江西相山矿田鹏姑山地区铀成矿条件及资源潜力分析

鹏姑山地区位于相山矿田西部的居隆庵菱形断块与芙竹坪菱形断块所夹持的"锐角"部位,东邻邹家山、船坑及平顶山矿床,西靠书塘、李家岭及居隆庵矿床,是书塘的北东段与邹家山4号带西南延伸段。区内断裂构造发育,主要有贯穿整个鹏姑山地区的北东向邹家山-石洞和北西向济河口两个主断裂,其次是主断裂派生的近南北向断裂,以及包含火山塌陷构造。通过近几年的勘查工作,在区内西端初步发现一条受近南北向济河口断裂控制的铀成矿带。矿体受构造、岩性组间界面以及蚀变复合控制。现有的资料显示,该区铀成矿地质条件优越,铀资源潜力大。     

阳离子交换法浓缩铀同位素的络合剂选择理论——Ⅱ.UO_2~(2+)被加速传质研究

本文用大孔磺酸型阳离子交换树脂研究并确认了树脂相U(Ⅳ)、Ti(Ⅳ)、Fe(Ⅱ)以及液相中H_2SO_4、HCl、六种羧酸对UO_2~(2+)-H~+交换过程的加速作用。肯定了内扩散系数和滞留时间对应规律的普遍性;明确了阴离子的加速效应次序;用吸附双电层理论解释了阴离子加速传质效应的起因,并对UO_2~(2+)-H~+交换的起始阶段作了理论分析。     

毫微克级铀的溶出伏安法测定——天然水中微量铀的直接测定

本文介绍毫微克级铀的微分脉冲溶出定量测定法。在pH～4的HAc-NaAc介质中,当铜铁试剂浓度为(3×10~(-3)-1×10~(-2))‰时,有一个清晰且有富集效果的铀峰,峰电位～-1.1V(相对于Ag/AgCl电极)。峰电流与铀浓度在0.05-6.6ng/ml之间有线性关系。测定下限为0.05ng/ml,方法的相对标准偏差为4％。此法可用于直接测定天然水中微量铀。     

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铀是一种强放射性元素，同时又是一种地球化学性质非常活泼的元素，具有高度的成岩敏感性。由于变价的特点，铀对成岩过程中环境的氧化还原电位、温度、压力、还原作用、吸附作用、酸碱度等变化反应灵敏，极易发生迁移和沉淀，导致铀的局部富集和贫化。铀的地球化学行为决定了它在地层中有良好的可动性，因而是一种有用的示踪元素，可以用来追索沉积体系演化过程中发生的许多重要地质事件。文章概述了铀在表生作用带的地球化学行为、分布状况和迁移富集规律，指出在沉积阶段沉积物中吸附的铀量很少，成岩作用才是使铀富集的根本原因；并以铀测井资料在四川盆地的应用为主，简述了在油气勘探开发中铀在识别岩性和研究生油层、储集层、构造断裂、沉积环境、成岩环境、地下水、古气候等方面的应用。     

Studies on the extraction of uranium (VI) by bis (hexylsulfinyl) ethane

The extraction of uranium (VI) by bis(hexylsulfinyl)ethane(BHxSE) in nitric acid aqueous solution has been investigated. The extracted species appeared to be UO2(NO3)2-2BHxSE. Influences of nitric acid concentration, NaNO3 concentration, Na2C2O4 concentration and temperature on the extraction equilibrium were investigated and the thermodynamic functions of the extraction reaction were obtained.     

U(Ⅵ)的三元协萃 Ⅰ.U(Ⅵ)协萃体系分类、原理

对U(Ⅵ)不同类型的二元、三元协萃体系进行细致的分类研究和总结,讨论了U(Ⅵ)三元协萃络合物形成的原理,对U(Ⅵ)三元协萃体系进行剖析,并介绍了铀协萃物结构的空间堆积模型理论计算。     

同位素稀释质谱法测定高放废液中的铀

用双同位素稀释质谱法测定高放废液中的微量铀,采用TBP/Kel-F粉反相分配色层法分离铀,双稀释剂分别为浓缩~(235)U及~(238)U,铀同位素丰度比的质谱测定相对标准误差优于0.1%,化学处理及质谱测定全流程铀的空白值为3×10~(-9)g,方法检测限对于铀为1×10~(-9)g,高放废液中微量铀测定结果不确定度为±2%。     

铀及铀合金的防腐蚀电镀层研究进展

综述了铀及铀合金的蚀刻；总结了铀及铀合金的防腐蚀电镀层，包括Ni镀层、Ni Zn双重镀层、Zn-Ni合金镀层；介绍这些镀层的制备工艺；评述了这些电镀层对铀及铀合金的防腐蚀性能及保护机理。     

Electrical transport in UNi0.5Sb2 single crystals

Single crystals of UNi₀.₅Sb₂ were investigated by means of Seebeck coefficient and Hall effect measurements in the temperature range 5–300 K. The results corroborated the occurrence of two magnetic phase transitions: from para- to antiferromagnetic state at T_N = 161.5 K and a spin-reorientation near T_t = 64 K. The first-order character of the latter feature was proved by studying in detail the electrical resistivity and the magnetic susceptibility of single-crystalline UNi₀.₅Sb₂ in the vicinity of T_t.     

Role of diluents in uranium transport across a supported liquid membrane using di(2-ethylhexyl)isobutyramide as the carrier

The extraction and transport behaviour of uranium from nitric acid medium across a supported liquid membrane has been studied using di(2-ethylhexyl)isobutyramide as the carrier. The effects of experimental parameters such as nature of diluents, e.g., n-dodecane, benzene, chloroform, tert-butyl benzene, diethyl benzene, n-octanol, 1,2-dichlorbenzene, and 2-nitrophenyl octyl ether, the membrane thickness, and the nitrate ion concentration, on the extraction/transport behaviour of uranium are reported. The experimentally obtained and the theoretically calculated values of permeability coefficients for uranium transport have been compared for different diluents.