Effect of elemental composition and phase transformation on lithium leaching behavior of micas in calcination-acid leaching process

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL Applied Clay Science Pub Date : 2024-08-14 DOI:10.1016/j.clay.2024.107522

Kesheng Zuo, Xuanping Zhou, Hao Wang, Zhihang Li, Kun Xiong, Hongfei Cheng

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Abstract

Lithium (Li)-bearing clays have emerged as new types of Li resources. The structure and elemental composition of clay minerals play a crucial role in determining the Li leaching efficiency. The elemental composition and structural transformation of Li-bearing mica from Inner Mongolia (IMS) and Jiangxi (JS), China, were studied during the calcination-leaching process by using X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR) and electron microprobe analysis (EMPA). The findings indicate that Mica is the predominant Li-bearing mineral in both IMS and JS. Notably, the IMS mica contains a significantly higher concentration of fluorine compared to the JS mica. Fluorine exerts a minor inhibitory effect on Li leaching, whereas the hydroxyl group (OH) significantly inhibits the leaching of Li from mica. The removal of residual oxygen atoms post-dehydroxylation is crucial to extract Li from mica. Both defluorination and dehydroxylation reactions occur within the temperature range of 800 °C to 900 °C. When calcined at 900 °C, the IMS mica was transformed into sanidine, while the JS mica was transformed into microcline. The acid leaching of products calcined at this temperature represents a process that further disrupts the residual mica structure and facilitates a cation exchange reaction.

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元素组成和相变对煅烧-酸浸出过程中云母锂浸出行为的影响

含锂（Li）粘土已成为新型锂资源。粘土矿物的结构和元素组成对锂浸出效率起着至关重要的作用。利用 X 射线衍射 (XRD)、傅立叶变换红外光谱 (FTIR) 和电子微探针分析 (EMPA) 研究了中国内蒙古（IMS）和江西（JS）的含锂云母在煅烧-浸出过程中的元素组成和结构变化。研究结果表明，云母是 IMS 和 JS 中最主要的含锂矿物。值得注意的是，与 JS 云母相比，IMS 云母中的氟含量要高得多。氟对锂沥滤的抑制作用较小，而羟基（OH）对云母中锂的沥滤有明显的抑制作用。脱羟基后去除残余氧原子对从云母中提取锂至关重要。脱氟和脱羟基反应都发生在 800 °C 至 900 °C 的温度范围内。在 900 °C 煅烧时，IMS 云母转化为联苯胺，而 JS 云母则转化为微晶。在这一温度下煅烧的产品的酸浸出过程进一步破坏了残余云母结构，促进了阳离子交换反应。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...