Ferrihydrite and green rust (GR) have been identified as promising removing agents for chro mate. However, while ferrihydrite efficiency is the still too low for practical applications, it is not known whether GR is stable in real wastewater systems. In this work, we investigated the removal of chromate from a real tannery wastewater by using sulfate-GR and ferrihydrite. We studied the effect of pH and Cr/Fe molar ratios on removal performances and elucidated the removal mechanism by XRD analysis. We performed removal experiments from simple chromate-bearing solutions under non-oxidizing Ar atmosphere, and from complex solution under open air atmosphere.
{"title":"Removal of chromate from tannery wastewater: the applicability of sulfate-green rust in real coprecipitation processes","authors":"A. Mamun, M. M. Khin, G. Granata, C. Tokoro","doi":"10.4144/RPSJ.65.67","DOIUrl":"https://doi.org/10.4144/RPSJ.65.67","url":null,"abstract":"Ferrihydrite and green rust (GR) have been identified as promising removing agents for chro mate. However, while ferrihydrite efficiency is the still too low for practical applications, it is not known whether GR is stable in real wastewater systems. In this work, we investigated the removal of chromate from a real tannery wastewater by using sulfate-GR and ferrihydrite. We studied the effect of pH and Cr/Fe molar ratios on removal performances and elucidated the removal mechanism by XRD analysis. We performed removal experiments from simple chromate-bearing solutions under non-oxidizing Ar atmosphere, and from complex solution under open air atmosphere.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80897052","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}
Several metallic materials have been developed for many purposes by alloying and controlling microstructure. From the viewpoint of materials recycling, several properties should be controlled by the latter in simple alloys. The pur- pose of this work was to establish a method for evaluating microstructure in metallic materials by a precise measurement of electrical resistivity. Electrical resistivities at 77 K and 300 K were measured by a direct current four-point method in commercially purity titanium plates after tensile deformations. The resistivities basically increased by the deformations. The Matthiessen’s plot shows good linearity. Microstructure might be potentially evaluated by this method.
{"title":"Evaluation of Microstructure by Precise Measurement of Resistivity in Pure Ti","authors":"M. Ueda, T. Sakamoto, M. Ikeda","doi":"10.4144/RPSJ.65.74","DOIUrl":"https://doi.org/10.4144/RPSJ.65.74","url":null,"abstract":"Several metallic materials have been developed for many purposes by alloying and controlling microstructure. From the viewpoint of materials recycling, several properties should be controlled by the latter in simple alloys. The pur- pose of this work was to establish a method for evaluating microstructure in metallic materials by a precise measurement of electrical resistivity. Electrical resistivities at 77 K and 300 K were measured by a direct current four-point method in commercially purity titanium plates after tensile deformations. The resistivities basically increased by the deformations. The Matthiessen’s plot shows good linearity. Microstructure might be potentially evaluated by this method.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84606733","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}
Makoto Kasai, Y. Kobayashi, Mitsunori Kondo, M. Kamitani, Masakazu Togo, A. Nakahira
Perlite is an amorphous aluminum silicate, mainly composed of SiO2 and Al2O3. In this study, we tried to synthesize LTA type zeolite from a perlite as a starting material. It was found that the mechano-chemical treatment (milling process) for perlite as a raw material resulted in the activation of its surface. As a result, fine LTA-type zeolites were preferentially synthesized for perlite with surface activated by mechano-chemical treatments.
{"title":"Synthesis and Evaluation of LTA Type Zeolite from Waste Perlite","authors":"Makoto Kasai, Y. Kobayashi, Mitsunori Kondo, M. Kamitani, Masakazu Togo, A. Nakahira","doi":"10.4144/RPSJ.64.69","DOIUrl":"https://doi.org/10.4144/RPSJ.64.69","url":null,"abstract":"Perlite is an amorphous aluminum silicate, mainly composed of SiO2 and Al2O3. In this study, we tried to synthesize LTA type zeolite from a perlite as a starting material. It was found that the mechano-chemical treatment (milling process) for perlite as a raw material resulted in the activation of its surface. As a result, fine LTA-type zeolites were preferentially synthesized for perlite with surface activated by mechano-chemical treatments.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90684544","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}
Baisui Han, B. Altansukh, Kazutoshi Haga, Y. Takasaki, A. Shibayama
In this paper, we present the results for recovery of copper from silicate-containing low-grade copper ore using flotation followed by atmospheric and high-pressure oxidative leaching. The effects of various flotation parameters, such as flotation time, PAX dosage, slurry pH and air injection rate on beneficiation of copper from the low-grade copper ore were studied. The recovery of copper reached 93.1% and the grade of copper improved to 18.2 mass% from 0.4 mass% under collector-less optimum flotation conditions. The enrichment ratio of copper in the concentrate was 45. The copper concentrate obtained from flotation of the low-grade copper ore was treated by atmospheric leaching and high-pressure oxidative leaching processes. A maximum recovery (>93.0%) of copper was obtained by high-pressure oxidative leaching in the water, whereas the copper recovery was lower than 12% in the sulfuric acid solution under atmospheric leaching conditions. The copper concentration in a pregnant leach solution enriched up to 15.0 g/L under the optimized leaching conditions. The effect of impurity such as iron in the sample on the froth flotation and both leaching processes is also considered. A process flow for the recovery of copper from silicate-containing low-grade copper ores is proposed as a result of these studies.
{"title":"Copper Recovery from Silicate-Containing Low-Grade Copper Ore Using Flotation Followed by High-Pressure Oxidative Leaching","authors":"Baisui Han, B. Altansukh, Kazutoshi Haga, Y. Takasaki, A. Shibayama","doi":"10.4144/RPSJ.64.3","DOIUrl":"https://doi.org/10.4144/RPSJ.64.3","url":null,"abstract":"In this paper, we present the results for recovery of copper from silicate-containing low-grade copper ore using flotation followed by atmospheric and high-pressure oxidative leaching. The effects of various flotation parameters, such as flotation time, PAX dosage, slurry pH and air injection rate on beneficiation of copper from the low-grade copper ore were studied. The recovery of copper reached 93.1% and the grade of copper improved to 18.2 mass% from 0.4 mass% under collector-less optimum flotation conditions. The enrichment ratio of copper in the concentrate was 45. The copper concentrate obtained from flotation of the low-grade copper ore was treated by atmospheric leaching and high-pressure oxidative leaching processes. A maximum recovery (>93.0%) of copper was obtained by high-pressure oxidative leaching in the water, whereas the copper recovery was lower than 12% in the sulfuric acid solution under atmospheric leaching conditions. The copper concentration in a pregnant leach solution enriched up to 15.0 g/L under the optimized leaching conditions. The effect of impurity such as iron in the sample on the froth flotation and both leaching processes is also considered. A process flow for the recovery of copper from silicate-containing low-grade copper ores is proposed as a result of these studies.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77434832","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}
In this study, we examined the effect of carbon black on the sulfuric acid leaching of a copper ore containing 1.1% Cu occurring as CuFeS2 (chalcopyrite). Leaching experiments were performed in Erlenmeyer flasks containing 200 mL of the sulfuric acid medium while agitated with a magnetic stirrer at 50°C. The addition of carbon black enhanced the kinetics of chalcopyrite leaching at an initial pH of 1.2. The extraction yield of Cu was 97% in 98 h in the presence of 0.2 g of carbon black, compared with 18% in the absence of carbon black. The acceleration of chalcopyrite dissolution did not occur without direct contact between the ore and the carbon black, suggesting that a galvanic interaction between the two materials plays a role in the improvement of the leaching rate. In the presence of carbon black, the redox potential fell below 600 mV vs. SHE with a decrease in the ratio of Fe(III) to Fe(II), and the leaching rate of chalcopyrite increased markedly. The enhanced kinetics of chalcopyrite leaching in the copper ore could be attributed to dissolution reactions at a low redox potential and to the galvanic interaction between the chalcopyrite and the carbon black.
{"title":"Effect of Carbon Black on Copper Ore Leaching in Sulfuric Acid Media at 50°C","authors":"H. Nakazawa, Hidekazu Yamamoto","doi":"10.4144/RPSJ.64.90","DOIUrl":"https://doi.org/10.4144/RPSJ.64.90","url":null,"abstract":"In this study, we examined the effect of carbon black on the sulfuric acid leaching of a copper ore containing 1.1% Cu occurring as CuFeS2 (chalcopyrite). Leaching experiments were performed in Erlenmeyer flasks containing 200 mL of the sulfuric acid medium while agitated with a magnetic stirrer at 50°C. The addition of carbon black enhanced the kinetics of chalcopyrite leaching at an initial pH of 1.2. The extraction yield of Cu was 97% in 98 h in the presence of 0.2 g of carbon black, compared with 18% in the absence of carbon black. The acceleration of chalcopyrite dissolution did not occur without direct contact between the ore and the carbon black, suggesting that a galvanic interaction between the two materials plays a role in the improvement of the leaching rate. In the presence of carbon black, the redox potential fell below 600 mV vs. SHE with a decrease in the ratio of Fe(III) to Fe(II), and the leaching rate of chalcopyrite increased markedly. The enhanced kinetics of chalcopyrite leaching in the copper ore could be attributed to dissolution reactions at a low redox potential and to the galvanic interaction between the chalcopyrite and the carbon black.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83562561","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}
We synthesized hydroxyapatite (HAp) by the sol-gel method based on reaction of phosphoric acid and the calcium acetate obtained by dissolving scallop shells in acetic acid. The synthesized HAp was the crystal that is flat and elliptical shape (50–100 nm). On the other hand, HAp from the commercial calcium acetate is large crystal of irregular shape. Mg2+, K+ and Na+ ions were contained in HAp from scallop shell. Effective utilization of waste scallop shell as a high value-added product such as adsorbent or artificial biomaterial can be expected.
{"title":"Shape Specificity of Crystal of Hydroxyapatite Synthesized by Sol-Gel Method from Scallop Shell","authors":"J. Kobayashi, Kelvin Ng Wijaya","doi":"10.4144/RPSJ.64.75","DOIUrl":"https://doi.org/10.4144/RPSJ.64.75","url":null,"abstract":"We synthesized hydroxyapatite (HAp) by the sol-gel method based on reaction of phosphoric acid and the calcium acetate obtained by dissolving scallop shells in acetic acid. The synthesized HAp was the crystal that is flat and elliptical shape (50–100 nm). On the other hand, HAp from the commercial calcium acetate is large crystal of irregular shape. Mg2+, K+ and Na+ ions were contained in HAp from scallop shell. Effective utilization of waste scallop shell as a high value-added product such as adsorbent or artificial biomaterial can be expected.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74489712","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}
Naoya Kaneko, M. Ohno, Tasuma Suzuki, Masakazu Niinae
Spent hydrodesulphurization (HDS) catalysts are treated with hydrometallurgical leaching processes such as caustic leaching and acid leaching with roasting as a pre-treatment step. In the alkaline leaching processes such as sodium carbonate roasting followed by water leaching, most of the molybdenum and vanadium are selectively leached and most of nickel is left in the residue after the alkaline leaching of spent HDS catalysts. Therefore, it is important to recover nickel from the alkaline leaching residue. The main form of nickel in the alkaline leaching residue is spinel, therefore, it is difficult to extract nickel from the residue using mineral acids. In the present study, the effect of grinding conditions on the leaching efficiency of nickel and aluminum from the oxidative roasted alkaline leaching residue was investigated. The dry and wet grinding, grinding speed, grinding time and the amount of roasted product in grinding significantly affected the leaching efficiency of nickel and aluminum. The leaching efficiency of nickel and aluminum from dry ground roasted product was high compared with wet ground roasted product. And also, the leaching efficiency of nickel and aluminum was low in the low amount of the roasted product fed in dry grinding and high grinding speed, because the particles were aggregated again.
{"title":"Effect of Grinding on Sulfuric Acid Leaching Efficiency of Nickel and Aluminum from Oxidative Roasted Alkaline Leaching Residue of Spent Hydrodesulphurization Catalysts","authors":"Naoya Kaneko, M. Ohno, Tasuma Suzuki, Masakazu Niinae","doi":"10.4144/RPSJ.64.85","DOIUrl":"https://doi.org/10.4144/RPSJ.64.85","url":null,"abstract":"Spent hydrodesulphurization (HDS) catalysts are treated with hydrometallurgical leaching processes such as caustic leaching and acid leaching with roasting as a pre-treatment step. In the alkaline leaching processes such as sodium carbonate roasting followed by water leaching, most of the molybdenum and vanadium are selectively leached and most of nickel is left in the residue after the alkaline leaching of spent HDS catalysts. Therefore, it is important to recover nickel from the alkaline leaching residue. The main form of nickel in the alkaline leaching residue is spinel, therefore, it is difficult to extract nickel from the residue using mineral acids. In the present study, the effect of grinding conditions on the leaching efficiency of nickel and aluminum from the oxidative roasted alkaline leaching residue was investigated. The dry and wet grinding, grinding speed, grinding time and the amount of roasted product in grinding significantly affected the leaching efficiency of nickel and aluminum. The leaching efficiency of nickel and aluminum from dry ground roasted product was high compared with wet ground roasted product. And also, the leaching efficiency of nickel and aluminum was low in the low amount of the roasted product fed in dry grinding and high grinding speed, because the particles were aggregated again.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76430582","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}
It is well known that galvanic interaction between sulfide minerals and manganese oxides in manganese nodules accelerates the leaching of sulfide minerals. Zinc-carbon batteries contain a moist paste (hereafter, black paste) of manganese oxides and graphite powder as cathode mix. We have investigated the feasibility of galvanic leaching of chalcopyrite using chemical reagent MnO 2 and black paste. Addition of MnO 2 enhanced the leaching of chalcopyrite in sulfuric acid media with pH 1.0 and Mn concentration also increased remarkably. Extraction yields of Cu and Mn were 52% and 23% respectively at a MnO 2 to chalcopyrite mass ratio of 4 in 24 days. In the presence of black paste the kinetics of chalcopyrite leaching was accelerated dramatically and 83% of Cu in the concentrate was extracted in 40 hours. The graphite powder contained in black paste could play an important role in the galvanic leaching of chalcopyrite in the presence of MnO 2 .
{"title":"Galvanic Leaching of Chalcopyrite Using Manganese Oxides in Spent Zinc-Carbon Batteries","authors":"H. Nakazawa, Wataru Hareyama","doi":"10.4144/RPSJ.63.3","DOIUrl":"https://doi.org/10.4144/RPSJ.63.3","url":null,"abstract":"It is well known that galvanic interaction between sulfide minerals and manganese oxides in manganese nodules accelerates the leaching of sulfide minerals. Zinc-carbon batteries contain a moist paste (hereafter, black paste) of manganese oxides and graphite powder as cathode mix. We have investigated the feasibility of galvanic leaching of chalcopyrite using chemical reagent MnO 2 and black paste. Addition of MnO 2 enhanced the leaching of chalcopyrite in sulfuric acid media with pH 1.0 and Mn concentration also increased remarkably. Extraction yields of Cu and Mn were 52% and 23% respectively at a MnO 2 to chalcopyrite mass ratio of 4 in 24 days. In the presence of black paste the kinetics of chalcopyrite leaching was accelerated dramatically and 83% of Cu in the concentrate was extracted in 40 hours. The graphite powder contained in black paste could play an important role in the galvanic leaching of chalcopyrite in the presence of MnO 2 .","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74755048","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. Manabe, Naoya Kaneko, Tasuma Suzuki, Masakazu Niinae
Spent hydrodesulphurization (HDS) catalysts are treated with hydrometallurgical leaching processes such as caus tic leaching and acid leaching with roasting as a pre-treatment step. In the alkaline leaching processes such as sodium carbonate roasting followed by water leaching, most of the molybdenum and vanadium are selectively leached and most of nickel is left in the residue after the alkaline leaching of spent HDS catalysts. Therefore, it is important to re cover nickel from the residue. The main form of nickel in the residue is spinel, therefore, it is difficult to extract nickel from the residue using mineral acids. In the present study, the effect of oxidative roasting and grinding conditions on the leaching efficiency of nickel and aluminum from the residue after sodium carbonate roasting followed by water leaching of spent HDS catalysts with sulfuric acid was investigated. The roasting temperature, grinding speed, grinding time and the amount of residue in grinding significantly affected the leaching efficiency of nickel and aluminum. The extraction of aluminum from roast ed residue was low compared with unroasted residue. And also, the extraction of aluminum was low in the low amount of the roasted residue fed in grinding, because the particles were aggregated again. Meanwhile, the extraction of nickel was not affected significantly by the oxidative roasting. Then, the extraction of nickel was not affected by the reaggre - gation of particles under the conditions below 650 rpm of grinding speed and 180 min of grinding time. Therefore, the possibility of preferential leaching of nickel from aluminum was suggested.
{"title":"Effect of Oxidative Roasting and Grinding on Sulfuric Acid Leaching Efficiency of Nickel and Aluminum from Alkaline Leaching Residue of Spent Hydrodesulphurization Catalysts","authors":"K. Manabe, Naoya Kaneko, Tasuma Suzuki, Masakazu Niinae","doi":"10.4144/RPSJ.63.93","DOIUrl":"https://doi.org/10.4144/RPSJ.63.93","url":null,"abstract":"Spent hydrodesulphurization (HDS) catalysts are treated with hydrometallurgical leaching processes such as caus tic leaching and acid leaching with roasting as a pre-treatment step. In the alkaline leaching processes such as sodium carbonate roasting followed by water leaching, most of the molybdenum and vanadium are selectively leached and most of nickel is left in the residue after the alkaline leaching of spent HDS catalysts. Therefore, it is important to re cover nickel from the residue. The main form of nickel in the residue is spinel, therefore, it is difficult to extract nickel from the residue using mineral acids. In the present study, the effect of oxidative roasting and grinding conditions on the leaching efficiency of nickel and aluminum from the residue after sodium carbonate roasting followed by water leaching of spent HDS catalysts with sulfuric acid was investigated. The roasting temperature, grinding speed, grinding time and the amount of residue in grinding significantly affected the leaching efficiency of nickel and aluminum. The extraction of aluminum from roast ed residue was low compared with unroasted residue. And also, the extraction of aluminum was low in the low amount of the roasted residue fed in grinding, because the particles were aggregated again. Meanwhile, the extraction of nickel was not affected significantly by the oxidative roasting. Then, the extraction of nickel was not affected by the reaggre - gation of particles under the conditions below 650 rpm of grinding speed and 180 min of grinding time. Therefore, the possibility of preferential leaching of nickel from aluminum was suggested.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85573384","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}
Toshiyuki Tanaka, Ryo Tsukane, T. Matsuda, M. Imaoka, Hiroyasu Tamai
Feasibility of a renewable sorbent for phosphorus was determined by testing the anion-exchange ability of hydrotalcite, which holds formate ions in its interlayer. The formate hydrotalcite, successfully prepared by reacting raw hydrotalcite with a formic acid/1-propanol solution, exhibited high performance for phosphorus removal and collection based on a stoichiometric anion-exchange principle. It was estimated that the collected orthophosphate ions existed as poly-anion forms of HPO4 2– and PO4 3– with a ratio of 67.6:32.4 in the interlayer after the sorption. The formate hydrotalcite is also able to revert to the starting hydrotalcite after the sorption, when treated with Na2CO3 aqueous solution, demonstrating that it can be an attractive alternative to the conventional chloride or nitrate hydrotalcite as an anion exchanger.
{"title":"A Novel Anion Exchanger Composed of Formate Hydrotalcite for Sorptive Recovery of Phosphorus","authors":"Toshiyuki Tanaka, Ryo Tsukane, T. Matsuda, M. Imaoka, Hiroyasu Tamai","doi":"10.4144/RPSJ.63.99","DOIUrl":"https://doi.org/10.4144/RPSJ.63.99","url":null,"abstract":"Feasibility of a renewable sorbent for phosphorus was determined by testing the anion-exchange ability of hydrotalcite, which holds formate ions in its interlayer. The formate hydrotalcite, successfully prepared by reacting raw hydrotalcite with a formic acid/1-propanol solution, exhibited high performance for phosphorus removal and collection based on a stoichiometric anion-exchange principle. It was estimated that the collected orthophosphate ions existed as poly-anion forms of HPO4 2– and PO4 3– with a ratio of 67.6:32.4 in the interlayer after the sorption. The formate hydrotalcite is also able to revert to the starting hydrotalcite after the sorption, when treated with Na2CO3 aqueous solution, demonstrating that it can be an attractive alternative to the conventional chloride or nitrate hydrotalcite as an anion exchanger.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87049081","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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