纯度对60%NaNO3-40%KNO3二元熔盐热物性的影响

doi:10.19964/j.issn.1006-4990.2022-0535

Abstract

Abstract:

The high purity and industrial grade 60%NaNO₃-40%KNO₃（binary molten salt） were prepared by high temperature solid state method.Long time thermal cycling of 60%NaNO₃-40%KNO₃（binary molten salt） was measured by thermogravimetric method.It was shown that the weight loss of high purity binary molten salt was far less than industrial grade.The decomposition mechanism of binary molten salt was discussed.The density，viscosity，heat capacity and thermal diffusion coefficient of high purity and industrial grade 60%NaNO₃-40%KNO₃（binary molten salt） were determined by archimedean method，differential scanning calorimetry method，rotational coaxial cylinder method and laser flash method.And the data was analyzed and fitted to obtain the relationship between density and other properties with temperature changes.It was demonstrated that density，viscosity，heat capacity，and thermal conductivity of high purity binary molten salt were lower than industrial grade，which possessed good thermo-physical properties.

Key words: 60%NaNO₃-40%KNO₃ binary molten salt, purity, thermal stability, thermo-physical properties

CLC Number:

TQ131.1

LUO Zhibo, WANG Huaiyou, WANG Min, DU Baoqiang. Effect of purity on thermo-physical properties of 60% NaNO₃-40% KNO₃ binary molten salt[J]. Inorganic Chemicals Industry, 2023, 55(6): 43-49.

Figures/Tables 8

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Table 1

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Table 2

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		杂质离子质量分数/%							纯度/%
		Na⁺	Cl^-	SO₄^2-	Mg²⁺	K⁺	Fe³⁺	Ca²⁺	纯度/%
工业级	NaNO₃	26.012	0.368	3.23×10^-2	2.09×10^-2	2.15×10^-2	0.9×10^-3	2.2×10^-3	96.16
工业级	KNO₃	2.15×10^-2	0.315	0.128	2.64×10^-2	37.51	1.4×10^-3	2.2×10^-3	96.99
高纯	NaNO₃	27.04	9.48×10^-2	1.25×10^-2	2.9×10^-3	2.06×10^-2	—	1.5×10^-3	99.96
高纯	KNO₃	2.62×10^-2	9.9×10^-2	2.37×10^-2	6.9×10^-3	38.65	—	1.0×10^-3	99.94

样品	w（NO₂^-）/%
样品	T/K	0 h	888 h
工业级硝酸熔盐	773	—	1.040 7
	823	—	1.884
	873	—	2.709
高纯硝酸熔盐	773	—	0.701
	823	-	0.938
	873	—	1.673

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Effect of purity on thermo-physical properties of 60% NaNO₃-40% KNO₃ binary molten salt

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Effect of purity on thermo-physical properties of 60% NaNO3-40% KNO3 binary molten salt