Molten sodium nitrite-sodium nitrate-potassium nitrate eutectic: The reactions and spectra of iron(III), cobalt(II), nickel(II) and copper(II) compounds

Eweka, E.I.; Kerridge, D.H.

doi:10.1016/s0040-6031(96)02960-7

Cited by 11 publications

(3 citation statements)

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“…Alkali metal nitrites were used earlier as admixtures to nitrates to enhance the reactivity of the melts, since nitrite anion is a stronger oxobase than nitrate. Moreover, it has been supposed that nitrite impurities always present in the commercial alkali metal nitrates may play a crucial role in the reactivity of the latter. , Similar to nitrates, nitrite melts have been used to prepare fine oxide powders at moderated temperatures. The higher basicity of nitrite was used to transform titanium sulfate precursor to the titanate oxoanions, which cannot be done in nitrate fluxes …”

Section: Resultsmentioning

confidence: 99%

Preparation of Mixed Phosphates in Molten Alkali Metal Nitrates

Afanasiev

1999

Chem. Mater.

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Mixed phosphates of alkali metals and main or transition group metals were obtained from the reactions of different starting salts of metals (nitrates, chlorides) and ammonium hydrogen monophosphate at 673−823 K in the alkali metal nitrate fluxes. The products obtained include submicrometer dispersions of known commercially important compounds, among which are KTiOPO4 (KTP), a number of ABPO4 phases (where A stands for alkali metal; B, bivalent transition or main group metal), as well as various substituted phases, derived from the NASICON NaZr2(PO4)3 and lamellar zirconium phosphate structure. Sometimes novel mixed phosphates were formed, such as those of sodium and nickel or cobalt, for which stoichiometric composition and/or elementary cell parameters have been established. The dependence of composition of solid products on the nature of reacting species and reaction conditions was discussed. Possible extensions of method by means of chemical modifications with admixtures of nitrite and fluoride species were considered and illustrated by several examples.

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Section: Resultsmentioning

confidence: 99%

Preparation of Mixed Phosphates in Molten Alkali Metal Nitrates

Afanasiev

1999

Chem. Mater.

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“…There are reports that metal nitrate salt mixtures can oxidize other transition metals present in the drum such as lead, cobalt, iron, tin and copper to their respective oxides at elevated temperatures. [Eweka 1996;Kerridge 1991] These transition metal oxides could also serve as catalysts for oxidation and nitration of organics. [Kerridge 1991] There are several published studies describing the use of metal nitrate mixtures as heat storage medium.…”

Section: Other Factors That Can Influence Reaction Chemistrymentioning

confidence: 99%

Waste Isolation Pilot Plant Technical Assessment Team Report

Wilson

Baker

Hart

et al. 2015

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“…In salts with equal proportions of nitrate and nitrite, chromium compounds react largely with the nitrite. This suggests that in pure nitrate melts, the reactivity is governed by the nitrite that is in thermal equilibrium with the nitrate [Eweka and Kerridge 1996].…”

Section: Nitrate-nitrite Saltsmentioning

confidence: 99%

Engineering Database of Liquid Salt Thermophysical

Sohal¹,

Ebner²,

Sabhar³

2013

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The purpose of this report is to provide a review of thermophysical properties and thermochemical characteristics of candidate molten salt coolants, which may be used as a primary coolant within a nuclear reactor or heat transport medium from the Very High Temperature Reactor (VHTR) to a processing plant; for example, a hydrogen-production plant. Thermodynamic properties of four types of molten salts, including LiF-BeF 2 (67 and 33 mol%, respectively; also known as FLiBe), LiF-NaF-KF (46.5, 11.5, and 52 mol%, also known as FLiNaK), and KCl-MgCl 2 (67 and 33 mol%), and sodium nitrate-sodium nitrite-potassium nitrate (NaNO 3 -NaNO 2 -KNO 3 , 7-49-44 mol%, also known as Hitec® salt) have been investigated. Limitations of existing correlations to predict density, viscosity, specific heat capacity, surface tension, and thermal conductivity were identified. The impact of thermodynamic properties on the heat transfer, especially the Nusselt number, was also discussed.Stability of the molten salts with structural alloys and their compatibility with the structural alloys was studied. Nickel and high temperature alloys with dense Ni coatings are effectively inert to corrosion in fluorides, but not so in chlorides. Of the chromium containing alloys, Hastelloy N appears to have the best corrosion resistance in fluorides, while Haynes 230 was the most resistant in chloride. In general, alloys with increasing carbon and chromium content are increasingly subject to corrosion by the fluoride salts FLiBe and FLiNaK due to attack and dissolution of the intergranular chromium carbide. Future research to obtain needed information was identified.

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Molten sodium nitrite-sodium nitrate-potassium nitrate eutectic: The reactions and spectra of iron(III), cobalt(II), nickel(II) and copper(II) compounds

Cited by 11 publications

References 10 publications

Preparation of Mixed Phosphates in Molten Alkali Metal Nitrates

Preparation of Mixed Phosphates in Molten Alkali Metal Nitrates

Waste Isolation Pilot Plant Technical Assessment Team Report

Engineering Database of Liquid Salt Thermophysical

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