| Title | Optimizing Synthesis Parameters for Ferroalloy Production from Mill Scale and Aluminum Dross: Advancing Circular Economy Practices |
|---|---|
| ID_Doc | 5726 |
| Authors | Wongsawan, P; Srichaisiriwech, W; Kongkarat, S |
| Title | Optimizing Synthesis Parameters for Ferroalloy Production from Mill Scale and Aluminum Dross: Advancing Circular Economy Practices |
| Year | 2024 |
| Published | Journal Of Sustainable Metallurgy, 10, 3 |
| Abstract | Mill scale and aluminum dross are by-products generated from the steel and aluminum industries, comprised mainly of Fe2O3 and Al2O3, respectively. In particular, aluminum dross has been regarded as hazardous waste and has not been widely utilized. This research investigates the synthesis of ferroalloys from the scale and dross via carbothermic reduction reactions. Two sets of experiments were conducted to examine the synthesis parameters for ferroalloy production. The process involved blending and compacting a mixture of scale, dross, and graphite powders to create flat pellets, which were then subjected to heating at 1550 degrees C for 3 h under an argon atmosphere. Fibrous alumina, dark gray substances, and metallic droplets were observed as the products, indicating the occurrence of carbothermic reduction reactions. The resulting metallic droplets consisted of Fe3Si and Fe3Al intermetallic phases. The presence of Fe3Si phase was expected to be due to the high driving force of SiO2 reduction at the experimental temperature. The aluminum concentration in the ferroalloy decreased with an increase in carbon content in the pellet, whereas the silicon concentration increased. Higher dross content in the pellet led to elevated levels of silicon and aluminum in the ferroalloy. Adequate particle compaction was found to be crucial for ensuring a sufficient quantity and even distribution of the ferroalloy droplets within the bulk pellets. Optimal parameters for the ferroalloy production from mill scale and aluminum dross at 1550 degrees C were found to be the compacted pellets with a scale:dross ratio of 60:40 to 70:30 and a carbon concentration (C/O ratio) of 1.2. This research presents an innovative method for valorizing mill scale and aluminum dross, demonstrating potential for advancement toward a circular economy. |
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