title: The leaching kinetics of K-feldspar in sulfuric acid with the aid of ultrasound.
abstract: The leaching kinetics of K-feldspar in H2SO4-CaF2system with the assistant of ultrasound was investigated. The effects of various factors, such as sulfuric acid concentration, liquid-to-solid ratio, CaF2dosage 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-1and 72.33kJmol-1, 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.
authors.affiliation: Key Laboratory of Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, China.
authors.forename: Jiayu
authors.initials: J
authors.lastname: Ma
authors.affiliation: 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.
authors.forename: Yanfang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: 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.
authors.forename: Yuanhang
authors.initials: Y
authors.lastname: Qin
authors.affiliation: 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.
authors.forename: Zaikun
authors.initials: Z
authors.lastname: Wu
authors.affiliation: 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.
authors.forename: Tielin
authors.initials: T
authors.lastname: Wang
authors.affiliation: 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. Electronic address: wangcw0120@163.com.
authors.forename: Cunwen
authors.initials: C
authors.lastname: Wang
keywords: Cavitation effect; K-feldspar; Leaching kinetics; Potassium; Ultrasound