四元体系NaCl+NaBO2+Na2CO3+H2O 298.15 K 相平衡研究
收稿日期: 2021-12-29
网络出版日期: 2022-11-03
基金资助
青海省科技厅项目(2019-2J-7043)
Phase equilibria of quaternary system of NaCl+NaBO2+Na2CO3+H2O at 298.15 K
Received date: 2021-12-29
Online published: 2022-11-03
柴达木盐湖中具有丰富的盐湖离子,对其中的一个四元体系水盐相图开展研究,采用等温溶解平衡法开展了298.15 K时四元体系NaCl+NaBO2+Na2CO3+H2O相平衡研究,测定了体系平衡液相组成及密度和折光率,绘制了四元体系NaCl+NaBO2+Na2CO3+H2O 298.15 K的相图及相应的物化性质图。研究发现NaCl+NaBO2+Na2CO3+H2O四元体系298.15 K 时包含2个共饱点（E1、E2）、5条溶解度曲线（AE1、BE1、CE2、DE2、E1E2）、4个结晶区（NaCl、NaBO2·4H2O、Na2CO3·7H2O、NaCl·NaBO2·2H2O）。其中三元体系NaCl+NaBO2+H2O在298.15 K下产生了复盐NaCl·NaBO2·2H2O,通过研究发现该四元体系NaCl+NaBO2+Na2CO3+H2O在298.15 K下也具有NaCl·NaBO2·2H2O复盐区。
马玉军 , 王晓 , 李淑雅 , 张付康 , 李娟 . 四元体系NaCl+NaBO2+Na2CO3+H2O 298.15 K 相平衡研究[J]. 无机盐工业, 2022 , 54(10) : 42 -46 . DOI: 10.19964/j.issn.1006-4990.2021-0782
There were abundant ions in the salt lake of Qaidam,and the water salt phase diagram of a quaternary system was studied.The phase equilibrium of NaCl+NaBO2+Na2CO3+H2O at 298.15 K was studied by isothermal solution equilibrium method,the composition,density and refractive index of the equilibrium liquid phase of the system were measured.The phase diagram of the quaternary system of NaCl+NaBO2+Na2CO3+H2O 298.15 K and its corresponding physico-chemical properties were drawn.It was found that the system of NaCl+NaBO2+Na2CO3+H2O at 298.15 K contained two saturation points （E1,E2）,five solubility curves（AE1,BE1,CE2,DE2,E1E2）,four crystallization regions（NaCl,NaBO2·4H2O,Na2CO3·7H2O,NaCl·NaBO2·2H2O）.In the ternary system NaCl+NaBO2+H2O,double salt NaCl·NaBO2·2H2O was produced at 298.15 K.The study showed that the quaternion system of NaCl+NaBO2+Na2CO3+H2O also had NaCl·NaBO2·2H2O double salt region at 298.15 K.
Key words： phase equilibrium; quaternary system; solubility; salt lake
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