WO2023018358A1 - Высокочистый оксид магния и способ его производства - Google Patents
Высокочистый оксид магния и способ его производства Download PDFInfo
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- WO2023018358A1 WO2023018358A1 PCT/RU2022/050214 RU2022050214W WO2023018358A1 WO 2023018358 A1 WO2023018358 A1 WO 2023018358A1 RU 2022050214 W RU2022050214 W RU 2022050214W WO 2023018358 A1 WO2023018358 A1 WO 2023018358A1
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- WIPO (PCT)
- Prior art keywords
- magnesium oxide
- mass fraction
- mixtures
- magnesium
- range
- Prior art date
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 132
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title description 33
- 230000008569 process Effects 0.000 title description 10
- 239000012535 impurity Substances 0.000 claims abstract description 58
- 239000002245 particle Substances 0.000 claims abstract description 51
- 239000011148 porous material Substances 0.000 claims abstract description 37
- 239000011164 primary particle Substances 0.000 claims abstract description 36
- 230000000694 effects Effects 0.000 claims abstract description 20
- 229910052753 mercury Inorganic materials 0.000 claims abstract description 14
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims abstract description 11
- 238000004438 BET method Methods 0.000 claims abstract description 8
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 5
- 229910052788 barium Inorganic materials 0.000 claims abstract description 5
- 229910052745 lead Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 5
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 4
- 150000001805 chlorine compounds Chemical class 0.000 claims abstract 2
- 235000012245 magnesium oxide Nutrition 0.000 claims description 127
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 92
- 239000000347 magnesium hydroxide Substances 0.000 claims description 90
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 90
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 89
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 87
- 239000013078 crystal Substances 0.000 claims description 53
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 43
- 239000000725 suspension Substances 0.000 claims description 43
- 239000007864 aqueous solution Substances 0.000 claims description 33
- 239000000203 mixture Chemical class 0.000 claims description 32
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000005216 hydrothermal crystallization Methods 0.000 claims description 17
- 239000003513 alkali Substances 0.000 claims description 13
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 12
- -1 alkaline earth metal salts Chemical class 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 10
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 10
- 238000000746 purification Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 229910052796 boron Inorganic materials 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 7
- 239000003153 chemical reaction reagent Substances 0.000 claims description 7
- 238000002459 porosimetry Methods 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 6
- 230000002431 foraging effect Effects 0.000 claims description 6
- 230000003993 interaction Effects 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 229910001385 heavy metal Inorganic materials 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 235000005979 Citrus limon Nutrition 0.000 claims description 4
- 244000248349 Citrus limon Species 0.000 claims description 4
- 239000007900 aqueous suspension Substances 0.000 claims description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 4
- 239000004327 boric acid Substances 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 3
- 229910000410 antimony oxide Inorganic materials 0.000 claims description 3
- 229910000379 antimony sulfate Inorganic materials 0.000 claims description 3
- MVMLTMBYNXHXFI-UHFFFAOYSA-H antimony(3+);trisulfate Chemical compound [Sb+3].[Sb+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O MVMLTMBYNXHXFI-UHFFFAOYSA-H 0.000 claims description 3
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052794 bromium Inorganic materials 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000001506 calcium phosphate Substances 0.000 claims description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 3
- 235000011010 calcium phosphates Nutrition 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 238000007561 laser diffraction method Methods 0.000 claims description 3
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 claims description 3
- 150000003009 phosphonic acids Chemical class 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 235000003441 saturated fatty acids Nutrition 0.000 claims description 3
- 150000004671 saturated fatty acids Chemical class 0.000 claims description 3
- 125000005624 silicic acid group Chemical class 0.000 claims description 3
- 239000000377 silicon dioxide Chemical class 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 3
- VLCLHFYFMCKBRP-UHFFFAOYSA-N tricalcium;diborate Chemical class [Ca+2].[Ca+2].[Ca+2].[O-]B([O-])[O-].[O-]B([O-])[O-] VLCLHFYFMCKBRP-UHFFFAOYSA-N 0.000 claims description 3
- 150000004670 unsaturated fatty acids Chemical class 0.000 claims description 3
- 235000021122 unsaturated fatty acids Nutrition 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 238000002848 electrochemical method Methods 0.000 claims description 2
- 150000002484 inorganic compounds Chemical class 0.000 claims description 2
- 229910010272 inorganic material Inorganic materials 0.000 claims description 2
- 238000005342 ion exchange Methods 0.000 claims description 2
- 150000002894 organic compounds Chemical class 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 150000003018 phosphorus compounds Chemical class 0.000 claims description 2
- 239000012756 surface treatment agent Substances 0.000 claims description 2
- 229910021331 inorganic silicon compound Inorganic materials 0.000 claims 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims 1
- 238000004364 calculation method Methods 0.000 claims 1
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 229910000077 silane Inorganic materials 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 14
- 239000000126 substance Substances 0.000 abstract description 11
- 235000012254 magnesium hydroxide Nutrition 0.000 description 81
- 229960002337 magnesium chloride Drugs 0.000 description 38
- 239000000243 solution Substances 0.000 description 38
- 235000011121 sodium hydroxide Nutrition 0.000 description 26
- 239000002244 precipitate Substances 0.000 description 17
- 230000015572 biosynthetic process Effects 0.000 description 16
- 239000000843 powder Substances 0.000 description 11
- 230000032683 aging Effects 0.000 description 9
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 239000011163 secondary particle Substances 0.000 description 8
- 150000003841 chloride salts Chemical class 0.000 description 7
- 239000011651 chromium Substances 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 235000013305 food Nutrition 0.000 description 7
- 239000003456 ion exchange resin Substances 0.000 description 7
- 229920003303 ion-exchange polymer Polymers 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 239000002537 cosmetic Substances 0.000 description 6
- 238000010304 firing Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 238000005868 electrolysis reaction Methods 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000002243 precursor Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 235000011116 calcium hydroxide Nutrition 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 229920001429 chelating resin Polymers 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 3
- 239000001095 magnesium carbonate Substances 0.000 description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 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 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- LCKIEQZJEYYRIY-UHFFFAOYSA-N Titanium ion Chemical compound [Ti+4] LCKIEQZJEYYRIY-UHFFFAOYSA-N 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000012776 electronic material Substances 0.000 description 2
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- 238000010335 hydrothermal treatment Methods 0.000 description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 description 2
- 229940091250 magnesium supplement Drugs 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 235000015424 sodium Nutrition 0.000 description 2
- APSBXTVYXVQYAB-UHFFFAOYSA-M sodium docusate Chemical group [Na+].CCCCC(CC)COC(=O)CC(S([O-])(=O)=O)C(=O)OCC(CC)CCCC APSBXTVYXVQYAB-UHFFFAOYSA-M 0.000 description 2
- 238000001694 spray drying Methods 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- DJICMBAHCRMPDT-UHFFFAOYSA-N 1-propan-2-yl-2-tridecylbenzene Chemical compound CCCCCCCCCCCCCC1=CC=CC=C1C(C)C DJICMBAHCRMPDT-UHFFFAOYSA-N 0.000 description 1
- MTEZSDOQASFMDI-UHFFFAOYSA-N 1-trimethoxysilylpropan-1-ol Chemical compound CCC(O)[Si](OC)(OC)OC MTEZSDOQASFMDI-UHFFFAOYSA-N 0.000 description 1
- IEKHISJGRIEHRE-UHFFFAOYSA-N 16-methylheptadecanoic acid;propan-2-ol;titanium Chemical compound [Ti].CC(C)O.CC(C)CCCCCCCCCCCCCCC(O)=O.CC(C)CCCCCCCCCCCCCCC(O)=O.CC(C)CCCCCCCCCCCCCCC(O)=O IEKHISJGRIEHRE-UHFFFAOYSA-N 0.000 description 1
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 description 1
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 235000021357 Behenic acid Nutrition 0.000 description 1
- 229910002483 Cu Ka Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- CTKINSOISVBQLD-UHFFFAOYSA-N Glycidol Chemical compound OCC1CO1 CTKINSOISVBQLD-UHFFFAOYSA-N 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- UMHKOAYRTRADAT-UHFFFAOYSA-N [hydroxy(octoxy)phosphoryl] octyl hydrogen phosphate Chemical compound CCCCCCCCOP(O)(=O)OP(O)(=O)OCCCCCCCC UMHKOAYRTRADAT-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- VBIXEXWLHSRNKB-UHFFFAOYSA-N ammonium oxalate Chemical compound [NH4+].[NH4+].[O-]C(=O)C([O-])=O VBIXEXWLHSRNKB-UHFFFAOYSA-N 0.000 description 1
- 229940058905 antimony compound for treatment of leishmaniasis and trypanosomiasis Drugs 0.000 description 1
- 150000001463 antimony compounds Chemical class 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- 229940116226 behenic acid Drugs 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 description 1
- SBRXLTRZCJVAPH-UHFFFAOYSA-N ethyl(trimethoxy)silane Chemical compound CC[Si](OC)(OC)OC SBRXLTRZCJVAPH-UHFFFAOYSA-N 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 235000013373 food additive Nutrition 0.000 description 1
- 239000002778 food additive Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 150000002611 lead compounds Chemical class 0.000 description 1
- 150000002681 magnesium compounds Chemical group 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- UHNWOJJPXCYKCG-UHFFFAOYSA-L magnesium oxalate Chemical compound [Mg+2].[O-]C(=O)C([O-])=O UHNWOJJPXCYKCG-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- MSRJTTSHWYDFIU-UHFFFAOYSA-N octyltriethoxysilane Chemical compound CCCCCCCC[Si](OCC)(OCC)OCC MSRJTTSHWYDFIU-UHFFFAOYSA-N 0.000 description 1
- 229960003493 octyltriethoxysilane Drugs 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- MOWNZPNSYMGTMD-UHFFFAOYSA-N oxidoboron Chemical class O=[B] MOWNZPNSYMGTMD-UHFFFAOYSA-N 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000003918 potentiometric titration Methods 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical class [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 238000007614 solvation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000003784 tall oil Substances 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
- C01F5/06—Magnesia by thermal decomposition of magnesium compounds
- C01F5/08—Magnesia by thermal decomposition of magnesium compounds by calcining magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
- C30B7/10—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by application of pressure, e.g. hydrothermal processes
Definitions
- the invention relates to chemical technology, specifically to high-purity magnesium oxide and a method for its production.
- Magnesium oxide is a non-toxic, fire-explosion-proof substance and is widely used in the chemical, electrical, electronic, pulp and paper, agricultural, pharmaceutical and food industries, in the production of periclase, rubber, transformer steels, construction, fire-resistant, refractory materials, etc. .
- magnesium oxide is based on the thermal decomposition of magnesium compounds of natural and synthetic origin: magnesium carbonate, basic magnesium carbonate, magnesium hydroxide, magnesium chloride [Mark A. Shand. The Chemistry and technology of magnesia. Wiley-Interscience, 2006; Kirk-Othmer. Encyclopedia of chemical technology. Fourth edition. Vol. 15, p. 353, 354].
- magnesium oxide When obtaining magnesium oxide from natural raw materials, it contains a significant amount of impurities that are present in natural raw materials.
- magnesium oxide of even a small content of impurities such as iron, manganese, chromium, nickel, copper, cobalt and cadmium can impart an undesirable color to products in which it will be used (glasses, polymer products, and so on).
- Synthetic magnesium oxide contains significantly less impurities than magnesium oxide obtained by roasting natural raw materials.
- Important indicators of magnesium oxide are the reactivity (activity) and physicochemical properties of magnesium oxide, which can be characterized by indicators such as specific surface area, pore volume and pore size distribution, modal pore diameter, particle size distribution, viscosity of an aqueous suspension and its stability over time. These indicators of magnesium oxide determine its technological properties: flowability, dispersibility (including in water and organic solvents), the uniformity of its distribution in the polymer matrix, the uniformity of its distribution in other mixtures and forms when used as additives.
- the activity of magnesium oxide can be characterized by such indicators as specific surface area, iodine number activity, lemon number activity, acetic number activity, typical reactivity. Depending on the application, magnesium oxide of the appropriate activity is used.
- magnesium oxide with a specific surface area in the range of 5 to 70 m 2 /g is typically used.
- the reactivity (activity) and physico-chemical properties of magnesium oxide depend on the shape, size and uniformity of the primary particles of magnesium oxide and the shape, size and uniformity of the agglomerates (secondary particles formed by the primary particles of magnesium oxide), as well as on the ratios between them.
- Primary particles and agglomerates are formed at the stages of synthesis and hydrothermal crystallization of the magnesium oxide precursor (magnesium hydroxide, basic magnesium carbonate, magnesium trihydrocarbonate, etc.) and up to a certain firing temperature, magnesium oxide retains the shape of its precursor.
- the primary particles of magnesium oxide can be obtained in the form of particles of indefinite shape, in the form of polygonal plates [JPS6136119, publ. 20.02.1986] thin scales, cubes [JP2007091525, publ. 04/12/2007] and can form agglomerates of various shapes: indefinite shape [WO0183848, publ. 11/08/2001], spherical [JPS6136119, publ. 02/20/1986; JP3821633, publ. 24.04.2001], rod-like [WO2014126075, publ. 08/21/2014; CN107188207, publ. 09/22/2017] and others.
- magnesium oxide will have a different pore volume, pore size distribution and, accordingly, the modal pore diameter, a different proportion of macropores, mesopores and micropores in the total volume. since.
- pores are divided into types according to size: micropores ( ⁇ 2 nm), mesopores (2-50 nm); macropores (>50 nm).
- the volume of macropores characterizes the volume of voids (pores) between particle agglomerates (secondary particles consisting of primary particles).
- Mesopore volume characterizes the volume of interparticle voids (pores) between the primary particles that form an agglomerate and are in contact with each other.
- the volume of micropores characterizes the volume of voids (pores) in the primary particles themselves.
- Primary particle aggregation can occur for various reasons and can be caused, for example, by the presence of a surface charge on particles dispersed in a liquid, settling of ingredients dissolved during the drying process, the presence of an electrostatic charge in the dry state, physical stress during milling, or boundary grain growth in roasting process.
- the powder often has a characteristic ordered particle structure, depending on the types or conditions of production processes and the quality of raw materials [WO0183848, publ. 08.11.2001].
- magnesium oxide manufacturers focus their efforts on the purity, activity and production of magnesium oxide in various shapes and sizes of primary particles and agglomerates that are optimal for a particular application.
- a more thoroughly purified feedstock and firing at higher temperatures can improve the purity of the resulting magnesium oxide.
- a high-purity magnesium oxide powder has been described [JP201211078, publ. 11/01/2012], having a purity of at least 99.9% by weight and a Pb content of less than 0.1 ppb, in which the peak half-width of each of the (111) planes, the (200) plane and the (220) plane, determined by X-ray powder diffraction rays using Cu-Ka radiation is not more than 0.20 degrees and the average particle diameter (d50), measured by laser diffraction, is from 0.1 to 10 ⁇ m.
- an aqueous solution of alkali was added in an amount of 20 mol % to an aqueous solution obtained by mixing anhydrous magnesium chloride and ultrapure water. with respect to magnesium ions, to obtain a suspension of magnesium hydroxide, and then kept the suspension of magnesium hydroxide at a temperature of about 80-100 ° C for 10-100 hours with vigorous stirring at a speed of 15000-3000 rpm.
- the purified magnesium chloride solution obtained after removing the precipitate of magnesium hydroxide adsorbing impurities was used to synthesize magnesium hydroxide by reacting with a purified sodium hydroxide solution.
- the resulting suspension of magnesium hydroxide was subjected to hydrothermal treatment at a temperature of 100–150°C and a time of 0–60 min. According to the authors, when performing autoclaving, crystalline grains of magnesium hydroxide are formed and the impurities contained in the crystals are leached into solution, while the amount of impurities in magnesium hydroxide is reduced.
- the resulting magnesium hydroxide powder was calcined at a temperature of 1000–1500°C.
- JP3980569, publ. 09/26/2007; JP3939102, publ. 07/04/2007; JP3563269, publ. 09/08/2004] describes the preparation of magnesium oxide with a low lead content Pb by calcining dried magnesium hydroxide obtained by the interaction of sea water and calcium hydroxide containing lead or lead compounds in the presence of a halogen source, which is a halide or halogen gas at a temperature of 700-1300 ° C .
- the resulting magnesium oxide with a lead content of less than 2x10 7 mol per 1 mol of magnesium oxide is intended for use as additives for fertilizer, food, raw materials for medicines, cosmetics, etc.
- neither the mass fractions of other impurities, nor the value of the specific surface area or activity, nor the parameters of primary and secondary particles are given by the authors.
- Described magnesium oxide for food additives [patent JP2003033159, publ. 04.02.2003], which has a mass fraction of lead of not more than 10 ppm, the content of particles with a diameter of more than 8 microns is not more than 5 vol.% (by laser diffraction), the specific surface determined by the BET method is in the range from 1 to 50 m 2 / g, citric acid activity from 80 to 450 s.
- the examples show the chemical purity of the obtained magnesium oxide, determined by the method of emission plasma spectrometry (ICP) - the mass fractions of impurities were: lead from 0.3 to 1.4 ppm, chromium no more than 2 ppm, cadmium from 0.2 to 2.4 ppm , copper from 0.1 to 0.2 rrsh.
- the mass fractions of impurities that give color - iron, manganese, nickel, the mass fraction of chlorides are not indicated, and the parameters of primary and secondary particles are not given.
- magnesium oxide powder has been described [JP2007091525, publ. 12.04.2007], containing primary particles and secondary particles, in which a plurality of primary particles are aggregated, having an average particle diameter of 0.5 to 10 ⁇ m and a specific surface area determined by the BET method of 0.1 to 3 m 2 /g.
- Impurities in magnesium oxide were: the mass fraction of chlorides, calcium, aluminum, silicon, iron, sodium and potassium of each is not more than 20 ppm.
- the specified magnesium oxide was obtained by roasting at a temperature of 1200-1400 °C magnesium oxalate having an average particle diameter of 50 to 200 ⁇ m, obtained by reacting aqueous solutions of ammonium oxalate and magnesium chloride.
- Said magnesium oxide powder is intended to be used as a raw material for forming a protective film of the dielectric layer of a color plasma indicator display panel.
- the specific surface area (from 0.1 to 3 m 2 /g) of magnesium oxide indicates its low reactivity, and therefore limited applicability in such areas as food, drugs, catalysts, polymer compositions, as release agent in the production of transformer steels, etc.
- the closest adopted for the prototype is the invention [W02009001883, publ. 31.12.2008], which describes the aggregate of particles of magnesium oxide, consisting of particles of magnesium oxide, having an average size of not more than 1 ⁇ m.
- the aggregate of magnesium oxide particles has a particle diameter of at least 10 ⁇ m, is approximately spherical in shape, and contains impurities of Si, Al, Ca, Fe, V, Cr, Mn, Ni, Zr, V, and Zn each not more than 10 ppm, and the total content of impurities is no more than 100 rsh.
- the magnesium oxide particle aggregate has a first mode size and a second mode size larger than the first mode size in the pore distribution measured by mercury porosimetry, while the first mode size is from 0.1 to 1 ⁇ m, and the second mode size is 8 to 20 ⁇ m.
- the method for obtaining an agglomerate of magnesium oxide particles consists of the following stages: purification of the initial solution of magnesium chloride and an aqueous solution of alkali with freshly precipitated magnesium hydroxide, filtration, synthesis, hydrothermal treatment at a temperature of 100-150 ° C, filtration, washing, drying, firing of magnesium hydroxide powder, dispersion magnesium oxide particles in a solvent and spray drying to obtain aggregates of magnesium oxide particles.
- spherical aggregates improve the dispersibility and fluidity of magnesium oxide powder. But aggregates of spherical shape and high purity have a rather large size of aggregates (at least 10 ⁇ m) and low activity (firing temperature 1400 °C), which limits the scope the specified aggregate of magnesium oxide particles in the production of catalysts, polymer compositions, in transformer steels, etc.
- additional methods of dispersion of magnesium oxide in an organic solvent and subsequent spray drying lead to an increase in the consumption of raw materials, complication of instrumentation and, consequently, an increase in the cost of production.
- the aim of the present invention is to obtain a high-purity magnesium oxide, which has a specific surface area determined by the BET method, from 5 to 70 m 2 /g, an average particle size (d50) determined by the laser diffraction method, not more than 5 ⁇ m, the mass fraction of impurities of each of the elements Pb, Cd, As, Hg no more than 0.1 ppm, mass fraction of impurities of each of the elements Ba, Zn, Ti, Mn, Co, Mo, V, Sb, Sr no more than 1 ppm, mass fraction of impurities of each of the elements Al, F is not more than 5 ppm, the mass fraction of impurities of each of the elements P, Cr, Ni, K, Li is not more than 10 ppm, the mass fraction of Fe is not more than 50 ppm, the mass fraction of Si is not more than 0.01%, the mass fraction of impurities of each of the elements Ca, B is not more than 0.02%, the mass fraction of sulfates SO4
- high-purity magnesium oxide is obtained by calcining the precursor - magnesium hydroxide, obtained by continuous interaction of a concentrated aqueous solution of magnesium chloride with an aqueous solution of sodium hydroxide at a molar ratio of ions OFF: Mg ++ in the range (1.9-L2.1): 1 with a continuous supply of a suspension of magnesium hydroxide seed crystals to the reaction mass, and the magnesium hydroxide seed crystals are pre-treated with a concentrated aqueous solution of magnesium chloride, after the interaction of the reagents, the magnesium hydroxide suspension is sent for aging, while the temperature is maintained at least 40 ° C, then hydrothermal crystallization is carried out particles of magnesium hydroxide in the presence of dihydric alcohol, at a temperature in the range from 120 to 220 °C, a pressure in the range from 0.1 to 2.3 MPa and a duration in the range from 1 to 10 hours.
- an aqueous solution of sodium hydroxide an aqueous solution of sodium hydroxide obtained by an electrochemical method (mercury, diaphragm or membrane electrolysis) is used.
- the use of said aqueous sodium hydroxide solution makes it possible to obtain magnesium hydroxide of a higher purity compared to methods using milk of lime, ammonia water or sodium hydroxide obtained by chemical methods as an alkaline agent.
- an aqueous solution of magnesium chloride of synthetic or natural origin is used, previously purified by known methods from unwanted impurities of heavy metals and/or iron, and/or sulfates, and/or boron, and/or bromine, and/or other undesirable impurities or mixtures thereof, and the final stage of purification is ion-exchange purification.
- ion-exchange resins that are selective for heavy metals
- ion exchange resins are ion exchange resins with iminodiacetic acid chelate groups, for example LEWATIT TP 208 manufactured by Lanxess (Germany), Amberlite IRC 748 manufactured by ROHM and HAAS (USA) or others.
- an aqueous solution of magnesium chloride with a concentration of at least 350 g/DM 3 .
- An increase in the excess of magnesium chloride leads to contamination of the obtained magnesium hydroxide with magnesium chloride, the need to increase the volume of water for washing it, and also to increase the mass fraction of chlorides in the resulting magnesium oxide.
- An increase in excess of an alkaline agent leads to the formation of a fine gel-like magnesium hydroxide precipitate that is difficult to filter, and, consequently, to a decrease in the productivity of the process.
- a suspension of seed crystals of magnesium hydroxide is continuously fed into the zone of continuous interaction of a concentrated aqueous solution of magnesium chloride with an aqueous solution of sodium hydroxide in an amount of 5-200% of the total mass of the supplied initial reagents. Reducing the amount of the suspension of seed crystals to less than 5% does not allow one to obtain a sufficient amount of agglomerates of magnesium hydroxide particles. Increasing the amount of seed crystal suspension above 200% reduces the economic efficiency of the process and does not provide a noticeable improvement in the shape and size of primary particles and agglomerates.
- a previously obtained suspension of magnesium hydroxide crystals is used as the seed crystal suspension.
- the seed crystals of magnesium hydroxide before being fed into the synthesis zone are pre-treated with a concentrated aqueous solution of magnesium chloride, which leads to the formation of a shell of magnesium chloride on the surface of the seed crystals.
- a uniform formation of new (freshly precipitated) particles occurs on the surface of magnesium hydroxide seed crystals magnesium hydroxide, that is, the formation of agglomerates, the core of which is seed crystals.
- the presence of seed crystals in the synthesis zone also contributes to the formation of newly formed particles of magnesium hydroxide according to a given type.
- the suspension of magnesium hydroxide from the synthesis zone is sent to the aging zone. It is known [Wasserman I.M. Chemical precipitation from solutions. L.: Chemistry, 1974, 208 s], that under the conditions of a continuous process of deposition, the growth of sediment particles has its own characteristic features. In the steady-state continuous sedimentation process, all properties of the sediment-solution system are continuously reproduced, and among them the quantitative characteristics of the formation, growth, and properties of new sediment particles are reproduced.
- the precipitate in the reactor has fairly stable properties (structural, granulometric, etc.) and acts as a seed for newly formed particles. Therefore, sediment seeding is a parameter of the deposition process that has a strong influence on the properties of the resulting precipitate.
- the experimentally established effective stirring rate which provides a sufficient area of phase contact and the formation of a certain structure of magnesium hydroxide crystals, is in the range from 20 to 300 rpm.
- Magnesium hydroxide crystals after aging are sent to hydrothermal crystallization to obtain magnesium hydroxide crystals, which are precursors of magnesium oxide crystals.
- Hydrothermal crystallization is carried out in the presence of dihydric alcohol at a temperature in the range of 120 to 220 °C, a pressure in the range of 0.1 to 2.3 MPa, and a duration in the range of 1 to 10 hours.
- this process of hydrothermal crystallization of magnesium hydroxide the formation of a certain structure and size of primary particles and agglomerates consisting of primary particles, and leaching of impurities into the mother liquor, which leads to more efficient washing of magnesium hydroxide crystals from impurities and allows subsequent after firing to obtain magnesium oxide with high purity and specified specific surface area and properties of primary particles and agglomerates.
- a dihydric alcohol for example, ethylene glycol or propylene glycol
- ethylene glycol or propylene glycol in an amount of 0.01-1.0% by weight of magnesium hydroxide at the hydrothermal crystallization stage, is sufficient to prevent uncontrolled agglomeration of magnesium hydroxide particles and secondary coarsening due to the adhesion of agglomerates into blocks.
- dihydric alcohols prevent the agglomeration of magnesium hydroxide particles due to OH groups, which are oriented around magnesium hydroxide particles and form a solvation shell.
- Hydrothermal crystallization of magnesium hydroxide crystals in the presence of dihydric alcohol affects the volume of macropores, mesopores and micropores in the final product and their ratio. With an increase in temperature and an increase in the duration of hydrothermal crystallization in the presence of dihydric alcohol, the content of micropores decreases, while the content of macropores and mesopores increases.
- Hydrothermal crystallization is carried out in the reaction mother liquor, the preferred content of magnesium hydroxide is in the range from 2 to 15 wt %.
- the separation of magnesium hydroxide crystals from the mother liquor is carried out by any known method, for example, by filtering the resulting suspension or settling, followed by filtering the thickened part.
- Washing of magnesium hydroxide crystals from chlorides is carried out by any known method, for example, washing the precipitate with demineralized water on the filter and/or repulping the precipitate, followed by filtration.
- an aqueous solution of sodium hydroxide with a mass fraction of 0.01-0.10% is used as a washing liquid.
- magnesium oxide washed and filtered crystals of magnesium hydroxide with a moisture content of 20-50% wt. calcined in a kiln at a temperature ranging from 700 to 1100 °C.
- the calcination of magnesium hydroxide crystals is carried out intermittent or continuous. During the calcination of magnesium hydroxide crystals, which is the precursor of magnesium oxide crystals, the necessary structure of high-purity magnesium oxide particles is finally formed.
- magnesium oxide is ground in a known manner, for example in a rotary, hammer or jet mill, and modified if necessary.
- the resulting high-purity magnesium oxide has a specific surface area determined by the BET method in the range from 5 to 70 m 2 /g, an average particle size (d50) determined by the laser diffraction method is not more than 5 ⁇ m, the mass fraction of impurities of each of the elements Pb, Cd, As, Hg no more than 0.1 ppm, mass fraction of impurities of each of the elements Ba, Zn, Ti, Mn, Co, Mo, V, Sb, Sr no more than 1 ppm, mass fraction of impurities of each of the elements Al, F no more than 5 ppm, the mass fraction of impurities of each of the elements P, Cr, Ni, K, Li is not more than 10 ppm, the mass fraction of Fe is not more than 50 ppm, the mass fraction of Si is not more than 0.01%, the mass fraction of impurities of each of the elements Ca, B is not more than 0.02%, the mass fraction of sulfates SO4 2 is not more than 0.02%,
- the high-purity magnesium oxide obtained by the above method is composed of primary particles and agglomerates (secondary particles formed by primary magnesium oxide particles).
- magnesium oxide powder improves its flowability, dispersibility and processability (manufacturability), and also contributes to the most uniform distribution of magnesium oxide when used as main components or additives in various mixtures and forms.
- a higher degree of filling can be achieved while maintaining high performance of polymeric materials.
- magnesium oxide powder contributes to a more extended time for the entry of magnesium oxide into chemical reactions, for example, in neutralization and hydration reactions, since non-agglomerated primary particles will be the first to react, and then oxide agglomerates will begin to react.
- Gradual reaction is a useful quality when using magnesium oxide in the composition of medicinal and cosmetic preparations, as well as when using magnesium oxide as a separating agent in the production of transformer steels. Controlled sizes of primary particles, agglomerates and their ratios make it possible to obtain controlled pore volume distributions, total pore volume and modal pore diameter.
- Agglomerated structures are characterized by the presence of macropores, while the pores formed by primary particles that are separate or in the composition of agglomerates are mesopores and micropores.
- the ratio between macropores, mesopores, and micropores indicates the ratio between agglomerates and primary particles, and therefore is an important characteristic for powder materials containing agglomerates.
- High-purity magnesium oxide obtained in this way has a total pore volume in the range of 0.9x10 6 to 1.5x10 6 m 3 /g, determined by mercury porosimetry.
- high-purity magnesium oxide has the following ratio of pore volumes: macropore volume in the range of 85-93% vol., mesopore volume in the range of 6.5-14% vol., micropore volume in the range of 0.5-1.5% vol.
- the modal pore diameter determined by mercury porosimetry is in the range of 150–400 nm.
- High-purity magnesium oxide obtained by this method has an aqueous suspension viscosity of not more than 400 cP, preferably not more than 200 cP, which makes it possible to obtain aqueous suspensions that are technologically convenient for mixing, pumping and dosing in various technological processes.
- High-purity magnesium oxide obtained by this method, ensures the production of suspensions stable in time, which are sedimentation-resistant and have a suspension settling rate of not more than 10% vol. at one o'clock.
- High-purity magnesium oxide obtained by this method has a controlled particle size, the average particle size (d50), determined by laser diffraction, is no more than 5 ⁇ m, the diameter of 10% of the particles is not more than 2 ⁇ m, the diameter of 90% of the particles is not more than 30 ⁇ m.
- the residue on a 325 mesh sieve, determined by the wet screening method is not more than 0.1%, preferably not more than 0.05%.
- High-purity magnesium oxide obtained by this method has a lemon number activity in the range from 40 to 200 s. These activity values of magnesium oxide provide its effectiveness when used in selected applications.
- High-purity magnesium oxide obtained by the proposed method at a relatively low firing temperature of 700-1100 ° C, has high chemical purity, adjustable specific surface, total pore volume, ratio between macro-meso- and micropores, modal pore diameter, particle size distribution and activity, which allows it to be used in pharmaceutical, pharmacopoeial, cosmetic and food industries, in the production of special ceramics, special glasses, optical materials, electronic materials, catalysts, polymer materials, transformer steel and other areas for which the chemical purity of magnesium oxide is important.
- the high-purity magnesium oxide obtained by this process may be modified with one or more surface treatment agents and/or silane coupling agents and/or special additives and/or mixtures thereof.
- surface-treating agents compounds selected from the group of saturated and unsaturated fatty acids containing from 8 to 20 carbon atoms, or their alkali metal and/or alkaline earth metal salts, and/or mixtures thereof, are used.
- examples of such compounds are stearic acid, oleic acid, lauric acid, palmitic acid, behenic acid, myristic acid, tall oil fatty acids, and others.
- silane coupling agents compounds selected from the group of organofunctional trialkoxysilanes, tetraalkoxysilanes, including alkyltriethoxysilanes, alkyltrimethoxysilanes, alkenyltriethoxysilanes, alkenyltrimethoxysilanes, aminosilanes, etc. and/or mixtures thereof, are used.
- Examples of such compounds are methyltriethoxylane, octyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, 3-methacryloxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexy)ethyltrimethoxysilane, oxypropyltrimethoxysilane glycide, aminopropyltriethoxysilane, aminopropyltrimethoxysilane, tetraethoxysilane and others
- Organic and inorganic compounds of silicon, boron, calcium, phosphorus, antimony, titanium or mixtures thereof are used as modifying special additives.
- Silicon compounds include inorganic salts of silicic acids and alkali and alkaline earth metals, silicon dioxide, or mixtures thereof.
- Boron compounds include boron oxides, boric acid and its alkali and alkaline earth metal salts, or mixtures thereof.
- Calcium compounds include calcium carbonate, calcium phosphate, calcium borates, or mixtures thereof.
- Phosphorus compounds include phosphoric acid and phosphonic acids, their alkali and alkaline earth metal salts, or mixtures thereof.
- Antimony compounds include antimony oxide, antimony sulfate, etc., or mixtures thereof.
- Titanium compounds include titanium dioxide and organofunctional titanates such as titanium (IV) 2,2-bis (2 propenolatomethyl) butanolato tris (dioctyl) phosphato-0, titanium (IV) 2,2-bis (2 propenolatomethyl) butanolato tris (dioctyl) pyrophosphate-O, isopropyl triisostearoyl titanate, isopropyl (dioctyl pyrophosphate) titanate, isopropyl tri (N-aminoethyl aminoethyl) titanate and isopropyl tridecyl benzene sulfonyl titanate, or mixtures thereof.
- modifying agents in an amount in the range from 0.001 to 5.0 wt %. in terms of magnesium oxide.
- Modification is carried out by any known method, for example by suspension or dry method.
- volume of micropores and mesopores was determined by nitrogen adsorption using an ASAP 2020 analyzer manufactured by Micrometrics Instrument Corporation (USA);
- the total pore volume was calculated as the sum of the pore volume (macro-, meso- and micro);
- volume fraction of the volume of macro-, meso- and micropores was calculated as the ratio of the volume of macropores or the volume of micropores, or the volume of mesopores to the total pore volume, expressed as a volume percentage; - sieving residue on a 325 mesh sieve was determined by the wet sieving method;
- the synthesis of magnesium hydroxide is carried out in a cascade consisting of three reactors.
- the working volume of each reactor is 120 dm 3 .
- the stirring speed is 45 rpm.
- Hydrothermal crystallization is carried out in an autoclave with a working volume of 1.6 m 3 and a stirring speed of 90 rpm.
- Calcination of the wet precipitate of magnesium hydroxide is carried out in a chamber furnace with three-sided heating brand Nabertherm N500 E (Germany).
- Magnesium chloride solution is prepared by dissolving magnesium chloride hexahydrate in demineralized water, then purified from iron and sulfates and passed through a column filled with Lanxess TP 208 MonoPlus ion exchange resin. In the purified solution, the mass fraction of magnesium chloride is 32.1%.
- a solution of sodium hydroxide obtained by electrolysis with a mercury cathode is diluted with demineralized water to a mass fraction of sodium hydroxide of 16.6%.
- the first reactor of the cascade is simultaneously supplied with a purified solution of magnesium chloride at a rate of 33.5 kg/h and a suspension of seed crystals at a rate of 44 kg/h, directed after aging from the third reactor of the cascade.
- the second reactor of the cascade is simultaneously fed with a sodium hydroxide solution at a rate of 54.4 kg/h and a suspension of seed crystals treated with a magnesium chloride solution from the first reactor.
- the resulting suspension of magnesium hydroxide crystals is continuously sent for aging to the third reactor of the cascade.
- the temperature in all reactors of the cascade is maintained in the range of 50-60 °C.
- the residence time in the cascade of reactors is 2 hours.
- the magnesium hydroxide slurry is filtered. Wet crystals of magnesium hydroxide are washed on the filter with alkaline water with a mass fraction of sodium hydroxide of 0.02%. The pressed precipitate with a moisture content of 48% is fired at a temperature of 950 °C for 2 hours and crushed.
- the solution of bischofite, purified from sulfates and boron, is passed through a column filled with ion exchange resin TP 208 MonoPlus manufactured by Lanxess.
- ion exchange resin TP 208 MonoPlus manufactured by Lanxess In the purified solution, the mass fraction of magnesium chloride is 30.5%.
- the sodium hydroxide solution obtained by diaphragm electrolysis is diluted with demineralized water to a mass fraction of sodium hydroxide of 10.0%.
- the first reactor of the cascade is simultaneously supplied with a purified solution of magnesium chloride at a rate of 35.3 kg/h and a suspension of seed crystals at a rate of 12.6 kg/h, directed after aging from the third reactor of the cascade.
- the second reactor of the cascade is simultaneously fed with a sodium hydroxide solution at a rate of 90.8 kg/h and a suspension of seed crystals treated with a bischofite solution from the first reactor.
- the resulting suspension of magnesium hydroxide crystals is continuously sent for aging to the third reactor of the cascade.
- the temperature in all reactors of the cascade is maintained in the range of 50-60 °C.
- the residence time in the cascade of reactors is about 2 hours.
- a suspension of magnesium hydroxide crystals is sent to hydrothermal crystallization at a temperature of 200 ° C in the presence of 0.05% wt. ethylene glycol by weight of magnesium hydroxide for 1 hour.
- the magnesium hydroxide slurry is filtered. Wet crystals of magnesium hydroxide are washed on the filter with alkaline water with a mass fraction of sodium hydroxide of 0.02%. The pressed precipitate with a moisture content of 38% is fired at a temperature of 850 °C for 2 hours and ground in a hammer mill.
- a magnesium chloride solution is prepared by dissolving magnesium chloride hexahydrate in demineralized water, then desulphated and passed through a column packed with AMBERLITE IRC 748 ion exchange resin manufactured by ROHM and HAAS. In the purified solution, the mass fraction of magnesium chloride is 32.1%.
- the sodium hydroxide solution obtained by membrane electrolysis is diluted with demineralized water to a mass fraction of sodium hydroxide of 12.5%.
- the first reactor of the cascade is simultaneously supplied with a purified solution of magnesium chloride at a rate of 31.8 kg/h and a suspension of seed crystals at a rate of 33.3 kg/h, directed from the second reactor of the cascade.
- the second reactor of the cascade is simultaneously fed with a sodium hydroxide solution at a rate of 68.1 kg/h and a suspension of seed crystals treated with a bischofite solution from the first reactor.
- the resulting suspension of magnesium hydroxide crystals is continuously sent for aging to the third reactor of the cascade.
- the temperature in all reactors of the cascade is maintained in the range of 70-80 °C.
- the residence time in the cascade of reactors is 2 hours.
- the magnesium hydroxide slurry is filtered. Wet crystals of magnesium hydroxide are washed on the filter with alkaline water with a mass fraction of sodium hydroxide of 0.02%. The pressed precipitate with a moisture content of 48% is fired at a temperature of 750 °C for 3 hours and ground in a hammer mill.
- the bischofite solution is purified from bromine, passed through a column filled with AMBERLITE IRC 748 ion exchange resin manufactured by ROHM and HAAS.
- the mass fraction of magnesium chloride is 28.0%.
- the sodium hydroxide solution obtained by diaphragm electrolysis is diluted with demineralized water to a mass fraction of sodium hydroxide of 13.5%.
- the first reactor of the cascade is simultaneously supplied with a purified solution of magnesium chloride at a rate of 63.6 kg/h and a suspension of seed crystals at a rate of 85.5 kg/h, directed from the second reactor of the cascade.
- the second reactor of the cascade is simultaneously supplied with a sodium hydroxide solution at a rate of 110.5 kg/h and a suspension of seed crystals treated with a bischofite solution from the first reactor.
- the resulting suspension of magnesium hydroxide crystals is continuously sent for aging to the third reactor of the cascade.
- the temperature in all reactors of the cascade is maintained in the range of 50-60 °C.
- the residence time in the cascade of reactors is 1 hour.
- the magnesium hydroxide slurry is filtered. Wet crystals of magnesium hydroxide are washed on the filter with demineralized water. The pressed precipitate with a moisture content of 39% is fired at a temperature of 900 °C for 2 hours and ground in a hammer mill.
- the suspension of magnesium hydroxide is filtered, wet crystals of magnesium hydroxide are washed on the filter with demineralized water.
- the pressed precipitate with a moisture content of 65% is fired in a muffle furnace at a temperature of 900 °C for 2 hours and ground in a hammer mill.
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