云南煤系铀资源潜力分析与典型矿床铀赋存状态研究

Potential Analysis of Uranium Resources in Coal Measures and Study on Uranium Occurrences of Typical Ore Deposits in Yunnan Province

为查明云南省煤系铀资源区域分布规律和富集特征,探讨协同开采工艺。开展了196份煤田勘查资料中1663口钻孔的自然伽马测井曲线异常筛查和506矿床的铀矿赋存状态研究工作,筛查出的267口异常钻孔数据统计表明:云南省煤系铀资源呈现富集于滇东上三叠统煤田和滇西新近系煤田的特征。以铀元素含量40μg/g为考察标准,进一步针对云南省同时具备工业价值和煤层含铀性富集趋势的煤田进行潜力评估认为:属于云南省新近系地层褐煤资源开发区的临沧盆地群大寨煤区、潞西盆地等㽘煤区、龙川江盆地团田煤区、弥勒盆地群跨竹煤区具备较大的煤铀协同开发的潜力,值得重点关注;并结合文献提出褐煤脱水处理前增加碱溶酸析工艺和褐煤燃烧时候加入CaCl_(2)等碱性固定剂等煤系铀提取建议。最后针对龙川江盆地团田煤区506铀矿床的分析结果进一步确定:沥青铀矿与稀土磷钙铀矿等铀矿物的产出与地层中有机质、煤质的关系十分密切。

In this paper,the natural gamma screening was carried out on 1663 boreholes in Yunnan Province,and combined with the occurrence characteristics of coal and uranium in the borehole,the analysis was obtained,Uranium resources of coal measures in Yunnan Province are enriched in the Upper Triassic and Neogene coalfields of eastern Yunnan and western Yunnan.Taking uranium content of 40 ug/g as the inspection standard,the potential evaluation of coal fields in Yunnan Province was further carried out:Dazhai area of Lincang Basin,Denggang area of Luxi Basin,and the Kuazhu area of Mengzi Basin Group have great potential of coal and uranium cooperative development,which should be paid more attention.Suggestions on extraction of uranium from coal measures are put forward.Finally,according to the analysis results of 506 uranium deposit,it is further confirmed that the production of pitchblende and other uranium minerals is closely related to the organic matter and coal quality in the strata.