期刊论文

Tan, Kai-Xuan(nhtkx@126.com)

中文

原子能科学技术

1000-6931

2017

51

8

1358-1363

10.7538/yzk.2017.51.08.1358

91026015:国家自然科学基金 13C799:湖南省教育厅项目 2013KS28:衡阳市科技局项目

本校为第一且通讯机构

为研究铀同位素~(234)U/~(238)U活度比(ARS)对地浸采铀过程的指示作用,采用逐级提取方法分离新疆某砂岩铀矿的铀化学组分,通过柱浸实验获取浸出液,用ICP-MS和TiCl_3还原-NH_4VO_3氧化滴定法分别测量其中的ARS值和铀浓度。结果表明,ARS在可离子交换态(F1)和酸易溶态(F2)中较高(1.293~1.348),在酸可溶态(F3)中略有下降(1.204~1.229),在可氧化态(F4)中降到最低(0.917~0.934),在难溶态(F5)中又升高至1.018~1.142;浸出过程可根据ARS变化分为3个阶段:第1阶段ARS较高,在1.217~1.318之间,主要是F1、F2和F3中的U(Ⅵ)浸出;第2阶段ARS下降直至1.016,主要是F3及F4中的U(Ⅳ)溶解;第3阶段ARS在1.070~1.118之间...

In order to study the indicative function of234U/238U activity ratios (ARS) to in-situ leaching of uranium, taking uranium ore from Xinjiang as an example, sequential extraction test was adopted to separate different uranium chemical fractions, and horizontal column leaching test was applied to obtain pregnant leach solution. ARS in the chemical fractions and the pregnant leach solution were measured by ICP-MS and then uranium concentrations in leaching pregnant solution were measured by TiCl3reduction-NH4VO3oxidation titration method. The results show that ARS are higher (1.293-1.348) in exch...