文章信息/Info

Title:

New technology of preparing high purity alumina with coal fly as raw

作者:

吳玉勝; 張麗麗; 王宏濤; 馮鑫

沈陽工業大學 材料科學與工程學院

Author(s):

Yusheng Wu;  Lili Zhang;  Hongtao Wang;  Xin Feng

College of Materials Science and Engineering, Shenyang University of Technology

關鍵詞:

粉煤灰; 硫酸氫銨; 碳酸鋁銨; 氧化鋁; 浸出; 重結晶

Keywords:

fly ash;  ammonium hydrogen sulfate;  ammonium aluminum carbonate;  alumina; leaching; recrystallization

DOI:

10.7502/j.issn.1674-3962.2017.03.06

文獻標志碼:

A

摘要:

粉煤灰是火力發電廠排放的固體廢棄物，實現高鋁粉煤灰的高附加值利用是行業的研究熱點。本文研究了硫酸氫銨溶液浸出粉煤灰制備高純氧化鋁的工藝技術，結合掃描電子顯微鏡（SEM）、X-衍射分析(XRD)等手段對獲得的產物進行了表征。結果表明，通過調整相應的工藝參數可獲得片狀、條狀等形貌的氧化鋁前軀體產物。前軀體在500 °C條件下煅燒4 h可獲得比表面積為571.32 m2/g、 孔體積為 0.75 cm3/g 、孔徑尺寸為 6.15 nm的介孔氧化鋁。隨著煅燒溫度的升高，氧化鋁顆粒趨于球形轉變。經1200°C煅燒形成的氧化鋁粒徑大約為60 nm，純度≥99.92%。獲得的氧化鋁產品可用做催化劑載體材料、復合材料、精細陶瓷等領域。

Abstract:

Coal fly ash is the major coal solid waste in thermal power plants. Extracting of aluminum from coal fly ash is environmentally and scientifically significant for disposing and utilizing waste materials and exploring new aluminum source, and has attracted extensive attention recently. A new technology of preparing high purity alumina by leaching fly ash with ammonium hydrogen sulfate aqueous is introduced. The characterization of following products was carried by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption-desorption method Field emission scanning electron microscopy (SEM) and. The results show that the alumina precursor with discs or strip morphology can be obtained by controlling the corresponding technological parameters. The mesoporou γ-Al2O3 obtained by calcining AACH at 500 °C for 4 h exhibits high specific surface area of 571.32 m2/g, a pore volume of 0.75 cm3/g and pore size of 6.15 nm. Alumina particles transform to the spherical shape with increasing calcining temperature. The alumina with particle size in diameter about 60 nm and purity not less 99.92% is obtained by calcining AACH at 1200°C for 2h. The so called alumina product may be used as catalyst carrier material, composite material, fine ceramics and other aspects.