应用地球化学模式PHREEQC计算某铀矿淡化少试剂地浸新工艺现场试验浸出液的主要组分铀、碳酸衍生物的存在形式和条件.结果表明,H2CO3、HCO3^-和CO3^2-是碳酸衍生物在水中主要存在形式,UO2 (CO3)2^2-、UO2(CO3)3^4-、UO2CO3为六价铀的主要存在形式.讨论了中性条件下主要组分各种存在形式之间的转换、出铀浓度与碳酸衍生物之间的关系,揭示了地浸过程中水岩作用机理.
The existing forms and conditions of main composition, i.e., uranium and carbonic acid derivatives, of lixivium of dilution-few reagent in-situ leaching uranium ore deposit were calculated with Geochemistry Model PHREEQC. The results show that H2CO3, HCO3^- and CO3^2- are primary composition of carbonate derivatives, while UOz (CO3)2^2-, UO2 (CO3)3^4- and UO2CO3 are primary composition of hexavalent uranium. The transformation of existing forms of main composition under neutrality condition and relationship between hexavalent uranium and carbonate derivatives are investigated. The interaction mechanism between water and mine in in-situ leaching is revealed.