Li+,Na+//Cl-,B4O72-—H2O Reciprocal Quaternary System Solubility Phase Diagrams

Abstract

Abstract: The solubilities, refraction indices and densities of saturated solution of Li⁺, Na⁺// Cl^-,B₄O₇^2- -H₂O reciprocal quaternary system at 0℃, 25℃ and 50℃ were determined by using isotherm method. Using total concentration of all the salts in solution as concentration coordinate(ordinate) the isothermal stereogram of solubility of the system was drawn. The results showed that the stable salt-pair of the system is Na₂Cl₂-Li₂B₄O₇ and that there are two isothermal invariant points, eutonic ponit E and inversion point P corresponding to the eqilbria: solution (E)(这里有图片19880411-77-1.GIF)LiCl·H₂O (at 25, 50℃) or LiCl·2H₂O (at 0℃) + NaCl + Li₂B₄O₇ · 3H₂O and solution (P) + Na₂-B₄O₇·1OH₂O(这里有图片19880411-77-1.GIF)NaCl + Li₂B₄O₇·3H₂O and the crystallization fields ofborates are much larger than those of chlorides.

Key words: Reciprocal quaternary system, Phase diagrams, Isotherm

Ma Peichao, Chen Peiheng. Li⁺,Na⁺//Cl^-,B₄O₇^2-—H₂O Reciprocal Quaternary System Solubility Phase Diagrams[J]. Chemical Research in Chinese Universities, 1988, 4(4): 77-83.

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Li⁺,Na⁺//Cl^-,B₄O₇^2-—H₂O Reciprocal Quaternary System Solubility Phase Diagrams

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