文献类型：期刊文献

英文题名：Kinetics and Mechanism of Lithium Extraction from α-Spodumene in Potassium Hydroxide Solution

作者：Qiu, Shengbo[1];Zhu, Yue[1];Jiang, Youfa[1];Liu, Chenglin[2];Yu, Jianguo[2]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Shanghai 200237, Peoples R China

年份：2022

卷号：61

期号：41

起止页码：15103

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20224212980205);WOS:【SCI-EXPANDED(收录号:WOS:000872958600001)】；

基金：? ACKNOWLEDGMENTS This work was sponsored by the National Key R&D Program of China (2021YFC2902603) and Shangha i Pujiang Program (2019PJD011) .

语种：英文

外文关键词：Activation energy - Extraction - Leaching - Lithium - Lithium compounds - Potassium hydroxide - Silicon

摘要：Lithium extraction from alpha-spodumene in a potassium hydroxide solution was proposed to provide a new green metal-lurgical process for spodumene concentrate. The structure of alpha- spodumene could be destroyed directly by a KOH solution, and new solid-phase products of Li2SiO3 and KAlSiO4 were generated simultaneously. The total lithium extraction efficiency could reach 89.9%, of which 84.1% was converted into Li2SiO3 and 5.8% converted into the liquid phase under optimal conditions: initial KOH concentration of 50 wt %, stirring speed of 500 rpm, mass ratio of KOH/ore of 2:1, leaching temperature of 523.15 K, and leaching time of 16 h. The experimental data fitted well with the Avrami- Erofeev equation model, -ln(1 - X) = (Kt)n. The apparent activation energy and Avrami index were calculated as 106.37 kJ center dot mol-1 and 0.80, respectively.