Effect of composition on the density of multi-component molten nitrate salts

by Livermore Sandia National Laboratories, CA

Other authorsRobert W. Bradshaw
Technical Report, 2009


CSP Unique ID 190708683


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SAND Report: SAND2009-8221, December 2009.


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The density of molten nitrate salts was measured to determine the effects of the constituents on the density of multi-component mixtures. The molten salts consisted of various proportions of the nitrates of potassium, sodium, lithium and calcium. Density measurements were performed using
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an Archimedean method and the results were compared to data reported in the literature for the individual constituent salts or simple combinations, such as the binary Solar Salt mixture of NaNO3 and KNO3. The addition of calcium nitrate generally increased density, relative to potassium nitrate or sodium nitrate, while lithium nitrate decreased density. The temperature dependence of density is described by a linear equation regardless of composition. The molar volume, and thereby, density of multi-component mixtures can be calculated as a function of temperature using a linear additivity rule based on the properties of the individual constituents.
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