硅酸盐通报2017，Vol.36Issue(10)：3385-3391,7.
石英砂高温焙烧-酸洗除铁动力学研究
Kinetics of Silica Sand Purification by Roasting-Acid Leaching
摘要
Abstract
A method for removing iron impurity from silica sand by roasting and acid leaching was proposed .The optimum holding time is 180 min under the roasting temperature of 900 ℃.The iron content in silica sand with roasting is 34.61 μg/g, the removal rate is 88.3％after acid leaching under conditions:acid leaching temperature is 90 ℃, leaching time is 360 min.The silica sand was analyzed by SEM, the corresponding result showed that there are many cracks and corrosion pits on the surface of the silica sand particles after roasting , which contributed to removing of Fe impurity .Kinetics analysis reveals that the product layer diffusion in heterogeneous reaction system is the rate-controlling step . Compared to the one without roasting , the acid leaching after roasting reacts more quickly , the iron content and the activation energy are lower .The activation energy is 30.88 kJ/mol after roasting for 900℃, holding 180 min compared with 36 .18 kJ/mol without roasting , and it reduce 17 .2％after roasting . It showed that roasting will promote the acid leaching reaction .关键词
石英砂/焙烧/酸洗/Fe杂质/未反应核模型Key words
silica sand/roasting/acid leaching/iron impurity/shrinking core model分类
化学化工引用本文复制引用
刘加威,李京伟,白枭龙,班伯源,孙继飞,陈健..石英砂高温焙烧-酸洗除铁动力学研究[J].硅酸盐通报,2017,36(10):3385-3391,7.基金项目
国家自然科学基金(51474201,51404231) （51474201,51404231）
安徽省自然科学基金(1508085QE81) （1508085QE81）
支持"率先行动"中国博士后科学基金会与中国科学院联合资助优秀博士后项目(2016LH0017) （2016LH0017）
中科院"百人计划"项目(2012065) （2012065）
