The extraction behavior of N,N-diethyl-N,N-dibenzenyl-urea(DEDBU)and N,N-dimethyl-N,N-dibenzenyl-urea(DMDBU)to uranium(VI)and thorium(IV)from nitric acid solution was studied by using xylene or chloroform as d...The extraction behavior of N,N-diethyl-N,N-dibenzenyl-urea(DEDBU)and N,N-dimethyl-N,N-dibenzenyl-urea(DMDBU)to uranium(VI)and thorium(IV)from nitric acid solution was studied by using xylene or chloroform as diluent.The effect of aqueous HNO3 concentration,extractant concentration,salting-out agent concentration and aqueous UO2+2/Th4+concentration on extraction distribution ratio of U(VI)and Th(IV)was determined.The results show that the extraction behavior of the extractants DEDBU and DMDBU to U(VI)is similar to that of TBP,the solvation numbers both are two.Under the experimental condition,the extractants DEDBU and DMDBU do not show the extraction behatvior to Th(IV).This means that the estractants may have potential application to separate U(VI)and Th(IV).展开更多
Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and hydrometallurgy.In this work,the extraction behavior of TBMA employing n hexane 20% n octanol,benz...Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and hydrometallurgy.In this work,the extraction behavior of TBMA employing n hexane 20% n octanol,benzene and toluene as diluents toward Tb(Ⅲ) has been investigated.The effect of the concentrations of nitric acid,lithium nitrate and extractant and also the temperature on the extraction distribution ratio has been studied in different diluents.The stoichiometry of the extracted species of Tb(Ⅲ) conforms to be Tb(NO 3) 3·3TBMA.An attempt has been made to determine the structure of the extracted species based on the data of IR and mole展开更多
文摘The extraction behavior of N,N-diethyl-N,N-dibenzenyl-urea(DEDBU)and N,N-dimethyl-N,N-dibenzenyl-urea(DMDBU)to uranium(VI)and thorium(IV)from nitric acid solution was studied by using xylene or chloroform as diluent.The effect of aqueous HNO3 concentration,extractant concentration,salting-out agent concentration and aqueous UO2+2/Th4+concentration on extraction distribution ratio of U(VI)and Th(IV)was determined.The results show that the extraction behavior of the extractants DEDBU and DMDBU to U(VI)is similar to that of TBP,the solvation numbers both are two.Under the experimental condition,the extractants DEDBU and DMDBU do not show the extraction behatvior to Th(IV).This means that the estractants may have potential application to separate U(VI)and Th(IV).
文摘Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and hydrometallurgy.In this work,the extraction behavior of TBMA employing n hexane 20% n octanol,benzene and toluene as diluents toward Tb(Ⅲ) has been investigated.The effect of the concentrations of nitric acid,lithium nitrate and extractant and also the temperature on the extraction distribution ratio has been studied in different diluents.The stoichiometry of the extracted species of Tb(Ⅲ) conforms to be Tb(NO 3) 3·3TBMA.An attempt has been made to determine the structure of the extracted species based on the data of IR and mole