【摘要】 <正> 光化学还原法制备四氟化铀,虽然早在上个世纪已为人们所发现,并且以它的产品纯、操作方便和工艺简单而吸引人,但由于光源不理想,四氟化铀产率低,过去一直没有得到实际应用。本文采用较为理想的300W镓灯作光源,以乙醇作还原剂,在硝酸-氢氟酸体系中,比较系统地研究了一些因素对四氟化铀产率的影响。实验方法与我们以前发表过的工作相同。实验条件是:[U（Ⅵ）]₀=0.03M,T=30±5℃,[U（Ⅵ）]₀:[C₂H₅OH]₀:[HF]₀≈1:1:10。更多还原

【Abstract】 The effects of concentrations of HNO3,HF, UO2 2+ ion and C2H5OH on reduction yields of U(Ⅵ) and precipitation yields of UF4 at 30±5℃ by using ethanol as a reductant are investigated. Satisfactory results are obtained with a 300W "Ga-lamp", the spectrum of which matched the absorption spectra of uranyl nitrate in HNO3-HF solution. When reaction time > 30 min, for 0.023M UO2(NO3)3 -0.023M HNO3-0.3M C2H5OH-0.15M-HF system, about 100% of reduction yield of U(Ⅵ)and more than 90% of precipitation yield of U(Ⅳ) are obtained.更多还原