CHARACTERISTICS OF URANIUM MINERALS FROM THE MENGQIGUER SANDSTONE-TYPE URANIUM DEPOSIT IN THE YILI BASIN AND THE IM-PLICATION FOR IN-SITU LEACHING
The occurrence form of uranium in the ore of in-situ leachable sandstone-type uranium deposits directly impacts the leaching rate of uranium.The process mineralogy characteristics of the ore influence the contact between uranium minerals and the leaching solution,thereby affecting the dissolution reaction of uranium.Characterizing the occurrence form and process mineralogy characteristics of uranium in the ore deposit serves as a valuable reference for enhancing the leaching rate of uranium in in-situ leaching pro-duction.In this study,the typical ore from the L65-L0 exploration line of the Mengchiguer uranium de-posit is taken as the research object.Sequential chemical extraction,electron probe microanalysis(EP-MA),and TESCAN integrated mineralogy analysis(TIMA)are employed to analyze the occurrence state and existence form of uranium elements,as well as uranium mineral types,size,dissociation degree,asso-ciated minerals,pore size,etc.Sequential chemical extraction analysis indicates that the proportion of ac-tive uranium in the ore reaches 99.5％,with uranium primarily in the soluble carbonate binding state(50.77％-56.64％)and the iron and manganese oxide binding state(18.72％-36.08％).This suggests that uranium in the ore is readily extractable.The uranium mineral content in the study area is high,ac-counting for as much as 5％of the ore,with pitchblende constituting 4.19％and coffinite 1.56％.TIMA analysis reveals a low dissociation degree of uranium minerals,with pitchblende having less than 10％dis-sociation reaching 77.81％,and coffinite with less than 10％dissociation reaching 99.33％.This indicates that the association assembly of coffinite is more complex than that of pitchblende.Consequently,in in-si-tu leaching,the leaching efficiency of pitchblende is higher than that of coffinite.
uranium mineralsequential chemical extractionTIMAin-situ leaching of uraniumMengqiguer uranium deposit
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