锂辉石
氢氧化钾
浸出(土壤学)
氢氧化锂
化学
钾
锂(药物)
萃取(化学)
活化能
动力学
湿法冶金
材料科学
无机化学
溶解
色谱法
物理化学
离子
离子交换
有机化学
医学
陶瓷
物理
环境科学
量子力学
土壤科学
土壤水分
内分泌学
作者
Shengbo Qiu,Yue Zhu,Youfa Jiang,Cheng-Lin Liu,Jianguo Yu
标识
DOI:10.1021/acs.iecr.2c02019
摘要
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.
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