Issue 71, 2019, Issue in Progress

Purification strategy and effect of impurities on corrosivity of dehydrated carnallite for thermal solar applications

Abstract

This paper presents a purification method for dehydrated carnallite (DC)—a commercial ternary MgCl2–KCl–NaCl salt—for concentrating solar power (CSP) applications based on a thermal and chemical treatment using the reduction power of Mg. The purification is effective at reducing MgOH+ by an order of magnitude—from around 5 wt% in non-treated salt to less than 0.5 wt% in post-purification salt. The corresponding decrease in the measured corrosion rate of Haynes 230 at 800 °C from >3200 μm per year to around 40 μm per year indicates that soluble MgOH+ is indeed correlated to corrosion. The addition of elemental Mg serves as both a scavenger of impurities and corrosion potential control, which are considered the primary mechanisms for corrosion mitigation.

Graphical abstract: Purification strategy and effect of impurities on corrosivity of dehydrated carnallite for thermal solar applications

Article information

Article type
Paper
Submitted
10 Nov 2019
Accepted
10 Dec 2019
First published
16 Dec 2019
This article is Open Access
Creative Commons BY license

RSC Adv., 2019,9, 41664-41671

Purification strategy and effect of impurities on corrosivity of dehydrated carnallite for thermal solar applications

Y. Zhao, N. Klammer and J. Vidal, RSC Adv., 2019, 9, 41664 DOI: 10.1039/C9RA09352D

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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