成果归属作者：

黄文辉

成果归属机构：

能源学院

作者：

Hao, Huidi ; Jiu, Bo ; Huang, Wenhui ; Sun, Mingzhe

单位：

Key Lab Marine Reservoir Evolut & Hydrocarbon Abun, Beijing 100083, Peoples R China;China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China;Peking Univ, Ordos Res Inst Energy, Ordos 017010, Peoples R China

关键词：

LATE PERMIAN COALS; SEDIMENTARY KAOLIN DEPOSITS; INNER-MONGOLIA; GEOCHEMICAL COMPOSITIONS; TRACE-ELEMENTS; EASTERN YUNNAN; ORE-DEPOSIT; HOST ROCKS; MINE; GA

摘要：

Niobium has been considered to be enriched in high-Al-Ga in north China coal and coal-hosted Nb(Ta)-Zr(Hf)REY-Ga polymetallic deposits in the southwestern region of China. However, modes of occurrence and influencing factors of Nb in Al-Ga-rich coal in North China are rarely reported. This study investigated the distribution characteristics of Nb in the No.6 high-Al-Ga coal of the Jungar Coalfield in North China. The in-situ Nb concentration of selected minerals, including kaolinite, Ti-oxides, boehmite, and zircon, is further quantitatively characterized based on multiscale in-situ elemental analyses, including SEM-EDS and LA-ICP-MS spot and mapping analyses. The results showed that Nb is rich in the tonstein and mudstone partings among bulk samples and is highly concentrated in Ti-oxides, followed by zircon among the minerals. A certain amount of Nb is associated with kaolinite and boehmite with different modes of occurrence: vermicular kaolinite (65.94 ppm) > clastic kaolinite (25.43 ppm) > altered K-bearing kaolinite (18.11 ppm) > cryptocrystalline kaolinite (17.03 ppm) > clastic boehmite (9.08 ppm) > cryptocrystalline boehmite (7.97 ppm). The Nb-Nb/Ta and Zr/Hf-Nb/Ta ratios suggest that the primary source of Nb in the No.6 coal is the altered felsic volcanic ash and bauxite deposit. The high-Fe concentration in Ti-bearing minerals indicates that anatase may originate from the alteration of ilmenite with a process of Fe depletion and Nb enrichment. The enrichment of Nb in coal is attributed to the substitution of Nb for Ti in isomorphism in all Ti-oxides, high-Ti, and Ti-bearing minerals.

基金：

National Key Research and Development Program of China [2021YFC2902003]; Na- tional Natural Science Foundation of China [42272201, 42302193]

语种：

英文

DOI：

10.1016/j.scitotenv.2024.174362

来源：

SCIENCE OF THE TOTAL ENVIRONMENT,2024():.

出版日期：

2024-10-10

提交日期：

2024-08-09

引用参考：

Hao, Huidi; Jiu, Bo; Huang, Wenhui; Sun, Mingzhe. Distribution and modes of occurrence of Nb in subbituminous coal: A case study from the Jungar Coalfield, Ordos Basin, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024():.