JIN Xin-liang1, PENG Tong-jiang1,2, SUN Hong-juan2
(1. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China;
2. Institute of Mineral Materials & Application, Southwest University of Science and Technology, Mianyang 621010, China)
Abstract: This paper is based on the extraction of alumina from coal fly-ash, using the raw material of coal fly ash and ammonium sulfate additives, which are calcined and then the easy leaching aluminum ammonium sulfate is formed. The calcination reaction products were characterized by means of TG-DTA and XRD, exploring the effects of the additives added, calcining temperature and calcining time on calcined products. The results show that Al2O3 in the coal fly ash released in the form of aluminum ammonium sulfate through adding ammonium sulfate; While n(Al2O3) : n([NH4]2SO4)=1:6, mullite phase of the coal fly ash decomposed completely; but the roasting time is longer than 1.5 h, and the corresponding calcined product phase is mainly aluminum ammonium sulfate. Raising temperature is beneficial to formation aluminum ammonium sulfate.
Key words: solid waste; coal fly ash; ammonium sulfate; roasting; ammonium aluminum sulfate
E-mail: xinyu2010.love@163.com
ACTA MINERALOGICA SINICA Vol. 33, No. 2, 2013, Page 147-152
