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阐述了腐植酸对采用Na2CO3-NaHCO3溶液加工铀矿石过程的影响。铀矿石中存在的腐植酸导致Na2CO3-NaHCO3溶液浸出,使铀的浸出率偏低。在季铵-煤油溶液从Na2CO3-NaHCO3-[UO2(CO3)3]4--H2O体系中萃取时,铀的萃取效率明显下降,产生乳化,生成大量三相物,并且两相分离时间大大延长,降低了萃取设备的生产能力;在采用NaOH从Na2CO3-NaHCO3-[UO2(CO3)3]4--H2O体系沉淀铀的过程中,NaOH单耗量显著增大、沉淀母液中ρ(U)值上升较多。腐植酸对(NH4)2CO3-NH4OH溶液从负载铀的季铵-煤油溶液中反萃取-结晶三碳酸铀酰铵(AUC)过程,没有显示有害影响,晶体形态完整无缺陷,粗晶产率仍高于80%。
The effect of humic acid on the processing of uranium ore by Na2CO3-NaHCO3 solution is described. The presence of humic acid in uranium ore led to the leaching of Na2CO3-NaHCO3 solution, leaving uranium leaching rate low. When the quaternary ammonium-kerosene solution was extracted from Na2CO3-NaHCO3- [UO2 (CO3) 3] 4-H2O system, the extraction efficiency of uranium decreased obviously, resulting in the emulsification and the generation of a large amount of three-phase materials, and the separation time of the two phases was greatly prolonged (UO2 (CO3) 3] 4 - H2O system is used to precipitate uranium, the consumption of NaOH significantly increases. The ρ (U) The value rises more. Extraction of humic acid from (NH4) 2CO3-NH4OH solution from a quaternary ammonium-kerosene solution loaded with uranium led to the crystallization of ammonium uracil trioctylate (AUC) without any deleterious effects and the crystal morphology was intact and the crude crystalline yield Higher than 80%.