文献类型：期刊文献

中文题名：KOH亚熔盐与锂辉石精矿反应过程研究

英文题名：Study on reaction process of KOH sub?molten salt with spodumene concentrate

作者：彭睿敏[1];刘程琳[1,2];于建国[1,2]

机构：[1]华东理工大学国家盐湖资源综合利用工程技术研究中心,上海200237;[2]华东理工大学钾锂战略资源国际联合实验室,上海200237

年份：2026

卷号：58

期号：5

起止页码：43

中文期刊名：无机盐工业

外文期刊名：Inorganic Chemicals Industry

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划项目(2023YFB4103502);江西省重点研发计划项目(20223BBG74008)。

语种：中文

中文关键词：锂辉石;KOH亚熔盐;浸出提锂;动力学

外文关键词：spodumene;KOH sub?molten salt;leaching of lithium;kinetics

摘要：近年来,随着“双碳”政策的大力推动,新能源产业得到快速发展。锂作为高能量密度电池的核心材料,在推动实现“双碳”目标的过程中发挥着重要作用。锂辉石氧化锂品位高,是矿石提锂的主要原料。为解决传统提锂工艺存在的高能耗及设备腐蚀问题,采用澳大利亚锂辉石精矿,以KOH亚熔盐为介质直接浸取提锂,考察搅拌速率、KOH质量分数、碱矿比、浸出温度、浸出时间等因素对锂辉石中锂元素提取率的影响。结果表明,当锂辉石粒度小于250μm、KOH质量分数为50%、搅拌速率为500 r/min、浸出温度为523.15 K、碱矿比为2、浸出时间为24.0 h时,锂的总提取率可达到89.9%,其中固相中占84.1%,液相中占5.8%。动力学研究表明,α-锂辉石在KOH亚熔盐介质中的浸出过程受界面化学反应控制,表观活化能为96.36 kJ/mol。采用KOH亚熔盐直接浸取α-锂辉石可实现锂的高效提取,并消除传统工艺的高能耗等弊端,为矿石提锂绿色新工艺的开发提供理论与技术支持。
With the strong promotion of“dual carbon”policy in recent years,the new energy industry has experienced sig?nificant growth.As a core material for high?energy?density batteries,lithium has become one of the key factors to achieve the carbon peaking and carbon neutrality goals.Spodumene is the main source of lithium extraction from ore due to its high grade of lithium oxide.To address the issues of high energy consumption and equipment corrosion in the traditional lithium extraction process,spodumene concentrate from Australia was selected,and the direct leaching process of spodumene using KOH sub?molten salt as the medium was studied.The effects of factors such as stirring speed,mass fraction of KOH,alkaline?ore ratio,leaching temperature,and leaching time on the extraction rate of lithium from spodumene were investigated.The experimental results showed that under the conditions of spodumene particle size less than 250μm,the KOH mass fraction of 50%,the rotational speed of the reactor of 500 r/min,the leaching temperature of 523.15 K,the alkaline?mineral ratio of 2,and the leaching time of 24.0 h,the total lithium extraction efficiency reached 89.9%,which accounted for 84.1%in the solid phase and 5.8%in the liquid phase.The kinetic study showed that the leaching process ofα-spodumene in KOH sub?molten salt was belonged to the chemical reaction control process,with an apparent activation energy of 96.36 kJ/mol.In summary,the direct leaching ofα-spodumene in KOH sub?molten salt enabled highly efficient lithium extraction,and eliminated drawbacks of traditional processes such as high energy consumption,thereby providing theoretical and technical support for the development of green innovative technologies in lithium extraction from ores.