Unlock instant, AI-driven research and patent intelligence for your innovation.
Method for co-precipitation of actinides in different oxidation states and method for preparation of mixed actinide compounds
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of actinide elements and oxidation states, which is applied to the mixed oxide O2 of uranium and plutonium, the above mixed oxides, the preparation of mixed compounds of actinide elements, and the co-precipitation of various actinide elements, which can solve difficult problems
Active Publication Date: 2007-05-09
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES +1
View PDF5 Cites 12 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
The use of this co-precipitation method is not always simple, especially the stabilization of actinide (IV) mixtures requires several steps and is not easily compatible with the continuous co-precipitation operations often required for industrial manufacture
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1 to 6
[0243] The invention will now be described with reference to the following examples, which are given for purposes of illustration and not limitation.
Embodiment 1
[0245] In this example, oxalic acid solution was used to co-precipitate U(IV) and Pu(III) stabilized by hydrazine ions in solution.
[0254] Simultaneous and homogeneous co-precipitation is obtained by thoroughly mixing the actinide mixture with the precipitation solution in equal proportions at room temperature.
[0255] Calcination of the oxalate coprecipitate in argon at above 650 °C for 1 h resulted in a perfectly homogeneous mixed oxide (U,Pu)O equivalent to a solid solution 2 .
[0256] The precipitation yields of each actinide were higher than 99%.
Embodiment 2
[0258] In this example, oxalic acid solution was used to co-precipitate U(IV) and Pu(III) stabilized by hydrazine ions in solution with different ratios of uranium and plutonium.
[0268] Simultaneous and homogeneous co-precipitation is obtained by thoroughly mixing the actinide mixture with the precipitation solution in equal proportions at room temperature.
[0269] The precipitation yields of each actinide were higher than 99%.
[0270] Co-precipitates consisting of homogeneous mixed oxalates were calcined in argon at above 650 °C for 1 h, resulting in perfectly homogeneous mixed oxides equivalent to solid solutions (U 0.725 , Pu 0.275 )O 2 .
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Property
Measurement
Unit
Bronsted acidity
aaaaa
aaaaa
Login to View More
Abstract
The invention relates to a method for co-precipitation (or simultaneous preparation) of at least one actinide in oxidation state (IV) with at least one actinide in oxidation state (III), in which a mixed solution of actinide(s) in oxidation state (IV) and actinide(s) in oxidation state (III) is prepared with addition of either a mono-charged cation which stabilises the oxidation states in the mixture, or a mono-charged cation with no stabilizing role for the oxidation states in the mixture and a solution containing oxalate ions is added to said mixture of actinides to produce a co-precipitation, or simultaneous precipitation of said actinides of oxidation state (IV) and (III) and a fraction of the mono-charged cation. According to another embodiment, a mixed solution of actinide(s) in oxidation state (IV) and actinide(s) in oxidation state (III) is prepared and a solution containing oxalate ions and a mono-charged cation is added to said mixture of actinides to produce the co-precipitation. The invention further relates to mixed actinide compounds from calcination of the precipitate above. Said mixed compounds such as oxides, carbides or nitrides are particularly of use in the production of nuclear fuel, for the production of transmutation targets or for the stable storage of nuclear material.
Description
technical field [0001] The present invention relates to a method for co-precipitating actinides having different oxidation states. [0002] More specifically, the present invention relates to a method for co-precipitating (i.e. simultaneously precipitating) a plurality of actinides, wherein at least one of the actinides involved is in an oxidation state (or oxidation level, degré d'oxidation) (IV) and at least One of the actinides involved is in the oxidation state (III). [0003] The invention also relates to a process for the preparation of mixed compounds of actinides, in particular mixed oxides, nitrides or carbides of actinides. [0004] The technical field of the invention can generally be defined as the preparation of mixed compounds of actinides, such as mixed oxides of actinides, especially mixed oxides of uranium and plutonium (U,Pu)O 2 and the technical field of refractory mixed compounds including some elements of the actinide group from thorium to californium. ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
