A commercial blend of mainly carnallite
(KCl·MgCl2·6H2O) is considered as
a next-generation heat transfer
fluid in solar thermal plants. Corrosive properties of MgCl2 hydrates must be addressed at the operating temperatures of 500–720
°C. For successful chemical monitoring of the carnallite heat
transfer fluid, an experimental method was developed to separate and
titrate for MgO and MgOHCl from solid carnallite. This new method
was assessed for error and accuracy. The method’s relative
error for MgOHCl was −7.0% for a mass fraction of 9.0 wt %
MgOHCl in the carnallite salt. The method’s relative error
for MgO was less than +1.0% for a mass fraction of 12.0 wt % MgO in
the carnallite salt. Titration results were used to track changes
in the MgOHCl concentration in carnallite salt through the carnallite’s
dehydration and purification.
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