Molten salts in metal treating: Present uses and future trends

Galopin, Michel; Daniel, J.S.

doi:10.1016/0300-9416(75)90008-5

Cited by 19 publications

(7 citation statements)

References 79 publications

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“…A liquid environment, such as a chemically inert molten salt bath, might be especially helpful to aid in the separation of liquid copper from steel. The bath composition could be optimized to promote coalescence of the liquid copper, increase the thermal efficiency of heating, and decrease the weight of the scrap by 25 to 60 pct due to buoyancy, [53] which would help with shaking and agitation. The salt bath could also aid in controlling substances covering end-of-life steel scrap such as, zinc, paints, and tin coatings.…”

Section: Process Developmentmentioning

confidence: 99%

Preventing Wetting Between Liquid Copper and Solid Steel: A Simple Extraction Technique

Daehn

Serrenho

Allwood

2019

Metall Mater Trans B

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Copper contamination of end-of-life steel scrap is the main barrier to high-quality recycling. Preferential melting of copper from solid steel scrap is a potential extraction technique, which could be integrated into conventional scrap re-melting with little additional energy. However, previous investigations show removal of liquid copper is limited by its adherence to solid scrap. Preventing wetting between liquid copper and steel is essential to enable separation. The carbon content of steel, initial surface oxidation, and applied coatings effect wetting behavior, but have not been systematically studied. In this study, the individual and combined effects of these parameters on wetting behavior in an inert gaseous environment are observed with a heating microscope. Carbon content appears to be the most significant factor: blistering of the oxide scale on medium-carbon steels causes liquid copper to flow rapidly between the oxide and steel substrate. Liquid copper exhibited a stable droplet on low-carbon steel, regardless of the initial level of oxidation. The tested coatings did not consistently improve nonwetting behavior, but impaired the connection between the scale and steel substrate. This study confirms the potential of the preferential melting technique, but further investigation is needed to determine the most robust process conditions to handle diverse, fragmented scrap at an industrial scale.

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Section: Process Developmentmentioning

confidence: 99%

Preventing Wetting Between Liquid Copper and Solid Steel: A Simple Extraction Technique

Daehn

Serrenho

Allwood

2019

Metall Mater Trans B

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“…chemistry in molten salts, whereas such techniques present definite appealing aspects. Pyrochemistry, that is used in metallurgy for decades [14][15][16] , has indeed already been applied for various waste treatment operations as illustrated by the following examples. The use of molten fluorides and molten chlorides has been proposed for nuclear waste treatment [17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

Advanced design of a x-ray absorption spectroscopy setup for measuring transition metals speciation in molten carbonates, hydroxides and hydrogenosulfates

Safarzadeh

Gomes

Sirieix-Plénet

et al. 2022

Review of Scientific Instruments

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Battery recycling is currently becoming a crucial issue. One possible treatment path involves the use of molten salts. A mechanistic understanding of the underlying processes requires being able to analyze in situ speciation in molten salts at various temperatures. This can be advantageously achieved using x-ray absorption spectroscopy, the use of Quick-EXAFS facilities being particularly appropriate. Consequently, this paper presents the design and development of a new setup allowing carrying out Quick-EXAFS experiments in oxidizing molten salts at high temperatures. We describe the different components of a cell and the performance of the heating device. We illustrate the capabilities of the setup by analyzing the temperature evolution of Co speciation upon dissolution of LiCoO2, a typical battery electrode material, in molten carbonates, hydroxides, and hydrogenosulphates.

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“…Molten salt technology has been widely applied in industrial applications, such as salt bath brazing, 1 heat treatment of metals, 2 hazardous waste treatment 3 and metal recovery 4 because of the highly desirable physical and chemical characteristics of molten salts including high electrical conductivity, high processing rate and fluidity. However, molten salts can cause corrosion to container materials and various components of electrolysis equipment.…”

Section: Introductionmentioning

confidence: 99%

Hot corrosion behaviour of Inconel 625 weldments in molten lithium salt

Cho

Cha

Kim

et al. 2015

Corrosion Engineering, Science and Technology

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In this study, the hot corrosion behaviour of Inconel 625 weldments in a molten lithium salt (LiCl-1 wt-%Li 2 O) was investigated at 6508C. The hot corrosion behaviour was observed through measurements of the oxide morphology, attack depth and compositional changes of the weldment. The corrosion products of as received (W625) and post-weld heat treated specimens (W625H) under isothermal load were Li 4 MoO 5 and NiFe 2 O 4 , while FeNi 3 , Li 4 MoO 5 and NiFe 2 O 4 were identified as the corrosion products of as received cyclic specimens under cyclic heat load. The difference in weight loss between W625 and W625H was negligible, whereas very low weight loss was observed in cyclic specimens (W625C).

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Molten salts in metal treating: Present uses and future trends

Cited by 19 publications

References 79 publications

Preventing Wetting Between Liquid Copper and Solid Steel: A Simple Extraction Technique

Preventing Wetting Between Liquid Copper and Solid Steel: A Simple Extraction Technique

Advanced design of a x-ray absorption spectroscopy setup for measuring transition metals speciation in molten carbonates, hydroxides and hydrogenosulfates

Hot corrosion behaviour of Inconel 625 weldments in molten lithium salt

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