摘要
以铝电解槽废旧阴极为研究对象,针对两步浸出法工艺,用收缩核模型研究了碱浸出后的废旧阴极内衬固体用HCl溶液浸出NaAl11O17动力学。考察了粒径大小、不同温度和搅拌速度对浸出率的影响,并建立了反应的动力学方程。结果表明,该浸出反应的控制环节为内扩散,反应表观活化能为18.26 kJ/mol。生产中最佳工艺条件为:浸出温度85℃、搅拌速度600 r/min、粒径0.075 mm。该工作为铝电解槽废旧阴极内衬规模化利用打下了坚实的基础。
Taking spent pot linings as research object,the leaching kinetics of NaAl11O17 in spent pot linings leached by alkaline was studied with the shrinking cole model for a two-step leaching process. Effects of particle size,leaching temperature and stirring speed on NaAl11O17 conversion rate in the spent pot lining were investigated,and kinetic equations were presented. The results showed that the leaching process is controlled by interior diffusion,and the kinetic apparent activation energy is 18. 26 kJ /mol. The optimum technological conditions for production are the leaching temperature of 85℃,the stirring speed of 600 r /min and the particle size of0. 075 mm. This work is useful for recycling the spent pot lining on a large scale.
出处
《环境工程学报》
CAS
CSCD
北大核心
2014年第11期4998-5002,共5页
Chinese Journal of Environmental Engineering
基金
河南省科技攻关项目(201224321)
