Journal
MATERIALS TODAY COMMUNICATIONS
Volume 32, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2022.104104
Keywords
Basic oxygen furnace slag; Free lime; Blast furnace slag; Hot stage molten mixing; Reconstruction; Evolution pathway
Categories
Funding
- National Natural Science Foundation of China (NSFC) [U20A20272]
- Key Project of Handan Scientific Research Program [21122015004]
- open topic of key laboratory of material forming and structure property control from University of Science and Technology Liaoning [USTLKFSY201708]
- Hebei University of Engineering Innovation Fund [SJ010002133]
- sci-tech special commissioner system in Hebei Province, China
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By mixing original BOFS and blast furnace slag at the hot stage, the content of f-CaO in the original BOFS was effectively reduced, resulting in a significant stabilization of f-CaO and a low content of 0.52% in the reconstructed and modified slag (R&MS) after the disposal process.
Decreasing the content of the phase of free lime (f-CaO) in the basic oxygen furnace slag (BOFS) effectively is the key and prerequisite for making use of them further. Herein, for the purpose of reducing the f-CaO in original BOFS, both of the original BOFS and blast furnace slag were mixed at hot stage. In consequence for this disposal process, the f-CaO in the original BOFS is able to be stabilized evidently, and its content in reconstructed and modified slag (R&MS) can be as low as 0.52% with the elimination rate for 92.51% under the setting reaction conditions. The mineralogical findings exhibited the diffraction peaks with respect to f-CaO disappearing and there is no obvious f-CaO phase detected in R&MS samples. After reconstruction, the main mineral phases such as akermanite, merwinite and wuestite exist in R&MS. According to the analyses from ternary phase diagrams and FT-IR, the evolution of f-CaO goes through two pathways in the final formation of silicates, and the oxygen anions from the f-CaO are captured by the silicate networks.
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