Publications by authors named "Harald Philipson"
Pilot-Scale Aluminothermic Production of Silicon Alloy and Alumina-Rich Slag.
ACS Sustain Chem Eng
October 2024
Article Synopsis
- The SisAl process offers a sustainable way to produce silicon and alumina using side streams from the silicon and aluminum industries, addressing the growing global demand for these materials.
- Pilot-scale trials confirmed the process's stability and controllability, with silicon alloy compositions averaging 70-75% Si, while different reductants showed minimal impact on alloy composition.
- Adjusting the stoichiometry of input materials allows control over product composition, and acidic slag performed better for future scaling, yielding higher silicon and alumina content compared to neutral slags.
To achieve better process control of silicon (Si) alloy production using aluminum as a reductant of calcium silicate (CaO-SiO) slag, it is necessary to understand the reaction phenomena concerning the behavior of formed phases at the metal-slag interface during conversion. The interfacial interaction behavior of non-agitated melt was investigated using the sessile drop method for varying time and temperature, followed by EPMA phase analysis at the vicinity of the metal-slag interface. The most remarkable features of the reaction were the accumulation of solid calcium aluminate product layers at the Al alloy-slag interface and spontaneous emulsion of Si-alloy droplets in the slag phase.
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