Coupling model of reservoir deformation-fluid flow-chemical reaction-microbial growth for microorganism assisted uranium leaching
To study the influence of microbial behavior characteristics and process parameters on the in-situ leaching of uranium in the process of microbial leaching of uranium,a microbial leaching uranium coupling model considering reservoir deformation,material migration and transfer,and chemical reaction of microbial growth was established.Based on the engineering background of a sandstone-type uranium mine in Ili Basin,Xinjiang,COMSOL Multiphysics finite element analysis software was used to simulate the process of microbial leaching of uranium.The results showed that,in the process of micro-bial leaching of uranium,the uranium concentration in the leaching solution gradually increased after the start of leaching,reached the peak value around 400 days,and finally decreased slowly.From the analy-sis of a five-point pumping well and injection well unit scale,a reaction dead angle in the process of in-situ leaching of uranium was found.The higher the flow rate of extraction and injection was,the higher the peak value of uranium concentration in the leaching solution could be reached.The number of micro-organisms was positively correlated with the reversible desorption rate and the maximum specific growth rate,and negatively correlated with the reversible adsorption rate and the specific decay rate.The evolu-tion law of permeability near the pumping well and the injection well was also different due to the differ-ent fluid pressures.The research results had a certain guiding significance for the microbial uranium leac-hing process.
microorganismin-situ leaching of uraniumnumerical simulationmultiphysics coupling
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