中国西南滇黔地区沉积包裹稀土元素成矿作用:矿物学和成矿模式

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-09-03 DOI:10.3390/min14090903
Bo Hui, Daxing Gong, Lu Xu, Yang Lai, Jianhua Qin, Ying Xu, Wei Yang, Haitao Lin
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引用次数: 0

摘要

中国西南滇黔桂地区宣威地层的粘土岩富含稀土元素(REEs),表明其具有作为中重稀土来源的潜力。然而,这些岩石中的稀土元素含量低于其他类型的稀土矿床,而且粘土矿物之间的相互关系错综复杂。没有直接证据表明稀土已经成矿,这限制了稀土的选矿和提取。本研究的目的是描述滇黔区的稀土分布特征。该区的沉积岩主要由高岭石、沸石、石英、金红石和黄铁矿组成。对富含 REE 的粘土岩进行连续化学萃取和透射电子显微镜(TEM)观察的结果证实,REE 以萤石岩的形式存在于岩石中,离子吸收态对 REE 含量的贡献微乎其微。萤石和高岭石之间的密切关系使得传统的矿物加工操作非常困难。结合高岭石的特性,焙烧酸浸出法是从宣威地层富稀土粘土岩中提取稀土资源的有效方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sediment-Hosted Rare-Earth Elements Mineralization from the Dian-Qian District, Southwest China: Mineralogy and Mode of Occurrence
The Xuanwei Formation’s claystones in the Dian-Qian District of Southwest China are rich in rare-earth elements (REEs), suggesting their potential as a source of medium and heavy rare earths. However, the REE content in these rocks is lower than other types of rare-earth deposits, and the interrelationship among clay minerals is intricate. There is no direct evidence indicating the mineralization of REEs, limiting their beneficiation and extraction. The objective of this study is the characterization of REE distribution in the Dian-Qian District. The sedimentary rocks in this district are mainly composed of kaolinite, boehmite, quartz, rutile, and pyrite. The results of continuous chemical extraction of REE-rich claystone and transmission electron microscope (TEM) observations have confirmed that REEs occurred as florencite in the rocks, and that the ion-absorption state makes only a negligible contribution to the REE content. A close relationship between florencite and kaolinite makes traditional mineral processing operations very difficult. Combined with the properties of kaolinite, roasting-acid leaching was the efficacious approach for rare-earth resources extracted from the rare earth-rich clay rocks of the Xuanwei Formation.
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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