Influence of sintering atmosphere on crystals and performance of slag ceramics
The preparation of ceramic materials is a new way of utilizing steel slag. It is important to investigate the influence of different sintering atmosphere on steel slag ceramics, which is of great significance in promoting the application of steel slag ceramic technology. In this paper, 20% of steel...
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Science Press
2018-03-01
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| Series: | 工程科学学报 |
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| Online Access: | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2018.03.010 |
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| author | LI Yu WANG Yao-zhong WANG Ya-kun |
| author_facet | LI Yu WANG Yao-zhong WANG Ya-kun |
| author_sort | LI Yu |
| collection | DOAJ |
| description | The preparation of ceramic materials is a new way of utilizing steel slag. It is important to investigate the influence of different sintering atmosphere on steel slag ceramics, which is of great significance in promoting the application of steel slag ceramic technology. In this paper, 20% of steel slag and 80% of clay were used as the main raw materials under different atmospheres, namely, air and nitrogen, and were prepared into steel slag ceramic bricks. The ceramic bricks'crystal phase evolvement and performance were analyzed, and the effect of partial oxygen pressure on the oxidation of Fe2+ in the steel slag ceramics was investigated quantitatively. The results show that under air conditions, the Fe2+ in raw materials is oxidized to form the hematite phase, and the compressive strength and water absorption of sintered samples were 310 MPa and 3.7%, respectively, which is better than those of sintered samples under nitrogen conditions. Under nitrogen condition, the Fe2+ in the raw material is kept unchanged to form hercynite and pyroxene, and the size and quantity of pores in the sintered samples are greater than those under air conditions. This contributes to its poor mechanical properties. The critical range of the oxygen's partial pressure for the transformation of Fe2+ and its crystals is 0.5% -0.75%. When the partial pressure is less than 0.5%, a black or brown ceramic sample can be obtained and is mainly composed of hercynite and pyroxene. When the partial pressure exceeds 0.75%, Fe2+ begins to oxidize to Fe3+, hematite begins to form gradually, and its color changes from a brown or brownish red color. Increasing oxygen partial pressure in the sintering environment is an effective way for avoiding black core in the sintered steel slag brick. |
| format | Article |
| id | doaj-art-c5672ab3c902440a93c7732fa3f956e2 |
| institution | OA Journals |
| issn | 2095-9389 |
| language | zho |
| publishDate | 2018-03-01 |
| publisher | Science Press |
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| series | 工程科学学报 |
| spelling | doaj-art-c5672ab3c902440a93c7732fa3f956e22025-08-20T01:47:55ZzhoScience Press工程科学学报2095-93892018-03-0140334034810.13374/j.issn2095-9389.2018.03.010Influence of sintering atmosphere on crystals and performance of slag ceramicsLI Yu0WANG Yao-zhong1WANG Ya-kun2State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaThe preparation of ceramic materials is a new way of utilizing steel slag. It is important to investigate the influence of different sintering atmosphere on steel slag ceramics, which is of great significance in promoting the application of steel slag ceramic technology. In this paper, 20% of steel slag and 80% of clay were used as the main raw materials under different atmospheres, namely, air and nitrogen, and were prepared into steel slag ceramic bricks. The ceramic bricks'crystal phase evolvement and performance were analyzed, and the effect of partial oxygen pressure on the oxidation of Fe2+ in the steel slag ceramics was investigated quantitatively. The results show that under air conditions, the Fe2+ in raw materials is oxidized to form the hematite phase, and the compressive strength and water absorption of sintered samples were 310 MPa and 3.7%, respectively, which is better than those of sintered samples under nitrogen conditions. Under nitrogen condition, the Fe2+ in the raw material is kept unchanged to form hercynite and pyroxene, and the size and quantity of pores in the sintered samples are greater than those under air conditions. This contributes to its poor mechanical properties. The critical range of the oxygen's partial pressure for the transformation of Fe2+ and its crystals is 0.5% -0.75%. When the partial pressure is less than 0.5%, a black or brown ceramic sample can be obtained and is mainly composed of hercynite and pyroxene. When the partial pressure exceeds 0.75%, Fe2+ begins to oxidize to Fe3+, hematite begins to form gradually, and its color changes from a brown or brownish red color. Increasing oxygen partial pressure in the sintering environment is an effective way for avoiding black core in the sintered steel slag brick.http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2018.03.010steel slag ceramicssintering atmospherefe2+crystal phase transformationoxygen partial pressureblack core |
| spellingShingle | LI Yu WANG Yao-zhong WANG Ya-kun Influence of sintering atmosphere on crystals and performance of slag ceramics 工程科学学报 steel slag ceramics sintering atmosphere fe2+ crystal phase transformation oxygen partial pressure black core |
| title | Influence of sintering atmosphere on crystals and performance of slag ceramics |
| title_full | Influence of sintering atmosphere on crystals and performance of slag ceramics |
| title_fullStr | Influence of sintering atmosphere on crystals and performance of slag ceramics |
| title_full_unstemmed | Influence of sintering atmosphere on crystals and performance of slag ceramics |
| title_short | Influence of sintering atmosphere on crystals and performance of slag ceramics |
| title_sort | influence of sintering atmosphere on crystals and performance of slag ceramics |
| topic | steel slag ceramics sintering atmosphere fe2+ crystal phase transformation oxygen partial pressure black core |
| url | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2018.03.010 |
| work_keys_str_mv | AT liyu influenceofsinteringatmosphereoncrystalsandperformanceofslagceramics AT wangyaozhong influenceofsinteringatmosphereoncrystalsandperformanceofslagceramics AT wangyakun influenceofsinteringatmosphereoncrystalsandperformanceofslagceramics |