The Geochemical Experimental Study on the Relationship between Uranium and Phosphor in Xiangshan Rich Uranium Mineralization

The apatite plays an important role in Xiangshan rich uranium mineralization. The chemical component and mineral composition of phosphor-bearing minerals in rich uranium ores have been extensively analyzed. The geochemical experiments and thermodynamic calculation have been carried out to simulate the uranium mineralization in order to study the relationship between uranium and phosphor in Xiangshan rich uranium mineralization. The results show that pH not the redox condition is the key factor to the apatite precipitation. During uranium mineralization, firstly amorphous phosphorous substances adsorb uranium and then U, P co-precipitation in weak acid condition. Subsequently apatite crystallization make the separation uranium from apatite, as a result, which leads to formation of extremely-rich uranium ore bodies. This research presents a good explanation of co-existence of apatite and rich uranium ores.