吐哈盆地十红滩铀矿床北矿带铀的赋存状态研究及对地浸开采影响分析

Study on the Occurrence State of Uranium in the Northern Ore Belt of the Shihongtan Uranium Deposit in the Tuha Basin,And its Impact on the In-Situ Mining

通过铀在含矿目的层西山窑组碎屑岩中各粒级的配分比例、α径迹蚀刻、电子探针,铀的价态和含氧系数等多种测试方法,对十红滩铀矿床北矿带铀的赋存状态进行了系统研究。发现北矿带矿石中60.93%~87.45%的铀赋存在粒径小于0.05 mm的填隙物中,α径迹蚀刻显示主要呈团块状、(弱)聚集状及星点状分布,铀的赋存状态主要为沥青铀矿、铀石和铀钛氧化物(含铀钛氧化物),矿石的U^6+/U^4+平均2.15,含氧系数平均2.58。通过本次对吐哈盆地十红滩铀矿床北矿带铀的赋存状态研究,认为对北矿带开展地浸选冶工艺具有借鉴意义。

In this paper,the occurrence of uranium in the northern ore belt of the Shihongtan uranium deposit and its uranium valence state were studied by means of uranium partitioning,α-track etching,electron probe and chemical analysis.It is found that 60.93%~87.45%of the uranium in the ore belt is found in the interstitial with a particle size of less than 0.05 mm.The uranium is mainly composed of asphalt uranium,uranium and uranium titanium oxide(including uranium titanium oxide),αtrack etching shows that the star-point dispersion is scattered and weakly aggregated.The average of U^6+/U^4+ is 2.15,and the oxygen coefficient,with an average of 2.58,which is beneficial to in--situ mining.This study has reference significance for the study of uranium ore-forming mechanism in the northern ore belt of the Shihongtan uranium deposit in the Tuha Basin and the experimental technology of the leaching mining.