摘要:
A spent fuel reprocessing method including the steps of partitioning U and Pu(III) in a solvent by solvent extraction and subsequently polishing the solvent in a neptunium rejection operation for removing Np therefrom. The solvent obtained from the neptunium rejection operation (the polished solvent or NpA solvent product) is then recycled to a U/Pu partitioning operation. The method enables a reduction in solvent feed and solvent effluent volumes.
摘要:
A spent nuclear fuel reprocessing method includes contacting an organic phase containing NP(VI) with an oxime of the formula R2C═NOH, where each R is independently H or an organic substituent. Np(VI) is reduced to Np(V) which is then backwashed into an aqueous phase.
摘要翻译:废核燃料后处理方法包括使含有NP(VI)的有机相与式R 2 C = NOH的肟接触,其中每个R独立地为H或有机取代基。 将Np(VI)还原成Np(V),然后将其反洗至水相中。
摘要:
Abnormal flows in an extractor are simulated, with a flow divider model and a flow merger model being introduced. Overflow state, entrainment occurrence state, and reflux state in the extractor are simulated. Moreover, abnormal flows under a variety of conditions are simulated efficiently by using object-oriented software as the simulation program.
摘要:
A spent fuel reprocessing method includes at least the formation of an aqueous solution and at least one solvent extraction step. Formohydroxarmic acid is used to reduce any Np(VI) to Np(V) and/or to form a complex with Np(IV). As a result, substantially all the neptunium present is retained in the aqueous phase during solvent extraction.
摘要:
The invention relates to novel calixarenes of formula: ##STR1## in which m is equal to 0 or 1, n is an integer from 2 to 8, with 4.ltoreq.n(m+1).ltoreq.8,R.sup.1 and R.sup.2, which can be the same or different, are alkyl or O-nitrophenoxyalkyl groups andR.sup.3 and R.sup.4, which can be the same or different, are alkyl or aryl groups.The calixarenes can be used for extracting actinides and lanthanides from aqueous solutions from spent fuel reprocessing.
摘要:
An apparatus for solvent extraction processes utilizing countercurrent flow of streams of an aqueous phase and an organic phase, such as the Purex process for uranium recovery. The invention comprises contouring the fluid passing orifices in the column phase dispersing perforated plates to impede droplet coalescence of the dispersed phase.
摘要:
The invention relates to a process for the extraction of uranium (VI) and/or plutonium (IV) present in an acid aqueous solution by means of a mixture of N,N-dialkyl amides usable for the reprocessing of irradiated nuclear fuels.In (50 or 52) contacting takes place between an aqueous solution containing U(VI) and Pu(IV) and an organic solvent incorporating a mixture of two N,N-dialkyl amides, e.g. of formulas: ##STR1## and then by separating (in 50 or 52) the organic solvent containing either U(VI) and Pu(IV), or U(VI).
摘要:
The invention relates to a process for the reextraction in aqueous solution of the plutonium present in an organic solvent, more particularly usable for uranium-plutonium separation.According to this process the organic solvent is contacted with an acid aqueous solution of uranous salt, e.g. uranous nitrate, and hydroxylamine salt, e.g. hydroxylamine nitrate. Under these conditions, the uranous nitrate acts as a reducing agent for plutonium at valency (III and the hydroxylamine nitrate, which is also a plutonium reducing, agent, stabilizes Pu(III) and U(IV) in aqueous phase.Performances comparable to those of the U(IV)-hydrazone nitrate system are obtained without forming prejudicial hydrazine nitrate decomposition products. (FIG. 2).
摘要:
Cesium is extracted from acidified nuclear waste by contacting the waste with a bis 4,4'(5) [1-hydroxy-2-ethylhexyl]benzo 18-crown-6 compound and a cation exchanger in a matrix solution. Strontium is extracted from acidified nuclear waste by contacting the waste with a bis 4,4'(5') [1-hydroxyheptyl]cyclohexo 18-crown-6 compound, and a cation exchanger in a matrix solution.
摘要:
A method for decontaminating uranium product from the Purex process comprises addition of hydrazine to the product uranyl nitrate stream from the Purex process, which contains hexavalent (UO.sub.2.sup.2+) uranium and heptavalent technetium (TcO.sub.4 -). Technetium in the product stream is reduced and then complexed by the addition of oxalic acid (H.sub.2 C.sub.2 O.sub.4), and the Tc-oxalate complex is readily separated from the uranium by solvent extraction with 30 vol. % tributyl phosphate in n-dodecane.
摘要翻译:从Purex工艺中净化铀产品的方法包括向含有六价(UO22 +)铀和七价锝(TcO4-)的Purex工艺的硝酸铀酰产物中加入肼。 产物流中的锝减少,然后通过加入草酸(H 2 C 2 O 4)络合,并且Tc-草酸盐络合物通过溶剂萃取容易地与铀分离,30体积%。 磷酸三丁酯在正十二烷中。