Hot Modification of Silicomanganese Slag in Its Crystallization and Viscosity Properties for Preparation of Cast Stone
The direct hot modification and subsequent preparation of qualified building materials from molten slag has gained significant attention at present due to its characteristics of saving energy and reducing CO<sub>2</sub> emissions. Molten silicomanganese slag, discharged at 1500–1600 °C w...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-02-01
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| Series: | Ceramics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2571-6131/8/1/22 |
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| Summary: | The direct hot modification and subsequent preparation of qualified building materials from molten slag has gained significant attention at present due to its characteristics of saving energy and reducing CO<sub>2</sub> emissions. Molten silicomanganese slag, discharged at 1500–1600 °C with high content of SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> (above 50 mass%), was suitable for the preparation of casting stone. To ensure a qualified casting stone, the study focused on improving the crystallization properties and fluidity of molten silicomanganese slag by modifying of its composition, crystallization, structure, and viscosity. The raw slag and two modified slags were compared, and the physical properties of their final cast stone were discussed. The results showed that after being modified by addition of 10 mass% chromite and serpentine or 20 mass% ferrochrome slag into the silicomanganese slag, both the crystallization ability and fluidity of the molten slag were improved simultaneously. Augite and spinel precipitated in the modified slag, compared with glass phase in the raw slag. The precipitation of spinel, on the one hand, acted as a nucleation agent, dynamically promoting the formation of augite, and on the other hand, increased the proportion of SiO<sub>2</sub> and its polymerization of [SiO<sub>4</sub>] structural units in the residual liquid slag, further promoting the generation of augite in the composition and structure. The gradual precipitation of crystals effectively mitigated sudden viscosity fluctuations resulting from crystallization, contributing to a smooth casting process for molten slag. Both cast stones from the modified slag exhibited qualified physical properties, compared with the broken glass from the raw slag. This indicated the feasibility of low-cost modification during the discharging process of molten silicomanganese slag by blending 10 mass% cold modifiers or 20 mass% molten ferrochrome slag into it. |
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| ISSN: | 2571-6131 |