The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Guocheng Zhang - One of the best experts on this subject based on the ideXlab platform.
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recovery of rare earths from wet process Phosphoric Acid
Hydrometallurgy, 2010Co-Authors: Liangshi Wang, Xiaowei Huang, Dali Cui, Zhiqi Long, Guocheng ZhangAbstract:Abstract Phosphorite ores are a potential resource of rare earths (RE) as well as phosphate so the recovery of rare earths during the wet processing of Phosphoric Acid is important. This study investigates the influence of operating conditions and crystal modifiers on the leaching of RE and the solvent extraction of RE with organo-phosphorus reagents. The results indicate that lower temperature, higher concentration of Phosphoric Acid and larger liquid/solid ratio are beneficial to RE enrichment in the Phosphoric Acid. Surfactant additives which enhance the crystal growth of gypsum also enhanced RE leach recovery about 75% under optimized conditions. Studies on the solvent extraction of RE found that D2EHPA mixtures with neutral organo-phosphorus reagents were antagonistic and that Fe3+ competed strongly over RE. Higher D2EHPA concentration, larger phase ratio, lower temperature and lower Phosphoric Acid concentration increased the RE extraction efficiency. A negative enthalpy change was found indicating an exothermic extraction reaction.
Liangshi Wang - One of the best experts on this subject based on the ideXlab platform.
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Dissolution behaviors of rare earth elements in Phosphoric Acid solutions
Transactions of Nonferrous Metals Society of China, 2018Co-Authors: Longsheng Zhao, Liangshi Wang, Xiaowei Huang, Jinshi Dong, Zongyu Feng, Dali Cui, Lifeng ZhangAbstract:Abstract In order to provide practical fundamental data for rare-earth elements (REEs) recovery from Phosphoric Acid and to better understand REEs behavior during the Phosphoric Acid evaporation process, the solubilities of REEs in Phosphoric Acid with various concentrations of phosphorus at different temperatures were measured. A simple linear model between REEs solubility and Phosphoric Acid concentration is built and the experimental data are found to fit it very well (R2>0.94). Hydrogen-ion concentration is found to be the predominant factor controlling the solubility of REEs in Phosphoric Acid. In addition, the solubility of REEs in Phosphoric Acid is found to sharply decrease with increasing temperature, which can be attributed to the increase of the Gibbs energy of the REEPO4 dissolution reaction or the restraint of the disassociation of Phosphoric Acid molecules owing to the elevated temperature.
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recovery of rare earths from wet process Phosphoric Acid
Hydrometallurgy, 2010Co-Authors: Liangshi Wang, Xiaowei Huang, Dali Cui, Zhiqi Long, Guocheng ZhangAbstract:Abstract Phosphorite ores are a potential resource of rare earths (RE) as well as phosphate so the recovery of rare earths during the wet processing of Phosphoric Acid is important. This study investigates the influence of operating conditions and crystal modifiers on the leaching of RE and the solvent extraction of RE with organo-phosphorus reagents. The results indicate that lower temperature, higher concentration of Phosphoric Acid and larger liquid/solid ratio are beneficial to RE enrichment in the Phosphoric Acid. Surfactant additives which enhance the crystal growth of gypsum also enhanced RE leach recovery about 75% under optimized conditions. Studies on the solvent extraction of RE found that D2EHPA mixtures with neutral organo-phosphorus reagents were antagonistic and that Fe3+ competed strongly over RE. Higher D2EHPA concentration, larger phase ratio, lower temperature and lower Phosphoric Acid concentration increased the RE extraction efficiency. A negative enthalpy change was found indicating an exothermic extraction reaction.
Xiaowei Huang - One of the best experts on this subject based on the ideXlab platform.
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Dissolution behaviors of rare earth elements in Phosphoric Acid solutions
Transactions of Nonferrous Metals Society of China, 2018Co-Authors: Longsheng Zhao, Liangshi Wang, Xiaowei Huang, Jinshi Dong, Zongyu Feng, Dali Cui, Lifeng ZhangAbstract:Abstract In order to provide practical fundamental data for rare-earth elements (REEs) recovery from Phosphoric Acid and to better understand REEs behavior during the Phosphoric Acid evaporation process, the solubilities of REEs in Phosphoric Acid with various concentrations of phosphorus at different temperatures were measured. A simple linear model between REEs solubility and Phosphoric Acid concentration is built and the experimental data are found to fit it very well (R2>0.94). Hydrogen-ion concentration is found to be the predominant factor controlling the solubility of REEs in Phosphoric Acid. In addition, the solubility of REEs in Phosphoric Acid is found to sharply decrease with increasing temperature, which can be attributed to the increase of the Gibbs energy of the REEPO4 dissolution reaction or the restraint of the disassociation of Phosphoric Acid molecules owing to the elevated temperature.
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recovery of rare earths from wet process Phosphoric Acid
Hydrometallurgy, 2010Co-Authors: Liangshi Wang, Xiaowei Huang, Dali Cui, Zhiqi Long, Guocheng ZhangAbstract:Abstract Phosphorite ores are a potential resource of rare earths (RE) as well as phosphate so the recovery of rare earths during the wet processing of Phosphoric Acid is important. This study investigates the influence of operating conditions and crystal modifiers on the leaching of RE and the solvent extraction of RE with organo-phosphorus reagents. The results indicate that lower temperature, higher concentration of Phosphoric Acid and larger liquid/solid ratio are beneficial to RE enrichment in the Phosphoric Acid. Surfactant additives which enhance the crystal growth of gypsum also enhanced RE leach recovery about 75% under optimized conditions. Studies on the solvent extraction of RE found that D2EHPA mixtures with neutral organo-phosphorus reagents were antagonistic and that Fe3+ competed strongly over RE. Higher D2EHPA concentration, larger phase ratio, lower temperature and lower Phosphoric Acid concentration increased the RE extraction efficiency. A negative enthalpy change was found indicating an exothermic extraction reaction.
Dali Cui - One of the best experts on this subject based on the ideXlab platform.
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Dissolution behaviors of rare earth elements in Phosphoric Acid solutions
Transactions of Nonferrous Metals Society of China, 2018Co-Authors: Longsheng Zhao, Liangshi Wang, Xiaowei Huang, Jinshi Dong, Zongyu Feng, Dali Cui, Lifeng ZhangAbstract:Abstract In order to provide practical fundamental data for rare-earth elements (REEs) recovery from Phosphoric Acid and to better understand REEs behavior during the Phosphoric Acid evaporation process, the solubilities of REEs in Phosphoric Acid with various concentrations of phosphorus at different temperatures were measured. A simple linear model between REEs solubility and Phosphoric Acid concentration is built and the experimental data are found to fit it very well (R2>0.94). Hydrogen-ion concentration is found to be the predominant factor controlling the solubility of REEs in Phosphoric Acid. In addition, the solubility of REEs in Phosphoric Acid is found to sharply decrease with increasing temperature, which can be attributed to the increase of the Gibbs energy of the REEPO4 dissolution reaction or the restraint of the disassociation of Phosphoric Acid molecules owing to the elevated temperature.
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recovery of rare earths from wet process Phosphoric Acid
Hydrometallurgy, 2010Co-Authors: Liangshi Wang, Xiaowei Huang, Dali Cui, Zhiqi Long, Guocheng ZhangAbstract:Abstract Phosphorite ores are a potential resource of rare earths (RE) as well as phosphate so the recovery of rare earths during the wet processing of Phosphoric Acid is important. This study investigates the influence of operating conditions and crystal modifiers on the leaching of RE and the solvent extraction of RE with organo-phosphorus reagents. The results indicate that lower temperature, higher concentration of Phosphoric Acid and larger liquid/solid ratio are beneficial to RE enrichment in the Phosphoric Acid. Surfactant additives which enhance the crystal growth of gypsum also enhanced RE leach recovery about 75% under optimized conditions. Studies on the solvent extraction of RE found that D2EHPA mixtures with neutral organo-phosphorus reagents were antagonistic and that Fe3+ competed strongly over RE. Higher D2EHPA concentration, larger phase ratio, lower temperature and lower Phosphoric Acid concentration increased the RE extraction efficiency. A negative enthalpy change was found indicating an exothermic extraction reaction.
Zhiqi Long - One of the best experts on this subject based on the ideXlab platform.
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recovery of rare earths from wet process Phosphoric Acid
Hydrometallurgy, 2010Co-Authors: Liangshi Wang, Xiaowei Huang, Dali Cui, Zhiqi Long, Guocheng ZhangAbstract:Abstract Phosphorite ores are a potential resource of rare earths (RE) as well as phosphate so the recovery of rare earths during the wet processing of Phosphoric Acid is important. This study investigates the influence of operating conditions and crystal modifiers on the leaching of RE and the solvent extraction of RE with organo-phosphorus reagents. The results indicate that lower temperature, higher concentration of Phosphoric Acid and larger liquid/solid ratio are beneficial to RE enrichment in the Phosphoric Acid. Surfactant additives which enhance the crystal growth of gypsum also enhanced RE leach recovery about 75% under optimized conditions. Studies on the solvent extraction of RE found that D2EHPA mixtures with neutral organo-phosphorus reagents were antagonistic and that Fe3+ competed strongly over RE. Higher D2EHPA concentration, larger phase ratio, lower temperature and lower Phosphoric Acid concentration increased the RE extraction efficiency. A negative enthalpy change was found indicating an exothermic extraction reaction.
