-scale continuous equipment was conducted successfully.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"1 1","pages":"522-527"},"PeriodicalIF":0.0,"publicationDate":"2006-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76577926","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 : 2006-11-25DOI: 10.2473/SHIGENTOSOZAI.122.489
佐貫 須美子, 拓史 山本, 正輝 持舘
Decomposition reactions of aqueous CN- ions by TiO2 photocatalyst, ozone and/or hydrogen peroxide were investigated. The principal findings obtained are as follows:1) The presence of dissolved oxygen was necessary to decompose aqueous CN- ions photocatalytically. CN- was oxidized to CNO- with TiO2 catalyst, and then to CO32- and NO3-. Oxidation reaction of CNO- to CO32- and NO3- was far slower compared to that of CN- to CNO-. Photocatalytic oxidation reaction of CNO- at pHs 7 and 10 proceeded distinctly faster compared to that at pH 12. 2) Although ozone oxidation of CN- took the same paths as photocatalytic reactions, but it was faster than that of photocatalytic routes. Combined use of photocatalyst and ozone for the decomposition of CN- was more efficient.3) Decomposition product of CN- with hydrogen peroxide was found as CNO- and N2. Joint use of hydrogen peroxide and photocatalyst promoted reaction of CN- to N2.
{"title":"光触媒, オゾンあるいは過酸化水素によるCN^-イオン含有水溶液の分解","authors":"佐貫 須美子, 拓史 山本, 正輝 持舘","doi":"10.2473/SHIGENTOSOZAI.122.489","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.122.489","url":null,"abstract":"Decomposition reactions of aqueous CN- ions by TiO2 photocatalyst, ozone and/or hydrogen peroxide were investigated. The principal findings obtained are as follows:1) The presence of dissolved oxygen was necessary to decompose aqueous CN- ions photocatalytically. CN- was oxidized to CNO- with TiO2 catalyst, and then to CO32- and NO3-. Oxidation reaction of CNO- to CO32- and NO3- was far slower compared to that of CN- to CNO-. Photocatalytic oxidation reaction of CNO- at pHs 7 and 10 proceeded distinctly faster compared to that at pH 12. 2) Although ozone oxidation of CN- took the same paths as photocatalytic reactions, but it was faster than that of photocatalytic routes. Combined use of photocatalyst and ozone for the decomposition of CN- was more efficient.3) Decomposition product of CN- with hydrogen peroxide was found as CNO- and N2. Joint use of hydrogen peroxide and photocatalyst promoted reaction of CN- to N2.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"38 1","pages":"489-496"},"PeriodicalIF":0.0,"publicationDate":"2006-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88469412","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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