Sigma Thermal, Inc.

Sigma Thermal, Inc.

4875 Deen Rd Marietta, GA 30066, USA

Molten Salts

Molten Salts

Molten salts, sometimes referred to as salt melts, are a family of products used for a wide range of applications like high-temperature process heating, heat treating and annealing of steel, and thermal storage in solar thermal power plants.  These salts are composed of fluoride, chloride, and nitrate salts.

Molten salts have the advantage of very high liquid phase operating temperatures (1,000°F or higher) with little or no vapor pressure.  Molten salts can replace organic or synthetic oils in heat transfer applications. While molten salts do offer a substantial benefit with their high operating temperatures, they can also have the undesirable characteristic of very high freezing points (ranging from 248°F to 428°F).

There are three primary types of molten salt heating systems: salt bath heaters, circulated molten salt, and direct heating for applications like heat treating metal assemblies. There can challenges with all of these system types: metallurgy, instruments, system component selection, heat tracing, melting and draining, just to name a few.

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