四元体系硼酸锂-硼酸钾-硼酸镁-水在308.15 K时固液相平衡研究

doi:10.11962/1006-4990.2019-0402

Abstract

Abstract:

The phase equilibrium of the quaternary system lithium borate-potassium borate-magnesium borate-water was studied at 308.15 K with isothermal solution saturation method.Solubilities,densities,refractive indices and pH of the system were determined.Stability phase diagram of this system contains one invariant point L+Li₂B₄O₇·3H₂O+K₂B₄O₇·4H₂O+Mg₂B₆O₁₁·15H₂O） which liquid compositions were as follows：w（Li₂B₄O₇）=3.11%,w（K₂B₄O₇）=16.64% and w（Mg₂B₆O₁₁）=0.10%; and three crystallization regions corresponding to Li₂B₄O₇·3H₂O,K₂B₄O₇·4H₂O and Mg₂B₆O₁₁·15H₂O,respectively. Neither double salts nor solid solutions formed in this system,and the K₂B₄O₇ and Li₂B₄O₇ in solution both had a strong salting-out effect on inderite.The solution density,refractive index and pH of the quaternary system changes regularly with the increasing of borate concentration.

Key words: solid-liquid phase equilibria, solubility, salt-water system phase diagram, inderite

CLC Number:

TQ128.54

Wang Jukui,Dong Xingfeng,Zhao Dong,Wang Shiqiang,Guo Yafei,Deng Tianlong. Solid-liquid phase equilibria in quaternary system lithium borate-potassium borate-magnesium borate-water at 308.15 K[J]. Inorganic Chemicals Industry, 2020, 52(5): 27-30.

Figures/Tables 7

References 18

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序号	液相组成w_b/%				干盐指数J_b /（g/100 g 干盐）			密度ρ/ （g·cm^-3）	折光率 n_D	pH	平衡固相
序号	Li₂B₄O₇	K₂B₄O₇	MgB₄O₇	H₂O	Li₂B₄O₇	K₂B₄O₇	H₂O	密度ρ/ （g·cm^-3）	折光率 n_D	pH	平衡固相
1,A	2.090	14.640	0.000	83.27	12.490	87.51	497.7	1.142 4	1.358 4	9.941	Li₂B₄O₇·3H₂O+K₂B₄O₇·4H₂O
2	2.122	13.580	0.011 23	84.29	13.510	86.42	536.4	1.145 8	1.359 4	9.932	Li₂B₄O₇·3H₂O+K₂B₄O₇·4H₂O
3	2.131	13.110	0.042 15	84.72	13.940	85.78	554.3	1.149 6	1.359 8	9.925	Li₂B₄O₇·3H₂O+K₂B₄O₇·4H₂O
4	2.150	12.900	0.051 27	84.90	14.240	85.42	562.2	1.152 1	1.360 1	9.882	Li₂B₄O₇·3H₂O+K₂B₄O₇·4H₂O
5,B	0.000	17.330	0.070 46	82.60	0.000	99.60	474.7	1.148 0	1.358 5	10.184	K₂B₄O₇·4H₂O+Mg₂B₆O₁₁·15H₂O
6	1.083	17.930	0.060 38	80.93	5.678	94.01	424.3	1.151 8	1.359 2	10.030	K₂B₄O₇·4H₂O+Mg₂B₆O₁₁·15H₂O
7	2.072	18.600	0.070 22	79.26	9.989	89.67	382.1	1.154 1	1.359 9	9.960	K₂B₄O₇·4H₂O+Mg₂B₆O₁₁·15H₂O
8	2.114	18.500	0.070 48	79.32	10.220	89.44	383.5	1.155 2	1.360 1	9.974	K₂B₄O₇·4H₂O+Mg₂B₆O₁₁·15H₂O
9	2.223	16.980	0.080 14	80.72	11.530	88.06	418.6	1.155 9	1.360 3	9.950	K₂B₄O₇·4H₂O+Mg₂B₆O₁₁·15H₂O
10,C	3.732	0.000	0.040 24	96.23	98.930	0.00	2 551.0	1.038 6	1.347 9	9.160	Li₂B₄O₇·4H₂O+Mg₂B₆O₁₁·15H₂O
11	4.761	2.103	0.066 15	93.07	68.700	30.35	1 343.0	1.057 3	1.349 4	9.320	Li₂B₄O₇·3H₂O+Mg₂B₆O₁₁·15H₂O
12	6.020	6.432	0.108 70	87.44	47.930	51.21	696.1	1.082 7	1.350 3	9.428	Li₂B₄O₇·3H₂O+Mg₂B₆O₁₁·15H₂O
13	5.273	7.552	0.111 20	87.07	40.760	58.38	673.0	1.091 2	1.350 5	9.460	Li₂B₄O₇·3H₂O+Mg₂B₆O₁₁·15H₂O
14	4.031	9.404	0.110 70	86.45	29.760	69.42	638.2	1.102 4	1.352 1	9.584	Li₂B₄O₇·3H₂O+Mg₂B₆O₁₁·15H₂O
15	3.414	10.250	0.103 70	86.23	24.800	74.45	626.3	1.113 6	1.353 9	9.660	Li₂B₄O₇·3H₂O+Mg₂B₆O₁₁·15H₂O
16,E	3.112	16.640	0.101 80	80.15	15.680	83.81	403.7	1.156 1	1.360 7	9.840	Li₂B₄O₇·3H₂O+K₂B₄O₇·4H₂O+Mg₂B₆O₁₁·15H₂O

温度/K	液相组成/%			平衡固相
温度/K	w（Li₂B₄O₇）	w（K₂B₄O₇）	w（MgB₄O₇）	平衡固相
273.15^[11]	1.49	10.28	0.14	Li₂B₄O₇·3H₂O+K₂B₄O₇·4H₂O+MgB₄O₇·9H₂O
288.15^[12]	1.64	10.15	0.31	Li₂B₄O₇·3H₂O+K₂B₄O₇·4H₂O+MgB₄O₇·9H₂O
308.15	3.11	16.64	0.10	Li₂B₄O₇·3H₂O+K₂B₄O₇·4H₂O+Mg₂B₆O₁₁·15H₂O

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Inorganic Acid-Base-Salt Committee of CIESC

Solid-liquid phase equilibria in quaternary system lithium borate-potassium borate-magnesium borate-water at 308.15 K

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