铀矿尾矿中U 、Th和226Ra浸出特性研究  

Leaching Characteristics of U,Th,226 Ra From Uranium Tailings

作　　者：谢添 朱君[1] 石云峰[1] 陈超[1] 张艾明[1] XIE Tian;ZHU Jun;SHI Yun-feng;CHEN Chao;ZHANG Ai-ming(China Institute for Radiation Protection Key laboratory of nuclear environmental simulation and evaluation technology,Taiyuan 030006,China)

机构地区：[1]中国辐射防护研究院核环境模拟与评价技术重点实验室,太原030006

出　　处：《核电子学与探测技术》2020年第3期493-499,共7页Nuclear Electronics & Detection Technology

摘　　要：选择中国北方某铀矿作为研究对象,通过静态溶浸实验初步研究了pH、固液比和浸出时间对铀尾矿中U、Th、26Ra浸出的影响,分析了不同pH条件下U(Ⅵ)及Th(Ⅳ)在浸出液中的赋存形态,并利用收缩核模型分析了不同pH条件下U、Th8SRa的浸出机制。实验结果表明:溶浸液pH越小越有利于U、Th的浸出;一定范围内固液比越小越有利于U.28Ra的浸出,对Th的浸出影响较小;不同浸出时间下U、Th2Ra的浸出趋势可分为速浸出阶段、缓慢浸出阶段和浸出平衡阶段。A uranium mine in northern China was selected as the research object.Static leaching experiments were carried out for studying the effects of pH,solid liquid ratio,and leaching time on the leaching behaviors of U,Th,and26 Ra.The morphology of U(Ⅵ)and Th(Ⅳ)in the leaching solution under different pH conditions was analyzed and the leaching mechanisms of U,Th,and6 Ra under different pH conditions were analyzed by using a shrinking core model.The experimental results show that the lower the pH of the leaching solution,the better the leaching of U and Th;the smaller the solid liquid ratio in a certain range,the better the leaching of U,220 Ra,the solid-liquid ratio has a small effect on the leaching of Th;The leaching trends of U,Th,226 Ra can be divided into rapid leaching stage,slow leaching stage,and leaching equilibrium stage.

关 键 词：铀尾矿 U TH 226RA 溶浸实验 

分 类 号：X591[环境科学与工程—环境工程]