The Experts below are selected from a list of 5754 Experts worldwide ranked by ideXlab platform
Guohua Rao - One of the best experts on this subject based on the ideXlab platform.
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enhanced leaching process of a low grade weathered crust elution deposited rare earth ore with carboxymethyl Sesbania gum
Hydrometallurgy, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:Carboxymethyl modification was used to promote the performance of Sesbania gum in enhancing the leaching process of low-grade weathered crust elution-deposited rare earth ore. In order to compare the performance of unmodified Sesbania gum and carboxymethyl Sesbania gum in enhancing the leaching process, a series of leaching experiments were carried out. The experimental data was analyzed using chromatographic non-equilibrium plate theory. It was found that the carboxymethyl Sesbania gum has enhanced the leaching process more and with reduced lixiviant consumption compared to Sesbania gum. It provides a new approach to leaching this type of ore using a Green Chemistry approach. (C) 2013 Elsevier B.V. All rights reserved.
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Enhanced Leachability of a Lean Weathered Crust Elution-Deposited Rare-Earth Ore: Effects of Sesbania Gum Filter-Aid Reagent
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:The enhanced leachability of rare-earth ore from the lean weathered crust elution-deposited rare-earth ores with ammonium sulfate solution as lixiviant and Sesbania gum as a filter-aid reagent was elucidated and optimized with chromatographic plate theory. The effects of the flow rate, the concentration of lixiviant, the Sesbania gum filter-aid reagent, and the lixiviant consumption on the leaching process were examined with column elution. The results show that the Sesbania gum has a positive effect on the leaching process; the relationship between the height equivalent to a theoretical plate (HETP) and the leaching flow rate can be described by the van Deemter equation. There is an optimum flow rate in the leaching process. The optimum concentration of the Sesbania gum in lixiviant was discovered. Moreover, Sesbania gum added in lixiviant also reduces lixiviant consumption and promotes the optimum leaching flow rate. It provides a new approach to leaching the lean weathered crust elution-deposited rare-earth ores with high efficiency and low reagent consumption. The approach also can reduce the NH4 (+)-N pollution. (C) The Minerals, Metals & Materials Society and ASM International 2013
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enhanced leachability of a lean weathered crust elution deposited rare earth ore effects of Sesbania gum filter aid reagent
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:The enhanced leachability of rare-earth ore from the lean weathered crust elution-deposited rare-earth ores with ammonium sulfate solution as lixiviant and Sesbania gum as a filter-aid reagent was elucidated and optimized with chromatographic plate theory. The effects of the flow rate, the concentration of lixiviant, the Sesbania gum filter-aid reagent, and the lixiviant consumption on the leaching process were examined with column elution. The results show that the Sesbania gum has a positive effect on the leaching process; the relationship between the height equivalent to a theoretical plate (HETP) and the leaching flow rate can be described by the van Deemter equation. There is an optimum flow rate in the leaching process. The optimum concentration of the Sesbania gum in lixiviant was discovered. Moreover, Sesbania gum added in lixiviant also reduces lixiviant consumption and promotes the optimum leaching flow rate. It provides a new approach to leaching the lean weathered crust elution-deposited rare-earth ores with high efficiency and low reagent consumption. The approach also can reduce the NH4 +-N pollution.
Jun Tian - One of the best experts on this subject based on the ideXlab platform.
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enhanced leaching process of a low grade weathered crust elution deposited rare earth ore with carboxymethyl Sesbania gum
Hydrometallurgy, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:Carboxymethyl modification was used to promote the performance of Sesbania gum in enhancing the leaching process of low-grade weathered crust elution-deposited rare earth ore. In order to compare the performance of unmodified Sesbania gum and carboxymethyl Sesbania gum in enhancing the leaching process, a series of leaching experiments were carried out. The experimental data was analyzed using chromatographic non-equilibrium plate theory. It was found that the carboxymethyl Sesbania gum has enhanced the leaching process more and with reduced lixiviant consumption compared to Sesbania gum. It provides a new approach to leaching this type of ore using a Green Chemistry approach. (C) 2013 Elsevier B.V. All rights reserved.
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Enhanced Leachability of a Lean Weathered Crust Elution-Deposited Rare-Earth Ore: Effects of Sesbania Gum Filter-Aid Reagent
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:The enhanced leachability of rare-earth ore from the lean weathered crust elution-deposited rare-earth ores with ammonium sulfate solution as lixiviant and Sesbania gum as a filter-aid reagent was elucidated and optimized with chromatographic plate theory. The effects of the flow rate, the concentration of lixiviant, the Sesbania gum filter-aid reagent, and the lixiviant consumption on the leaching process were examined with column elution. The results show that the Sesbania gum has a positive effect on the leaching process; the relationship between the height equivalent to a theoretical plate (HETP) and the leaching flow rate can be described by the van Deemter equation. There is an optimum flow rate in the leaching process. The optimum concentration of the Sesbania gum in lixiviant was discovered. Moreover, Sesbania gum added in lixiviant also reduces lixiviant consumption and promotes the optimum leaching flow rate. It provides a new approach to leaching the lean weathered crust elution-deposited rare-earth ores with high efficiency and low reagent consumption. The approach also can reduce the NH4 (+)-N pollution. (C) The Minerals, Metals & Materials Society and ASM International 2013
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enhanced leachability of a lean weathered crust elution deposited rare earth ore effects of Sesbania gum filter aid reagent
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:The enhanced leachability of rare-earth ore from the lean weathered crust elution-deposited rare-earth ores with ammonium sulfate solution as lixiviant and Sesbania gum as a filter-aid reagent was elucidated and optimized with chromatographic plate theory. The effects of the flow rate, the concentration of lixiviant, the Sesbania gum filter-aid reagent, and the lixiviant consumption on the leaching process were examined with column elution. The results show that the Sesbania gum has a positive effect on the leaching process; the relationship between the height equivalent to a theoretical plate (HETP) and the leaching flow rate can be described by the van Deemter equation. There is an optimum flow rate in the leaching process. The optimum concentration of the Sesbania gum in lixiviant was discovered. Moreover, Sesbania gum added in lixiviant also reduces lixiviant consumption and promotes the optimum leaching flow rate. It provides a new approach to leaching the lean weathered crust elution-deposited rare-earth ores with high efficiency and low reagent consumption. The approach also can reduce the NH4 +-N pollution.
Bernard Dreyfus - One of the best experts on this subject based on the ideXlab platform.
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nod factors from sinorhizobium saheli and s teranga bv Sesbaniae are both arabinosylated and fucosylated a structural feature specific to Sesbania rostrata symbionts
Molecular Plant-microbe Interactions, 1997Co-Authors: Jean Lorquin, Gilles Lortet, Bernard Dreyfus, Myriam Ferro, Nathalie Mear, Jeanclaude Prome, Caroline BoivinAbstract:Sesbania spp. can establish symbiotic interactions with rhizobia from diverse taxonomical origins, including the newly described Sinorhizobium saheli and S. teranga bv. Sesbaniae, in addition to the Sesbania rostrata-specific symbiont Azorhizobium caulinodans. These different rhizobia exhibit a narrow host range, which is limited mainly to Sesbania spp. Nod factors from overproducing strains of S. saheli ORS611 were purified and their structures determined. Remarkably, the terminal reducing glucosamine of most compounds was found to bear both an arabinosyl group on C-3 and a fucosyl substitution on C-6. Other structural features are as follows: Nod factors are mainly chitopentameric compounds, N-methylated, O-carbamoylated and N-substituted either by a C18:1 or a C16:0 acyl chain at their nonreducing end. Nod factors from an overproducing strain of S. teranga bv. Sesbaniae ORS604 were found to be identical to those of S. saheli on the basis of high-pressure liquid chromatography separation and liquid seco...
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the Sesbania root symbionts sinorhizobium saheli and s teranga bv Sesbaniae can form stem nodules on Sesbania rostrata although they are less adapted to stem nodulation than azorhizobium caulinodans
Applied and Environmental Microbiology, 1997Co-Authors: Caroline Boivin, Ibrahima Ndoye, Gilles Lortet, Philippe De Lajudie, A. Ndiaye, Bernard DreyfusAbstract:Sesbania species can establish symbiotic interactions with rhizobia from two taxonomically distant genera, including the Sesbania rostrata stem-nodulating Azorhizobium sp. and Azorhizobium caulinodans and the newly described Sinorhizobium saheli and Sinorhizobium teranga bv. Sesbaniae, isolated from the roots of various Sesbania species. A collection of strains from both groups were analyzed for their symbiotic properties with different Sesbania species. S. saheli and S. teranga bv. Sesbaniae strains were found to effectively stem nodulate Sesbania rostrata, showing that stem nodulation is not restricted to Azorhizobium. Sinorhizobia and azorhizobia, however, exhibited clear differences in other aspects of symbiosis. Unlike Azorhizobium, S. teranga bv. Sesbaniae and S. saheli did not induce effective stem nodules on plants previously inoculated on the roots, although stem nodulation was arrested at different stages. For Sesbania rostrata root nodulation, Sinorhizobium appeared more sensitive than Azorhizobium to the presence of combined nitrogen. S. saheli and S. teranga bv. Sesbaniae were effective symbionts with all Sesbania species tested, while Azorhizobium strains fixed nitrogen only in symbiosis with Sesbania rostrata. In a simple screening test, S. saheli and S. teranga bv. Sesbaniae were incapable of asymbiotic nitrogenase activity. Thus, Azorhizobium can easily be distinguished from Sinorhizobium among Sesbania symbionts on the basis of symbiotic and free-living nitrogen fixation. The ability of Azorhizobium to overcome the systemic plant control appears to be a stem adaptation function. This last property, together with its host-specific symbiotic nitrogen fixation, makes Azorhizobium highly specialized for stem nodulation of the aquatic legume Sesbania rostrata.
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root nodulation of Sesbania rostrata suppresses stem nodulation by sinorhizobium teranga but not azorhizobium caulinodans
Canadian Journal of Microbiology, 1996Co-Authors: Kodjo Tomekpe, Bernard Dreyfus, Marcella HolstersAbstract:Les souches ORS571 d'Azorhizobium caulinodans ainsi que ORS51 et ORS52 de Sinorhizobium teranga sont des bacteries symbiotes de la meme plante hote, Sesbania rostrata. Dans la nature, A. caulinodans nodule de facon plus competitive les sites d'infection de la tige de Seshania rostrata. Par contre, les souches de Sinorhizobium, isolees frequemment a partir de nodules racinaires, sont rarement presentes dans les nodules de tige. Une explication a ce phenomene pourrait etre la presence abondante d'Azorhizobium a la surface des feuilles et des tiges de la plante hote. Le travail presente ici suggere d'autres facteurs possibles pouvant determiner la plus grande «specificite de tige» d'Azorhizobium. Nous avons montre que dans des conditions experimentales ou les racines ne sont pas inoculees, toutes les souches nodulent tres bien les tiges. Cependant les souches ORS51 et ORS52 sont beaucoup plus sensibles que la souche ORS571 a la suppression de la nodulation de tige par l'inoculation prealable des racines. L'introduction du gene regulateur nodD d'A. caulinodans diminue sensiblement la suppression de la nodulation de tige, probablement par augmentation de l'expression des genes nod et, par la suite, de la production de facteurs Nod. Ainsi, la plus grande infectivite de la souche ORS571 pourrait etre due a une production plus importante de facteurs Nod au niveau des sites d'infection de la tige, permettant ainsi une moins grande sensibilite a la suppression de la nodulation de tige par l'inoculation prealable des racines.
Xianping Luo - One of the best experts on this subject based on the ideXlab platform.
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enhanced leaching process of a low grade weathered crust elution deposited rare earth ore with carboxymethyl Sesbania gum
Hydrometallurgy, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:Carboxymethyl modification was used to promote the performance of Sesbania gum in enhancing the leaching process of low-grade weathered crust elution-deposited rare earth ore. In order to compare the performance of unmodified Sesbania gum and carboxymethyl Sesbania gum in enhancing the leaching process, a series of leaching experiments were carried out. The experimental data was analyzed using chromatographic non-equilibrium plate theory. It was found that the carboxymethyl Sesbania gum has enhanced the leaching process more and with reduced lixiviant consumption compared to Sesbania gum. It provides a new approach to leaching this type of ore using a Green Chemistry approach. (C) 2013 Elsevier B.V. All rights reserved.
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Enhanced Leachability of a Lean Weathered Crust Elution-Deposited Rare-Earth Ore: Effects of Sesbania Gum Filter-Aid Reagent
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:The enhanced leachability of rare-earth ore from the lean weathered crust elution-deposited rare-earth ores with ammonium sulfate solution as lixiviant and Sesbania gum as a filter-aid reagent was elucidated and optimized with chromatographic plate theory. The effects of the flow rate, the concentration of lixiviant, the Sesbania gum filter-aid reagent, and the lixiviant consumption on the leaching process were examined with column elution. The results show that the Sesbania gum has a positive effect on the leaching process; the relationship between the height equivalent to a theoretical plate (HETP) and the leaching flow rate can be described by the van Deemter equation. There is an optimum flow rate in the leaching process. The optimum concentration of the Sesbania gum in lixiviant was discovered. Moreover, Sesbania gum added in lixiviant also reduces lixiviant consumption and promotes the optimum leaching flow rate. It provides a new approach to leaching the lean weathered crust elution-deposited rare-earth ores with high efficiency and low reagent consumption. The approach also can reduce the NH4 (+)-N pollution. (C) The Minerals, Metals & Materials Society and ASM International 2013
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enhanced leachability of a lean weathered crust elution deposited rare earth ore effects of Sesbania gum filter aid reagent
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:The enhanced leachability of rare-earth ore from the lean weathered crust elution-deposited rare-earth ores with ammonium sulfate solution as lixiviant and Sesbania gum as a filter-aid reagent was elucidated and optimized with chromatographic plate theory. The effects of the flow rate, the concentration of lixiviant, the Sesbania gum filter-aid reagent, and the lixiviant consumption on the leaching process were examined with column elution. The results show that the Sesbania gum has a positive effect on the leaching process; the relationship between the height equivalent to a theoretical plate (HETP) and the leaching flow rate can be described by the van Deemter equation. There is an optimum flow rate in the leaching process. The optimum concentration of the Sesbania gum in lixiviant was discovered. Moreover, Sesbania gum added in lixiviant also reduces lixiviant consumption and promotes the optimum leaching flow rate. It provides a new approach to leaching the lean weathered crust elution-deposited rare-earth ores with high efficiency and low reagent consumption. The approach also can reduce the NH4 +-N pollution.
Ji Chen - One of the best experts on this subject based on the ideXlab platform.
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enhanced leaching process of a low grade weathered crust elution deposited rare earth ore with carboxymethyl Sesbania gum
Hydrometallurgy, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:Carboxymethyl modification was used to promote the performance of Sesbania gum in enhancing the leaching process of low-grade weathered crust elution-deposited rare earth ore. In order to compare the performance of unmodified Sesbania gum and carboxymethyl Sesbania gum in enhancing the leaching process, a series of leaching experiments were carried out. The experimental data was analyzed using chromatographic non-equilibrium plate theory. It was found that the carboxymethyl Sesbania gum has enhanced the leaching process more and with reduced lixiviant consumption compared to Sesbania gum. It provides a new approach to leaching this type of ore using a Green Chemistry approach. (C) 2013 Elsevier B.V. All rights reserved.
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Enhanced Leachability of a Lean Weathered Crust Elution-Deposited Rare-Earth Ore: Effects of Sesbania Gum Filter-Aid Reagent
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:The enhanced leachability of rare-earth ore from the lean weathered crust elution-deposited rare-earth ores with ammonium sulfate solution as lixiviant and Sesbania gum as a filter-aid reagent was elucidated and optimized with chromatographic plate theory. The effects of the flow rate, the concentration of lixiviant, the Sesbania gum filter-aid reagent, and the lixiviant consumption on the leaching process were examined with column elution. The results show that the Sesbania gum has a positive effect on the leaching process; the relationship between the height equivalent to a theoretical plate (HETP) and the leaching flow rate can be described by the van Deemter equation. There is an optimum flow rate in the leaching process. The optimum concentration of the Sesbania gum in lixiviant was discovered. Moreover, Sesbania gum added in lixiviant also reduces lixiviant consumption and promotes the optimum leaching flow rate. It provides a new approach to leaching the lean weathered crust elution-deposited rare-earth ores with high efficiency and low reagent consumption. The approach also can reduce the NH4 (+)-N pollution. (C) The Minerals, Metals & Materials Society and ASM International 2013
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enhanced leachability of a lean weathered crust elution deposited rare earth ore effects of Sesbania gum filter aid reagent
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2013Co-Authors: Jun Tian, Xuekun Tang, Jingqun Yin, Ji Chen, Xianping Luo, Guohua RaoAbstract:The enhanced leachability of rare-earth ore from the lean weathered crust elution-deposited rare-earth ores with ammonium sulfate solution as lixiviant and Sesbania gum as a filter-aid reagent was elucidated and optimized with chromatographic plate theory. The effects of the flow rate, the concentration of lixiviant, the Sesbania gum filter-aid reagent, and the lixiviant consumption on the leaching process were examined with column elution. The results show that the Sesbania gum has a positive effect on the leaching process; the relationship between the height equivalent to a theoretical plate (HETP) and the leaching flow rate can be described by the van Deemter equation. There is an optimum flow rate in the leaching process. The optimum concentration of the Sesbania gum in lixiviant was discovered. Moreover, Sesbania gum added in lixiviant also reduces lixiviant consumption and promotes the optimum leaching flow rate. It provides a new approach to leaching the lean weathered crust elution-deposited rare-earth ores with high efficiency and low reagent consumption. The approach also can reduce the NH4 +-N pollution.
