在已建立的TbCl_3-DyCl_3-HCl-H_2O-1mol P204煤油体系萃取平衡多项式模型的基础上,研究了分馏萃取静态特性的数学模拟。借助于建立的目标函数,用此法选择了分离Tb的最优工艺,并进行了试验验证。数学模拟与试验模拟结果相比较,相对误差是:Tb,Dy纯度<1.6％,收率<4.5％。
A study was made of the mathematical simulation of the steady state feature of the fractional extraction on the basis of the established extraction equilibria model of TbCl_3-DyCl_3-HCl-H_2O-1 mol P 204 (HDEHP, kerosene solution) system. A BASIC program has been written for calculating the solute concentrations in phases in different stages under given conditions of fractional extraction by iteration method. The optimization process of Tbseparation was selected with the aid of established objective function by direct Seeking method. The mathematical simulation was verified by comparison with experimental one. The relative error of the purity for Tb or Dy<1.6% and of recovery<4.5%. Thus, a mathematical simulation method of modelling the extraction equilibria, simulating the steady state feature of fractional extraction and selecting the optimization process may be available for the extraction separation of any binary metal.
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