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| STUDIES ON MATHEMATICAL SIMULATION OF RARE EARTH EXTRACTION Ⅰ. Mathematical Model for Extraction Equilibrium of TbCl_3-DyCl_3- HCl-H_2O-1 mol P204 (HDEHP, Kerosene Solution) System |
| YA Wenhou; SHEN Yunyu (General Research Institute of Non-Ferrous Metals; Ministry of Metallurgical Industry; Beijing) |
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Cite this article:
YA Wenhou; SHEN Yunyu (General Research Institute of Non-Ferrous Metals; Ministry of Metallurgical Industry; Beijing). STUDIES ON MATHEMATICAL SIMULATION OF RARE EARTH EXTRACTION Ⅰ. Mathematical Model for Extraction Equilibrium of TbCl_3-DyCl_3- HCl-H_2O-1 mol P204 (HDEHP, Kerosene Solution) System. Acta Metall Sin, 1983, 19(1): 94-100.
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Abstract Through study of the extraction equilibria of TbCl_3-DyCl_3-HCl-H_2O-1 mol P204 (HDEHP, kerosene solution) system, an empirical model Y=sum from i=0 to M sum from j=0 to N sum from k=0 to P (A_(ijk)x_A~ix_B~jx_C~k has been developed with M=N=P=2, where Y represents the rare earth concentration in the organic phase. As the mole fraction of TbCl_3, x_A=0.10—0.92, the acidity, x_B =1.1—3.4 mol·kg~(-1), and the total rare earth concentration, x_C=0.03—0.96 mol·kg~(-1), in the aqueous solution, the correlation coefficient of the model would be 0.9957, the average error would be 3.22% and the average error of the predictive value would be ±3.01%. The β_(Dy/Tb) was 2.69±0.056 as obtained from the experiments.From the results calculated by the model, the extraction equilibrium lines with the rare earth concentrations, acidities and mole fraction were drawn. Discussions were given.The TbCl_3-DyCl_3 model may be used for the stagewise calculations and for designing the corresponding extraction separation procedures.
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Received: 18 January 1983
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