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通常,以六价状态的铀酰离子溶液或氧化物固体从铀矿石或从核燃料再加工过程中回收铀。但要将其转变成 UF_6供同位素分离,或转变成金属铀供制备元件,可能要经过一系列过程:脱硝、沉淀、脱水、高温氢还原和氢氟化而生产出无水 UF_4。UF_4这个中间产物易于转变为金属铀或 UF_6。本文报道在有氟离子存在时,采用电解还原甲酸铀酰直接生产无水 UF_4的方法。
Uranium is typically recovered from uranium ore as uranyl ion solution or oxide solids in hexavalent state or from reprocessing of nuclear fuel. But to convert it to UF_6 for isotope separation or to metal uranium for the preparation of components, it is possible to go through a series of processes: denitrification, precipitation, dehydration, high temperature hydrogen reduction and hydrofluorination to produce anhydrous UF_4. UF_4 This intermediate is easily converted to metallic uranium or UF_6. This paper reports the direct production of anhydrous UF_4 by electrolytic reduction of uranyl formate in the presence of fluoride ions.