钾长石超声波强化浸出动力学

Ultrasound-assisted leaching kinetics of potassium from potassium feldspar

在超声波体系下对钾长石进行了硫酸酸浸动力学研究,实验结果表明,由于超声空化作用,以硫酸作为浸出剂超声波能强化钾长石的酸浸过程,钾浸出率可以提高3%-8%。适宜的浸出工艺条件为：超声功率100 W,反应温度90℃,液固比4∶1,原料比（CaF2质量/钾长石质量）0.1,硫酸质量分数40%,反应时间7h,此时钾的浸出率可达83.23%。钾长石超声波强化浸出过程可利用粒度不变的缩核模型来描述,活化能为45.69kJ/mol,属于化学反应控制过程。

The leaching kinetics of potassium from potassium feldspar was studied in sulfuric acid solution with the assistance of ultrasound. Experimental results show that the leaching rate of potassium can increase by 3%-8% in the presence of ultrasound in sulfuric acid solution because of the ultrasonic cavitation. Un- der appropriate conditions of reaction temperature of 90 ℃, liquid solid ratio of 4, materials ratio of 0.1, the sulfuric acid concen- tration of 40%, and reaction time of 7 h, the leaching rate of potassium can reach 83.23%. The kinetics analysis shows that the leaching reaction follows the classical unreacted core-shrinking model with the chemical reaction as the rate-controlling step and the activation energy is found to be 45.69 kJ / mol.