The leaching kinetics and mechanism of potassium from phosphorus-potassium associated ore in hydrochloric acid at low temperature

The leaching kinetics and mechanism of potassium from phosphorus-potassium associated ore in hydrochloric acid at low temperature
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磷钾伴生矿低温盐酸浸出动力学及机理

DOI:
10.1080/01496395.2016.1250776
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发表时间:
2017-01
影响因子:
2.8
通讯作者:
Cunwen Wang
Cunwen Wang
中科院分区:
工程技术4区
文献类型:
--
作者:
Renliang Lv;Weiguo Wang;Yuanhang Qin;Cunwen Wang

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研究了盐酸/萤石(CaF 2)体系中磷钾共生矿中钾的浸出动力学。HCl浓度、液固比、CaF 2用量和温度是影响反应的主要因素。在最佳操作条件下,钾的浸出率可达92%以上。以混合化学扩散为控制步骤的经典收缩核模型成功地模拟了钾的浸出动力学,其活化能为30.7 kJ·mol−1。根据实验结果,对钾的浸出机理进行了初步的探讨。
ABSTRACT The leaching kinetics of potassium from phosphorus-potassium associated ore in hydrochloric acid/fluorite (CaF2) system was studied. HCl concentration, liquor/solid ratio, CaF2 dosage, and temperature were found to be the main factors. The leaching rate of potassium can be reached more than 92% under the optimum operation conditions. A classic shrinking core model with the mixed chemically diffusion as the rate-controlling step was successfully modeled the leaching kinetics of potassium, and the activation energy was found to be 30.7 kJ·mol−1. The leaching mechanism of potassium was also elucidated based on the experimental results.
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