Deposit Formation in a Coal-Fired Rotary Kiln for Fluxed Iron Ore Pellet Production: Effect of MgO Content
During the roasting process of fluxed pellets in a coal-fired rotary kiln, the incomplete combustion of pulverized coal injection accelerates deposit formation, which further limits the production efficiency of fluxed pellets. In order to eliminate the above problem, this study investigated the infl...
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MDPI AG
2022-08-01
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| Online Access: | https://www.mdpi.com/2073-4352/12/9/1214 |
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| author | Yufeng Guo Kuo Liu Shuai Wang Feng Chen Zhuang Yang Lingzhi Yang Dongyue Li |
| author_facet | Yufeng Guo Kuo Liu Shuai Wang Feng Chen Zhuang Yang Lingzhi Yang Dongyue Li |
| author_sort | Yufeng Guo |
| collection | DOAJ |
| description | During the roasting process of fluxed pellets in a coal-fired rotary kiln, the incomplete combustion of pulverized coal injection accelerates deposit formation, which further limits the production efficiency of fluxed pellets. In order to eliminate the above problem, this study investigated the influence of MgO on deposit formation mechanism. The thermodynamic analysis revealed that MgO could increase the melting temperature of silicates in fluxed pellets with 0.8–1.2 basicity (CaO/SiO<sub>2</sub>) when roasted at 1200–1250 °C, thereby decreasing the amount of liquid phase that formed initial deposits. XRD and SEM analyses of deposit simulants demonstrated that the addition of MgO was conducive to form magnesium magnetite and ferri-diopside, thereby avoiding the formation of hedenbergite with lower melting temperature. Moreover, the softening-melting performance and adhesivity tests confirmed that MgO had a positive effect on reducing liquid-phase deposition and inhibiting the adhesion of deposits on refractory bricks below 1250 °C. The above studies indicated that the addition of MgO helped to slow down the deposit formation of fluxed pellets prepared by coal-fired rotary kiln. |
| first_indexed | 2024-03-10T00:20:38Z |
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| id | doaj.art-31fad510b260484c9bb13a081017771b |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T00:20:38Z |
| publishDate | 2022-08-01 |
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| spelling | doaj.art-31fad510b260484c9bb13a081017771b2023-11-23T15:43:20ZengMDPI AGCrystals2073-43522022-08-01129121410.3390/cryst12091214Deposit Formation in a Coal-Fired Rotary Kiln for Fluxed Iron Ore Pellet Production: Effect of MgO ContentYufeng Guo0Kuo Liu1Shuai Wang2Feng Chen3Zhuang Yang4Lingzhi Yang5Dongyue Li6School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaDuring the roasting process of fluxed pellets in a coal-fired rotary kiln, the incomplete combustion of pulverized coal injection accelerates deposit formation, which further limits the production efficiency of fluxed pellets. In order to eliminate the above problem, this study investigated the influence of MgO on deposit formation mechanism. The thermodynamic analysis revealed that MgO could increase the melting temperature of silicates in fluxed pellets with 0.8–1.2 basicity (CaO/SiO<sub>2</sub>) when roasted at 1200–1250 °C, thereby decreasing the amount of liquid phase that formed initial deposits. XRD and SEM analyses of deposit simulants demonstrated that the addition of MgO was conducive to form magnesium magnetite and ferri-diopside, thereby avoiding the formation of hedenbergite with lower melting temperature. Moreover, the softening-melting performance and adhesivity tests confirmed that MgO had a positive effect on reducing liquid-phase deposition and inhibiting the adhesion of deposits on refractory bricks below 1250 °C. The above studies indicated that the addition of MgO helped to slow down the deposit formation of fluxed pellets prepared by coal-fired rotary kiln.https://www.mdpi.com/2073-4352/12/9/1214magnesiumfluxed pelletdepositpulverized coalrotary kiln |
| spellingShingle | Yufeng Guo Kuo Liu Shuai Wang Feng Chen Zhuang Yang Lingzhi Yang Dongyue Li Deposit Formation in a Coal-Fired Rotary Kiln for Fluxed Iron Ore Pellet Production: Effect of MgO Content Crystals magnesium fluxed pellet deposit pulverized coal rotary kiln |
| title | Deposit Formation in a Coal-Fired Rotary Kiln for Fluxed Iron Ore Pellet Production: Effect of MgO Content |
| title_full | Deposit Formation in a Coal-Fired Rotary Kiln for Fluxed Iron Ore Pellet Production: Effect of MgO Content |
| title_fullStr | Deposit Formation in a Coal-Fired Rotary Kiln for Fluxed Iron Ore Pellet Production: Effect of MgO Content |
| title_full_unstemmed | Deposit Formation in a Coal-Fired Rotary Kiln for Fluxed Iron Ore Pellet Production: Effect of MgO Content |
| title_short | Deposit Formation in a Coal-Fired Rotary Kiln for Fluxed Iron Ore Pellet Production: Effect of MgO Content |
| title_sort | deposit formation in a coal fired rotary kiln for fluxed iron ore pellet production effect of mgo content |
| topic | magnesium fluxed pellet deposit pulverized coal rotary kiln |
| url | https://www.mdpi.com/2073-4352/12/9/1214 |
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