Kinetics and Mechanism of Lithium Extraction from α-Spodumene in Potassium Hydroxide Solution,Industrial & Engineering Chemistry Research

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Kinetics and Mechanism of Lithium Extraction from α-Spodumene in Potassium Hydroxide Solution
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-10-06 , DOI: 10.1021/acs.iecr.2c02019
Shengbo Qiu ₁ , Yue Zhu ₁ , Youfa Jiang ₁ , Chenglin Liu _{1,

2} , Jianguo Yu _{1,

2}

Affiliation

Lithium extraction from α-spodumene in a potassium hydroxide solution was proposed to provide a new green metallurgical process for spodumene concentrate. The structure of α-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·mol^–1 and 0.80, respectively.

中文翻译：

氢氧化钾溶液中α-锂辉石提锂的动力学和机理

提出了在氢氧化钾溶液中从α-锂辉石中提取锂，为锂辉石精矿提供了一种新的绿色冶金工艺。KOH溶液可以直接破坏α-锂辉石的结构，同时生成新的固相产物Li ₂ SiO ₃和KAlSiO ₄。总提锂效率可达89.9%，其中84.1%转化为Li ₂ SiO ₃，5.8%转化为液相最佳条件：初始KOH浓度为50 wt %，搅拌速度为500 rpm，质量比为KOH/矿石2:1，浸出温度523.15 K，浸出时间16 h。实验数据与 Avrami-Erofeev 方程模型拟合良好，– ln(1 – X ) = ( Kt ) ⁿ。表观活化能和 Avrami 指数分别计算为 106.37 kJ·mol ^–1和 0.80。

更新日期：2022-10-06

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