Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio Based on Observed Data
With the gradual depletion of high-quality iron-ore resources, ironmaking blast furnaces have gradually shifted to using high-content Al<sub>2</sub>O<sub>3</sub> iron ore. Under this condition, the addition of MgO in the slag is adopted to alleviate operation problems caused...
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MDPI AG
2020-06-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/6/784 |
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| author | Fengman Shen Xinguang Hu Haiyan Zheng Xin Jiang Qiangjian Gao Hongsong Han Fang Long |
| author_facet | Fengman Shen Xinguang Hu Haiyan Zheng Xin Jiang Qiangjian Gao Hongsong Han Fang Long |
| author_sort | Fengman Shen |
| collection | DOAJ |
| description | With the gradual depletion of high-quality iron-ore resources, ironmaking blast furnaces have gradually shifted to using high-content Al<sub>2</sub>O<sub>3</sub> iron ore. Under this condition, the addition of MgO in the slag is adopted to alleviate operation problems caused by the high content of Al<sub>2</sub>O<sub>3</sub>. However, the proper value of the MgO/Al<sub>2</sub>O<sub>3</sub> ratio for blast-furnace slag systems (Al<sub>2</sub>O<sub>3</sub> = 8–25%) is not systematically studied. In this paper, we discuss the proper MgO/Al<sub>2</sub>O<sub>3</sub> ratio on the basis of blast-furnace slag systems under different Al<sub>2</sub>O<sub>3</sub> contents. On the basis of thermodynamics and phase-diagram analysis, it could be concluded that: (1) the MgO/Al<sub>2</sub>O<sub>3</sub> ratio is not limited when Al<sub>2</sub>O<sub>3</sub> in slag is less than 14%, (2) the MgO/Al<sub>2</sub>O<sub>3</sub> ratio is required to be in the range of 0.40–0.50 when Al<sub>2</sub>O<sub>3</sub> in the slag is 15–17%, and (3) the MgO/Al<sub>2</sub>O<sub>3</sub> ratio should be 0.45–0.55 when Al<sub>2</sub>O<sub>3</sub> in the slag is larger than 18%. The proper MgO/Al<sub>2</sub>O<sub>3</sub> ratio value has been established in various industries, and it has achieved significant economic and social benefits. |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T19:12:30Z |
| publishDate | 2020-06-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-d7bc25c418094385990965e692920a3a2023-11-20T03:41:37ZengMDPI AGMetals2075-47012020-06-0110678410.3390/met10060784Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio Based on Observed DataFengman Shen0Xinguang Hu1Haiyan Zheng2Xin Jiang3Qiangjian Gao4Hongsong Han5Fang Long6School of Metallurgy, Northeastern University, Shenyang 110819, ChinaSchool of Metallurgy, Northeastern University, Shenyang 110819, ChinaSchool of Metallurgy, Northeastern University, Shenyang 110819, ChinaSchool of Metallurgy, Northeastern University, Shenyang 110819, ChinaSchool of Metallurgy, Northeastern University, Shenyang 110819, ChinaSchool of Metallurgy, Northeastern University, Shenyang 110819, ChinaSchool of Metallurgy, Northeastern University, Shenyang 110819, ChinaWith the gradual depletion of high-quality iron-ore resources, ironmaking blast furnaces have gradually shifted to using high-content Al<sub>2</sub>O<sub>3</sub> iron ore. Under this condition, the addition of MgO in the slag is adopted to alleviate operation problems caused by the high content of Al<sub>2</sub>O<sub>3</sub>. However, the proper value of the MgO/Al<sub>2</sub>O<sub>3</sub> ratio for blast-furnace slag systems (Al<sub>2</sub>O<sub>3</sub> = 8–25%) is not systematically studied. In this paper, we discuss the proper MgO/Al<sub>2</sub>O<sub>3</sub> ratio on the basis of blast-furnace slag systems under different Al<sub>2</sub>O<sub>3</sub> contents. On the basis of thermodynamics and phase-diagram analysis, it could be concluded that: (1) the MgO/Al<sub>2</sub>O<sub>3</sub> ratio is not limited when Al<sub>2</sub>O<sub>3</sub> in slag is less than 14%, (2) the MgO/Al<sub>2</sub>O<sub>3</sub> ratio is required to be in the range of 0.40–0.50 when Al<sub>2</sub>O<sub>3</sub> in the slag is 15–17%, and (3) the MgO/Al<sub>2</sub>O<sub>3</sub> ratio should be 0.45–0.55 when Al<sub>2</sub>O<sub>3</sub> in the slag is larger than 18%. The proper MgO/Al<sub>2</sub>O<sub>3</sub> ratio value has been established in various industries, and it has achieved significant economic and social benefits.https://www.mdpi.com/2075-4701/10/6/784three-segment controlMgO/Al<sub>2</sub>O<sub>3</sub> ratioBF slaghigh Al<sub>2</sub>O<sub>3</sub> |
| spellingShingle | Fengman Shen Xinguang Hu Haiyan Zheng Xin Jiang Qiangjian Gao Hongsong Han Fang Long Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio Based on Observed Data Metals three-segment control MgO/Al<sub>2</sub>O<sub>3</sub> ratio BF slag high Al<sub>2</sub>O<sub>3</sub> |
| title | Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio Based on Observed Data |
| title_full | Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio Based on Observed Data |
| title_fullStr | Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio Based on Observed Data |
| title_full_unstemmed | Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio Based on Observed Data |
| title_short | Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al<sub>2</sub>O<sub>3</sub> Ratio Based on Observed Data |
| title_sort | proper mgo al sub 2 sub o sub 3 sub ratio in blast furnace slag analysis of proper mgo al sub 2 sub o sub 3 sub ratio based on observed data |
| topic | three-segment control MgO/Al<sub>2</sub>O<sub>3</sub> ratio BF slag high Al<sub>2</sub>O<sub>3</sub> |
| url | https://www.mdpi.com/2075-4701/10/6/784 |
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