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Investigation of the smelting reduction mechanism and of iron extraction from high-iron red mud
| Content Provider | Scilit |
|---|---|
| Author | Wang, Kun Liu, Yan Zhang, Ting-An Li, Xiao-Fei Chen, Xin |
| Copyright Year | 2020 |
| Description | Journal: Materials Research Express High-iron red mud presents a problem due to its alkalinity which leads to significant risks to the environment. In order to realize the harmless and large-scale utilization of high-iron red mud, the smelting reduction experiments were carried out to investigate the reaction mechanism for extraction iron from high-iron red mud. FactSage 6.4 software was used to conduct thermodynamic analysis of the carbon thermal reduction system. The results showed that the direct reduction with carbon involved a process of $Fe_{2}O_{3}$ → $Fe_{3}O_{4}$ → FeO → Fe, in which the theoretical required molar ratio of C/O (oxygen in $Fe_{2}O_{3}$) was 1:1. The maximum degree of iron extraction was 92.8% with anthracite as reductant and 88.8% without anthracite smelting at 1500 °C for 30 min in a graphite crucible. XRD was conducted to analyze the mineral phase of the samples and slags. The results showed that the minerals contained in high-iron red mud were hematite, quartz, rutile, and sodium aluminosilicate hydrate. The blank sample was consisted of hematite, nepheline quartz, and the reduced slag without quenching consisted of perovskite and gehlenite, indicating that the reaction processes occurred from sodium aluminosilicate hydrate to nepheline and then occurred from nepheline to gehlenite in slagging process. The overall smelting reduction process was described as three mass transfer steps and three chemical reaction steps. These results provide useful information for large-scale and harmless utilization of high-iron red mud. |
| Related Links | https://iopscience.iop.org/article/10.1088/2053-1591/abd137/pdf |
| ISSN | 20531591 |
| e-ISSN | 20531591 |
| DOI | 10.1088/2053-1591/abd137 |
| Journal | Materials Research Express |
| Issue Number | 12 |
| Volume Number | 7 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2020-12-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Materials Research Express Mining and Mineral Processing Iron Red Mud High Iron Red Utilization of High |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Metals and Alloys Biomaterials Electronic, Optical and Magnetic Materials Polymers and Plastics |
