科研之友
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摘要
We determined the optimum activation conditions and formation mechanism of activated clay prepared using a waste acid recycling method. The aim of this study was to determine the effect of the processes used on the quality of the activated clay. Key objectives were to optimize operating conditions and to determine the mechanism of acid treatment. Results of single-factor experiments showed the following optimum conditions: sulfuric acid concentration of 22%, liquid-solid ratio of 3.5, and 4 h reaction time at 90 degrees C. Under these conditions, the performance of activated clay appears to be much better than that prepared using the traditional method. Compared with the traditional method, the waste acid recycling process consumed less sulfuric acid (up to 21%) and the amount of aluminum released during the activation processes was also lower. Improvement in clay quality was due to the presence of several types of sulfate residue in the waste acid, preventing further dissolution of the crystal structure of montmorillonite. This improved structure uniformity resulted in an activated clay with better performance. Moreover, the waste acid recycle method reduces the environmental impact and pollution due to acid reuse.
- 出版日期2010-6
- 单位广西大学
