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| Identification of secondary raw materials in mold powders and their melting behavior |
| Irmtraud Marschall1, Nathalie Kolbl2, Harald Harmuth2, Christina Atzenhofer2 |
| 1 K1-MET GmbH, 8700 Leoben, Austria
2 Department Mineral Resources Engineering, Chair of Ceramics, Montanuniversitaet Leoben, 8700 Leoben, Austria |
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Abstract Commercial mold powders use a limited number of main mineral constituents, but may differ significantly in chemical composition. The main mineral raw materials of specimens investigated here are quartz, fluorite and free carbon, as well as wollastonite and carbonates. The investigations revealed the use of secondary raw materials like blast furnace slag, fly ash, glass scrap and phosphorous slag as further components. Since the formation of cuspidine was one major point of interest, the influence of the silica source on its formation was identified. A replacement of wollastonite by blast furnace slag reduced the temperature of the first precipitation of cuspidine by about 100 °C; the dissociation of sodium carbonate was lowered by ~ 40 °C. The lowest temperature of the first Na2CO3 dissociation could be achieved by using fluorine in combination with blast furnace slag. Cuspidine formation from the melt is further decreased if sodium and fluorine are both present. The use of glass scrap and phosphorous slag strongly reduced the temperature of first melt formation and enhanced cuspidine formation.
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Received: 20 July 2018
Published: 21 December 2018
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Irmtraud Marschall,Nathalie Kolbl,Harald Harmuth, et al. Identification of secondary raw materials in mold powders and their melting behavior[J]. Journal of Iron and Steel Research International, 2019, 26(4): 403-411.
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2019, Vol. 26 
