三元体系Na+（Mg2+），Ca2+∥Cl--H2O 278.2 K稳定相平衡研究

doi:10.19964/j.issn.1006-4990.2023-0074

Abstract

Abstract:

Study on the multitemperature phase equilibria of water-salt system containing sodium，magnesium and calcium can provide data support for the sustainable development of salt lakes containing magnesium and calcium.Therefore，the phase equilibria of two aqueous ternary system of Na⁺，Ca²⁺∥Cl^--H₂O and Mg²⁺，Ca²⁺∥Cl^--H₂O at 278.2 K were investigated by the isothermal dissolution method，the solubility，refractive index and density of these two systems were determined，the corresponding phase diagrams were constructed based on the experimental data.The results showed that Na⁺，Ca²⁺∥Cl^--H₂O and Mg²⁺，Ca²⁺∥Cl^--H₂O were both belong to simple system without double salts or solid solution formed at 278.2 K.The crystallization regions of NaCl was much larger than CaCl₂·6H₂O in the system Na⁺，Ca²⁺∥Cl^--H₂O at 278.2 K，comparing the phase diagrams of the system at 273.2，278.2，298.2，348.2 K，it could be seen that with the increase of temperature，the crystallization area of NaCl was increased，and the crystal form of CaCl₂ was changed from CaCl₂·6H₂O to CaCl₂·2H₂O.The crystallization region of MgCl₂·6H₂O was larger than CaCl₂·6H₂O in the system Mg²⁺，Ca²⁺∥Cl^--H₂O at 278.2 K，comparing the phase diagrams of the system at 273.2，278.2，303.2，308.2，348.2，383.2 K，it was found that the double salt tachyhydrite 2MgCl₂·CaCl₂·12H₂O was formed at 303.2，308.2，348.2，383.2 K，and its crystallization region was increased with the increase of temperature.There were two double salts of 2CaCl₂·MgCl₂·6H₂O and 2MgCl₂·CaCl₂·12H₂O formed at 383.2 K.

Key words: phase equilibria, phase diagram, solubility, hydrate salt

CLC Number:

O642.42

FENG Xia, YU Xuefeng, YAO Zhihao, LUO Jun, REN Siying, ZHAO Zhixing, YU Xudong. Study on phase equilibria of aqueous ternary system of Na⁺（Mg²⁺），Ca²⁺∥Cl^--H₂O at 278.2 K[J]. Inorganic Chemicals Industry, 2024, 56(1): 47-52.

Figures/Tables 10

Table 1

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References 23

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序号	密度/ （g·cm^-3）	折射率	平衡液相组成/%		平衡固相组成/%		平衡固相
			Na⁺，Ca²⁺∥Cl^--H₂O
			w （NaCl）	w （CaCl₂）	w （NaCl）	w （CaCl₂）
1，B	1.194 1	1.381 9	26.30	0.00	—	—	NaCl
2	1.195 0	1.382 7	26.26	0.40	66.09	0.32	NaCl
3	1.204 8	1.383 9	25.03	1.79	99.67	0.25	NaCl
4	1.202 7	1.385 0	23.11	3.47	97.27	0.38	NaCl
5	1.210 5	1.389 1	20.48	7.14	94.25	1.09	NaCl
6	1.219 4	1.391 2	16.88	10.72	48.71	6.56	NaCl
7	1.221 3	1.395 2	13.99	13.75	41.03	9.50	NaCl
8	1.244 1	1.398 2	11.55	17.50	95.05	1.71	NaCl
9	1.254 8	1.404 5	8.21	20.60	63.08	8.55	NaCl
10	1.264 5	1.404 8	6.96	22.34	61.52	9.40	NaCl
11	1.264 0	1.408 6	5.70	23.72	91.35	2.98	NaCl
12	1.280 7	1.409 9	4.17	26.93	92.87	2.67	NaCl
13	1.297 2	1.415 3	2.23	29.66	73.64	7.40	NaCl
14	1.320 5	1.425 0	1.63	32.18	81.52	6.02	NaCl
15	1.333 0	1.428 2	1.25	34.16	57.44	14.88	NaCl
16	1.348 9	1.434 3	0.90	36.14	51.48	16.53	NaCl
17，E	1.371 7	1.439 8	0.76	37.66	10.44	43.11	NaCl+CaCl₂· 6H₂O
18，A	1.358 2	1.439 1	0.00	38.36	—	—	CaCl₂· 6H₂O
			Mg²⁺，Ca²⁺∥Cl^--H₂O
			w （CaCl₂）	w （MgCl₂）	w （CaCl₂）	w （MgCl₂）
1，C	1.319 3	1.430 8	0.00	34.21	—	—	MgCl₂· 6H₂O
2	1.314 8	1.432 6	2.02	33.19	1.93	35.10	MgCl₂· 6H₂O
3	1.325 0	1.433 1	4.00	31.68	3.97	34.86	MgCl₂· 6H₂O
4	1.325 0	1.434 4	6.53	29.57	4.84	34.95	MgCl₂· 6H₂O
5	1.340 7	1.436 2	8.40	28.59	7.03	34.46	MgCl₂· 6H₂O
6	1.353 6	1.438 7	11.57	25.11	3.56	41.88	MgCl₂· 6H₂O
7	1.357 1	1.439 9	13.72	23.53	1.33	46.45	MgCl₂· 6H₂O
8	1.366 6	1.443 0	20.67	18.13	8.74	34.31	MgCl₂· 6H₂O
9	1.367 1	1.443 9	22.48	16.97	16.92	26.08	MgCl₂· 6H₂O
10	1.375 5	1.445 8	24.58	15.35	10.87	34.87	MgCl₂· 6H₂O
11	1.383 2	1.447 1	27.81	13.30	20.16	23.76	MgCl₂· 6H₂O
12，F	1.398 2	1.449 0	33.75	10.26	35.76	22.66	MgCl₂· 6H₂O+CaCl₂· 6H₂O
13	1.388 2	1.447 1	34.83	4.65	40.12	3.99	CaCl₂· 6H₂O
14	1.384 1	1.440 0	35.41	2.69	46.90	1.00	CaCl₂· 6H₂O
15	1.372 1	1.440 2	36.57	1.05	46.85	0.64	CaCl₂· 6H₂O
16	1.367 2	1.440 3	38.30	0.10	42.47	0.08	CaCl₂· 6H₂O
17，D	1.366 8	1.439 2	38.32	0.00	—	—	CaCl₂· 6H₂O

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Study on phase equilibria of aqueous ternary system of Na⁺（Mg²⁺），Ca²⁺∥Cl^--H₂O at 278.2 K

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Study on phase equilibria of aqueous ternary system of Na+（Mg2+），Ca2+∥Cl--H2O at 278.2 K