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Citation: Li Han, Chen Zhichuan. A MODIFIED MATHMATICAL MODEL OF FRACTIONAL COUNTER CURRENT EXTRACTION FOR RARE EARTH SEPARATION[J]. Chinese Journal of Applied Chemistry, ;1986, 3(4): 54-57. shu

A MODIFIED MATHMATICAL MODEL OF FRACTIONAL COUNTER CURRENT EXTRACTION FOR RARE EARTH SEPARATION

Li Han ,
Chen Zhichuan

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 20 June 1985
Available Online: 19 December 1985

The model of the fractional counter current extraction (FCCE) is modified based on the study of the extraction mechanism. In this model 2n equations for the equilibrium acidity (H(I)=H₀-nX:(I)) and extractant concentration (Z(I)=Z₀-nY:(I)) are substituted into the FCCE model proposed by the authors earlier (1) and the number of the equations can be reduced from 2n (m+1) to 2nm. An improvement in the restriction and iteration for the solution is taken, making the physical meaning of the solution more accurate and thus the stability of convergence. A mathmatical simulation for HEH(EHP)-kerosene-HNO₃-(Sm-Gd)(NO₃)₃FCCE system is given and the calculated values are more fit with the experimental data than in earlier work. The influences of the extraction conditions on the separation are also discussed. It is shown that this model can be applied to computer aided design.
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