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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology: Recycling and Sustainability Joint Session
Presentation Title A Rapid Method of Determining Salt Flux Melting Point and Composition
Author(s) Ray D. Peterson
On-Site Speaker (Planned) Ray D. Peterson
Abstract Scope Salt fluxes are commonly used in the recycling of dirty aluminum scraps and drosses. The salt fluxes perform many functions such as stripping away the oxide films and promoting droplet coalescence, but to be effective they must be in a molten state. The most common class of salt fluxes used in aluminum recycling contain a mixture of sodium chloride (NaCl) and potassium chloride (KCl), and often minor amounts of a fluoride compound such as cryolite. Fluxes are specified to certain chemical compositions to produce a defined melting point of the flux. The NaCl – KCl phase diagram is a simple eutectic system. By measuring the liquidus temperature of the mixture it is possible to accurately back calculate the composition of the blend and verify that the delivered flux matches the desired specifications. This paper describes a practical method for measuring the liquidus temperature and then inferring the flux composition.
Proceedings Inclusion? Planned: Light Metals


A Rapid Method of Determining Salt Flux Melting Point and Composition
An Assessment of Recyclability of Used Aluminium Coffee Capsules
Automatic Skimming Procedure for Reducing Aluminium Losses and Maintaining the Uniform Quality of the Molten Metal
Constellium R&D Approach in Recycling from Lab to Industrial Scale
Evaluation of the Effect of CO2 Cover Gas on the Rate of Oxidation of an AlMgSi Alloy
Fractional Solidification for Purification of Recycled Aluminium Alloys
Recycling of Aluminium Waste from Mixed Household Waste
Representative Sampling, Fractionation and Melting of Al-scrap

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