Method for preparing uranium dioxide composite fuel pellets by doping graphene oxide
A technology of uranium dioxide and composite fuel, which is applied in the direction of reactor fuel material, reactor fuel element, manufacturing reactor, etc., can solve the problems of segregation, agglomeration, low uniformity and production efficiency of graphene, and the difference in density and other physical properties. Achieve the effects of improving hydrophilicity, reducing raw material costs, and improving thermal conductivity
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Embodiment 1
[0028] Example 1: Preparation of uranium dioxide composite fuel pellets
[0029] (1) Take 180 mL of uranyl nitrate solution with a concentration of 500 g / L and an acidity of 1.5 mol / L HNO 3 , to wherein adding 40g content is the graphene oxide suspension of 1% (m / m), after mixing, slowly add 400mL concentrated ammonia water, make the pH of solution be 10-12, obtain the ammonium diuranate (ammonium diuranate) containing graphene oxide ( ADU) precipitation.
[0030] (2) Filtration of the precipitate obtained in step (1), the filter cake is dried, pulverized and sieved in a vacuum drying oven to obtain an ammonium diuranate-graphene oxide composite with an average particle size of 0.1-10 μm.
[0031] (3) The ammonium diuranate-graphene oxide composite obtained in step (2) was transferred into a quartz boat, sent into a muffle furnace, heated to 350° C. by introducing nitrogen, and then heated to 550° C. and calcined for 2 hours to obtain UO 3 . The temperature was raised to 68...
Embodiment 2
[0034] Example 2: Preparation of intermediate products and detection of final uranium dioxide composite fuel pellets
[0035] The intermediate products prepared in Example 1 and the uranium dioxide composite fuel pellets finally obtained were tested as follows.
[0036] (1) Detection of uranium dioxide complex powder
[0037] According to GB / T 11847-2008 "BET Capacity Method for Determination of Specific Surface Area of Uranium Dioxide Powder", the specific surface area of uranium dioxide composite powder prepared by doping graphene oxide was tested, and the result was that the specific surface area of the composite was 10.05m 2 / g, and UO without graphene oxide 2 The specific surface area of the control sample is 3.01m 2 / g.
[0038] According to GB / T 11842-89 "Uranium dioxide powder and pellets determination of oxygen-uranium atomic ratio by thermogravimetric method", the oxygen-uranium ratio was determined, and the result was that the oxygen-uranium ratio of the ...
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