方莹,李镇,徐传达.表面机械活化粉煤灰提取氧化铝及其动力学研究[J].表面技术,2012,(4):80-83.
FANG Ying,LI Zhen,XU Chuan-da.Research on the Kinetics of Extraction of Al2O3 from Fly Ash Treated by Surface Mechanical Activation[J].Surface Technology,2012,(4):80-83 |
| 表面机械活化粉煤灰提取氧化铝及其动力学研究 |
| Research on the Kinetics of Extraction of Al2O3 from Fly Ash Treated by Surface Mechanical Activation |
| 投稿时间：2012-03-22 修订日期：2012-08-20 |
| DOI： |
| 中文关键词: 粉煤灰 机械活化 氧化铝 动力学 |
| 英文关键词:fly ash mechanical activation alumina kinetics |
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| 中文摘要: |
| 采用高能球磨活化粉煤灰,并对球级配、球料比、转速以及球磨时间进行正交试验,将经不同时间活化的粉煤灰与Na2CO3 按一定比例煅烧溶出,得到Al2O3。通过测试分析,研究了高能球磨活化各工艺参数对Al2O3 溶出率的影响,得到了最优化工艺条件,并对Al2O3 溶出过程的动力学进行了验证分析。结果表明:当表面机械活化6h、溶出温度90 ℃、液固比L/S=6、硫酸浓度4mol/L时,效益最高;此反应属于收缩未反应芯模型,表观活化能为60.87kJ/mol,反应级数为0.1701。 |
| 英文摘要: |
| The fly ash was activated by high enery ball milling, and the ball gradation, ball/powder weight ratio, rotate speed and milling time were treated by orthogonal experiment. The Al2O3 was obtained by calcined with a percentage of fly ash activated with different time and Na2CO3. The effect of surface mechanical activation on extraction rate of Al2O3 was tested and analyzed, and finally the most optimized parameter and the kinetics of the extraction processes were found out. The results show that, the extraction of Al2O3 reached 91.15% when the surface mechanical activation time is 6 h with L/S = 6, and the acid concentration 4 mol/L at the leaching temperature 90℃. The reaction can be described by shrinking core model and the activation energy is 60.87 kJ/mol while the reaction order is 0.1701. |
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