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Thesis Advisor段东平 ; 钟莉
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Discipline化学工程
Keyword砂状介孔氧化铝 可控合成 机理 含氟烟气净化

电解铝行业释放的大量含氟烟气会对环境和人类、动物的生长造成严重的损害,因而有效净化含氟烟气具有重要的意义。目前普遍使用砂状氧化铝干法净化含氟烟气。砂状氧化铝粒度大且均匀、流动性和电解性能好,但净化效率难以满足不断提高的国家环保要求;而介孔氧化铝比表面积大、孔道结构有序、反应活性更高,对含氟烟气的化学吸附净化性能更高,具有良好的工业应用前景。而另一方面,缺乏结构可控、低成本的合成方法也是制约介孔氧化铝材料发展和工业化应用的主要障碍。为解决上述问题,本研究采用廉价易得的过饱和铝酸钠为铝源,可重复利用的温敏凝胶MC为模板剂,通过与碳酸氢钠反应结晶,合成出兼具介孔氧化铝和砂状氧化铝性能的砂状介孔氧化铝新型材料;研究合成条件对其结构与性能的影响,揭示合成机理;将合成出的砂状介孔氧化铝应用于含氟烟气的净化,测试其净化效果。本研究得到的新型材料兼具砂状氧化铝和介孔氧化铝的特点:颗粒是由六棱柱状的微晶沿半径方向外延生长的团聚体,粒度分布均匀且平均粒径在80μm 左右;孔道为蠕虫洞状。改变结晶温度可以调节孔径的大小和强度、热稳定性和水热稳定性良好;砂状介孔氧化铝介孔结构的生成机理为“液晶模板机理”;对模拟含氟烟气的吸附效果良好,为其在工业含氟烟气净化过程中的应用奠定了基础。 

Other Abstract

Fluoride gas released from electrolytic alumina industry is seriously harmful to the environment and human and animals, thus it’s important to purify the fluoride gas. At present, the technology of purifying the fluoride gas is the dry purification using sandy alumina as adsorbent. Sandy alumina with uniform large size, excellent mobility and electrolytic performance, but its purification efficiency is not enough to meet the increasing requirements of national environmental protection. And mesoporous alumina with large surface area, ordered pore structure, higher reactivity, higher performance in purification of fluorine flue gas, which has good prospects for industrial applications. In addition, the lack of synthesis method for controlled structure and low cost of mesoporous alumina is also a main obstacle restricting the development of mesoporous alumina materials and its industrial applications.In order to resolve the problems mentioned above, lost cost inorganic preparation method for sandy-mesoporous alumina abbreviated as SMA with the characteristics of both sandy alumina and mesoporous alumina, was proposed. In this research, the process for the controllable synthesis of sandy mesoporous alumina using supersaturated sodium alumina as alumina recourse, applying temperature-sensitive intelligent gel MC-which is easy to be removed and recycled to reuse as the template, and using sodium bicarbonate to decomposite the supersaturated sodium alumina solution to prepare the SMA material was investigated. Furthermore, the mechanism of this process was also investigated. Then SMA was used to purify fluoride gas to test the absorption property and purification effect of the material. The obtained SMA was characterized as γ-Al2O3, and the spherical particles of SMA were aggregated by hexagonal prism crystallites along the radius direction. The particle size distribution of SMA material was uniform and the average particle size was about 80μm. The SMA short-range has ordered pore structure and stable thermal stability and hydrothermal stability. The formation mechanism of SMA mesoporous structure can be attributed to the classical "liquid crystal template mechanism". The excellent effect of SMA for simulated fluoride gas purification of SMA provided the basis for the application as absorbent to purify fluoride flue gas in industry. 

Document Type学位论文
Recommended Citation
GB/T 7714
陈天华. 基于含氟烟气净化的砂状介孔氧化铝的应用基础研究[D]. 北京. 中国科学院研究生院,2016.
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