摘要
放射性矿物以及放射性伴生矿物在开采过程中,由于岩石破碎处理,改变了矿石原有的物理结构,引起氡气射气系数和迁移特性的改变,造成尾矿氡气排放超标等环境问题。测定尾矿射气系数以及研究射气系数主要影响因素,对尾矿氡气防护与治理具有重要意义。本文以铀矿尾矿射气系数为研究对象,搭建了射气系数测量装置,并利用装置测量了不同粒径和温度条件下样品的射气系数。依据实验数据建立了射气系数与温度和粒径的关系和经验公式。实验结果表明,在5目~30目的粒径范围内,射气系数与样品成幂指数关系,随着样品粒径减小而增大;射气系数与温度存在正相关性,在20~40℃范围内,存在线性关系。得到的经验公式可用于铀矿尾矿氡气浓度模拟计算,为尾矿氡气治理提供基础数据。
During the mining process of radioactive minerals and their associated radioactive minerals,the crushing of rocks alters the original physical structure of the ores,leading to changes in the radon emanation coefficient and its migration characteristics.This causes environmental issues such as excessive radon emissions from tailing.Determining the radon emanation coefficient of tailing and studying the main factors affecting the emanation coefficient are of great significance for the protection and management of radon in tailing.This paper focuses on the radon emanation coefficient of uranium mine tailing,establishes a measurement device for the emanation coefficient,and uses the device to measure the emanation coefficient of samples under different particle sizes and temperature conditions.Based on experimental data,relationships and empirical formulas between emanation coefficient and temperature and particle size were established.The experimental results show that within the particle size range of 5 to 30 mesh,the emanation coefficient is in a power-law relationship with the sample size,thus increasing as the sample size decreases;there is a positive correlation between the emanation coefficient and temperature,with a certain linear relationship within the temperature range of 20-40℃.The empirical formulas derived in this paper can be used for simulating radon concentration in uranium mine tailing,providing basic data for the management of radon in tailing.
作者
邓豪
张庆贤
金益帆
谷懿
DENG Hao;ZHANG Qingxian;JIN Yifan;GU Yi(Sichuan Provincial Key Laboratory of Geological Nuclear Technology,Chengdu University of Technology,Chengdu 610059;CGN Cangnan Nuclear Power Co.Ltd.,Zhejiang Wenzhou 325000)
出处
《辐射防护》
CAS
CSCD
北大核心
2024年第3期275-281,共7页
Radiation Protection
基金
四川省科技计划项目(2021JDTD0018)。
关键词
铀矿尾矿
氡
温度
粒径
射气系数
uranium mine tailing
radon
temperature
particle size
emanation coefficient
