岩矿测试2018，Vol.37Issue(3)：256-265,10.DOI:10.15898/j.cnki.11-2131/td.201710310172
贵州铜仁坝黄磷矿中铀赋存状态的逐级化学提取研究
Stepwise Extraction Study on the Occurrence of Uranium in Tongren Bahuang Phosphorite,Guizhou
摘要
Abstract
BACKGROUND:Previous studies have found that phosphorite deposits in Tongren Bahuang of Guizhou Province is rich in the radioactive element uranium. OBJECTIVES:To investigate the distribution regularity of phosphorite type uranium deposits,the metallogenic mechanism,and comprehensive development of uranium resources,by using the stepwise chemical extraction method to analyze the occurrence of uranium. METHODS:The modified Tessier process was used to extract seven different forms of uranium,including water-soluble,exchangeable ion,carbonate-bound,iron-manganese combined,organic-pyrite combined,strong acid and residual. RESULTS:The uranium in the phosphorite deposits occurs mainly in the form of independent uranium minerals and metamorphosed isomorphisms,accounting for 37.83% and 37.21%,respectively,and a small amount of uranium (24.96%)exists in the form of dispersed adsorption.The results show that the content of independent uranium minerals in the P-rich rocks,pyrite veins and specular surface is higher,which indicates that the hydrothermal activity is beneficial to the enrichment of uranium in the form of independent minerals.The isomorphism uranium is positively correlated with the content of phosphorus,and the uranium element may be deposited in the lattice defects of colloidal phosphate in the way of ion-substitution.The content of the adsorbed uranium is affected by the clay mineral content and pyrite vein in the rock.The organic matter pyrite state is the main state of the adsorbed uranium.A small amount of uranium adsorbed on the surface of clay minerals by diffusion. CONCLUSIONS:In addition to the fact that the isomorphous uranium is not easy to extract and utilize due to its existing form,independent uranium minerals and adsorbed uranium have practical significance for optimizing the resource allocation in the future.关键词
磷块岩型铀矿/逐级化学提取/赋存状态/独立铀矿物/类质同象Key words
phosphorite type uranium deposit/stepwise chemical extraction/occurrence state/independent uranium minerals/isomorphism分类
天文与地球科学引用本文复制引用
王志罡,谢宏,杨旭,周忠容..贵州铜仁坝黄磷矿中铀赋存状态的逐级化学提取研究[J].岩矿测试,2018,37(3):256-265,10.基金项目
国家自然科学基金资助项目(41662008) （41662008）
贵州大学引进人才科研项目(贵大人基合字[2015]37) （贵大人基合字[2015]37）
贵州省科技计划项目(黔科合平台人才[2017]5788) （黔科合平台人才[2017]5788）
