New Process for Preparation Alumina and Silica White from Coal Fly Ash

被引：0

作者：

JIN Xinliang ^{[1
]}

PENG Tongjiang ^{[2
]}

机构：

[1] Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,SWUST

[2] Institute of Mineral Materials &

来源：

矿物学报 | 2013年 / 33(S1)卷 / S1期

关键词：

coal fly ash; ammonium sulphate calcining method; acid leaching; alkali dissolution; alumina; silica white;

D O I：

10.16461/j.cnki.1000-4734.2013.s1.066

中图分类号：

TD982 [有色及贵重金属矿产]; X705 [固体废物的处理与利用];

学科分类号：

摘要：

Fly ash was used to prepare alumina and silica white, The 3 stages of the process are as follows: ammonium sulfate calcining, acid leaching and alkali dissolution. The optimum conditions for the experiments to determine are as follows: molar ratio of (NH4)2SO4/Al2O3 is 6, the calcining time is 2h, he H2SO4 concentration is 20%, the leaching temperature is 80℃ and dissolution duration is 2h, the ratio of solution and solid reaction material is 6 for ammonium sulfate calcining and acid leaching stage, reaction time 30min, ratio of liquid to ore 5∶1, alkali concentration 45% and reaction temperature 95 ℃for the alkali dissolution stage. Under these conditions, the total leaching efficiencies of Al2O3 and SiO2 are 78.86% and 95%, respectively. The quality of the main products alumina and silica white can meet the national standards of GB/T24487-2009 and GB10517-89, respectively.

引用

页码：38 / 38

页数：1