在 Fe2 O3试剂中添加CeO2制成压团试样，对其进行预热及焙烧，利用 X射线衍射、DSC和 SEM相结合的方法，研究CeO2含量对试样抗压强度的影响机理。结果表明，在975℃预热压团中形成了Ce-Fe-O 固溶体，使Fe2 O3晶粒间的连接增强，预热压团强度增大；在1250℃焙烧压团中Ce-Fe-O 固溶体发生了脱溶和分解，析出的高熔点氧化物CeO2存在于 Fe2 O3晶粒间，阻碍了 Fe2 O3晶粒之间的连晶生长，使焙烧压团的强度随 CeO2含量增多而降低。
By means of briquetting-preheating-roasting,Fe2 O3 briquette samples containing CeO2 were prepared. The mechanism of the influence of CeO2 content on the compressive strength of briquette samples was analyzed by X-ray diffraction(XRD),differential scanning calorimetry (DSC)and scanning electron microscopy (SEM).The results show that the Ce-Fe-O solid solution is formed in briquette samples preheated at 975℃,which promotes the connection of Fe2 O3 grains and enhances the compressive strength of preheated briquettes.The Ce-Fe-O solid solution decomposes in briquette samples roasted at 1 250℃,and CeO2 with high-melting-point distributes be-tween Fe2 O3 grains which hinder the growth of Fe2 O3 crystal stocks.Therefore,the compressive strength of the roasted briquettes decreases with increasing the CeO2 content.
参考文献
| [1] | 罗果萍;张国成;刘吉涛;尚春江;王茂峰;吴胜利.提高链篦机-回转窑氧化球团预热球抗压强度的工艺优化[J].钢铁研究学报,2013(12):13-16,22. |
| [2] | 范晓慧;王祎;甘敏;袁礼顺;代林晴;赵改革.提高有机粘结剂氧化球团矿强度的措施[J].钢铁研究学报,2008(5):5-8,19. |
| [3] | 许满兴.论新世纪球团矿的质量进步[J].烧结球团,2000(06):1-3,4. |
| [4] | 韩淑霞;刘铃声.稀土对烧结矿质量的影响研究[J].稀土,2010(4):88-91. |
| [5] | 韩淑霞.稀土在烧结过程中的行为研究[J].稀土,2011(01):54-58. |
| [6] | F.J.Perez-Alonso;M.Lopez Granados;M.Ojeda.Relevance in the Fischer-Tropsch Synthesis of the Formation of Fe-O-Ce Interactions on Iron-Cerium Mixed Oxide Systems[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,200647(47):23870-23880. |
| [7] | Lv H;Tu HY;Zhao BY;Wu YJ;Hu KA.Synthesis and electrochemical behavior of Ce1-xFexO2-delta as a possible SOFC anode materials[J].Solid state ionics,200726(26):3467-3472. |
| [8] | Tianshu Zhang;Peter Hing;Haitao Huang.Densification, microstructure and grain growth in the CeO_2-Fe_2O_3 system (0 <= Fe/Ce <=20 percent)[J].Journal of the European Ceramic Society,200112(12):2221-2228. |
| [9] | ANDREW R. FIRTH;JOHN F. GARDEN.Interactions between Magnetite Oxidation and Flux Calcination during Iron Ore Pellet Induration[J].Metallurgical and Materials Transactions, B. Process metallurgy and materials processing science,20084(4):524-533. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%