Effect of basicity on metallurgical properties of magnesium fluxed pellets
| Autor: | Mansheng Chu, Jie Li, Wei-Xing Liu, An Haifei, Ai-Min Yang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Magnesium Metallurgy 0211 other engineering and technologies Metals and Alloys Pellets chemistry.chemical_element 02 engineering and technology Pelletizing 01 natural sciences chemistry.chemical_compound Compressive strength chemistry Mechanics of Materials 0103 physical sciences Pellet Materials Chemistry Porosity 021102 mining & metallurgy Magnetite Roasting |
| Zdroj: | Journal of Iron and Steel Research International. 27:239-247 |
| ISSN: | 2210-3988 1006-706X |
| DOI: | 10.1007/s42243-019-00307-w |
| Popis: | Magnesium fluxed pellets are the focus of blast furnace burden research for reducing environmental load. The pelletizing, roasting and metallurgical properties of a Chinese fine magnetite ore with the addition of magnesium flux were experimentally tested, and the effects of basicity on the consolidation behavior, compressive strength, and reducibility of magnesium fluxed pellets were systematically clarified. Then, the mechanisms were analyzed by means of thermodynamics calculation and scanning electron microscopy–energy-dispersive spectrometry analysis methods. The results show that the consolidation behavior of magnesium fluxed pellets during roasting process was obviously promoted with increasing the basicity of the magnesium fluxed pellets. The compressive strength increased firstly and then decreased, reaching the maximum value of 2352 N/pellet with the basicity of 1.0. The reduction degree increased gradually with enhancing the basicity owing to the fact that the decomposition of the added CaCO3 could increase the porosity of pellets, thereby increasing the CO diffusion in pellet during reduction. Simultaneously, the reduction swelling index was improved with increasing the basicity because the generated calcium ferrite could effectively suppress the growth of iron whiskers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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