Effect of Erosion Behavior of FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> Blast Furnace Primary Slag on Al<sub>2</sub>O<sub>3</sub> Substrate
Al<sub>2</sub>O<sub>3</sub> substrate is widely used as a lining refractory material throughout the blast furnace (BF) process. Accordingly, the erosion of Al<sub>2</sub>O<sub>3</sub> refractory by molten slag has a negative influence on the running co...
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MDPI AG
2021-08-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/8/957 |
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| author | Xiangyang Pan Fengman Shen Qiangjian Gao Xin Jiang Haiyan Zheng |
| author_facet | Xiangyang Pan Fengman Shen Qiangjian Gao Xin Jiang Haiyan Zheng |
| author_sort | Xiangyang Pan |
| collection | DOAJ |
| description | Al<sub>2</sub>O<sub>3</sub> substrate is widely used as a lining refractory material throughout the blast furnace (BF) process. Accordingly, the erosion of Al<sub>2</sub>O<sub>3</sub> refractory by molten slag has a negative influence on the running cost and smooth operation of BFs. The effect of the erosion behavior of BF primary slag containing FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> on Al<sub>2</sub>O<sub>3</sub> substrate refractory was fundamentally investigated using the high-temperature contact angle method and FactSage thermodynamic software based on the composition of BF primary slag in a typical iron and steel enterprise of China. The results showed that the primary slag mentioned above was easily wetted with Al<sub>2</sub>O<sub>3</sub> substrate, and the observed contact angles were 24.5° and 22.0°, when the FeO mass fraction (<i>w</i>(FeO)) was maintained at 10% and 15% of the primary slag, respectively. Moreover, the starting melting temperature of the primary slag with high FeO content, of 1263 °C, was lower. The erosion thickness between the slag and Al<sub>2</sub>O<sub>3</sub> substrate increased from 19.23 to 23.17 μm as the added <i>w</i>(FeO) increased from 10% to 15%. In addition, it was observed via SEM-EDS analysis that the interface layer was formed, and high-melting-point compounds were generated during the wetting process. This was attributed to the interaction between the molten slag and Al<sub>2</sub>O<sub>3</sub> existing in the substrate, which may have inhibited the continuous dissolution of the Al<sub>2</sub>O<sub>3</sub> in the substrate into slag. Good surface wettability and the dissolution of the Al<sub>2</sub>O<sub>3</sub> substrate refractory into the primary slag of the BF are two dominant factors leading to the erosion of the refractory. |
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| language | English |
| last_indexed | 2024-03-10T08:53:19Z |
| publishDate | 2021-08-01 |
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| spelling | doaj.art-231656b29fdd46af89fa0682bedae61d2023-11-22T07:17:24ZengMDPI AGCrystals2073-43522021-08-0111895710.3390/cryst11080957Effect of Erosion Behavior of FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> Blast Furnace Primary Slag on Al<sub>2</sub>O<sub>3</sub> SubstrateXiangyang Pan0Fengman Shen1Qiangjian Gao2Xin Jiang3Haiyan Zheng4School 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, ChinaAl<sub>2</sub>O<sub>3</sub> substrate is widely used as a lining refractory material throughout the blast furnace (BF) process. Accordingly, the erosion of Al<sub>2</sub>O<sub>3</sub> refractory by molten slag has a negative influence on the running cost and smooth operation of BFs. The effect of the erosion behavior of BF primary slag containing FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> on Al<sub>2</sub>O<sub>3</sub> substrate refractory was fundamentally investigated using the high-temperature contact angle method and FactSage thermodynamic software based on the composition of BF primary slag in a typical iron and steel enterprise of China. The results showed that the primary slag mentioned above was easily wetted with Al<sub>2</sub>O<sub>3</sub> substrate, and the observed contact angles were 24.5° and 22.0°, when the FeO mass fraction (<i>w</i>(FeO)) was maintained at 10% and 15% of the primary slag, respectively. Moreover, the starting melting temperature of the primary slag with high FeO content, of 1263 °C, was lower. The erosion thickness between the slag and Al<sub>2</sub>O<sub>3</sub> substrate increased from 19.23 to 23.17 μm as the added <i>w</i>(FeO) increased from 10% to 15%. In addition, it was observed via SEM-EDS analysis that the interface layer was formed, and high-melting-point compounds were generated during the wetting process. This was attributed to the interaction between the molten slag and Al<sub>2</sub>O<sub>3</sub> existing in the substrate, which may have inhibited the continuous dissolution of the Al<sub>2</sub>O<sub>3</sub> in the substrate into slag. Good surface wettability and the dissolution of the Al<sub>2</sub>O<sub>3</sub> substrate refractory into the primary slag of the BF are two dominant factors leading to the erosion of the refractory.https://www.mdpi.com/2073-4352/11/8/957Al<sub>2</sub>O<sub>3</sub> substrate<i>w</i>(FeO)line scanningwettabilityerosion thickness |
| spellingShingle | Xiangyang Pan Fengman Shen Qiangjian Gao Xin Jiang Haiyan Zheng Effect of Erosion Behavior of FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> Blast Furnace Primary Slag on Al<sub>2</sub>O<sub>3</sub> Substrate Crystals Al<sub>2</sub>O<sub>3</sub> substrate <i>w</i>(FeO) line scanning wettability erosion thickness |
| title | Effect of Erosion Behavior of FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> Blast Furnace Primary Slag on Al<sub>2</sub>O<sub>3</sub> Substrate |
| title_full | Effect of Erosion Behavior of FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> Blast Furnace Primary Slag on Al<sub>2</sub>O<sub>3</sub> Substrate |
| title_fullStr | Effect of Erosion Behavior of FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> Blast Furnace Primary Slag on Al<sub>2</sub>O<sub>3</sub> Substrate |
| title_full_unstemmed | Effect of Erosion Behavior of FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> Blast Furnace Primary Slag on Al<sub>2</sub>O<sub>3</sub> Substrate |
| title_short | Effect of Erosion Behavior of FeO-CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub> Blast Furnace Primary Slag on Al<sub>2</sub>O<sub>3</sub> Substrate |
| title_sort | effect of erosion behavior of feo cao sio sub 2 sub mgo al sub 2 sub o sub 3 sub blast furnace primary slag on al sub 2 sub o sub 3 sub substrate |
| topic | Al<sub>2</sub>O<sub>3</sub> substrate <i>w</i>(FeO) line scanning wettability erosion thickness |
| url | https://www.mdpi.com/2073-4352/11/8/957 |
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