摘要
对NH4HSO4焙烧粉煤灰所得熟料溶出过程的动力学进行研究，确定了溶出温度、搅拌强度及溶出液固比对熟料中铝溶出率的影响。结果表明，溶出过程受外扩散控制，可以分为两个阶段：0～20min为第一阶段，20～60min为第二阶段，相应的反应活化能分别为8．013kJ／mol和4．973kJ／mol。在溶出温度90℃、搅拌强度300r／min，液固比9：1，溶出时间60min的条件下，铝溶出率可达93％。
The digestion kinetics of sintered clinker to extract alumina from fly ash with ammonium hydro- gen sulfate roasting process was investigated. The effects of temperature, stirring intensity and mass ratio of liquid to solid （L/S） on aluminum dissolution rate were studied. The results show that digestion process is controlled by external diffusion. The digestion process includes the first stage for 0-20 min, and the second stage for following 20-60 min. The activation energies of the two stages are 8. 013 kJ/mol and 4. 973 kJ/mol respectively. The aluminum dissolution rate reaches 93% under the optimal conditions inclu- ding temperature of 90℃, stirring intensity of 300 r/min, L/S of 9 ： 1 and duration of 60 min.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2013年第9期22-25,30,共5页
Nonferrous Metals（Extractive Metallurgy)
基金
国家重点基础研究发展计划项目(2007CB613603)
关键词
硫酸氢铵
焙烧
粉煤灰
溶出过程
动力学
活化能
ammonium hydrogen sulfate
roasting
fly ash
digestion process
kinetics
activation energy
