Purification Strategy and Effect of Impurities on Corrosivity of Dehydrated Carnallite for Thermal Solar Applications

Youyang Zhao, Judith Vidal, Noah Klammer

Research output: Contribution to journalArticlepeer-review

32 Scopus Citations

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.

Original languageAmerican English
Pages (from-to)41664-41671
Number of pages8
JournalRSC Advances
Volume9
Issue number71
DOIs
StatePublished - 2019

Bibliographical note

Publisher Copyright:
This journal is © The Royal Society of Chemistry.

NREL Publication Number

  • NREL/JA-5500-75487

Keywords

  • carnallite
  • CSP
  • solar

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