The Experts below are selected from a list of 26406 Experts worldwide ranked by ideXlab platform
Meng Li - One of the best experts on this subject based on the ideXlab platform.
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a cleaner vanadium extraction method featuring non salt roasting and ammonium bicarbonate leaching
Journal of Cleaner Production, 2017Co-Authors: Shaona Wang, Hao Du, Shili Zheng, Meng Li, David DreisingerAbstract:Abstract A cleaner method featuring non-salt roasting and ammonium bicarbonate leaching has been studied for the extraction of vanadium from vanadium slag. Compared to the traditional alkaline salt roasting followed by water leaching process, chromium spinel in the raw vanadium slag will not be converted to carcinogenic chromate salts and exhaust gas will not be produced in the non-salt roasting process. The soluble salt, NH 4 VO 3 , can be easily crystallized directly by cooling. The wastewater from vanadate precipitation can be recycled in the leaching process. The leaching residue can be comprehensively utilized in conjunction with an Iron-Making process. The oxidation mechanisms of vanadium spinel were analyzed using XRD and SEM-EDS. Additionally, the effects of leaching variables, including ammonium bicarbonate concentration, roasted vanadium slag particle size, and leaching temperature, were examined. Finally, the leaching thermodynamics and leaching kinetics have been studied.
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a cleaner vanadium extraction method featuring non salt roasting and ammonium bicarbonate leaching
Journal of Cleaner Production, 2017Co-Authors: Shaona Wang, Hao Du, Shili Zheng, Meng Li, David Dreisinger, Yi ZhangAbstract:Abstract A cleaner method featuring non-salt roasting and ammonium bicarbonate leaching has been studied for the extraction of vanadium from vanadium slag. Compared to the traditional alkaline salt roasting followed by water leaching process, chromium spinel in the raw vanadium slag will not be converted to carcinogenic chromate salts and exhaust gas will not be produced in the non-salt roasting process. The soluble salt, NH 4 VO 3 , can be easily crystallized directly by cooling. The wastewater from vanadate precipitation can be recycled in the leaching process. The leaching residue can be comprehensively utilized in conjunction with an Iron-Making process. The oxidation mechanisms of vanadium spinel were analyzed using XRD and SEM-EDS. Additionally, the effects of leaching variables, including ammonium bicarbonate concentration, roasted vanadium slag particle size, and leaching temperature, were examined. Finally, the leaching thermodynamics and leaching kinetics have been studied.
E A Ossa - One of the best experts on this subject based on the ideXlab platform.
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development of as cast dual matrix structure dms ductile Iron
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Sandra Murcia, Marco Paniagua, E A OssaAbstract:Abstract Ductile Iron is widely used due to its low cost and higher ductility than other cast Irons. There has been an increased interest during the last years in improving the strength of these materials by means of heat-treating to obtain dual matrix structures (DMS) that enhance the properties found in Austempered Ductile Irons (ADI). This work studies the fabrication of DMS ductile cast Irons with martensitic and bainitic structures in the as-cast condition, reducing costs related to heat treating processing while improving the mechanical behavior of the material. Cast Irons alloyed with nickel ranging from 0% up to 7% were produced in order to evaluate the effect of Ni–Mo content on the phase transformations and mechanical properties of the material. The effect of cooling rate in phase transformations and mechanical properties were studied using molds with different wall thicknesses, finding that addition of Nickel and Molybdenum improves substantially the strength of the as-cast ductile Iron, Making unnecessary any further heat treating according to the level of properties desired.
David Dreisinger - One of the best experts on this subject based on the ideXlab platform.
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a cleaner vanadium extraction method featuring non salt roasting and ammonium bicarbonate leaching
Journal of Cleaner Production, 2017Co-Authors: Shaona Wang, Hao Du, Shili Zheng, Meng Li, David DreisingerAbstract:Abstract A cleaner method featuring non-salt roasting and ammonium bicarbonate leaching has been studied for the extraction of vanadium from vanadium slag. Compared to the traditional alkaline salt roasting followed by water leaching process, chromium spinel in the raw vanadium slag will not be converted to carcinogenic chromate salts and exhaust gas will not be produced in the non-salt roasting process. The soluble salt, NH 4 VO 3 , can be easily crystallized directly by cooling. The wastewater from vanadate precipitation can be recycled in the leaching process. The leaching residue can be comprehensively utilized in conjunction with an Iron-Making process. The oxidation mechanisms of vanadium spinel were analyzed using XRD and SEM-EDS. Additionally, the effects of leaching variables, including ammonium bicarbonate concentration, roasted vanadium slag particle size, and leaching temperature, were examined. Finally, the leaching thermodynamics and leaching kinetics have been studied.
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a cleaner vanadium extraction method featuring non salt roasting and ammonium bicarbonate leaching
Journal of Cleaner Production, 2017Co-Authors: Shaona Wang, Hao Du, Shili Zheng, Meng Li, David Dreisinger, Yi ZhangAbstract:Abstract A cleaner method featuring non-salt roasting and ammonium bicarbonate leaching has been studied for the extraction of vanadium from vanadium slag. Compared to the traditional alkaline salt roasting followed by water leaching process, chromium spinel in the raw vanadium slag will not be converted to carcinogenic chromate salts and exhaust gas will not be produced in the non-salt roasting process. The soluble salt, NH 4 VO 3 , can be easily crystallized directly by cooling. The wastewater from vanadate precipitation can be recycled in the leaching process. The leaching residue can be comprehensively utilized in conjunction with an Iron-Making process. The oxidation mechanisms of vanadium spinel were analyzed using XRD and SEM-EDS. Additionally, the effects of leaching variables, including ammonium bicarbonate concentration, roasted vanadium slag particle size, and leaching temperature, were examined. Finally, the leaching thermodynamics and leaching kinetics have been studied.
Sandra Murcia - One of the best experts on this subject based on the ideXlab platform.
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development of as cast dual matrix structure dms ductile Iron
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Sandra Murcia, Marco Paniagua, E A OssaAbstract:Abstract Ductile Iron is widely used due to its low cost and higher ductility than other cast Irons. There has been an increased interest during the last years in improving the strength of these materials by means of heat-treating to obtain dual matrix structures (DMS) that enhance the properties found in Austempered Ductile Irons (ADI). This work studies the fabrication of DMS ductile cast Irons with martensitic and bainitic structures in the as-cast condition, reducing costs related to heat treating processing while improving the mechanical behavior of the material. Cast Irons alloyed with nickel ranging from 0% up to 7% were produced in order to evaluate the effect of Ni–Mo content on the phase transformations and mechanical properties of the material. The effect of cooling rate in phase transformations and mechanical properties were studied using molds with different wall thicknesses, finding that addition of Nickel and Molybdenum improves substantially the strength of the as-cast ductile Iron, Making unnecessary any further heat treating according to the level of properties desired.
Yi Zhang - One of the best experts on this subject based on the ideXlab platform.
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a cleaner vanadium extraction method featuring non salt roasting and ammonium bicarbonate leaching
Journal of Cleaner Production, 2017Co-Authors: Shaona Wang, Hao Du, Shili Zheng, Meng Li, David Dreisinger, Yi ZhangAbstract:Abstract A cleaner method featuring non-salt roasting and ammonium bicarbonate leaching has been studied for the extraction of vanadium from vanadium slag. Compared to the traditional alkaline salt roasting followed by water leaching process, chromium spinel in the raw vanadium slag will not be converted to carcinogenic chromate salts and exhaust gas will not be produced in the non-salt roasting process. The soluble salt, NH 4 VO 3 , can be easily crystallized directly by cooling. The wastewater from vanadate precipitation can be recycled in the leaching process. The leaching residue can be comprehensively utilized in conjunction with an Iron-Making process. The oxidation mechanisms of vanadium spinel were analyzed using XRD and SEM-EDS. Additionally, the effects of leaching variables, including ammonium bicarbonate concentration, roasted vanadium slag particle size, and leaching temperature, were examined. Finally, the leaching thermodynamics and leaching kinetics have been studied.
