Effect of different leaching agents on re-adsorption behavior of ionic rare earths
In the in-situ leaching of ionic rare earth ores,when leaching mother liquor flows through regions that have not been leached or through barren layers,rare earth ions are subjected to re-adsorption onto the surfaces of mineral soil particles.This leads to a reduction in the concentration of rare earth ions in the leaching solution,thereby impacting the efficiency of rare earth extraction.This paper focuses on the influence of different leaching agents on the re-adsorption behavior of ionic rare earth.It researches the flow dynamics of leaching solutions with different concentrations and valences of cations,the patterns of leachate concentration changes,and the extent of re-adsorption mass during the leaching process.Utilizing nuclear magnetic resonance(NMR)technology to obtain the T2 patterns of soil,this study analyzes the regularities in the variation of macropore quantities.It elucidates the mechanisms of action of different leaching agents during the re-adsorption of rare earth ions.The results show that the higher the concentration of leaching agent,the more obvious the non-uniform flow phenomenon,the larger the concentration peak,and the smaller the re-adsorption mass of rare earth ions.Compared with ammonium sulfate and magnesium sulfate,the non-uniform flow phenomenon of aluminum sulfate solution is the most obvious,the concentration peak is the fastest,and the re-adsorption quality of rare earth ions is the least.With the increase of leaching agent concentration,the number of macropores in the sample decreases gradually.Compared with ammonium sulfate and magnesium sulfate,the aluminum sulfate solution has the largest number of macropores in the sample.The optimal concentration of the leaching agent is 8 g/L,and the ionic valence state is+3.
ionic rare earth orere-adsorptionconcentration and valencepore
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