Uranium removal from mining water using Cu substituted hydroxyapatite

JOURNAL OF HAZARDOUS MATERIALS

卷:392

Article

Szenknect, Stephanie¹  Mesbah, Adel¹  Descostes, Michael²  Maihatchi-Ahamed, Abdoulaye¹  Bonato, Laura¹  Massonnet, Malvina¹  Ziouane, Yannis¹  Vors, Evelyne³  Vercouter, Thomas³  Clavier, Nicolas¹  Lautru, Joseph¹  Dacheux, Nicolas¹ 

[1] Univ Montpellier, ICSM, CEA, CNRS,ENSCM, Bagnols Sur Ceze, France

[2] ORANO Mines, R&D Dept, 125 Ave Paris, F-92330 Chatillon, France

[3] Univ Paris Saclay, CEA, Den Serv Etud Analyt & React Surfaces SEARS, F-91191 Gif Sur Yvette, France

关键词: Uranium;    Mining water;    Remediation;    Copper substituted hydroxyapatite;    Meta-torbernite;   

DOI  :  10.1016/j.jhazmat.2020.122501

来源: Elsevier

【 摘 要 】

In this study, synthetic copper substituted hydroxyapatite (Cu-Hap), CuxCa10-x(PO4)(6)(OH)(2) were prepared by co-precipitation method and were used as reactive materials in batch experiments to immobilize uranyl. The limit of incorporation of Cu into a single-phased Cu-Hap reached x(Cu) <= 1.59. The synthetic Cu-Hap samples obtained with various Cu contents were contacted with synthetic uranyl doped solutions and with real mining waters showing various pH and chemical compositions. A fast and strong decrease of the uranium concentration was observed, followed by the establishment of an equilibrium after 1-4 days of contact with the solutions. Examination of the solid phase after uranium uptake was performed using a combination of techniques. Depending on the composition of the solution and the copper content of the Cu-Hap, various mechanisms of uranium removal were observed. Based on the experimental results and geochemical simulations, it appeared that the main interest for using Cu-Hap is to enlarge the domain of water compositions for which the precipitation of meta-torbernite, (H3O)(0.4)Cu-0.8(UO2)(2)(PO4)(2 center dot)7.6 H2O is the predominant mechanism associated to the uranium removal, especially for pH > 6.7 where carbonate uranium species are predominant.

【 授权许可】

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