A novel ionic sieve with high selectivity and acid resistance to remove Nd 3+ in aqueous liquid was prepared, in which zirconium phosphate is used to be the substrate. The mechanism of selective separation on the surf...A novel ionic sieve with high selectivity and acid resistance to remove Nd 3+ in aqueous liquid was prepared, in which zirconium phosphate is used to be the substrate. The mechanism of selective separation on the surface of ionic sieve of removal of neodymium(Nd-IS) was explored by analyzing fourier transformation infrared spectra (FTIR), X-ray diffraction (XRD) and the results of selective experiment. The investigation suggests that Nd 3+ was introduced into the substrate and the reactions occurred in solid phase by thermodynamic recrystallization, then the Nd 3+ was extracted from the substrate by keeping its microstructures unchanged, which provides Nd 3+ cavities with special selectivity to adsorb Nd 3+. The ionic sieve has a special binding formed by chemical modification to capture Nd 3+. The ionic sieve is applied to removal of neodymium from strong acid condition and it is shown that it possesses a special selectivity for Nd 3+ in the aqueous, which provides a new way to extract and reclaim the radioactive americium in the High Level Liquid Radioactive Waste with an excellent selectivity.展开更多
The（submicron＋micron） bimodal size Si Cp-reinforced Mg matrix composite was compressed at the temperature of 270–420 °C and strain rate of 0.001–1 s^-1. Then, dynamic recrystallization（DRX） behavior of the...The（submicron＋micron） bimodal size Si Cp-reinforced Mg matrix composite was compressed at the temperature of 270–420 °C and strain rate of 0.001–1 s^-1. Then, dynamic recrystallization（DRX） behavior of the composite was investigated by thermodynamic method and verified by microstructure analysis. Results illustrated that the composite possess the lower critical strain and higher DRX ratio as compared to monolithic Mg alloys during hot deformation process. The predicted DRX ratio increased with the proceeding of compression, which was well consistent with the experimental value. Results from thermodynamic calculation suggested that the occurrence of DRX could be promoted by Si Cp, which would be further proved by microstructure analysis. Formation of particle deformation zone around micron Si Cp played a significant role in promoting DRX nucleation. Nevertheless, the distribution of submicron Si Cp was increasingly uniform with the proceeding of compression, which could fully restrain grain growth. Therefore, the corporate effects of micron and submicron Si Cp on DRX contributed to the improvement of DRXed ratio and the refinement of grain size for the composite during compression process.展开更多
文摘A novel ionic sieve with high selectivity and acid resistance to remove Nd 3+ in aqueous liquid was prepared, in which zirconium phosphate is used to be the substrate. The mechanism of selective separation on the surface of ionic sieve of removal of neodymium(Nd-IS) was explored by analyzing fourier transformation infrared spectra (FTIR), X-ray diffraction (XRD) and the results of selective experiment. The investigation suggests that Nd 3+ was introduced into the substrate and the reactions occurred in solid phase by thermodynamic recrystallization, then the Nd 3+ was extracted from the substrate by keeping its microstructures unchanged, which provides Nd 3+ cavities with special selectivity to adsorb Nd 3+. The ionic sieve has a special binding formed by chemical modification to capture Nd 3+. The ionic sieve is applied to removal of neodymium from strong acid condition and it is shown that it possesses a special selectivity for Nd 3+ in the aqueous, which provides a new way to extract and reclaim the radioactive americium in the High Level Liquid Radioactive Waste with an excellent selectivity.
基金supported by the National Natural Science Foundation of China (Nos. 51201112, 51274149 and 51474152)the Natural Science Foundation of Shanxi (No. 2013021013-3)the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20121402120004)
文摘The（submicron＋micron） bimodal size Si Cp-reinforced Mg matrix composite was compressed at the temperature of 270–420 °C and strain rate of 0.001–1 s^-1. Then, dynamic recrystallization（DRX） behavior of the composite was investigated by thermodynamic method and verified by microstructure analysis. Results illustrated that the composite possess the lower critical strain and higher DRX ratio as compared to monolithic Mg alloys during hot deformation process. The predicted DRX ratio increased with the proceeding of compression, which was well consistent with the experimental value. Results from thermodynamic calculation suggested that the occurrence of DRX could be promoted by Si Cp, which would be further proved by microstructure analysis. Formation of particle deformation zone around micron Si Cp played a significant role in promoting DRX nucleation. Nevertheless, the distribution of submicron Si Cp was increasingly uniform with the proceeding of compression, which could fully restrain grain growth. Therefore, the corporate effects of micron and submicron Si Cp on DRX contributed to the improvement of DRXed ratio and the refinement of grain size for the composite during compression process.
