Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeO
According to the coexistence theory of slag structure, a calculation model for the activity of FeO in the quaternary system SiO2-CaO-Al2O3-FeO of depleted copper slag was established. The model was used to calculate and analyze the effects of temperature (T), basicity (B), and Al2O3 content on the a...
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MDPI AG
2018-09-01
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| Series: | Metals |
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| Online Access: | http://www.mdpi.com/2075-4701/8/9/714 |
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| author | Zhi Li Guojun Ma Mengke Liu Jingjing Zou |
| author_facet | Zhi Li Guojun Ma Mengke Liu Jingjing Zou |
| author_sort | Zhi Li |
| collection | DOAJ |
| description | According to the coexistence theory of slag structure, a calculation model for the activity of FeO in the quaternary system SiO2-CaO-Al2O3-FeO of depleted copper slag was established. The model was used to calculate and analyze the effects of temperature (T), basicity (B), and Al2O3 content on the activity of FeO (NFeO). The results show that temperature has little impact on NFeO. With increased basicity, NFeO first increased slightly, then increased sharply, and finally decreased. It is easier for CaO to combine with SiO2 than FeO to form calcium silicate, which replaces FeO in 2FeO·SiO2 and increases NFeO. However, when basicity is higher than 2.0, CaO not only reacts with SiO2, but also combines with FeO to form calcium ferrate compounds to decrease NFeO. In addition, the activity of FeO decreases with increased Al2O3 content because of the reaction between CaO and Al2O3. The results can be used as a theoretical basis to guide the carbothermal reduction process of copper slag. |
| first_indexed | 2024-12-11T01:06:22Z |
| format | Article |
| id | doaj.art-1a9b222123a24e69aa4a0f2047c9a427 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-11T01:06:22Z |
| publishDate | 2018-09-01 |
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| series | Metals |
| spelling | doaj.art-1a9b222123a24e69aa4a0f2047c9a4272022-12-22T01:26:09ZengMDPI AGMetals2075-47012018-09-018971410.3390/met8090714met8090714Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeOZhi Li0Guojun Ma1Mengke Liu2Jingjing Zou3State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaState Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaState Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaState Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaAccording to the coexistence theory of slag structure, a calculation model for the activity of FeO in the quaternary system SiO2-CaO-Al2O3-FeO of depleted copper slag was established. The model was used to calculate and analyze the effects of temperature (T), basicity (B), and Al2O3 content on the activity of FeO (NFeO). The results show that temperature has little impact on NFeO. With increased basicity, NFeO first increased slightly, then increased sharply, and finally decreased. It is easier for CaO to combine with SiO2 than FeO to form calcium silicate, which replaces FeO in 2FeO·SiO2 and increases NFeO. However, when basicity is higher than 2.0, CaO not only reacts with SiO2, but also combines with FeO to form calcium ferrate compounds to decrease NFeO. In addition, the activity of FeO decreases with increased Al2O3 content because of the reaction between CaO and Al2O3. The results can be used as a theoretical basis to guide the carbothermal reduction process of copper slag.http://www.mdpi.com/2075-4701/8/9/714copper slagactivity of FeOcalculation model for activity |
| spellingShingle | Zhi Li Guojun Ma Mengke Liu Jingjing Zou Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeO Metals copper slag activity of FeO calculation model for activity |
| title | Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeO |
| title_full | Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeO |
| title_fullStr | Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeO |
| title_full_unstemmed | Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeO |
| title_short | Calculation Model for Activity of FeO in Quaternary Slag System SiO2-CaO-Al2O3-FeO |
| title_sort | calculation model for activity of feo in quaternary slag system sio2 cao al2o3 feo |
| topic | copper slag activity of FeO calculation model for activity |
| url | http://www.mdpi.com/2075-4701/8/9/714 |
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