新疆某砂岩铀矿地球化学特征及其地浸意义

以新疆某砂岩铀矿为研究对象，分析了其地球化学特征（主量、微量元素及铀赋存形态）及其对地浸采铀的影响。样品中铀赋存形态表现出活性铀占主体地位、惰性铀所占比例小的特征。SiO2、Na2O含量及烧失量均对浸出液铀浓度具有较大的影响，微量元素分布特征对铀浸出的影响很小。铀赋存形态是影响铀浸出率的决定性因素，即活性铀含量越高，铀浸出率一般越高，反之亦然。从主量元素分布特征及铀赋存形态角度考虑，本砂岩铀矿是适合采用酸法地浸技术开采的。

Geochemical Characteristics of a Sandstone Uranium Deposit from Xinjiang and Their Effects to In-situ Leaching of Uranium

Geochemical characteristics (including major elements，minor elements and chemical speciation of uranium) of a sandstone uranium deposit from Xinjiang and their effects to in-situ leaching of uranium have been analyzed.The active uranium in the chemical speciation of uranium is principal，with low proportion of the inert uranium.Effects of contents of SiO2 and Na2O and LOI (loss on ignition) on uranium concentration of leaching solution are relatively large，but that of the distribution of minor elements are light.Chemical speciation of uranium is a decisive influencing factor for leaching rate of uranium.The higher content of active uranium is，the higher leaching rate of uranium will be in general，and vice versa.Hence，the sandstone uranium deposit can be exploited suitably by using the technique of in-situ leaching with dilute sulfuric acid after integrated considering the distribution characteristics of major elements and the chemical speciation of uranium.