在600～750℃的温度范围、空气气氛下焙烧攀枝花钛铁矿,通过观察分析钛铁矿氧化后的微观形貌、物相组成以及氧化动力学,对钛铁矿的氧化机理进行了详细地研究.试验结果表明钛铁矿的氧化机制是一种Fe、O离子相互竞争扩散的反应机制.在反应初期,钛铁矿的氧化是通过Fe离子的向外扩散完成,氧化产物是Fe2O3和Fe2Ti3O9,其中Fe2O3会在颗粒表面富集；当反应进行到一定程度后(表面Fe2O3层厚度达到1～2 μm),O离子的向内扩散在反应中占主导,颗粒内部逐渐形成Fe2O3和TiO2.由于从Fe离子扩散转变到O离子扩散均发生在表面氧化铁层厚度达到1 ～2 μm时,这一转变时间与温度和钛铁矿颗粒粒径无关,所以Fe离子扩散在整个氧化过程中所占的比重会随着钛铁矿颗粒粒径的减小而增大,而O离子扩散则相反.
参考文献
| [1] | Balderson Graham F;Macdonald Charles A .Method for the production of synthetic rutile[P].U.S.Patent:No.5885324 |
| [2] | 肖雅琴.盐酸浸出攀枝花钛铁矿生成金红石机理的研究[J].矿冶工程,1988(01):51-54,59. |
| [3] | 程洪斌,王达健,黄北卫,孙刚.钛铁矿盐酸法加压浸出中人造金红石粉化率的研究[J].有色金属,2004(04):82-85. |
| [4] | Li Zhang;Huiping Hu;Zhi Liao .Hydrochloric acid leaching behavior of different treated Panxi ilmenite concentrations[J].Hydrometallurgy,2011(1/2):40-47. |
| [5] | Sun Kang;Takahashi Reijiro;Yagi Jun-ichiro .Kinetics of the oxidation and reduction of synthetic ilmenite[J].ISIJ International,1993,33:523-528. |
| [6] | Chen Y. .Different oxidation reactions of ilmenite induced by high energy ball milling[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1998(1/2):150-154. |
| [7] | Rao D Bhogeswara;Rigaud M .Kinetics of the oxidation of ilmenite[J].Oxidation of Metals,1975,9:323-341. |
| [8] | Gupta Suresh K;Rajakumar V;Grieveson P .Phase transformations during heating of ilmenite concentrates[J].Metallurgical Transaetions B,1991,22B:711-716. |
| [9] | Guangqing Zhang;O. Ostrovski .Effect of preoxidation and sintering on properties of ilmenite concentrates[J].International Journal of Mineral Processing,2002(4):201-218. |
| [10] | XIAO FU .Phase Transitions and Reaction Mechanism of Ilmenite Oxidation[J].Metallurgical and Materials Transactions, B. Process metallurgy and materials processing science,2010(5):1338-1348. |
| [11] | Briggs Randall A;Sacco Jr Albert .The oxidation of ilmenite and its relationship to the FeO-Fe2O3-TiO2 phase diagram at 1073and 1140 K[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1993,24A:1257-1264. |
| [12] | Jha Animesh;Yoon S J .Formation of titanium carbonitride phases via the reduction of TiO2 with carbon in the presence of nitrogen[J].Journal of Materials Science,1999,34:307-322. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%