Application of Refinement in"111"Product Quality Improvement
The fine management model was introduced in a"CO2+O2"in-situ leaching uranium mine in Inner Mongolia,and the processes of adsorption,leaching,acidification and precipitation which af-fect the quality of production were carefully managed.The preparation of eluent was optimized from"settling mother liquor+sodium bicarbonate+hydrochloric acid+sodium chloride"to"settling mother liquor+sodium bicarbonite+water",the pH of eluent was maintained at 9.5～10.0,and reducing the accumulation of chloride ion in the system.The peak mass concentration of uranium in the eluate was increased and maintained at 80～130 g/L.The amount of hydrochloric acid added in the acidification process is automatically controlled,the pH is accurately controlled in 4.5～4.6,and the ratio of carbon to uranium in the qualified liquid is further reduced.Adjust the flow rate of leachate to keep the average mass concentration of uranium in 30～70 g/L,to reduce the influence of mass con-centration of uranium on product quality.Control slurry precipitation time,to improve slurry pressure filtration effect.After the optimization of production parameters,the moisture content of the product decreased by 8.50％,the uranium content increased by 2.88％,and the product quality was improved as a whole.
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