低煤级煤与UO_2^(2+)的吸附络合及亲煤型铀矿成矿过程  

Mechanism of uranyl ion adsorbing and complexing onto low-rank coal and ore-forming process of uranium associated coal measures

作　　者：杨志远[1,2] 张泓[1] 张群[1] 李恒堂[1] 李建武[1] 

机构地区：[1]煤炭科学研究总院西安研究院,陕西西安710054 [2]西安科技大学,陕西西安710054

出　　处：《煤田地质与勘探》2009年第5期1-5,10,共6页Coal Geology & Exploration

基　　金：国家重点基础研究发展计划(973计划)项目(2003CB214602;2006CB202202);中国博士后科学基金项目(20070421103)

摘　　要：针对中国亲煤(煤系)砂岩型铀矿床成矿过程,以不同氧化程度的低煤级煤为研究对象,采用分光光度法研究煤对铀酰离子的吸附络合作用。结果表明,煤对铀酰离子(UO22+)的吸附作用受煤氧化程度、煤种、溶液pH值、环境温度和铀溶液初始浓度等因素影响。脱附实验和红外光谱分析进一步证明,煤中活性官能团与铀酰离子发生了明显的化学吸附/络合作用。基于上述结果,提出了亲煤型砂岩铀矿的成矿过程,为揭示煤与铀矿共伴生关系提供了基础数据。According to the ore-forming process of sand-type uranium ore associated coal measures, the adsorbing and complexing effects between low-rank coal of different oxidation degree and uranyl ion were studied by spec- trophotometry in this paper. The results showed that the adsorbing effects were affected by many factors, such as coal oxidation degree, coal type, pH value of solution, environmental temperature and initial concentration of uranyl ion. The desorption experiment and FTIR analysis further demonstrated that the active functional groups in coal reacted with uranyl ions, and formed complexing and chemistry adsorption. Based on the above results, a new ore-forming process of sand-type uranium ore associated coal measures was proposed.

关 键 词：低煤级煤 吸附络合 铀酰离子 亲煤型砂岩铀矿 成矿过程 

分 类 号：P618.11[天文地球—矿床学] P619.14[天文地球—地质学]