中文摘要：

以伊犁盆地某砂岩铀矿为研究对象，采用逐级化学提取技术定量分析了其铀的赋存形态，各赋存形态铀含量由高到低依次为：碳酸盐结合态（均值44．58％）、铁锰氧化物结合态（均值28．46％）、可交换离子态（均值12．51％）、残渣态（均值7．90％）及硫化物及有机物结合态（均值6．52％）；分析证实，该铀形态分布特征有利于减少地浸成本与环境保护，活性铀（可浸出的铀形态）包括除残渣态外的其余4种铀形态，占绝对主体地位（均值92．08％），表明该砂岩铀矿可浸性良好，铀浸出率高。活性铀高的样品，其品位也高，活性铀相对较低的样品，其品位相应偏低，说明可被浸出的铀金属总量与该砂岩铀矿储量的比值应较高。因而，基于铀赋存形态分析，认为该砂岩铀矿适合采用地浸技术开采。

英文摘要：

The occurrence speciation of uranium of a sand stone uranium deposit in the Yili Basin was quantitatively an alyzed by using the method of sequential chemical extrac tion. The proportion of uranium chemical speciation was divided into carbonates （mean of 44.58%）, the Fe Mn oxides （mean of 28.46%）, the exchangeable （mean of 12.51%）, the residual （mean of 7.90,9%）, and the sulfide-organic matter speciation （mean of 6.52G）. The analysis verified that the characteristics of uranium speciation distribution is bene-ficial to cost reduction on in situ leaching of uranium and en- vironmental protection. The active uranium （which can be extracted using the technique of in-situ leaching） includes 4 chemical speciations except for the residual speciation was principal （mean of 92. 080/00）, which suggests that the uranium leaching rate of the sandstone uranium deposit is high. The sample with high proportion of active uranium is of high grade, and vice versa, which indicates that the ratio of total uranium extracted/reserves should be relatively high. Hence, the sandstone uranium deposit could be exploited suitably using the in-situ leaching technique based on analysis of uranium chemical speciations.