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Title:: Experiment on Apatite Adsorbing Uranium and Its Implication on Uranium Mineralization—Taking Xiangshan Orefield in Jiangxi as an Example

Author(s):: WANG Qian; HU Bao-qun; SONG Jin-ru; NIU Jian-guo; QIU Lin-fei; SUN Zhan-xue; LI Man-gen; LU Gu-xian; 1. Chifeng Institute of Geology and Mineral Exploration and Development of Inner Mongolia, Chifeng 024000, Inner Mongolia, China; 2.National Defense Key Laboratory of Fundamental Scienceon Radioactive Geology and Exploration Technology, East China University of Technology, Nanchang330013, Jiangxi, China; 3. Beijing Research Institute of Uranium Geology, Beijing 100029, China; 4. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Keywords:: apatite; adsorption; uranium deposit; high-grade ore; occurrence characteristic; mineralization; hydrothermal deposit; Jiangxi 

Abstract:: Uranium minerals and apatite from high-grade ores in Xiangshan orefield are closely associated, and the relationship between contents of U and P₂O₅is obvious positive. Apatite forms firstly, and then uranium is absorbed and mineralized. The adsorption behavior of apatite on uranium was studied by the means of static method, and the effects of pH value, time, temperature and mass concentration of uranium on apatite absorbing uranium were discussed. The XRD, SEM, EDS analyses before and after apatite absorbing uranium were compared. The results show that the apatite can rapidly absorb a lot of uranium in the acidweakly acid conditions within 10 min; there is no new mineral formed after the adsorption; uranium is adsorbed on the surface of apatite in amorphous substance; the adsorption can be described by Boyd liquid membrane formula and Langmuir adsorption isotherm model; the maximum adsorption of apatite on uranium is 94.3×10-3, and the half-time of adsorption is 33.97 s. The above results, which reveal the regularity of apatite adsorbing uranium, are helpful for the study on uranium enrichment mineralization effected by apatite in Xiangshan orefield.