Study On The Optimization Of In-situ Leaching Uranium Hydrometallurgy Process

Since the 1960s,the process of uranium leachate treatment has been improved greatly after the application of in-situ leachate technology.Selective dissolution and leachate formation of uranium in ore are all accomplished by in-stu leaching.The proven sandstone-type uranium deposits in China account for about 22%of the country's total uranium resources and more than 70%of its output.In the introduction of foreign advanced technology of in situ leaching uranium mining,on the basis of continuous digestion and absorption,make the in-situ leaching technology to achieve rapid development of our country,but there are still insufficent,especially uranium water treatment technology progress slower,but there are some defects in the equipment,so it is necessary to select new equipment or original equipment for transformation to ensure efficient operation and improve the safety essence.The cost pressure gradually increases,further optimize the process parameters,make the process in a good state of operation,and reduce the consumption of various production materials.This topic takes the optimization of in-situ leach uranium water treatment process as the research direction,mainly on the selection and improvement of process equipment,in order to improve the efficiency and safety of the operation of process equipment,reduce the labor intensity of the operation personnel.The principles and dynamic characteristics of adsorption,leaching,transformation,rinsing and precipitation processes were studied,the technological parameters of each function were adjusted and optimized,the consumption of production materials was reduced,and the economic benefits were obtained.The main research contents and conclusions of this paper are as follows:?The leaching liquid into the flow fluctuating of adsorption process and adsorption resin according to the cycle process of the firm,resin uranium capacity is not stable,and the value is slow.The uranium capacity of the resin can be increased by adjusting the inversion standard of the resin through small adsorption test in the laboratory.Adjusting the standard for the resin dispatching according to the amount of leaching liquid into the liquid volume transship,annural average uranium capacity of resin rose**;Due to resin periodically ascend,ascension process,in turn,can according to the process design,each working procedure all share a metering tank tower,tower,centered on metering tank be evenly distributed,a reduction in the number of metering tank,conducive to cost control.?The operation data of the leaching process were analyzed statistically,the flow rate of rinsing agent into the liquid gradually decreases,the contact time between the solution and the resin is prolonged,the rinsing efficiency is guaranteed to meet the requirements,the consumption of rinsing agent is reduced,and the ammonium nitrate used to prepare rinsing agent decrease accordingly;Elution volume reduction,qualified uranium concentration increased,from the year of2015 to 2018,the uranium concentration of qualified liquid increased by**,and the consumption of precipitant in the precipitation process decresed by**;At the same time,the capacity of saturated resorption resin uranium was promoted;From the year of 2015 to 2018,the capacity of saturated resorption resin uranium increased by**;According to the amount of rinsing agent,the designed tank volume is moderate to reduce the labor demand.?The operation data of the transformation process were analyzed statistically,the inlet flow of the transformation agent decreased gradually,the contact time between the solution and the resin was prolonged,the transformation efficiency was guaranteed to meet the requirements,the consumption of the transformation agent was reduced,and the concentrated sulfuric acid used to prepare the transformation agent decreased accordingly;At the same time,the liquid phase equilibrium of hydrometallurgical process is realized,which is helpful to reduce the consumption of ammonium nitrate in preparation of leaching agent.?Running the rinsing test on the rinsing process,the optimal rinsing flow rate is from 7 to 9 m³·h^-1,and the rinsing effect is better for the resin in the tower is from 3.5 to 4 m³;The proportion of resin in the drifting particle size section decreases from 37.28%to about 6%;The annual resin consumption of large particle size can be reduced by about from31.1%R₁;Transformation of the inlet and outlet liquid pipeline of the rinsing tower,recovery of the transition solution carried by resin in the transition tower three,reduce the total volume of the transition agent,and save the concentrated sulfuric acid consumption;After the sealing cap is installed on the rinsing tower collecting tray,the randon and its daughter in the area is reduced,which is beneficial to the health of the operators;The rinsing tail liquid flowing into the collector plate is not easy to be splashed,which can avoid the electrochemical corrosion of the steel platform and prolong the service life of the steel platform.?The operation data of the precipitation process were analyzed statistically,after the adjustment of fluidized precipitation to intermittent precipitation,the average product water content decreased by**%,the total volume of mother liquor decreased,and the precipitation effect was improved,from the year of 2015 to 2018,the uranium concentration in the mother liquor decreased by**;The cycle times of slurry were tested,the increase of times of slurry circulation and the existence of bottom flow are helpful to improve product grade.