WANG M Z, XIE H, BAI Y,et al.Investigation of the relationship between organic matter content and P-U mineralization in the uranium-bearing phosphorite in Tongren，Guizhou[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(4):64-75.

doi:10.16186/j.cnki.1673-9787.2021080104

Received:2021/08/28

Revised:2022/02/14

Published:2023/07/25

Investigation of the relationship between organic matter content and P-U mineralization in the uranium-bearing phosphorite in Tongren，Guizhou

WANG Mengzhai1,2, XIE Hong1,2, BAI Yang1,2, LU Zhenghao1,2

1.College of Resources and Environmental Engineering，Guizhou University，Guiyang  550025，Guizhou，China；2.Key Laboratory of Karst Geological Resources and Environment of Ministry of Education，Guizhou University，Guiyang  550025，Guizhou，China

Abstract: The uranium-bearing phosphorite in Tongren,Guizhou is rich in organic matter. In order to explore the mineralization relationship between organic matter and P-U,microscopic characteristics of rock/ore and geochemical studies were carried out. The results showed that the organic matter was distributed in a leached form within the collophanite;The total organic matter content(TOC) in the ore was high,with an average value of 0. 84%. TOC exhibited a positive correlation with P₂O₅ and U contents. Moreover,low TOC/w(N) and high w(Cr)/w(Zr) ratios indicated that the organic matter in the ore and P-U were both of endogenous origin and high w(U)/w(Th) ratios implied that P-U might have enriched in hot waters,while low w(Th)/w(U) ratios,high δU values,and high w(V)/w(V+Ni) ratios indicated that the uranium-bearing phosphorite might have been formed in a strong reduction environment. During P-U mineralization,organic matter actively participated in the migration and activation of mineralized material mainly by adsorption,life metabolism,and generation of uranyl complexes. These processes changed the P-U mineralized environment by releasing reductive gas,forming humic acid and acidic uranyl complexes,which in turn contributed to P-U enrichment and mineralization.

Key words:organic matter;mineralization relationship;uranium-bearing phosphorite;Guizhou Tongren

贵州铜仁磷块岩型铀矿中有机质与P-U成矿关系探讨_王孟斋.pdf