海水体系碳酸钠水合物结晶形成过程研究及应用

doi:10.19964/j.issn.1006-4990.2022-0289

Abstract

Abstract:

Concentrated seawater，a by-product of seawater desalination，contains a large number of chemical resources.Concentrated brine can be obtained by thickening and refining，which can be used as raw material for soda ash production by ammonia-alkali process.The phase equilibrium solubility data of Na₂CO₃-Na₂SO₄-NaCl-H₂O quaternary system at 0 ℃ was determined by isothermal method，and the phase diagram was drawn and analyzed.The results showed that at 0 ℃，there were 1 isothermal cosaturation point and 3 crystallization zones in the system，of which the area of Na₂CO₃·10H₂O crystallization zone was large，which could be used for the process research of sodium carbonate hydrate method to enrich seawater.The calculations of the material balance showed that the technology could concentrate desalinated seawater by 80.56%，and the concentration of NaCl was 5.14 times of the original concentrated seawater.The use of sodium carbonate hydrate method to increase the concentration of brine as raw material for soda ash production could reduce the salinization process of the original process，help to maximize the utilization of by-product concentrated seawater，and provide theoretical and data support for the efficient and comprehensive utilization of concentrated seawater.

Key words: concentrated seawater, phase equilibrium, crystal, Na₂CO₃, hydrate

CLC Number:

P746.1

GONG Xuemin, ZHANG Rongyu, LI Na, HAO Ya′nan, ZHANG Qian. Study on crystallization process of Na₂CO₃hydrate in seawater system and its application[J]. Inorganic Chemicals Industry, 2023, 55(3): 55-59.

Figures/Tables 7

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Table 1

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Table 2

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相图点	液相组成质量分数/%				液相干盐组成/%			平衡固相
相图点	NaCl	Na₂CO₃	Na₂SO₄	H₂O	NaCl	Na₂CO₃	Na₂SO₄	平衡固相
B	25.65	0.00	1.20	73.15	95.53	0.00	4.47	Nl+Ns
	24.50	1.20	1.53	72.77	89.97	4.41	5.62	Nl+Ns
	23.04	2.54	1.28	73.14	85.78	9.46	4.77	Nl+Ns
A	23.03	3.79	1.38	71.80	81.67	13.44	4.89	Nc+Ns+Nl
	13.32	3.05	1.27	82.36	75.51	17.29	7.20	Nc+Ns
	20.00	7.78	2.89	69.33	65.21	25.37	9.42	Nc+Ns
	14.13	5.99	2.32	77.57	62.98	26.69	10.33	Nc+Ns
	10.88	7.09	2.87	79.16	52.21	34.02	13.77	Nc+Ns
	4.47	4.27	1.76	89.50	42.57	40.67	16.76	Nc+Ns
	4.77	7.39	3.02	84.83	31.42	48.68	19.89	Nc+Ns
	3.53	7.97	3.13	85.37	24.13	54.48	21.39	Nc+Ns
	2.68	8.61	3.41	85.30	18.23	58.57	23.20	Nc+Ns
F	0.00	10.85	3.45	85.70	0.00	75.87	24.13	Nc+Ns
D	24.24	2.74	0.00	73.02	89.84	10.16	0.00	Nc+Nl
	23.73	3.31	0.63	72.33	85.76	11.96	2.28	Nc+Nl

项目	液相组成质量分数/%				液相干盐组成/%
项目	Na₂SO₄	NaCl	H₂O		Na₂SO₄	NaCl
京唐钢浓海水	0.25	3.06	96.69		7.55	92.45

工艺过程	体系	各组成质量分数/%				质量/ kg
工艺过程	体系	Na₂CO₃	Na₂SO₄	NaCl	H₂O	质量/ kg
增浓过程	京唐钢浓海水	0	0.25	3.06	96.69	1 000.00
	加入Na₂CO₃	100	0	0	0	483.95
	混合体系	32.61	0.17	2.06	65.16	1 483.95
	母液	3.23	1.30	15.74	79.73	194.41
	生成Na₂CO₃·10H₂O	37.04	0	0	62.96	1 289.54
Na₂CO₃·10H₂O 热分解过程	无水碳酸钠	100	0	0	0	477.65
Na₂CO₃·10H₂O 热分解过程	H₂O	0	0	0	100	811.89

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Study on crystallization process of Na₂CO₃hydrate in seawater system and its application

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