Lanzhou University of Technology Institutional Repository （LUT_IR）
| Oxidation of Fayalite in Molten Nickel Slag | |
Ma, Yongbo1,2; Du, Xueyan1,2
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| 2020-01 | |
| Source Publication | RUSSIAN JOURNAL OF NON-FERROUS METALS
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| ISSN | 1067-8212 |
| Volume | 61Issue:1Pages:1-8 |
| Abstract | This paper investigated the oxidation of fayalite (Fe2SiO4) in iron-rich nickel slag (INS) for iron recycling via an oxidation-magnetic separation method. A phase stability diagram of the FeO-SiO2-MgO-CaO-O-2 system drawn by FactSage 7.1 illustrates that magnetite (Fe3O4) can be crystallized from liquid slag in an air atmosphere, but the further oxidation to Fe2O3 in molten slag was extremely hard. The mass content of divalent iron (w(Fe2+)) decreased and the ratio of trivalent iron to divalent iron (w(Fe3+)/w(Fe2+)) increased gradually with increasing oxidation time. The results show that an air flow rate of 300-500 mL/min, a basicity of 0.90-1.10, and a temperature of 1658-1728 K are conducive to the oxidation of Fe2SiO4 in INS. Fe3O4 is the main iron-bearing phase, and Fe2O3 is not observed in the X-ray diffraction (XRD) patterns. Silicates in the oxidized nickel slag (ONS) are mainly augite (Ca(Mg,Fe)Si2O6), forsterite ((Mg,Fe)(2)SiO4), and monticellite (CaMgSiO4), while akermanite (Ca2MgSi2O7) is observed only for a basicity up to 1.10. The oxidation kinetics of Fe2SiO4 in INS are first order with an apparent activation energy (E-a) of 315.16 kJ/mol. |
| Keyword | oxidation fayalite nickel slag magnetite silicate |
| DOI | 10.3103/S1067821220010174 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Science and Technology Major Project Plan of Gansu Province[145RTSA004] |
| WOS Research Area | Metallurgy & Metallurgical Engineering |
| WOS Subject | Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000522169100001 |
| Publisher | PLEIADES PUBLISHING INC |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | https://ir.lut.edu.cn/handle/2XXMBERH/76654 |
| Collection | 省部共建有色金属先进加工与再利用国家重点实验室 材料科学与工程学院 研究生院 |
| Corresponding Author | Du, Xueyan |
| Affiliation | 1.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou, Peoples R China 2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou, Peoples R China |
| First Author Affilication | Coll Mat Sci & Engn; State Key Laboratory Of Gansu Advanced Non-Ferrous Metal Materials |
| Corresponding Author Affilication | Coll Mat Sci & Engn; State Key Laboratory Of Gansu Advanced Non-Ferrous Metal Materials |
| First Signature Affilication | Coll Mat Sci & Engn |
| Recommended Citation GB/T 7714 | Ma, Yongbo,Du, Xueyan. Oxidation of Fayalite in Molten Nickel Slag[J]. RUSSIAN JOURNAL OF NON-FERROUS METALS,2020,61(1):1-8. |
| APA | Ma, Yongbo,&Du, Xueyan.(2020).Oxidation of Fayalite in Molten Nickel Slag.RUSSIAN JOURNAL OF NON-FERROUS METALS,61(1),1-8. |
| MLA | Ma, Yongbo,et al."Oxidation of Fayalite in Molten Nickel Slag".RUSSIAN JOURNAL OF NON-FERROUS METALS 61.1(2020):1-8. |
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