Inverse Modeling of Spatial Evolution of Mineral Dissolution/Precipitation Amounts in Acid In-situ Leaching of Uranium
In the process of in-situ leaching for uranium extraction,not only the uranium minerals dissolve,but also significant of other minerals dissolve along the flow path of leach solution and the amount of mineral dissolution and precipitation(formation)along the flow direction of the leaching solution increases with the extension of the migration distance of the leaching solution.Taking the southern pumping unit of C12 mining area of Bayan-Ula uranium mine as the research object,the spatial distribution characteristics and patterns of mineral dissolution and precipitation(formation)along the transport pathway of leaching solution were discussed by using reverse simulation method.The results show that:When the leachate runoff reaches 27.10 meters in the process of acid leaching uranium,the dissolved minerals mainly include anorthite(16.95 g/L),albite(2.8 g/L),potassium feldspar(2.00 g/L),hematite(8.74 mg/L)and pyrite(7.72 mg/L).The precipitated minerals are mainly gypsum(10.45 g/L),and the newly formed minerals are mainly illite(13.65 g/L)and kaolinite(3.90 g/L).The spatial evolution pattern of mineral dissolution and precipitation demonstrates a consistent increase along the leach solution flow path.Clayification alteration of feldspar and gypsum precipitation are important mechanisms that cause blockage of ore-bearing layer in uranium leaching by acid method.
acid in-situ leaching of uraniumdissolution amountprecipitation(formation)amountinverse modelingspatial evolution
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