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Li L, Lv J, Liu W, Ma Q, Tan W. Study on uranium leaching from uranium purification residue with ammonium hydrogen fluoride. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2024; 276:107441. [PMID: 38677042 DOI: 10.1016/j.jenvrad.2024.107441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 04/16/2024] [Accepted: 04/20/2024] [Indexed: 04/29/2024]
Abstract
Residues generated from the uranium purification process, characterized by a high uranium content, pose a significant challenge for recovery through leaching and present a considerable environmental threat. After using XRD and SEM-mapping characterization analysis combined with the BCR continuous graded extraction test to analyze the content of different states of uranium, it was found that the main reason why the uranium in the residue was difficult to leach because it was encapsulated by SiO2 crystals. Using NH4HF2 as a leaching agent, a leaching study of uranium in the residue was carried out, and the results showed that the H+ and F- produced by NH4HF2could react with SiO2, destroying the crystal lattice of SiO2 and causing the encapsulated uranium to come into contact with the leaching agent, facilitating the leaching of uranium in the residue. The optimum conditions for uranium leaching were 10% mass fraction of NH4HF2, a liquid-solid ratio of 30:1, a reaction temperature of 30 °C and a reaction time of 120 min, and the leaching efficiency of uranium from the residue was as high as 98.95%. The leaching kinetics of uranium by NH4HF2 were consistent with the mixed controlled model in the shrinking core models, indicating that the surface chemical reaction and mass diffusion dominated both uranium leaching processes. This may provide a viable method for resource recovery and the treatment of uranium purification residues.
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Affiliation(s)
- Lingxin Li
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, China.
| | - Junwen Lv
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, China; Hengyang Key Laboratory of Contamination Control and Remediation, Hengyang, 421001, China.
| | - Wang Liu
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, China
| | - Qiang Ma
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, China; Hengyang Key Laboratory of Contamination Control and Remediation, Hengyang, 421001, China
| | - Wenfa Tan
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, China; Hengyang Key Laboratory of Contamination Control and Remediation, Hengyang, 421001, China
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Wang Q, Huang T, Du J, Zhou L. Enhancement of Uranium Recycling from Tailings Caused by the Microwave Irradiation-Induced Composite Oxidation of the Fe-Mn Binary System. ACS OMEGA 2022; 7:24574-24586. [PMID: 35874237 PMCID: PMC9301716 DOI: 10.1021/acsomega.2c02392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The extraction of uranium (U)-related minerals from raw ore sands via a leaching procedure would produce enormous amounts of tailings, not only causing radioactivity contamination to surroundings but also wasting the potential U utilization. Effective recycling of U from U tailings is propitious to the current issues in U mining industries. In this study, the influence of the composite oxidation of Fe(III) and Mn(VII) intensified by microwave (MW) irradiation on the acid leaching of U from tailings was comprehensively explored in sequential and coupling systems. The U leaching activities from the tailing specimens were explicitly enhanced by MW irradiation. The composite oxidation caused by Fe(III) and Mn(VII) further facilitated the leaching of U ions from the tailing under MW irradiation in two systems. Maximum leaching efficiencies of 84.61, 80.56, and 92.95% for U ions were achieved in the Fe(III)-, Mn(VII)-, and Fe(III)-Mn(VII)-participated coupling systems, respectively. The inappropriateness of the shrinking core model (SCM) demonstrated by the linear fittings and analysis of variance (ANOVA) for the two systems explained a reverse increase of solid cores in the later stage of leaching experiments. The internal migration of oxidant ions into the particle cores enhanced by MW accelerated the dissolution of Al, Fe, and Mn constituents under acidic conditions, which further strengthened U extraction from tailing specimens.
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Affiliation(s)
- Qingxiang Wang
- School
of Safety Engineering, China University
of Mining and Technology, Xuzhou 221116, China
| | - Tao Huang
- School
of Safety Engineering, China University
of Mining and Technology, Xuzhou 221116, China
- School
of Materials Engineering, Changshu Institute
of Technology, Suzhou 215500, China
- Suzhou
Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu 215500, China
| | - Jing Du
- School
of Materials Engineering, Changshu Institute
of Technology, Suzhou 215500, China
| | - Lulu Zhou
- School
of Materials Engineering, Changshu Institute
of Technology, Suzhou 215500, China
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Yin M, Sun J, He H, Liu J, Zhong Q, Zeng Q, Huang X, Wang J, Wu Y, Chen D. Uranium re-adsorption on uranium mill tailings and environmental implications. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:126153. [PMID: 34492934 DOI: 10.1016/j.jhazmat.2021.126153] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Revised: 05/15/2021] [Accepted: 05/15/2021] [Indexed: 06/13/2023]
Abstract
Uranium mill tailings (UMTs) are one critical source of environmental U pollution. Leaching test has been extensively used to reveal U release capacity and mechanism from UMTs, while little attention has been paid to the effects of re-adsorption process on U release. In this study, the role of U re-adsorption behaviors during leaching test with UMTs was comprehensively investigated. Through paired data on mineralogical composition and aqueous U speciation, the influence of environmentally relevant factors on U re-absorption capacity and mechanism on UMTs with different particle sizes was revealed. Significant amounts of U re-adsorption were observed and primarily attributed to the adsorption on chlorite, albite and muscovite as well as combined reduction-sequestration by muscovite. Uranium re-adsorption predominantly occurred via inner-sphere complexation and surface precipitation depending on leachant pH. Coexisting sulfate or phosphate could further enhance U re-adsorption. The enhanced re-adsorption from sulfate occurred when inner-sphere complexation governed the re-adsorption process. These findings suggest that the environmental hazards and ecological risks of the U containing (waste) solids might have been underestimated due to the ignorance of the re-adsorption process, since the re-adsorbed U could be easily re-mobilized. The insights from this study are also helpful in developing effective in-situ remediation strategies.
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Affiliation(s)
- Meiling Yin
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Jing Sun
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Hongping He
- Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Juan Liu
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Qiaohui Zhong
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Qingyi Zeng
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Xianfeng Huang
- School of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Jin Wang
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou 510006, China.
| | - Yingjuan Wu
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
| | - Diyun Chen
- Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou 510006, China
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Facile extractive separation studies of uranium(VI) assisted by dicyclohexano-18-crown-6 through green approach. J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07698-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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