| Title | Extensive experimental characterization of Moroccan steel and iron industry by-product for high-temperature thermal energy storage |
|---|---|
| ID_Doc | 15249 |
| Authors | Slimani, H; Baba, YF; Elharrak, A; El Hamdani, F; Bouzekri, H; Faik, A |
| Title | Extensive experimental characterization of Moroccan steel and iron industry by-product for high-temperature thermal energy storage |
| Year | 2024 |
| Published | Journal Of Thermal Analysis And Calorimetry, 149, 11 |
| Abstract | Morocco has made a concerted effort in previous years to produce renewable energy to meet market demand while protecting the environment and opening the route for circular economy. By-product from steel and iron industries in Morocco that employ electric arc furnace to produce steel is the focus of the present paper. It aims to study the possibility of using by-product "Electric Arc Furnace Slag" issued from Moroccan steel and iron industry as high-temperature sensible thermal energy storage material for the benefit of the same industry. In first, a fully characterization of the selected by-product has been performed. As a result, the filler material showed great thermophysical properties in terms of densities, thermal capacity, thermal diffusivity, and thermal conductivity. The bulk and skeletal densities are of around 3477.64 and 3913.9 kg m-3, respectively. The thermal capacity ranges between 0.3 and 0.85 kJ kg-1 K-1 for as-received by-product and from 0.6 to 0.9 kJ kg-1 K-1 for the by-product after thermal cycling. Its crystallographic structure and morphology remain similar to the one of EAF-slag studied in open literature. Thereafter, the material stability and suitability for high-temperature (up to 700 degrees C) thermal energy storage have been highlighted. The characteristics of EAF-slag after thermal cycling and isothermal study were compared to those of raw EAF-slag. Accordingly, the filler material is stable and able to store thermal energy at high temperatures. Equally important, thermal cycling impacts positively the filler material. Thanks to the oxidation to magnetite, the energy density of EAF-slag increases. More importantly, the material becomes more stable by exhibiting less than 1% of mass loss. Yet, few cracks were observed inside the cycled material. The investigation revealed that the fast-heating rate (superior to 5 degrees C min-1) is the main responsible. As a result, the authors recommend a slow heating rate especially for the first heating cycles of this by-product (around 2 degrees C min-1). |
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