Effect of Temperature on Segregation Coefficients of Impurities in Phosphorus

doi:10.1016/S1004-9541(14)60044-6

Abstract

Abstract: The present work is focused on the relationship between effective segregation coefficient k_eff and temperature of melting zone for purification of phosphorus by zone melting method. Values of k_eff at four temperatures of melting zone are obtained for zone pass n =1 at travel velocity of molten zone v =5×10^-3 m·h^-1 and initial impurity concentration C₀≤10 μg·g^-1. lnk_eff is a linear function of 1/T. The k_eff values of Al, Ca, Cr, Fe, Cd and Sb increase with temperatures while that of Mg is almost constant. The purification is acceptable at lower temperature of melting zone such as 323 K. The variations of enthalpy and entropy between impurities and phosphorus in the liquid and solid phases are also presented.

Key words: phosphorus, purity, temperature, effective segregation coefficient, zone melting

摘要： The present work is focused on the relationship between effective segregation coefficient k_eff and temperature of melting zone for purification of phosphorus by zone melting method. Values of k_eff at four temperatures of melting zone are obtained for zone pass n =1 at travel velocity of molten zone v =5×10^-3 m·h^-1 and initial impurity concentration C₀≤10 μg·g^-1. lnk_eff is a linear function of 1/T. The k_eff values of Al, Ca, Cr, Fe, Cd and Sb increase with temperatures while that of Mg is almost constant. The purification is acceptable at lower temperature of melting zone such as 323 K. The variations of enthalpy and entropy between impurities and phosphorus in the liquid and solid phases are also presented.

关键词: phosphorus, purity, temperature, effective segregation coefficient, zone melting

LIU Xuefeng, LI Jun, LUO Jianhong, ZHOU Kun, YANG Zhaopeng. Effect of Temperature on Segregation Coefficients of Impurities in Phosphorus[J]. Chin.J.Chem.Eng., 2014, 22(3): 294-298.

刘雪峰, 李军, 罗建洪, 周堃, 杨兆鹏. Effect of Temperature on Segregation Coefficients of Impurities in Phosphorus[J]. Chinese Journal of Chemical Engineering, 2014, 22(3): 294-298.

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