Site Conditions Experiments For Field Test On In-situ Leaching And Hydrodynamic Simulation Of Uranium In Bayan-Uul

Sandstone type U-ore isakey point of uranium mininginourcountry,whichmainbaseisin Nei Monggol.The Bayan-Uul uranium isthefirstsandstone type U-oreminedin Nei Monggol,it hasthe characteristics oflowgrade,heavy sandy layersandhigh permeability.This article in predecessors' laboratory test foundation,begins by site conditions experiments studies characteristic andpracticability of acid in-situ leaching in this uranium.Finally,the seepage characteristics of different pumping and injection rate and distance are studied by Visual MODFLOW though creatinghydrodynamic model of testing ground.Site conditions experimental results show that,theacidic in-situ leaching process accommodates Bayan-Uul uranium,and antioxidants can contribute leaching.During the site conditions experimental,the leach solution average U concentration of CDI-1and CDI-2 units are 19.61mg/Land 46.69mg/L.By the end of the experiment,the leach solution average U concentration are 18mg/Land 30mg/L.Leaching result of the units are related with the ore grade,deposit thickness,square amount of uranium and geochemical environment.High acidity can keep high uranium concentration.Under leaching solution acidity equal to10g/Lconditions,the units' leach solution average U concentration are 21.72mg/Land 54.57mg/L,which are 1.05 and 1.18 times of acidity equal to 8/Lconditions.The result of the simulation shows that under pumping out-in balance conditions,theaverage hydraulic gradients of the units increase with the increase of pumping rate,reduced with the increase ofhole distance.Theleachingeffective areaincrease with the increase of pumping rateandhole distance.Theutilizationof leaching solutionincrease with the increase of pumping rate,reduced with the increase ofhole distance.Under pumping out-in balanceandfourpumping wellswithone injection hole conditions,whenthe hole distanceis30 mandthepumping rateis12m3/h,theseepage velocityofleaching solutionisgoodforleaching result,andtheleachingeffective areais6280m2,the utilizationof leaching solutionisaboveThis paper has instruction significance for determiningin-situ leaching process technique parameter and craft process of Bayan-Uul uranium,and useful for determiningthe hole distance.