期刊论文

Experimental Study on Pore Characteristics and Radon Exhalation Rate of Solidified Uranium Tailings Based on Nuclear Magnetic Resonance Measurement

中文

矿冶工程

0253-6099

2020

40

3

4-9

10.3969/j.issn.0253-6099.2020.03.002

11475081:国家自然科学基金 11875164:国家自然科学基金 17B228:湖南省教育厅优秀青年项目 2018YKZX1004:铀矿冶放射性控制技术湖南省工程研究中心、湖南省铀尾矿库退役治理技术工程技术研究中心联合开放课题 2019KFZ01:核燃料循环技术与装备协同创新中心开放基金项目

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为了研究不同掺合料及掺量铀尾砂固化体孔隙特征与氡析出率之间的关系,分别采用15%、20%和25%的粉煤灰、矿渣粉或矿渣粉+粉煤灰对铀尾砂进行固化处理。采用核磁共振技术测量固化体试样的孔隙特征,并采用RAD7测氡仪测量试样的累积氡浓度,得出不同固化体试样的氡析出率。结果表明,随着掺合料掺量增加,核磁共振T_2分布曲线向左偏移,峰值幅度降低,试样内部孔隙逐渐演化为小孔径孔隙;固化体试样的氡析出率与孔隙度均随掺合料掺量增加而逐渐降低,氡析出率与孔隙度之间呈正相关关系,25%掺量矿渣粉固化体试样的氡析出率与孔隙度最低,分别为0.136 Bq/(m~2·s)和9.83%;掺量相同时,孔隙度与氡析出率最低的为...

In order to explore the relationship between the pore characteristics and radon exhalation rate of uranium tailings solidified by using different admixtures at a different amount, experiments on solidification treatment were performed by respectively using fly ash (FA), slag powder (GGBS) or slag powder plus fly ash at an amount of 15%, 20%, and 25%, respectively. Then, the pore characteristics of the solidified uranium tailings sample were measured by using nuclear magnetic resonance technology (NMR) and the radon exhalation rates of different...