| Uranium ores enriched apatite, rutile, pyrite, microcrystalline quartz, carbonate and other associated minerals in Zoujiashan ore deposit. The analysis of the chemical composition of uranium ore shows that there was a positive correlation between U and TiO2, P2O5, MgO, MnO, CaO, FeO.Some of these associated minerals are euhedral, others are non-euhedral. The uranium distributed around of the associated minerals or filled in the cracks. It can be known that the uranium can be adsorbed by associated minerals for further uranium concentration and mineralization. Therefore, the adsorption plays an important role in uranium precipitation and further enriched in ore-forming process.In this paper, characteristics of Zoujiashan ore deposit, the poor and the rich ore, composition and occurrence of uranium minerals, spatial relationships to associated minerals as the main research object. The adsorption behavior of apatite, rutile and microcrystalline quartz on uranium are studied by static method for studying the influence of pH, time, temperature and concentration in the adsorption on uranium. The apatite, rutile and microcrystalline quartz of before and after adsorption was analyzed by XRD, SEM, BSE and EDS.Through the researches all above, the main conclusions are listed as following:1 Uranium minerals are closely associated with apatite, pyrite, rutile, chlorite, fluorite in Zoujiashan ore deposit. These minerals are euhedral and non-euhedralform. U and TiO2, P2O5, MgO, MnO, CaO, FeO were positively correlated in uranium ores. Amount of uranium minerals distributed in these mineral edge, cracks and cleavage plane. It can be concluded that the associated minerals are formed in advance, and the uranium is adsorbed and precipitated.2 Carried out apatite, rutile and microcrystalline quartz of uranium sorption experiments(under normal atmospheric pressure). It is known that(1) pH is 2-6, the adsorption of uranium on apatite can reach equilibrium, and the maximum adsorption capacity is 94.3 mg/g in 10 min.(2) rutile in 10 min, weak acid(pH=4.5) solution in the adsorption of uranium to obtain the maximum equilibrium adsorption capacity, the maximum adsorption is 57.38 mg/g.(3) under the acid condition, with the increase of pH, the adsorption capacity of the quartz crystal on the uranium is gradually increased. After the 4h, the reaction tends to be balanced.(4) combined with the previous adsorption experiments, it is known in acidic and weakly acidic conditions, montmorillonite, limonite, humic acid, kaolin can be widely absorb uranium.3 Macroscopic geological facts and experimental results show: the comprehensive study of the optimum adsorption conditions of uranium on the associated minerals are same to conditions of the rich uranium deposits formed. The rich ore can be formed when associated minerals with adsorption properties, uranium hydrothermal, acid environment, enough mineralization space simultaneously Rearches shows adsorption is of great significance in hydrothermal uranium mineralization. |
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