Key Laboratory of Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, China.
Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430073, China.
Ultrason Sonochem. 2017 Mar;35(Pt A):304-312. doi: 10.1016/j.ultsonch.2016.10.006. Epub 2016 Oct 12.
The leaching kinetics of K-feldspar in HSO-CaF system with the assistant of ultrasound was investigated. The effects of various factors, such as sulfuric acid concentration, liquid-to-solid ratio, CaF dosage and leaching temperature were comprehensively studied. The dissolution fraction of potassium can reach more than 83% under the optimum operation conditions with ultrasound. Because of the cavitation effect, the intensified effect with ultrasound has more obvious at lower temperature than higher temperature. The leaching kinetics of K-feldspar with and without ultrasound was successfully modeled by a classic shrinking core model with the product layer diffusion as the rate-controlling step. The activation energies over the temperature range from 60 to 90°C with and without ultrasound were found to be 55.67kJmol and 72.33kJmol, respectively. It was found that the rate constant increases greatly in the presence of ultrasound due to the decreased apparent activation energy, resulting in the improved dissolution fraction of potassium.
研究了超声辅助下 HSO-CaF 体系中钾长石的浸出动力学。综合研究了硫酸浓度、液固比、CaF 用量和浸出温度等各种因素的影响。在最佳操作条件下，超声作用下钾的溶解分数可达到 83%以上。由于空化作用，超声强化效果在较低温度下比在较高温度下更为明显。通过经典的收缩核模型对有和没有超声的钾长石浸出动力学进行了成功建模，其中产物层扩散是控制步骤。发现超声作用下，温度范围在 60 至 90°C 之间的表观活化能分别为 55.67kJmol 和 72.33kJmol。由于表观活化能降低，超声作用下的速率常数大大增加，导致钾的溶解分数提高。
