某低品位黏土型锂矿石的焙烧—无酸浸出试验研究
Study on Roasting and Non-acid Leaching Test of a Low Grade Clay Type Lithium Ores
刘洋 1童雄 2谢瑞琦 2谢贤 2宋强 1范培强1
作者信息
- 1. 昆明理工大学国土资源工程学院,云南 昆明 650093
- 2. 昆明理工大学国土资源工程学院,云南 昆明 650093;金属矿尾矿资源绿色综合利用国家地方联合工程研究中心,云南 昆明 650093;省部共建复杂有色金属资源清洁利用国家重点实验室,云南 昆明 650093
- 折叠
摘要
云南某低品位黏土型锂矿石含锂 0.147%,为探究低能耗、环保的开发利用工艺,采用新型焙烧助剂ASH开展了低温焙烧—无酸浸出的提锂工艺研究,并结合XRD、SEM-EDS等分析手段阐述了反应机理.试验结果表明,在试样与ASH质量比为 1∶0.3、焙烧温度为 400℃、焙烧时间为 1.0 h,去离子水浸出时间为 2 h、浸出温度为 70℃、液固比为 5 mL/g条件下,锂浸出率为 83.81%.机理分析显示,焙烧—浸出前后,样品中主要矿物相未发生变化,但衍射峰强度降低;经焙烧—浸出后,浸渣表面均匀分布着裂纹和空隙,Al、Si、Fe、Ti含量均有所降低.说明ASH与矿物发生反应,破坏了矿物的表面结构,生成了可溶性盐Li-ASH.与传统焙烧—浸出工艺相比,本研究所采用的提锂工艺焙烧温度低、浸出时无酸,降低了生产能耗、简化了工艺流程,对同类型低品位黏土型锂矿的绿色高效开发利用具有重要借鉴意义.
Abstract
This study investigates a novel low-temperature roasting and non-acid leaching lithium extraction process using a new roasting aid,ASH,for an extremely low-grade clay lithium ore in Yunnan,China,with a lithium content of 0.147%.The reaction mechanism was elucidated through X-ray Diffraction(XRD),Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy(SEM-EDS),and other analysis methods.Experimental results demonstrated that under the conditions of a sample to ASH mass ratio of 1∶0.3,roasting temperature at 400℃,roasting time of 1.0 hour,deionized water as the leaching agent,leaching time of 2 hours,leaching temperature of 70℃,and liquid-solid ratio of 5 mL/g,the lithium leaching rate reached 83.81%.Mechanism analysis indicated that while the main mineral phases in the sample remained unchanged before and after roasting-leaching,the intensity of diffraction peaks decreased.Post roasting-leaching,the sample surface exhibited u-niform distribution of cracks and voids,along with decreased contents of Al,Si,Fe and Ti.This suggests a reaction between ASH and minerals,disrupting the mineral surface structure and generating soluble Li-ASH leachate.Compared to traditional roasting-leaching processes,this study's lithium extraction process features lower roasting temperatures and acid-free leaching,reducing production energy consumption,simplifying the process flow,and offering significant insights for the green and effi-cient development and utilization of similar low-grade clay lithium ores.
关键词
黏土型锂矿/焙烧助剂ASH/低温焙烧/无酸浸出Key words
clay type lithium ore/roasting agent ASH/low temperature roasting/non-acid leaching引用本文复制引用
基金项目
国家自然科学基金(52174252)
云南省基础研究计划(202201BE070001-016)
昆明理工大学"双一流"科技专项(202202AG050010)
出版年
2024
NETL
NSTL
万方数据