高铝粉煤灰碳酸钠焙烧与酸浸提铝的动力学  

Kinetics of Roasting of High Aluminum Content Coal Fly Ash with Sodium Carbonate and Acid Leaching for Extraction of Aluminum

作　　者：刘能生[1,2] 彭金辉[1,2] 张利波[1,2] 蔺琎[2,3] 

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093 [2]微波能工程应用及装备技术国家地方联合工程实验室,云南昆明650093 [3]昆明理工大学工程训练中心,云南昆明650500

出　　处：《过程工程学报》2016年第2期216-221,共6页The Chinese Journal of Process Engineering

基　　金：国家级超硬材料先进制备技术国际联合研究中心资助项目(编号:2013B01038)

摘　　要：以内蒙古高铝粉煤灰(Al_2O_3/SiO_2质量比1.24)为原料,采用Na_2CO_3焙烧活化-盐酸浸取法提铝,考察了焙烧温度、时间和碳酸钠/粉煤灰质量比的影响,对焙烧活化及酸浸提铝动力学进行研究,分析了提铝机理.结果表明,高温活化条件下,粉煤灰中的莫来石及SiO_2与Na_2CO_3反应生成NaAlSiO_4,Al_2O_3和Na_2SiO_3,酸浸后铝浸出率超过94.99%;活化过程符合Crank-Ginstling-Braunshtein模型,表观活化能为117.06kJ/mol,活化反应受固膜扩散控制.High aluminum content coal fly ash（CFA） from Inner Mongolia was roasted with Na2CO3, and the roasted material leached by HCl solution for extraction of aluminum. The effects of roasting temperature and time, and mass ratio of Na2CO3 to CFA on the leaching rate of aluminum were examined. The process kinetics and mechanisms of roasting and acid leaching were analyzed. The results showed that at high roasting temperature, the reaction of mullite（Al6Si2O（13）） and SiO2 in CFA with Na2CO3 resulted in formation of NaAlSiO4, Al2O3 and Na2 Si O3, which could be dissolved in HCl solution. After acid leaching, the leaching rate of aluminum reached more than 94.99%. The Crank-Ginstling-Braunshtein model could be used to correlate the experimental data of roasting process, and the apparent activation energy was calculated as 117.06 k J/mol. The reaction rate was controlled by solid-film diffusion.

关 键 词：高铝粉煤灰 碳酸钠 焙烧 碱活化 酸浸 动力学 

分 类 号：TF821[冶金工程—有色金属冶金]