Effect of Temperature on Phase and Alumina Extraction Efficiency of the Product from Sintering Coal Fly Ash with Ammonium Sulfate

被引:44
作者
Wu, Yusheng [1 ]
Xu, Ping [1 ]
Chen, Jiao [1 ]
Li, Laishi [2 ]
Li, Mingchun [1 ]
机构
[1] Shenyang Univ Technol, Sch Mat Sci & Engn, Liaoning 110178, Peoples R China
[2] Shenyang Aluminum & Magnesium Engn & Res Inst, Liaoning 110001, Peoples R China
基金
中国国家自然科学基金;
关键词
Coal fly ash; Ammonium sulfate; Sintering temperature; Phase; Alumina extraction efficiency; WASTE-WATER;
D O I
10.1016/j.cjche.2014.09.008
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A new developed technology for extracting alumina from coal fly ash was studied in this paper. In this technology, coal fly ash is first sintered with ammonium sulfate, forming ammonium aluminum sulfate in the resultant product, where alumina can be easily leached without using any strong acid or alkali. The products obtained under different sintering conditions were characterized by X-ray diffractometry. Alumina extraction efficiency of these products was also investigated. The results show that the sintering temperature and time substantially influence the phase composition and alumina extraction efficiency of sintered products, while the heating rate has little influence. The optimal sintering condition is 400 degrees C for 3 h in air with a heating rate of 6 degrees C.min(-1). Under the optimal sintering condition, the alumina extraction efficiency from as-sintered coal fly ash can reach 85% or more. (C) 2014 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
引用
收藏
页码:1363 / 1367
页数:5
相关论文
共 21 条
[1]   A review on the utilization of fly ash [J].
Ahmaruzzaman, M. .
PROGRESS IN ENERGY AND COMBUSTION SCIENCE, 2010, 36 (03) :327-363
[2]   Alkali desilicated coal fly ash as substitute of bauxite in lime-soda sintering process for aluminum production [J].
Bai Guang-hui ;
Teng Wei ;
Wang Xiang-gang ;
Qin Jin-guo ;
Xu Peng ;
Li Peng-cheng .
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 2010, 20 :S169-S175
[3]   Thermal decomposition of coal fly ash by concentrated sulfuric acid and alumina extraction process based on it [J].
Bai, Guanghui ;
Qiao, YunHai ;
Shen, Bo ;
Chen, ShuangLi .
FUEL PROCESSING TECHNOLOGY, 2011, 92 (06) :1213-1219
[4]   A review of the multi-component utilisation of coal fly ash [J].
Blissett, R. S. ;
Rowson, N. A. .
FUEL, 2012, 97 :1-23
[5]   Non-hydrothermal synthesis of mesoporous materials using sodium silicate from coal fly ash [J].
Halina, M. ;
Ramesh, S. ;
Yarmo, M. A. ;
Kamarudin, R. A. .
MATERIALS CHEMISTRY AND PHYSICS, 2007, 101 (2-3) :344-351
[6]   The surface chemistry of leaching coal fly ash [J].
Iyer, R .
JOURNAL OF HAZARDOUS MATERIALS, 2002, 93 (03) :321-329
[7]   Leaching behaviour of elements from coal combustion fly ash: An overview [J].
Izquierdo, Maria ;
Querol, Xavier .
INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2012, 94 :54-66
[8]  
Ji Huiming, 2007, Journal of the Chinese Ceramic Society, V35, P1657
[9]  
Li LS, 2012, LIGHT MET, P215
[10]   Extraction of alumina from coal fly ash generated from a selected low rank bituminous South African coal [J].
Matjie, RH ;
Bunt, JR ;
van Heerden, JHP .
MINERALS ENGINEERING, 2005, 18 (03) :299-310