岩矿测试2012，Vol.31Issue(3)：501-506,6.
新疆某地浸砂岩型铀矿中铀赋存形态的研究
Study on Chemical Speciation of Uranium in Samples from in-situ Leaching Sandstone-type Uranium Deposit in Xinjiang
摘要
Abstract
This paper presents a method of studying uranium speciation from in-situ leaching sandstone-type uranium deposits by a sequential extraction procedure and demonstrates its application to sandstone uranium exploration. The chemical extraction procedure was modified from Tessier. Uranium in samples was classified into five speciations: exchangeable ions, bound to carbonates, bound to Fe-Mn oxides, bound to sulfide-organic matter and residual speciation. The first four phases consisted of active uranium with the residual uranium being stable uranium. The results show that the uranium distribution characteristics were significantly different whether they were in different samples or in the same sample. The average amounts of residual speciation, carbonates speciation, exchangeable speciation, sulfide-organic matter speciation and Fe-Mn speciation decreased in order as 37. 75% (RSD = 1. 80% ), 20. 56% (RSD = 2. 72%), 15. 51% ( RSD = 1. 85% ), 14. 26% ( RSD = 2. 08% ) and 11.91% ( RSD = 1.75% ) , respectively. According to the present technology of acid dipped processing, the active uranium was teachable and the inert uranium was unleachable. This study indicates that residual speciation is the primary component. The uranium extraction rate for uranium ore with a high proportion of residual uranium ( such as the No.4 sample with 57.17% residual uranium in this paper) is lower and the extraction rale does not increase significantly by improving the dissolve acidity and oxidants.关键词
砂岩型铀矿/铀赋存形态/逐级化学提取/活性铀Key words
sandstone type uranium deposit/ chemical speciation of uranium/ sequential chemical extraction/ active uranium分类
天文与地球科学引用本文复制引用
马强,冯志刚,孙静,谢二举,李小军..新疆某地浸砂岩型铀矿中铀赋存形态的研究[J].岩矿测试,2012,31(3):501-506,6.基金项目
国家自然科学基金项目(40973070) （40973070）
