低品位锂云母焦硫酸钾焙烧改性提锂工艺及机制研究  

Research on Process and Mechanism of Lithium Extraction from Low Grade Lithium Lepidolite by Roasting with Potassium Pyrosulfate

作　　者：周朝锋 周林 朱军强 章峰峰 孙毓 王忠兵 陈浩 胡文静 玉增蒙 王惠倩 ZHOU Chaofeng;ZHOU Lin;ZHU Junqiang;ZHANG Fengfeng;SUN Yu;WANG Zhongbing;CHEN Hao;HU Wenjing;YU Zengmeng;WANG Huiqian(Dongjiang Environmental Co.,Ltd.,Shenzhen 518057,Guangdong,China;Jiangxi Dongjiang Environmental Protection Technology Co.,Ltd.,Fengcheng 331100,Jiangxi,China;Guangdong P rovincial Key Laboratory of Hazardous Li quid Waste Reclamati on and Advanced Treatment Technology Research and Development Enterpri se,Shenzhen 518057,Guangdong,China;School of Envi ronment&Chemi cal Engineering,Nanchang Hangkong Uni versity,Nanchang 330063,China)

机构地区：[1]东江环保股份有限公司,广东深圳518057 [2]江西东江环保技术有限公司,江西丰城331100 [3]广东省危险废液资源化与深度处理技术研发企业重点实验室,广东深圳518057 [4]南昌航空大学环境与化学工程学院,南昌330063

出　　处：《有色金属(冶炼部分)》2025年第4期143-150,共8页Nonferrous Metals(Extractive Metallurgy)

基　　金：江西省自然科学基金资助项目(20232BCJ22049,20243BCE51042)。

摘　　要：以锂云母为原料,焦硫酸钾为改性剂,研究了各因素对锂云母改性效果的影响。结果表明:控制焦硫酸钾与锂云母的质量比为1∶1、焙烧温度900℃、保温90 min,可将锂云母矿中稳定态锂转化为可浸出态硫酸锂,锂提取率可达到95.57%以上。同时,推测出锂焙烧改性机制过程为:随着温度升高,K2S2O7首先发生脱水反应,随后发生分解反应,释放出吸附态SO2、SO3等活性气体微颗粒,这些活性气体微颗粒首先吸附在锂云母颗粒表面,在晶体结构中锂离子异性电子云牵引下,形成S—Li—O化学键,并晶型化形成硫酸盐结构。Taking lepidolite as raw material and potassium pyrosulfate as modifier,the influences of various factors on the modification effect of lepidolite and its modification mechanism were studied.The results show that when the mass ratio of potassium pyrosulfate to leucite is 1∶1,the calcination temperature is 900℃ and the holding time is 90 min,the stable lithium in lepidolite ore can be converted to leachable lithium sulfate,and the extraction rate of lithium can reach more than 95.57%.At the same time,the process of lithium roasting modification mechanism is inferred as follows:With the increase of temperature,K2S2O7 first undergoes dehydration reaction,followed by decomposition reaction,releasing adsorbed active gas microparticles such as SO2 and SO3.These active gas microparticles are first adsorbed on the surface of lepidolite particles,and under the traction of opposite electron clouds lithium ion in the crystal structure,S-Li-O chemical bonds are formed and crystallize into sulfate structure.

关 键 词：低品位锂云母 焦硫酸钾 焙烧改性 硫酸锂 

分 类 号：TF826.3[冶金工程—有色金属冶金] TF803.11