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有色金属(冶炼部分):2021,(8):81-86
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柠檬酸溶浸硬岩铀矿的浸出特征及铀形态研究
徐玲玲1, 张一诺2, 周义朋1, 刘莎莎2, 蔡佳依2, 童敏杰2
(1.东华理工大学 核资源与环境国家重点实验室;2.东华理工大学 水资源与环境工程学院)
Study on Citric Acid Leaching Performance and Uranium Form of Hard-rock Uranium Ore
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投稿时间:2021-06-10     修订日期:2021-06-13     录用日期:2021-06-15     网络发布日期:2021-07-29
中文摘要: 对硬岩铀矿开展柠檬酸溶浸试验。结果表明,0.1 mol/L的柠檬酸浸出120 h的铀浓度为208 mg/L,浸出率达到41.2%,比稀硫酸(pH=2.0)浸出率(3.7%)高37.5个百分点,且酸碱平衡后,柠檬酸与铀矿的络合作用明显;柠檬酸铀酰结合Fe3+的[FeUO2OHCit]+形态占比达到62.18%,为浸出液中的优势形态,对Fe3+的亲和性有利于铀矿中U(Ⅳ)氧化溶浸;质谱还检测到[UO2H2Cit]+、[UO2H2CitH3Cit]+、[UO2H2Cit(H3Cit)2]+、[UO2H2CitH2O]+和[(UO2H2Cit)2H3Cit]2+等形态;溶浸过程中CaCO3饱和指数始终为负值,溶浸过程中CaCO3处于未饱和状态,不易形成沉淀;柠檬酸溶浸硬岩铀矿可行。
中文关键词: 铀矿  柠檬酸  柠檬酸铀酰  PHREEQC
Abstract:Test of citric acid leaching was performed on hard-rock uranium ore. The results show that uranium concentration is 208 mg/L after 120 h of leaching with 0.1 mol/L citric acid, and uranium leaching rate is 41.2%, 37.5 percent points higher than that with dilute sulfuric acid (pH=2.0) leaching. In addition, after reaching acid-base equilibrium, citric acid and uranium ore show significant complexation. Form of [FeUO2OHCit]+ from combination of uranyl citrate with Fe3+ accounts for 62.18%, being the dominant form in leachate. Affinity to Fe3+ is favorable for oxidative leaching of U(Ⅳ) in uranium ore. [UO2H2Cit]+, [UO2H2CitH3Cit]+, [UO2H2Cit(H3Cit)2]+, [UO2H2CitH2O]+, [(UO2H2Cit)2H3Cit]2+ and other forms are detected by mass spectrum. During leaching, CaCO3 saturation index (SI) remains negative, indicating its unsaturated state, therefore not easy to precipitate. It is feasible to leach hardrock uranium ore with citric acid.
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基金项目:国家自然科学基金资助项目(41772266);江西省教育厅科技计划项目(GJJ160563)
引用文本:
徐玲玲,张一诺,周义朋,刘莎莎,蔡佳依,童敏杰.柠檬酸溶浸硬岩铀矿的浸出特征及铀形态研究[J].有色金属(冶炼部分),2021(8):81-86.
XU Ling-ling,ZHANG Yi-nuo,ZHOU Yi-peng,LIU Sha-sha,CAI Jia-yi,TONG Min-jie.Study on Citric Acid Leaching Performance and Uranium Form of Hard-rock Uranium Ore[J].Nonferrous Metals (Extractive Metallurgy),2021(8):81-86.

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