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Production of Nuclear Grade Uranium Trioxide by a Non-Conventional Method

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Production of Nuclear Grade Uranium Trioxide by a Non-Conventional Method EG0000334 Third Arab Conference on the Peaceful Uses of Atomic Energy, Damascus 9 -13 Dec. 1996 AAEA Production of Nuclear Grade Uranium Trioxide by a Non-Conventional Method •• •• I •• .ll**l***ll * a I II ^ 1 A I I * flLJ^J^u cLid^^l ddUul 4A gd^^uij4-«ul ^^uiial «^u . i ^ rt ( 6 i ft • ^-v \ A I I ( 6 i ^ • >^ ' A I | <!,<••) I »v.—» A I * I | <1 il^ ( (; I i ft i\ I | * . i. a Abstract A non-conventional method to produce nuclear grade uranium trioxide (orange oxide) from crude yellow cake has been proposed. The method depends on selective leaching of uranium from the yellow cake using ammonium carbonate and selective precipitation of uranyl ion from the obtained leach solution using hydrogen peroxide. In carrying out the optimization of the leaching of uranium, it was found that 130 g/L of ammonium carbonate will be required for complete dissolution of uranium from the present yellow cake at a solid/liquid ratio of 1/10, a reaction temperature of 50°C and 6 h mixing time. Nitric acid is added to the leach solution to convert uranyl carbonate solution (pH=8) to uranyl nitrate (pH=2.7). Afterwards, uranium peroxide is precipitated from the uranyl nitrate solution by adding hydrogen peroxide and ammonia solution in presence of 5% (W/V) EDTA solution for masking impurities. Finally, uranium trioxide dihydrate (UO3.2H2O) is obtained by reducing the precipitated uranium peroxide with 2M sodium thiosulphate solution at ambient temperature. Nuclear purity of the product has been confirmed by determination of trace impurities using Inductively Coupled Plasma-Mass spectrometer (ICP-MS) instrument. 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J^ \ % 1 1 j • -~ *• * 11 J.-.-..II J-^-H-11 M-g/g Mpm M-g/g u 62.58% As 180 Zn 40 B 10 Sr 5 Fe 1580 Na 150 Mo 560 Co 2 Mg 40 Cd 2 Ni 3 Al 220 Ba 8 V 5 K 60 Pb 10 Th 50 Ca 360 Ag 20 RE 6 Cr 10 Cu 20 S 150 Mn 30 Ti 75 - - ..I i - I 2 <.< I I v_, > , .'. I • j . 11 v_,lj_i — \ *:d_JLiJ| <JjLt_JJ (1) JI £^JI J-0 J J-A-t J J -I oJ I ,Jil fl'l T , X i-Jl j ^ I I *1 *fc *1 ^ I I ^j£ JLJJ-J_>^JI JJI -> i j_i jj — ^ j—J-I I j J j I I <LJJ_1_aJ I 4_jl j^ I d • ... '. J . -^". i . •. * -1 •,!> *•>. ^1 > . ^ jf I > i r -f. I ) I <*• o , <J a I i -^ • i** i Lc I • -i \ , i. V I* -f4- \: —1\» < / > I - I j a .^11 »j_j_j I j J Jl X • X fc y M. -.V H. Jjl -> r, j J _e^( jj—^J I j ** i Lc LMJ t 1 t>°jj ajl ^-> d J^LLUI <i . A i X 6jlj—aJI CJLAJJ ,\ *i T tiJJjj ^J-J-JIJJ Jl ^-jfj| ** !•' " ' ^, iVl^U 1^1"" I A II >. 5jlJA, <^ jj CJIXLLU *\ »J_oJ • • • I a ~i I I £_,, jjJ/j> I jJi. ^ X . ilj-jjl ^ljl,> .<i_iL>JI Sjj U I | i ". /• cljj ,n II 5 ~ j "• * -'' • '' jjJiJIa-^.L>i*«Jltt*&JI3LtljjtJ-a^LJI ^^Jl M-g/g u 62.5 As 28 Zn 5 B <! Sr <1 Fe 53 Na 10 Mo 110 Co <) Mg 4 Cd <1 Ni <] Al <1 Ba 1 V <1 K 8 Pb <1 Th 2 Ca 56 Ag 4 RE Cr <1 Cu 2 — Mn 3 Ti <! ^j ' ~ j j ' _' 0II ,i j in^f Jjj-i Jjl ~ - J)l * jj -• *• -11 c^LujljjJI ^jjLii +2H2O -> UO4.2H2O + 2HNO3 (2) J ' _' I (JuV (/\.) U:j_aVl Jj I — LJLAJ IjJj J-.L.JI J^LiiJI (NH4)4 UO2(CO3)3 + 6HNO3 -> UO2(NO3)2 +4NH4NO3 +3H2O +CO2 ....(3) j 0 '^Jj' *() ^ J wit^) Jjj-fi ^pl] EDTA Jjl -> r> LflLbj J-AJLJ 11J A ,/jl ia-a.^Li cu-^ j .
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