核化学与放射化学2024，Vol.46Issue(6)：587-593,7.DOI:10.7538/hhx.2024.46.06.0587
利用CHEMSPEC软件计算某铀矿浸出液中铀和其他特征元素的种态分布
Predicted Chemical Speciation Distribution of Uranium and Other Elements in Leaching Solution From Specific Uranium Deposit by Using CHEMSPEC Software
陈亚雯 1周万强 2刘正邦 3郭宁 1牛玉清 3王祥云 1翁海成 3刘春立1
作者信息
- 1. 北京分子科学国家研究中心,放射化学与辐射化学重点学科实验室,北京大学化学与分子工程学院,北京 100871
- 2. 北京分子科学国家研究中心,放射化学与辐射化学重点学科实验室,北京大学化学与分子工程学院,北京 100871||铜陵学院建筑工程学院,安徽铜陵 244061
- 3. 核工业北京化工冶金研究院,北京 101149
- 折叠
摘要
Abstract
During the in-situ leaching process of uranium,both the chemical composition of the leaching solution and the in-situ hydrogeochemical conditions can affect the chemical speciation of uranium.The chemical speciation of uranium significantly impacts its physicochemical behaviors during the in-situ leaching process.In this study,a speciation analysis software called CHEMSPEC,developed by Peking University,was used to calculate the speciation and speciation distribution of uranium and other specific elements in the leaching solution of a certain uranium mine.The effects of key factors was investigated such as pH and initial uranium concentration on uranium speciation and its distribution.The results show that the chemical speciation of uranium is greatly influenced by pH and initial uranium concentration.Uranium can precipitate as rutherfordine at acidic conditions(pH≈5.0),and the amount of precipitation increases with the increment of initial uranium concentration.The rutherfordine precipitation can dissolve when pH increases to 5.5.Calcium and magnesium exist in the form of free Ca2+and Mg2+under strong acidic conditions,and they can form dolomite and magnesite precipitates when pH＞6.6.The dominant speciation of bicarbonate salts exists as water-soluble CO2 under acidic conditions,and they transform into CO2-3 under alkaline conditions.The carbonate species that participate in the precipitation of magnesite and dolomite under alkaline conditions constitute only about 5％of the total amount.Sulfur is in the form of free SO4-in the in-situ leaching solution system under the studied pH conditions,and its speciation distribution is less relevant to pH.The speciation distribution of uranium and other characteristic elements in the in-situ leaching solution and the possible precipitates that may form are of great significance in improving the leaching efficiency of uranium.关键词
地浸采铀/种态分布/铀/地球化学计算Key words
in-situ leaching of uranium/speciation distribution/uranium/geochemical modeling分类
能源科技引用本文复制引用
陈亚雯,周万强,刘正邦,郭宁,牛玉清,王祥云,翁海成,刘春立..利用CHEMSPEC软件计算某铀矿浸出液中铀和其他特征元素的种态分布[J].核化学与放射化学,2024,46(6):587-593,7.
