以纯化合物和高岭土为原料，研究Fe2O3?SiO2?Al2O3三元系还原烧结过程中Fe2O3的反应行为。热力学计算分析和还原烧结实验结果表明，在还原性碳气氛中，1173 K下Fe2O3被还原后得到的FeO能分别与SiO2和Al2O3反应生成硅酸亚铁和铝酸亚铁。对于 Fe2O3?SiO2?Al2O3三元系，在还原性气氛条件下，Fe2O3还原后形成的FeO将优先与Al2O3反应形成铝酸亚铁，只有当体系中Al2O3反应完全后还存在过量的FeO时，SiO2才能与FeO反应形成硅酸亚铁。当烧结温度继续升高到1473 K时，三元系中形成的铝酸亚铁将进一步与体系中的SiO2反应生成莫来石和FeO。研究结果有望为氧化铝生产过程中低A/S比含铁原料的铝硅分离提供新的思路。
Pure compounds and kaolin were employed to investigate the reaction behavior of ferric oxide in thetrinarysystem Fe2O3?SiO2?Al2O3 during reductive sintering process. The thermodynamic analyses and reductive sintering experimental results show that ferrous oxide generated from the reduction of ferric oxide by carbon can react with silicon dioxide and aluminum oxide to form ferrous silicate and hercynite at 1173 K, respectively. In the trinary system Fe2O3?SiO2?Al2O3, ferrous oxide obtained from ferric oxide reduction preferentially reacts with aluminum oxide to form hercynite, and the reaction of ferrous oxide with silicon dioxide occurs only when there is surplus ferrous oxide after the exhaustion of aluminum oxide. When sintering temperature rises to 1473 K, hercynite further reacts with silicon dioxide to form mullite and ferrous oxide. Results presented in this work may throw a new light upon the separation of alumina and silica present in Al/Fe-bearing materials with low mass ratio of alumina to silica in alumina production.
参考文献
| [1] | GAO Shu-ling;LI Xia-an;WEI De-zhou;FANG Ping;JIA Chun-yun;LIU Wen-gang;HAN Cong.Beneficiation of low-grade diasporic bauxite with hydrocyclone[J].中国有色金属学会会刊（英文版）,2008(02):444-448. |
| [2] | 张伦和;何静华;张颖.我国氧化铝工业现状及发展对策[J].轻金属,2006(2):3-7. |
| [3] | 杨权成;马淑花;谢华;张然;郑诗礼.高铝粉煤灰提取氧化铝的研究进展[J].矿产综合利用,2012(3):3-7. |
| [4] | Extraction of alumina and sodium oxide from red mud by a mild hydro-chemical process[J].Journal of hazardous materials,20092/3(2/3):1629. |
| [5] | B. Mishra;A. Staley;D. Kirkpatrick.Recovery of value-added products from red mud[J].Minerals & Metallurgical Processing,20022(2):87-94. |
| [6] | Ercag E;Apak R.Furnace smelting and extractive metallurgy of red mud: Recovery of TiO2, Al2O3 and pig iron[J].Journal of Chemical Technology & Biotechnology,19973(3):241-246. |
| [7] | K. Snars;R.J. Gilkes.Evaluation of bauxite residues (red muds) of different origins for environmental applications[J].Applied clay science,20091(1):1-6. |
| [8] | Fois E;Lallai A;Mura G.Sulfur dioxide absorption in a bubbling reactor with suspensions of Bayer red mud[J].Industrial & Engineering Chemistry Research,200721(21):6770-6776. |
| [9] | Liu YanJu;Ravi Naidu;Ming Hui.Red mud as an amendment for pollutants in solid and liquid phases.[J].Geoderma: An International Journal of Soil Science,20111/2(1/2):1-12. |
| [10] | Gupta VK.;Sharma S.;Gupta M..Process development for the removal of lead and chromium from aqueous solutions using red mud - an aluminium industry waste[J].Water research: A journal of the international water association,20015(5):1125-1134. |
| [11] | BAI Guang-hui;TENG Wei;WANG Xiang-gang;QIN Jin-guo;XU Peng;LI Peng-cheng.Alkali desilicated coal fly ash as substitute of bauxite in lime-soda sintering process for aluminum production[J].中国有色金属学报（英文版）,2010(z1):169-175. |
| [12] | 李小斌;张志强;刘伟;刘桂华;彭志宏;周秋生.Na2O-Al2O3-Fe2O3系烧结过程中铝、铁的反应行为[J].过程工程学报,2009(5):877-881. |
| [13] | 张君博;张刚;肖国庆.铁铝尖晶石的制备[J].硅酸盐通报,2007(5):1003-1006. |
| [14] | Botta PM.;Bercoff PG.;Aglietti EF.;Bertorello HR.;Lopez JMP..Magnetic and structural study of mechanochemical reactions in the Al-Fe3O4 system[J].Journal of Materials Science,200212(12):2563-2568. |
| [15] | 刘莉;马宏相;吕剑明.NaCl和NaOH对石英晶型转化的作用效果对比研究[J].广州化工,2013(19):49-51. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%