Separation of Rare Metal Fission Products in Radioactive Wastes in New Directions of Their Utilization
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1 Separation of Rare Metal Fission Products in Radioactive Wastes in New Directions of Their Utilization Masaki OZAWA 1,2, Tatsuya SUZUKI 2, Shinich KOYAMA 1 and Yasuhiko FUJII 2 1 Japan Nuclear Cycle Development Institute (JNC) 2 Tokyo Institute of Technology (TITECH) JAPAN
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3 Salt-Free Radio Activity Introduction-1 Separation Transmutation Utilization Green Chemistry Environment Isotope Sptn. Radioactive Waste 2 Non Proliferation Functional Material Nano-tech
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5 Introduction-3 4 Fuel Cell One of the Essential Issues on the Practicability of Fuel Cell is Cost Minimization by Decreasing Consumption of Platinum Element Catalysts; News, 27 July., Re Resource Russia extracted Re (ReS 2?) from Volcano gas of Kudryavy at Etorohu Island. Annually 500 kg (possible max.20 ton) of Re will be produced; News, 11 Sep., 2003.
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7 RMFP in SNF-1 Rare metal Ru Rh Pd Tc Te Se Note Amount (kg/hmt) FBR-SF;150,000MWd/t, Cooled 4 years. Spent Nuclear Fuel, As an Artificial Ore Concentration Factor( / ) 1.E+07 1.E+06 1.E+05 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 Tc 5 th Series Elements 4 th Series Elements 1.E-01 Rb Sr Y Zr NbMo Tc Ru RhPd Ag Cd In Sn Sb Te I Xe Pd Te Se 5 th Series Elements : Elements in the FBR-S.F. (g/t), : Elements in the Earth Crust (g/t) 6
8 RMFP in SNF-2 Fig. Specific Radio Toxicity Hazard Index of RMFP in FR Spent Fuel after 4 years cooling. Specific Radiotoxicity (-/g) 1.E+06 1.E+03 1.E+00 Te Pd Tc Se Rh Ru 1.E Time after separation (year) Specific Activity (Bq/g) Time after separation (year) Fig. III-1 Time Dependency of Specific Activities of Fission Rare Te Pd Tc Se Rh Ru Fig. Time Dependency of Specific Activities of RMFP Separated from the FBR Spent Fuels cooled for 4 years Clearance levels are proposed by IAEA TECDOC-855 from 10-1 to 10 3 Bq/g, for instance, 0.1 Ru-106 < Tc-99<1000 ( as for reference, 74 Bq/g, Japan domestic legal index). 7
9 Sptn. of RMFP Deposition yield (%) Pd Te Se Rh Ru H+ concentration (M) 20 Mo Re Zr time (min) Fig. Catalytic Electrolytic Extraction of RMFP from Simulated HLLW Galvanostatic Electrolysis ; 500mA/cm 2 (Cathode), Room temp. Cathode; Pt-Ti, 20cm 2, S/V: 1/15cm -1, Pd 2+ Addition; Continuously (2.53gPd 2+ /hr), Pd added /Ru=3.6, Pd added /Rh=16.0, Pd added /Re=
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11 Sptn. of RMFP-3 Effect of CEE (II) ; Tc 140 Electro-deposition of Tc and Ru, x10-6 g/l TcO H ad + H + TcO 2 2H 2 O H ad Effect( +) Pd ad Effect (++) E, V HNO 3 Effect ( ) -0.3 E, V (. NHE ) g/l Tc, ph=4 (1st run) g/l Tc, 0.5 M HNO 3 (2nd run) g/l Tc, 2.0 M HNO 3, 0,5 g/l Pd (3rd run) -0.25g/lRu, 2.5MHNO mtc, 10-6 g Fig. Acceleration of Electro-deposition of TcO 4- by Addition of Pd 2+ Data obtained by KRI through JNC-KRI Collaboration
12 Sptn. of RMFP-4 Deposition of or Re with Pd Deposition of Ru with Pd Interaction between TcO 4- or ReO 4- and Pd 2+ in the bulk solution Deposition of ReO 3 and Pd on the cathode No change of the deposition potential for Re from the mono ionic solution of Re No interaction between RuNO 3+ and Pd 2+ in the bulk solution Deposition of Ru-Pd alloy on the cathode Decrease of the deposition potential for Ru comparing to that in the mono ionic solution of Ru Mediator Pd 2+ - TcO 4 Interaction No interaction - O -O - ReO 4 RuNO 3+ Island state Promoter -NO Pd 2+ Struc tural Param eters from EXAFS Curve Fitting r (Å) coordinati on no. Solid solution C alc ulat ion wi th m etall ic bondin g radi us (Å) Pd - Pd Pd - R u Ru - Pd 10 R u - R u ReO 3 ReO 3 TcO TcO Ru Pd Pd Ru Pd Pd Ru Pd Pd Pd Pd Pd Pd Pd Pd Pd Ru Pd Pd Ru Pd Pd Pt (cathode) Pt (cathode) Fig. Model of Catalytic Electrolytic Extraction 11
13 Utilization -1 Ag/AgCl 40mm 50cc Ag/AgCl 40mm 50cc Ag/AgCl 40mm 50cc 40mm 50cc Ag/AgCl 40mm 50cc Ag/AgCl 40mm 50cc Ag/AgCl 40mm 50cc 40mm 50cc Fig. Experimental Cell 12
14 Utilization -2 Table Reduction Ratios by Catalytic Electrolytic Extraction Syste Reduction ratio / % Composion on Pd Ru Rh Re Tc electrode Surface Pd > Ru Rh - - > Re Tc Pd-Ru Pd Ru Pd-Rh Pd Rh Pd-Re Pd Re Ru-Rh Ru Rh Ru-Re Ru Re Rh-Re Rh Re Pd-Ru-Rh-Re(1:1:1:1) Pd Ru Rh Re Pd-Ru-Rh-Re(3.5:4:1:1) * Pd Ru Rh Re Pd-Ru-Rh-Re(3.5:4:1:1) * Pd Ru Rh Re *1 Pd block addition *2 Pd 5 divided additon 13
15 Utilization -3 Pd 20 µm IMG1 20 µm Pd L Rh Ru 20 µm Rh L 20 µm Ru L Average diameter of individual particle ca. 1000nm Fig. EDS(EPMA) of the deposits on the Pt Electrode from Nitric Acid Solution ; Soln. Composition : Pd-Ru-Rh-Re(3.5:4:1:1) Divided Addition of Pd µm Re Re M
16 Utilization -4 1M NaOH 1M NaOH The Initial Hydrogen Evolution Potentials Ic=0 Fig. The Cathodic Polarization Curves of Pd, Ru, Rh, Re and Tc deposit Pt Electrodes and Pt Electrode (left), and Pd-Ru-Rh-Re deposit Pt Electrode* (right) *Soln. Composition : 3.5:4:1:1, Pd 2+ Divided Addition 15
17 Utilization Electrolytic H 2 Production (RMFP-P ) Active! Rh-Re Ru Ru-Rh quaternary*2 quaternary*3 Cathode Current, I (ma) at φe=1.25v 100 Less Active Re Rh Pd Ru-Re Pt Pd-Ru Pd-Re Pd-Rh Tc quaternary* φ Hinit. ( V vs. Ag/AgCl ) Fig. Relation between Cathodic Current Corresponds to Hydrogen Evolution at -1.25V and Initial Hydrogen Evolution Potential (f Hinit. ) on each Deposit Electrode in 1M NaOH. Deposits from the quaternary ionic solution; *1, Pd:Ru:Rh: Re=1:1:1:1, *2, Pd:Ru:Rh:Re=3.5:4:1:1(Pd 2+ bloc addition), *3, Pd:Ru:Rh:Re= 3.5:4:1:1(Pd 2+ divided addition) 16
18 Utilization -6 Electrolytic H 2 Production (RMFP-Ti) Relative Energy Consumption ( ) ( for Ni electrode) Initial Hydrogen Evolution V vs. Ag/AgCl Potential ( V vs. Ag/AgCl) Fig. Energy Consumption for Electrolysis of 1M NaOH, Ni in the case of RMFP deposit Ti Electrodes 17
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20 Direction -1 SF*- Dissolver Solution (HNO 3 ) Evaporation / Solidification Split Dosimetry Joyo Mox SF (143.8 GWd/t, 2.23x10 27 (n/cm 2 )(E 0.1MeV)) 1.27g/30ml Re-Dissolution (dilute HCl) Diluted HCl Elute Gelated Tertiary Pyridine Resin Alkali-Rinsing NaOH Pre- Separation of RMFP by IX Step I-A RMFP-free Dissolver solution PtG(Ru106,etc) & Tc99-Product Re-Dissolution conc.hcl) Evaporation / Solidification Catalytic Electrolytic Extraction of RMFP Step I-B Utilization Concentrated HCl Elute Slica-supported Tertiary Pyridine Resin Diluted HCl Elute III Fig. Total Separation Flow Diagram to Recover RMFP, Pu+U+Np,Cm and Am Products by IX with CEE Method MA Separation by IX Step II HNO 3 +CH 3 OH Elute Slica-supported Tertiary Pyridine Resin Diluted HNO 3 Elute Ln FP(Cs137, etc) Waste MA U Pu Np-Product Re-Dissolution HNO 3 ) Addition of CH 3 OH HNO 3 :Me=2:3 Am / Cm Separation by IX Step III Evaporation / Solidification Cm-Product Am-Product Total Actinides Recycling 19
21 Direction -2 (Bq) (%) Am E Eu E Ce E Sb E Ru E Cs E H 2 O Rinsing 1M NaOH Rinsing SF Dissolver Solution 0.5M HCl Pre-Filtration Gelated Tertiary Pyridine Resin Joyo Mox SF (143.8 GWd/t, 2.23x10 27 (n/cm 2 )(E 0.1MeV)) 1.27g/30ml Water-rinsed Resin Am E Eu E Ce Sb E Ru Cs E Am E Eu E Ce E Sb E Ru E Cs E Alkaline soln.- rinsed Resin) Am E Eu Ce Sb E Ru Cs Ru106- free Feed D.S. Am E Eu E Ce E Sb E Ru Cs E Am Eu Ce Sb E Ru Cs (FP,Pu fractions, excluding fraction) 20
22 Direction -3 U separation from sea water(?) LWR SF TRU U,(Pu) FBR An- Separation SF LLFP Transmutation 93 Zr 99 Tc 129 I 135 Cs 100 Ru 130 Xe Fission-Energy Cycle Fission-Product Cycle An RMFP- Separation Catalytic Electrolytic Extraction Cs,Sr- Separation FP FP- Advanced separation (isotope sptn.) Ru,Rh,Pd,Tc, Ag, Se,Te,Mo,Zr,Xe,etc (Utilizing Chemistry) 137 Cs, 90 Sr,etc(Utilizing Radiochemistry) Short-Lived FP [Extension to Non- Nuclear Industry] Fig. New Back-End Concept ; Fission-Energy Cycle and Fission-Product Cycle 2
23 Direction -4 Natural Rare Metals in the Earth Ru, Rh, Pd, Ag, Te, Se Spent Fuel (Dissolver solution, HLLW) TcO4 -, RuNO 3+, Rh 3+, Pd 2+, Ag +, Te 4+, Se 4+ Mining & Refining Electrolysis H 2 Separation by Catalytic Electrolytic Extraction Principles of Salt-Free Concept Noble Use at Human Ecosystem FC / H 2 Energy Systems Catalystfor Fuel Cell Catalyst for Hydrogen- Generation & Purification Catalyst for Solar Energy Hydrogen Generation Ru*, Rh*, Te *With cooling > several decades Industrial Utilization Chemical Industry Primary Electricity Tc, Pd, Se With light shielding Nuclear Medicine LLFP Tc-99, Pd-107*,Se- 79* *With isotope separation Transmutation FBR System Rare Metal Fission-Products Fig. Symbiotic Energy System by Hydrogen and Nuclear, Bridging by RMFP 22
24 Separation and Fabrication Conclusions Abundance of RMFP (Ru, Rh, Pd, Tc, Se, Te) in Spent Fuel Applicable of Catalytic Electrolytic Extraction (CEE) Method Utilization RMFP as Catalysts of H 2 Production and Fuel Cell Excellent Ability of Quaternary, Pd-Ru-Rh-Re deposit Pt or Ti electrodes for Electrolysis of either Alkaline or Sea Water Expectation of 99 Tc and Re in this direction of Utilization Strategic View Symbiotic Energy System by hydrogen and Nuclear, bridging by RMFP New Distribution of Precious Rare Metal Natural RM Noble Use, RMFP Industrial Use New Back-End Fuel Cycle Fission-Energy cycle and Fission-Product cycle 23
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26 RMFP in SNF-2 Concentration(g/l) Analysis:LWR-HLLW Simulated HLLW H+ Li B Na Al Si Ca Cr Fe Ni ZnSe Sr Y Zr MoTc RuRhPd Te CsBa La Ce Pr Nd S Eu U Pu RMFP Element Fig. Elemental Composition of High Level Liquid Waste (HLLW) (H+ : mol/l) 8
27 Utilization -5 V vs. Ag/AgCl Initial Hydrogen Evolution Potential *1 Pd-Ru-Rh-Re= *2 Pd-Ru-Rh-Re= /(Ru+Rh+Re)=1.6 Bloc Addition of Pd2+ *3 Pd-Ru-Rh-Re= /(Ru+Rh+Re)=1.6 Continuous Addition of Pd2+ Fig. The Initial Hydrogen Evolution Potentials on Various RMFP-deposited Pt Electrodes 19
28 Utilization in 1M NaOH 99 Tc-Pt in Artificial Sea Water Fig. Cathodic Currents for Hydrogen Evolution of RMFP deposit Pt Electrodes at -1.25V ( vs.ag/agcl)) in 1M NaOH and in Artificial Sea Water 20
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