EP3065140A1 - Verfahren zur auflösung eines metalls, und umsetzung zur einbindung dieses metalls in ein geopolymer - Google Patents
Verfahren zur auflösung eines metalls, und umsetzung zur einbindung dieses metalls in ein geopolymer Download PDFInfo
- Publication number
- EP3065140A1 EP3065140A1 EP16158296.0A EP16158296A EP3065140A1 EP 3065140 A1 EP3065140 A1 EP 3065140A1 EP 16158296 A EP16158296 A EP 16158296A EP 3065140 A1 EP3065140 A1 EP 3065140A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- medium
- hydroxide
- zero
- process according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 95
- 239000002184 metal Substances 0.000 title claims abstract description 95
- 229920000876 geopolymer Polymers 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 68
- 238000004806 packaging method and process Methods 0.000 title abstract description 6
- 230000003647 oxidation Effects 0.000 claims abstract description 54
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 44
- 150000003839 salts Chemical class 0.000 claims abstract description 44
- 230000001590 oxidative effect Effects 0.000 claims abstract description 17
- 229910000000 metal hydroxide Inorganic materials 0.000 claims abstract description 13
- 150000004692 metal hydroxides Chemical class 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 63
- 239000000203 mixture Substances 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- 150000001768 cations Chemical class 0.000 claims description 22
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 21
- 239000012670 alkaline solution Substances 0.000 claims description 20
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims description 8
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 7
- 230000003750 conditioning effect Effects 0.000 claims description 7
- 238000012858 packaging process Methods 0.000 claims description 6
- 229910052770 Uranium Inorganic materials 0.000 claims description 5
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 claims description 5
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000008119 colloidal silica Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 claims description 2
- 229910052695 Americium Inorganic materials 0.000 claims description 2
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 229910052685 Curium Inorganic materials 0.000 claims description 2
- 229910052781 Neptunium Inorganic materials 0.000 claims description 2
- 229910052778 Plutonium Inorganic materials 0.000 claims description 2
- 229910052776 Thorium Inorganic materials 0.000 claims description 2
- 229910052767 actinium Inorganic materials 0.000 claims description 2
- QQINRWTZWGJFDB-UHFFFAOYSA-N actinium atom Chemical compound [Ac] QQINRWTZWGJFDB-UHFFFAOYSA-N 0.000 claims description 2
- 229910001583 allophane Inorganic materials 0.000 claims description 2
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims description 2
- LXQXZNRPTYVCNG-UHFFFAOYSA-N americium atom Chemical compound [Am] LXQXZNRPTYVCNG-UHFFFAOYSA-N 0.000 claims description 2
- 229910001588 amesite Inorganic materials 0.000 claims description 2
- 229910052849 andalusite Inorganic materials 0.000 claims description 2
- 239000000440 bentonite Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- 239000006227 byproduct Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims description 2
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- NIWWFAAXEMMFMS-UHFFFAOYSA-N curium atom Chemical compound [Cm] NIWWFAAXEMMFMS-UHFFFAOYSA-N 0.000 claims description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000010433 feldspar Substances 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 229910052900 illite Inorganic materials 0.000 claims description 2
- 229910052622 kaolinite Inorganic materials 0.000 claims description 2
- 229910052850 kyanite Inorganic materials 0.000 claims description 2
- 239000010443 kyanite Substances 0.000 claims description 2
- 238000005065 mining Methods 0.000 claims description 2
- LFNLGNPSGWYGGD-UHFFFAOYSA-N neptunium atom Chemical compound [Np] LFNLGNPSGWYGGD-UHFFFAOYSA-N 0.000 claims description 2
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 claims description 2
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000008262 pumice Substances 0.000 claims description 2
- 229910052903 pyrophyllite Inorganic materials 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 229910052678 stilbite Inorganic materials 0.000 claims description 2
- CYPPCCJJKNISFK-UHFFFAOYSA-J kaolinite Chemical compound [OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[O-][Si](=O)O[Si]([O-])=O CYPPCCJJKNISFK-UHFFFAOYSA-J 0.000 claims 1
- 230000003213 activating effect Effects 0.000 abstract description 4
- 239000011777 magnesium Substances 0.000 description 46
- 239000002609 medium Substances 0.000 description 46
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 38
- 238000004090 dissolution Methods 0.000 description 34
- 239000000243 solution Substances 0.000 description 26
- 229940091250 magnesium supplement Drugs 0.000 description 25
- 229910052749 magnesium Inorganic materials 0.000 description 22
- 239000007789 gas Substances 0.000 description 14
- 239000004576 sand Substances 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 9
- 230000004913 activation Effects 0.000 description 8
- QRNPTSGPQSOPQK-UHFFFAOYSA-N magnesium zirconium Chemical compound [Mg].[Zr] QRNPTSGPQSOPQK-UHFFFAOYSA-N 0.000 description 8
- 150000002739 metals Chemical class 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 230000006641 stabilisation Effects 0.000 description 8
- 238000011105 stabilization Methods 0.000 description 8
- 150000004679 hydroxides Chemical class 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000374 eutectic mixture Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 229910000861 Mg alloy Inorganic materials 0.000 description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 4
- -1 metal hydroxide salt Chemical class 0.000 description 4
- 238000009666 routine test Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- 229960003390 magnesium sulfate Drugs 0.000 description 3
- 235000019341 magnesium sulphate Nutrition 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
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- 230000002285 radioactive effect Effects 0.000 description 2
- 239000012429 reaction media Substances 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 229910021642 ultra pure water Inorganic materials 0.000 description 2
- 239000012498 ultrapure water Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910019479 Mg(SO4) Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- RYXPMWYHEBGTRV-UHFFFAOYSA-N Omeprazole sodium Chemical compound [Na+].N=1C2=CC(OC)=CC=C2[N-]C=1S(=O)CC1=NC=C(C)C(OC)=C1C RYXPMWYHEBGTRV-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- 229910002800 Si–O–Al Inorganic materials 0.000 description 1
- 229910052768 actinide Inorganic materials 0.000 description 1
- 150000001255 actinides Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 238000013213 extrapolation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- YWCLWGMTGGFSDF-UHFFFAOYSA-N lead;dihydrate Chemical compound O.O.[Pb] YWCLWGMTGGFSDF-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- QWDJLDTYWNBUKE-UHFFFAOYSA-L magnesium bicarbonate Chemical compound [Mg+2].OC([O-])=O.OC([O-])=O QWDJLDTYWNBUKE-UHFFFAOYSA-L 0.000 description 1
- 239000002370 magnesium bicarbonate Substances 0.000 description 1
- 229910000022 magnesium bicarbonate Inorganic materials 0.000 description 1
- 235000014824 magnesium bicarbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- FXBYOMANNHFNQV-UHFFFAOYSA-L magnesium;hydrogen sulfate Chemical compound [Mg+2].OS([O-])(=O)=O.OS([O-])(=O)=O FXBYOMANNHFNQV-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 125000004430 oxygen atom Chemical group O* 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 229910052704 radon Inorganic materials 0.000 description 1
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
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- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000003381 solubilizing effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/30—Processing
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/30—Processing
- G21F9/301—Processing by fixation in stable solid media
- G21F9/302—Processing by fixation in stable solid media in an inorganic matrix
- G21F9/304—Cement or cement-like matrix
Definitions
- the present invention belongs to the technical field of the disposal and packaging of waste such as metal nuclear waste containing in particular a metal with a degree of oxidation of zero such as magnesium metal.
- the present invention provides a method of stabilizing a metal at an optionally radioactive zero oxidation state such as optionally radioactive metal magnesium by an oxidation step in a molten salt such as a hydroxide medium.
- the mixture thus obtained can be subsequently used for conditioning in a geopolymeric mineral matrix.
- UNGG nuclear facilities for "Natural Uranium - Graphite - Gas" are based on cooled and natural graphite modulated natural uranium reactors.
- the fissile material used is a natural uranium in metallic form
- the cladding material is made of magnesium metal, in particular in the form of an alloy.
- the carbonic dissolution process is, however, a slow process that generates effluents that are not rich in magnesium and therefore a large volume of effluents.
- the dissolution of magnesium hydroxide and magnesium carbonate is very limited.
- the inventors have set themselves the goal of proposing a method for the stabilization of magnesium metal which avoids or even prevents the disadvantages of the processes of the prior art. More particularly, the inventors have set themselves the goal of proposing a process for the stabilization of magnesium metal generating little or no liquid effluent, presenting less risk for equipment and personnel in charge of this stabilization and likely to be put in place. implemented in compact installations and with fast kinetics.
- the present invention solves the technical problems of magnesium metal stabilization processes and achieve the goals set by the inventors.
- the present invention is remarkable because, from the results obtained for the stabilization of magnesium metal, it is generalizable to many other metals.
- the medium used during the pyrochemical process is an oxidizing medium for treating many metals more reducing than said medium.
- this conditioning can be performed on many metals.
- the present invention relates to a method for preparing a medium comprising at least one metal hydroxide comprising putting a metal at a zero oxidation state in contact with a medium comprising at least one molten salt of the hydroxide type, in the presence a more oxidizing element than said metal at an oxidation state of zero, whereby a medium comprising at least one metal hydroxide is obtained.
- This process is also defined herein as a pyrochemical process. Similarly, this process can be defined as a method of dissolving or solubilizing a metal at an oxidation state of zero.
- this metal with an oxidation state of zero is usable in the context of the process according to the present invention.
- this metal with a degree of oxidation of zero typically belongs to the elements that it is desired to stabilize and condition, especially in the context of the disposal and treatment of metallic nuclear waste.
- the metal at an oxidation state of zero is selected from the group consisting of magnesium metal, aluminum metal, a metal actinide, one of their alloys or a mixture thereof.
- the metal with a zero oxidation state is selected from the group consisting of magnesium metal, aluminum metal, uranium metal, neptunium metal, actinium metal, thorium metal, plutonium metal , americium metal, curium metal, one of their alloys or a mixture thereof.
- alloy is meant both an alloy of two different metals mentioned in any of the above lists than an alloy of a metal cited in any of the above lists with a metal not present. in these lists.
- mixing is meant a mixture of at least two different metals mentioned in any of the above lists.
- the metal at an oxidation state of zero is magnesium metal either in the form of pure metal magnesium or in the form of a magnesium metal alloy.
- a magnesium metal alloy is more particularly selected from the group consisting of magnesium / aluminum, magnesium / zirconium and magnesium / manganese. In these alloys, the amount of magnesium is greater than 80%, 90% and 95% expressed by weight relative to the total mass of the alloy.
- magnesium metal and “magnesium metal” are equivalent and can be used interchangeably. The same is true for all the other metals mentioned in the lists above.
- the metal with an oxidation degree of zero and in particular magnesium metal are advantageously contained in a technological waste coming from a dismantling workshop of a UNGG type installation or from a dismantling, operating and maintenance or maintenance of a MAGNOX type installation.
- the metal at a zero oxidation state is in solid form of the powders, fines, deposit, fragment or piece type.
- the latter can have a very variable size and shape.
- the maximum size that a fragment or piece of metal can present at an oxidation state of zero is between 0.1 cm and 150 cm, in particular between 1 cm and 100 cm and, in particular, between 2 cm and 50 cm. cm.
- intermediate comprising at least one molten salt of the hydroxide type is meant an anhydrous liquid resulting from the melting of at least one salt of the hydroxide type.
- the medium comprising at least one molten salt of the hydroxide type used in the process according to the present invention consists only of a molten salt of the hydroxide type such as, for example, potassium hydroxide (KOH), sodium hydroxide (NaOH) or lead hydroxide (Pb (OH) 2 ).
- KOH potassium hydroxide
- NaOH sodium hydroxide
- Pb (OH) 2 lead hydroxide
- the medium comprising at least one molten salt of the hydroxide type used in the process according to the present invention may be an eutectic mixture.
- eutectic mixing is meant a mixture of at least two products in defined proportions having physico-chemical characteristics essentially identical to those of a single product or “pure body”.
- Such a eutectic mixture may be binary and therefore consist of a mixture of two products but may also contain more than two products. Note that It may be advantageous to use such a eutectic mixture to obtain a melting temperature below the melting temperature of at least one of the products present in the mixture and used alone.
- a eutectic mixture that may be used in the context of the present invention may comprise at least two different molten salts of hydroxide type.
- such a eutectic mixture may be a mixture of potassium hydroxide (KOH) and magnesium hydroxide (Mg (OH) 2 ), in particular a mixture of KOH + Mg (OH) 2 with the KOH present in a weight percentage of 65 to 95%, advantageously 70 to 90% and the Mg (OH) 2 present in a weight percentage of 5 to 35%, advantageously 10 to 30%, the mass percentages being expressed relative to to the total mass of the mixture.
- KOH potassium hydroxide
- Mg (OH) 2 magnesium hydroxide
- a more particular example of hydroxide mixtures that can be used in the context of the present invention is a mixture of KOH at 80% by weight and Mg (OH) 2 at 20% by weight, the mass percentages being expressed relative to the total mass of the product. mixed.
- an eutectic mixture that may be used in the context of the present invention may comprise at least one molten salt of the hydroxide type and at least one other molten salt different from a hydroxide and in particular such as a salt.
- melted chloride, fluoride, nitrate or carbonate melted chloride, fluoride, nitrate or carbonate.
- the mixture obtained should remain compatible with a subsequent use to prepare an immobilization matrix.
- the contacting of the metal at an oxidation state of zero with the medium comprising at least one molten salt of the hydroxide type is in the presence of a more oxidizing element than said metal at an oxidation state of zero.
- the metal with a degree of oxidation of zero is oxidized and converted into a metal having a degree of oxidation greater than zero and typically a degree of oxidation of 1, 2 , 3 or 4.
- the metal having a degree of oxidation greater than zero is therefore in ionic form in the medium comprising at least one molten hydroxide salt and is capable of forming a metal hydroxide salt with the hydroxide ions present in said medium.
- Any element more oxidizing than said metal at an oxidation state of zero is usable within the scope of the present invention.
- Those skilled in the art can find from such reference works such an element, once the metal has an oxidation degree of zero known. It is also easy for a person skilled in the art to determine and identify by routine tests an element which is more oxidizing than a metal with an oxidation state of zero, once this latter is known.
- the more oxidizing said metal element to a degree of zero oxidation is water.
- This water may be in the form of a moist, neutral gas.
- moist neutral gas is meant a neutral or inert gas, i.e. a gas not reacting with the various compounds with which it is in contact, charged with water vapor.
- the neutral gas may be a rare gas, i.e. a gas consisting of a member selected from helium, neon, argon, krypton, xenon, radon and a mixture thereof.
- the neutral gas is a rare gas, the latter is advantageously argon.
- the rare gases are particularly advantageous in that they do not dissolve in the medium comprising at least one molten salt of the hydroxide type, and therefore do not bring new elements into this medium, which does not increase the volume of this medium. It is understood that for the purposes of the invention, this rare gas is charged with water vapor.
- the neutral gas charged with water vapor may also be nitrogen charged with water vapor.
- the water vapor content contained in the neutral gas and the flow rate with which it is brought into contact with the medium comprising at least one molten salt of the hydroxide type so that inducing the oxidation of the metal to an oxidation state of zero and, from this oxidized metal, the formation of metal hydroxide.
- the water used as a more oxidizing element than the metal at an oxidation state of zero may be added to the medium containing at least one molten salt of the hydroxide type.
- This variant can be implemented using at least one of the salts used to prepare the medium comprising at least one molten salt of hydroxide type, under form of a hydrated salt and / or adding water to the medium comprising at least one molten salt hydroxide type, once the latter prepared.
- This water can also be tap water, deionized water, distilled water or ultrapure water (18.2 M ⁇ ).
- the amount of salt (s) hydrated (s) and / or the amount of water to be used in the medium comprising at least one molten salt of hydroxide type so as to induce the oxidation of the metal to an oxidation state of zero and, from this oxidized metal, the formation of metal hydroxide.
- the element that is more oxidizing than said metal at an oxidation state of zero is a metal cation that is more oxidizing than the metal at an oxidation degree of zero, said metal cation being present in the medium. comprising at least one molten salt of hydroxide type.
- more oxidant means a metal element or cation belonging to a redox couple more oxidizing than the redox couple formed by the metal at an oxidation state of zero and its corresponding cation.
- the metal cation when the metal at an oxidation state of zero is magnesium metal, the metal cation may be Zn 2+ , Fe 2+ , Pb 2+ or Cu 2+ .
- This metal cation may be present in the medium in the form of a molten salt of hydroxide, chloride, fluoride, nitrate or carbonate.
- the pyrochemical process is carried out in the context of the present invention at atmospheric pressure (i.e. at 1013 hPa) and at a moderate temperature.
- “Moderate temperature” means a temperature between 100 ° C and 400 ° C, and in particular between 150 ° C and 350 ° C.
- the temperature is chosen so that the salt (s) present in the reaction medium are in the form of salt (s) melt (s). So the man from profession will determine the most suitable reaction temperature depending on the salt (s) present (s) in this medium.
- the pyrochemical process is carried out for a time sufficient to obtain complete dissolution of the metal at a zero oxidation state in the medium comprising at least one molten salt of hydroxide type.
- This duration is therefore a function of the size of the powders, the fines, the deposit, the fragment or the piece of the metal at an oxidation degree of zero. It can be determined macroscopically by following the disappearance of said powders, fines, deposit, fragment is piece in said medium. Alternatively, this time can be extrapolated by routine tests as presented in Example 1 below and used to determine the corrosion rate of said metal at an oxidation state of zero in said reaction medium.
- the medium obtained as a result of the pyrochemical process according to the invention may comprise, in addition to a salt of the metal hydroxide type (ie hydroxide of the cation corresponding to the metal at an oxidation degree of zero), one or more other element (s).
- (S) such (s) as a molten salt of the hydroxide type initially present in said medium and optionally a molten salt of the chloride, fluoride, nitrate or carbonate type.
- the process for conditioning a metal having a degree of oxidation of zero involves the use of a pyrochemical process as defined above to prepare a medium comprising at least one salt of the metal hydroxide type, ie the hydroxide of the metal. in oxidized form and use of this medium to prepare an activation solution as defined in the field of geopolymers.
- geopolymer or “geopolymer matrix” is meant in the context of the present invention a solid and porous material in the dry state, obtained following the hardening of a mixture containing finely ground materials (ie the alumino-silicate source ) and a saline solution (ie the activating solution), said plastic mixture being able to set and harden over time.
- This mixture may also be referred to as "geopolymeric mixture” or “geopolymeric composition”.
- the hardening of the geopolymer is the result of the dissolution / polycondensation of the finely ground materials of the geopolymeric mixture in a saline solution such as a high pH salt solution (i.e. the activating solution).
- a geopolymer or geopolymer matrix is an amorphous aluminosilicate inorganic polymer.
- Said polymer is obtained from a reactive material essentially containing silica and aluminum (ie the aluminosilicate source), activated by a strongly alkaline solution, the solid / solution weight ratio in the formulation being low.
- the structure of a geopolymer is composed of an Si-O-Al lattice formed of silicate (SiO 4 ) and aluminate (AlO 4 ) tetrahedra bound at their vertices by oxygen atom sharing.
- charge compensation cation also called compensation cation (s) which make it possible to compensate for the negative charge of the AlO 4 - complex.
- Said cation (s) of compensation is (are) advantageously chosen from the group consisting of alkali metals such as lithium (Li), sodium (Na), potassium (K), rubidium (Rb ) and cesium (Cs), alkaline earth metals such as magnesium (Mg), calcium (Ca), strontium (Sr) and barium (Ba) and mixtures thereof.
- step (a) corresponds to a pyrochemical process as defined above.
- step (a) of the packaging process corresponds to step (a) of the packaging process.
- Step (b) consists in reducing the medium comprising at least one salt of the metal hydroxide type to ambient temperature (i.e. at a temperature of between 23 ° C. ⁇ 5 ° C.).
- the temperature of the medium following step (a) is advantageously between 100 ° C. and 400 ° C., and in particular between 150 ° C. and 350 ° C. This cooling leads to solidification, and the cooled medium obtained after step (b) is a solid medium.
- an alkaline solution and in particular a strongly alkaline solution ie a high-pH salt solution is prepared from the cooled solid medium obtained following the step ( b) the method, by putting said medium in contact with water.
- water is meant, in the context of the present invention, both tap water, deionized water, distilled water and ultra-pure water (18.2 M ⁇ ), all these waters possibly being basic.
- activating solution high pH saline solution
- high alkaline solution high alkaline solution
- strongly alkaline or “high pH” means a solution whose pH is greater than 9, especially greater than 10, in particular greater than 11 and more particularly greater than 12.
- the activation solution has a concentration of OH - greater than 0.01 M, in particular greater than 0.1 million, particularly greater than 1M and, in particular, between 5 and 20 M. the skilled artisan will determine by routine work, the appropriate amount of water to be added to the cooled solid medium to obtain an alkaline solution of the activation solution type.
- the activation solution is defined as a strongly alkaline aqueous solution which may optionally contain silicate components in particular selected from the group consisting of silica, colloidal silica and vitreous silica.
- silicate component (s) in particular chosen from the group consisting of silica, colloidal silica and vitreous silica in step (c) of the process according to the invention.
- This addition can be carried out using water containing one or more of these silicate components or by adding one or more of these silicate components to the solution obtained following the dissolution of the solid medium cooled in water.
- the latter (s) is (are) present in an amount of between 100 mM and 10 mM. M, especially between 500 mM and 8 M and, in particular, between 1 and 6 M in the alkaline solution.
- Step (c) of the packaging process according to the invention can be carried out with stirring using a kneader, a stirrer, a magnetic bar, an ultrasonic bath or a homogenizer, in order to facilitate the dissolution of the solid cooled medium. and any mixing with the silicate components.
- the dissolution / mixing / kneading process during the sub-step (c) of the process according to the invention is carried out at a relatively high speed.
- relatively high speed means, in the context of the present invention, a speed greater than 250 rpm, especially greater than or equal to 350 rpm.
- Step (c) of the process according to the invention is carried out at a temperature of between 10 ° C. and 40 ° C., advantageously between 15 ° C. and 30 ° C. and, more particularly, at room temperature for a duration greater than 6 ° C. h, especially greater than 10 h, in particular between 10 h and 48 h and, more particularly, between 12 h and 36 h.
- Step (d) of the process according to the invention consists in bringing into contact the alkaline solution prepared in step (c) and an aluminosilicate source.
- reactive material containing essentially silica and aluminum and “aluminosilicate source” are, in the present invention, similar and usable interchangeably.
- the reactive material containing essentially silica and aluminum that can be used to prepare the geopolymer matrix used in the context of the invention is advantageously a solid source containing amorphous aluminosilicates.
- amorphous alumino-silicates are chosen in particular from natural alumino-silicate minerals such as illite, stilbite, kaolinite, pyrophyllite, andalusite, bentonite, kyanite, milanite, grovenite, amesite, cordierite, feldspar, allophane, etc .; calcined natural aluminosilicate minerals such as metakaolin; synthetic glasses based on pure aluminosilicates; aluminous cement; pumice; calcined by-products or industrial mining residues such as fly ash and blast furnace slags respectively obtained from the burning of coal and during the processing of cast iron ore in a blast furnace; and mixtures thereof.
- the alumino-silicate source can be poured in one or more times on the alkaline solution.
- the alumino-silicate source may be sprinkled onto the alkaline solution.
- step (d) of the process according to the invention is carried out in a kneader in which the alkaline solution has been introduced beforehand.
- a kneader known to those skilled in the art can be used in the context of the present invention.
- Step (d) of the process according to the invention therefore comprises a mixing or kneading of the alkaline solution with the aluminosilicate source.
- the mixing / kneading during step (d) of the process according to the invention is carried out at a relatively slow speed.
- relatively slow speed is meant, in the context of the present invention, a rotational speed of the rotor of the mixer less than or equal to 250 rpm, especially greater than or equal to 50 rpm and, in particular, included between 100 and 250 rpm.
- the stirring speed is 200 rpm.
- Step (d) of the process according to the invention is carried out at a temperature of between 10 ° C. and 40 ° C., advantageously between 15 ° C. and 30 ° C. and, more particularly, at room temperature for a duration greater than 2 ° C. min, especially between 4 min and 1 h and in particular between 5 min and 30 min.
- the mass ratio alkaline solution / MK with alkaline solution representing the mass of solid cooled product obtained following step (b) + the water added in step (c) + optionally the silicated component (s) (expressed in g) and MK representing the alumino-silicate source mass (expressed in g) used is advantageously between 0.6 and 2 and in particular between 1 and 1, 7.
- sand, granulate and / or fines may optionally be added to the alkaline solution during said step (d) of the process according to the invention.
- granulate is meant a granular material, natural, artificial or recycled, the average grain size is advantageously between 10 and 125 mm.
- the fines also called “fillers” or “addition fines” is a dry product, finely divided, resulting from the size, sawing or work of natural rocks, aggregates as previously defined and ornamental stones.
- the fines have an average grain size in particular of between 5 and 200 ⁇ m.
- the sand, the granulate and / or the fines are (are) added (e) to better regulate the rise in temperature during step (d) of the process but also to optimize the physical and mechanical properties of the geopolymer obtained.
- the sand possibly added during step (d) may be calcareous sand or siliceous sand.
- it is a siliceous sand that achieves the best results in terms of optimizing the physical and mechanical properties of the geopolymer obtained.
- the term "siliceous sand” is intended to mean sand that is more than 90%, in particular more than 95%, in particular greater than 98%, and more particularly more than 99%. of silica (SiO 2 ).
- the siliceous sand used in the present invention advantageously has a mean grain size in particular of less than 10 mm, in particular less than 7 mm and in particular less than 4 mm.
- a siliceous sand having a mean grain size of between 0.2 and 2 mm can be used.
- the mass ratio between sand and alumino-silicate source is between 2/1 and 1/2, in particular between 1.5 / 1 and 1 / 1.5 and, in particular, between 1.2 / 1 and 1 / 1.2.
- Step (e) of the process according to the invention consists in subjecting the mixture obtained in step (d) to conditions allowing the geopolymeric mixture to harden.
- the conditions for curing during step (e) advantageously comprise a curing step optionally followed by a drying step.
- the curing step can be done in the open air, under water, in various hermetic molds, by humidifying the atmosphere surrounding the geopolymeric mixture or by applying an impervious coating on said mixture.
- This curing step may be carried out under a temperature of between 10 and 80 ° C., in particular between 20 and 60 ° C. and in particular between 30 and 40 ° C. and may last between 1 and 40 days, or even longer. . It is obvious that the duration of the cure depends on the conditions implemented during the latter and the skilled person will be able to determine the most suitable duration, once the conditions defined and possibly by routine tests.
- the curing step may optionally include a drying step, in addition to the curing step.
- This drying can be carried out at a temperature of between 30 and 90 ° C., in particular between 40 and 80 ° C. and in particular between 50 and 70 ° C., and can last between 6 hours and 10 days, in particular between 12 hours and 5 hours. days and, in particular, between 24 and 60 h.
- the latter prior to the hardening of the geopolymeric mixture, the latter can be placed in molds so as to give it a predetermined shape following this hardening.
- the geopolymer obtained following the packaging process according to the present invention contains the metal to be packaged in particular in oxidized form and possibly acting as a compensation cation as previously defined.
- the Figure 1 is a top view of the reactor in which the MgZr fin is immersed in the molten hydroxide during oxidation. Gas bubbles that emanate uniformly from the melt are visible, probably from hydrogen evolution and wet argon bubbling.
- magnesium metal chips After determining the dissolution kinetics of massive MgZr, a dissolution and immobilization test of magnesium metal chips was carried out in the KOH + Mg (OH) 2 hydroxide mixture (80/20% by mass) at 230 ° C. while maintaining a low pH 2 O (acid medium) by bubbling argon saturated with water.
- the magnesium chips have a specific surface area of 0.028 m 2 / g.
- the hydroxide salt block of the Figure 4D was then used to prepare the geopolymer activation solution ( Figure 4E ).
- the composition of the geopolymer paste is shown in Table 1 below: ⁇ u> Table 1: Composition of the geopolymer prepared from the dissolution of magnesium metal and results of the mechanical resistances and dimensional variations at 28 days ⁇ / u> Mass (in g) Rm / V dim (under air) Rm / V dim (under bag) Rm / V dim (under water) water 354 46 MPa 51 MPa 50 M Pa KOH 184 1 -1075 ⁇ m / m -343 ⁇ m / m -775 ⁇ m / m SiO 2 118 metakaolin 435
- the amount of potassium hydroxide 1 comes exclusively from the block of magnesium dissolution salt in KOH + Mg (OH) 2 .
- Magnesium hydroxide has not been taken into account in the calculation of the geopolymer formulation, therefore the final composition of the geopolymer is: 1K 2 O, 1 Al 2 O 3 , 3.6 SiO 2 , 12 H 2 O + excess of Mg (OH) 2
- test pieces ( Figure 4F ) were kept with the three modes of preservation (water, air, bag) for 28 days.
- the results in compression and dimensional variations are reported in Table 1. It appears that the geopolymer pastes have very good mechanical properties at 28 days and are well above the requirements of 8MPa requested by ANDRA for the packaging of homogeneous waste.
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FR1551877A FR3033444B1 (fr) | 2015-03-05 | 2015-03-05 | Procede de dissolution d'un metal et mise en œuvre pour conditionner ledit metal dans un geopolymere. |
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CN115011957A (zh) * | 2022-05-09 | 2022-09-06 | 桂林理工大学 | 利用碱热法在镁合金表面制备氢氧化镁与二氧化硅复合薄膜的方法及得到的镁合金材料 |
Citations (3)
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GB2437864A (en) | 2007-03-20 | 2007-11-07 | Malcolm Brody | Rapid and Selective Dissolution of Magnesium Alloy |
RU2316387C2 (ru) | 2005-04-04 | 2008-02-10 | Федеральное государственное унитарное предприятие "Производственное объединение "Маяк" | Способ растворения твэл, содержащих металлический магний |
GB2508010A (en) * | 2012-11-19 | 2014-05-21 | Bradtec Decon Technologies Ltd | Treatment of Radioactive Material |
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RU2316387C2 (ru) | 2005-04-04 | 2008-02-10 | Федеральное государственное унитарное предприятие "Производственное объединение "Маяк" | Способ растворения твэл, содержащих металлический магний |
GB2437864A (en) | 2007-03-20 | 2007-11-07 | Malcolm Brody | Rapid and Selective Dissolution of Magnesium Alloy |
GB2508010A (en) * | 2012-11-19 | 2014-05-21 | Bradtec Decon Technologies Ltd | Treatment of Radioactive Material |
Non-Patent Citations (2)
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IGOR N SKRYPTUN ET AL: "CORROSION OF MAGNESIUM, ALUMINIUM AND TITANIUM IN ALKALINE-SALT MELTS", 31 December 1981 (1981-12-31), XP055230536, Retrieved from the Internet <URL:http://www.electrochem.org/dl/ma/201/pdfs/1433.pdf> [retrieved on 20151123] * |
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Cited By (1)
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CN115011957A (zh) * | 2022-05-09 | 2022-09-06 | 桂林理工大学 | 利用碱热法在镁合金表面制备氢氧化镁与二氧化硅复合薄膜的方法及得到的镁合金材料 |
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FR3033444A1 (fr) | 2016-09-09 |
EP3065140B1 (de) | 2018-09-26 |
FR3033444B1 (fr) | 2017-04-07 |
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