WO2020032829A1 - Активный высокочистый оксид магния и способ его производства - Google Patents
Активный высокочистый оксид магния и способ его производства Download PDFInfo
- Publication number
- WO2020032829A1 WO2020032829A1 PCT/RU2019/000558 RU2019000558W WO2020032829A1 WO 2020032829 A1 WO2020032829 A1 WO 2020032829A1 RU 2019000558 W RU2019000558 W RU 2019000558W WO 2020032829 A1 WO2020032829 A1 WO 2020032829A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnesium oxide
- crystals
- mass fraction
- active high
- magnesium
- 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 115
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 107
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title abstract description 19
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 83
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 83
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 83
- 239000013078 crystal Substances 0.000 claims abstract description 71
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 38
- 239000000725 suspension Substances 0.000 claims abstract description 27
- 239000007864 aqueous solution Substances 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims abstract description 19
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 18
- 239000003209 petroleum derivative Substances 0.000 claims abstract description 12
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 7
- 150000002500 ions Chemical class 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 27
- 239000000243 solution Substances 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 17
- 238000005406 washing Methods 0.000 claims description 14
- 230000012010 growth Effects 0.000 claims description 12
- 239000011777 magnesium Substances 0.000 claims description 11
- 238000005054 agglomeration Methods 0.000 claims description 9
- 230000002776 aggregation Effects 0.000 claims description 9
- 239000003153 chemical reaction reagent Substances 0.000 claims description 9
- 150000001805 chlorine compounds Chemical class 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 8
- 238000004438 BET method Methods 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 8
- 229910052740 iodine Inorganic materials 0.000 claims description 8
- 239000011630 iodine Substances 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- 239000007900 aqueous suspension Substances 0.000 claims description 7
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 claims description 6
- 235000005979 Citrus limon Nutrition 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 5
- 229910052793 cadmium Inorganic materials 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 5
- 229910001385 heavy metal Inorganic materials 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 238000001953 recrystallisation Methods 0.000 claims description 5
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 229910052787 antimony Inorganic materials 0.000 claims description 4
- 239000012736 aqueous medium Substances 0.000 claims description 4
- 229910052785 arsenic Inorganic materials 0.000 claims description 4
- 229910052788 barium Inorganic materials 0.000 claims description 4
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052745 lead Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 3
- 235000021357 Behenic acid Nutrition 0.000 claims description 3
- 239000005642 Oleic acid Substances 0.000 claims description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- 229940116226 behenic acid Drugs 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- 150000001768 cations Chemical class 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052753 mercury Inorganic materials 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 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
- 239000008117 stearic acid Substances 0.000 claims description 3
- 239000003760 tallow Substances 0.000 claims description 3
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-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
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- 235000021314 Palmitic acid Nutrition 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052794 bromium Inorganic materials 0.000 claims description 2
- 230000003993 interaction Effects 0.000 claims description 2
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims 4
- 239000003513 alkali Substances 0.000 claims 3
- 239000002002 slurry Substances 0.000 claims 3
- 150000001342 alkaline earth metals Chemical class 0.000 claims 2
- AXTGDCSMTYGJND-UHFFFAOYSA-N 1-dodecylazepan-2-one Chemical compound CCCCCCCCCCCCN1CCCCCC1=O AXTGDCSMTYGJND-UHFFFAOYSA-N 0.000 claims 1
- 244000248349 Citrus limon Species 0.000 claims 1
- 235000021313 oleic acid Nutrition 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000000137 annealing Methods 0.000 abstract 1
- 238000011437 continuous method Methods 0.000 abstract 1
- 239000011133 lead Substances 0.000 description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 238000001914 filtration Methods 0.000 description 9
- 238000002156 mixing Methods 0.000 description 8
- 238000004062 sedimentation Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 229910052749 magnesium Inorganic materials 0.000 description 6
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 239000011163 secondary particle Substances 0.000 description 5
- 244000131522 Citrus pyriformis Species 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 239000012452 mother liquor Substances 0.000 description 4
- -1 pharmaceuticals Chemical compound 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 239000002609 medium Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000000575 pesticide Substances 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
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- 238000005979 thermal decomposition reaction 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
- 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
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- 240000007651 Rubus glaucus Species 0.000 description 1
- 235000011034 Rubus glaucus Nutrition 0.000 description 1
- 235000009122 Rubus idaeus Nutrition 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000001636 atomic emission spectroscopy Methods 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000001035 drying Methods 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
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-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
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 235000013373 food additive Nutrition 0.000 description 1
- 239000002778 food additive Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000004820 halides Chemical group 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 150000002611 lead compounds Chemical class 0.000 description 1
- 150000002681 magnesium compounds Chemical group 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 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
- 231100000614 poison Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical class [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 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
-
- 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
-
- 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
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/14—Pore volume
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Definitions
- the invention relates to chemical technology, namely to active high-purity magnesium oxide and a method for its production.
- Magnesium oxide is used in the manufacture of refractory materials, in the electrical and pulp and paper industry, in construction, in the production of rubber, pericles, etc.
- magnesium carbonate The thermal decomposition of magnesium compounds of natural and synthetic origin: magnesium carbonate, basic magnesium carbonate, magnesium hydroxide, magnesium chloride [M. Pozin Technology of mineral salts (fertilizers, pesticides, industrial salts, oxides and acids), part 1, L .: Chemistry, 1974, 792 s; Mark A. Shand. The Chemistry and technology of magnesia. Wiley-Interscience, 2006].
- Magnesium oxide obtained by thermal decomposition of natural raw materials has significant amounts of impurities that are present in natural raw materials.
- Synthetic magnesium oxide obtained from purified reagents is characterized by high chemical purity.
- magnesium oxide can be slightly fired, very fired, tightly sintered, and also fused. In accordance with this, in terms of activity, magnesium oxide can be active (light) and inactive (heavy) [M. Pozin. Technology of mineral salts (fertilizers, pesticides, industrial salts, oxides and acids), part 1, L .: Chemistry, 1974, 792 s; Mark A. Shand. The Chemistry and technology of magnesia. Wiley-Interscience, 2006].
- Active magnesium oxide is used as a filler for rubbers, adhesives, plastics, polymers, as stabilizers in the production of chloroprene rubbers, refining additives of organic solvents, in the production of catalysts, special ceramics, special glasses (photo, film, astro lenses), in the pharmaceutical, pharmacopeia and food industries, in the production of magnesia cements and other magnesium-containing materials.
- the most important indicators of active magnesium oxide include its high reactivity.
- the activity of magnesium oxide can be described by such characteristics as specific surface area, activity according to the iodine number, activity according to the lemon number, activity according to the acetic number, typical reactivity.
- magnesium oxide such as pharmaceuticals, pharmacopeia, the food industry, the production of special ceramics, special glasses, catalysts and others, the chemical purity of magnesium oxide is important.
- magnesium oxide for food additives [patent JP2003033159, publ. 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 ⁇ m is not more than 5 vol.% (By laser diffraction), the specific surface determined by the BET method in the range from 1 to 50 m / 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) - mass fractions of impurities were: lead Pb from 0.3 to 1.4 ppm, chromium Cr no more than 2 ppm, cadmium Cd from 0.2 to 2 , 4 ppm, Cu Cu from 0, 1 to 0.2 ppm.
- ICP emission plasma spectrometry
- a known method of producing active magnesium oxide with a specific surface area of 10-200 m / g, the diameter of the secondary particles d50 in the range of 0, 1-1, 5 ⁇ m and d90 not more than 3.0 ⁇ m [patent EP 0370728, publ. 1989], in which magnesium oxychloride of the formula Mg (OH) 2-x A x mH 2 0 is obtained from magnesium chloride or magnesium nitrate, in which A is C1 or N0 3 , x is a number from 0 to 0.2, and m is an integer from 0 to 6, followed by heating in the mother liquor of the resulting product at elevated or atmospheric pressure at a temperature of from 50 to 200 ° C.
- the disadvantage of this method is to obtain in the first stage a pseudo-amorphous precipitate of magnesium oxychloride, the suspension of which is a viscous gel-like, hardly mixed substance.
- special mixing devices and high mixing speeds are required, which leads to the complication and cost of technology when implementing this method on an industrial scale.
- washing consists of the following stages: a) dispersing magnesium hydroxide or magnesium oxide in water at a temperature of from 80 to 100 ° C with the formation of a turbid liquid having a turbidity density of 5 to 20%; b) vigorously stirring said turbid liquid for 5-60 minutes at a temperature of 80 to 110 ° C by introducing steam into the turbid liquid; and c) separating magnesium hydroxide or magnesium oxide from the turbid liquid.
- the magnesium oxide shown in the examples is highly active — the iodine number is from 136 to 192 mEq of iodine per 100 g of MgO. However, the authors do not give the chemical purity of the obtained magnesium oxide, its particle size distribution and other characteristics.
- JP3563269, publ. 2004; JP3980569, publ. 2007; JP3939102, publ. 2007] describes the preparation of low lead magnesium oxide by calcining magnesium hydroxide obtained by reacting seawater and calcium hydroxide containing lead or a lead compound in the presence of a halogen source that is a halide or gaseous halogen at a temperature of 700-1300 ° C.
- the obtained magnesium oxide with a lead content of less than 2x 10 -7 mol per 1 mol of magnesium oxide is intended for use as additives for fertilizer, food, raw materials for medicines, cosmetics, etc.
- the authors do not provide either the characteristics of the activity of the obtained magnesium oxide, such as the specific surface area or iodine number, nor its particle size distribution.
- the closest adopted for the prototype is the invention [WO2014155764, publ. 2014], in which the particles of magnesium oxide have a specific surface area determined by the BET method in the range from 143 to 200 m 2 / g, the average particle size determined by laser diffraction is not more than 5 ⁇ m and the residue during sieving on a sieve is 45 ⁇ m no more than 0.1% of May.
- a method for producing said magnesium oxide particles comprises the following steps: reacting a water-soluble salt of magnesium, sea water or salt water with an aqueous solution of an alkali metal hydroxide, an aqueous solution of an alkaline earth metal hydroxide or an aqueous ammonia solution to obtain a dispersion in a liquid; introducing the dispersion in the liquid into the reaction of the seed crystal once or repeatedly at a temperature in the range from 1 to 100 ° C, or in hydrothermal treatment at a temperature of from 100 to 200 ° C to obtain the initial material for firing and firing of the starting material at a temperature in the range from 350 to 900 ° C.
- the examples cited indicate a significant excess of magnesium chloride in the synthesis of magnesium hydroxide: molar ratio
- Mg / OH is 1/1, 8, which results in a cake with a high MgCl 2 content and, consequently, an increase in the volume of water for washing magnesium hydroxide from chlorides, as well as in magnesium oxide with a high chloride content.
- the authors do not give the chemical purity of the obtained product, which does not allow us to evaluate its applicability in the main areas of application of active magnesium oxide.
- active magnesium oxide For the use of active magnesium oxide in some areas, for example, in the pharmaceutical industry, when using it as a precursor for the preparation of magnesium-containing compounds, it is necessary to prepare aqueous suspensions of active magnesium oxide. However, aqueous suspensions of active magnesium oxide often have a gel or creamy consistency, which complicates their mixing, pumping and dosing.
- the aim of the present invention is to obtain active high-purity magnesium oxide, which has a specific surface area, determined by the BET method, from 70 to 200 m / g, preferably from 130 to 180 m / g, the average particle size (d50) determined by laser diffraction, not more than 10 microns, preferably not more than 8 microns, iodine number activity in the range from 70 to 200 mg I / g MgO, pore volume from 3.2 x 10 cm / g to 10.2 x 10 cm / g, lemon number activity no more than 40 s, diameter of 10% of particles no more than 2 microns, diameter of 90% of particles no more than 30 microns, mass fraction of residue on a sieve 150 ⁇ m not more than 1%, mass fraction of the residue on the sieve 45 ⁇ m not more than 2%, mass fraction of chlorides not more than 0.1%, mass fraction of calcium not more than 0.1%, mass fraction of substances insoluble in hydrochloric acid not more than 0.05 %
- the active high-purity magnesium oxide, possibly surface-treated is obtained by calcining magnesium hydroxide obtained by the interaction of an aqueous solution of magnesium salt with an alkaline agent.
- the preparation of magnesium hydroxide crystals is carried out in a continuous manner in zones separated and separated from each other: the zone of treatment of seed crystals, the zone of formation and growth of crystals of magnesium hydroxide and the zone of growth and agglomeration of crystals, and an aqueous solution of magnesium chloride in the presence of liquid petroleum products is fed into the zone of processing of seed crystals the suspension of seed crystals of magnesium hydroxide in an amount of 1-80% of the total mass of the supplied starting reagents, in the formation and growth zone are primary x crystals send a suspension of treated crystals of magnesium hydroxide from the previous zone and an alkaline agent with a molar ratio of ions of an alkaline agent and magnesium chloride OH ⁇ : Mg ⁇ in the range (1, 9 ⁇ -2, 1): 1, send
- the technical embodiment of these processes is the continuous formation of magnesium hydroxide in a cascade of reactors with separation of the reaction zones according to their functional purpose: in the first reactor, in which a suspension of seed crystals and a solution of magnesium salt are dosed in the presence of liquid petroleum products, seed crystals are processed; in a second reactor, in which a solution of a magnesium salt with treated seed crystals and an alkaline agent are metered into the reaction mass, which is a suspension of magnesium hydroxide crystals in a sodium chloride solution, the formation of primary magnesium hydroxide particles in crystalline form occurs; In subsequent reactors, ripening, growth, and agglomeration of secondary particles occur on already formed crystals of magnesium hydroxide.
- the seed is the reaction mass from the last reactor, containing magnesium hydroxide crystals with the required filtration and sedimentation properties.
- Necessary and sufficient to provide separated functional zones is from 3 to 5 reactors in the specified cascade of continuous synthesis reactors.
- the length of stay in each individual zone is at least 20 minutes, preferably from 20 minutes to 2 hours, depending on the concentration of the reacting substances and the selected temperature, which should be at least 40 ° C.
- a length of stay in a separate zone of less than 20 minutes does not provide the required filtration and sedimentation properties of the resulting suspension, while a length of stay of more than 2 hours is not economically efficient.
- a solution of magnesium chloride of synthetic or natural origin is used.
- a bischofite solution possibly previously purified by known methods from heavy metals and / or iron, and / or sulfates, and / or boron, and / or bromine, and / or other undesirable impurities.
- agglomerates of crystals of magnesium hydroxide provide effective filtration and sedimentation properties, but contribute to the production of magnesium oxide with increased particle size distribution.
- liquid petroleum products are added to the magnesium chloride solution, which are a product of direct and / or vacuum refining with a boiling point of at least 150 ° C, a boiling point of no higher than 400 ° C, a density of 750 to 880 kg / m 3 the amount of 0.0001-0.01% by weight.
- liquid petroleum products are diesel fuel, low-viscosity marine fuel, kerosene and similar petroleum products.
- liquid petroleum products are adsorbed on the seed crystals of magnesium hydroxide to form a thin film.
- boiling and evaporation of liquid petroleum products occurs at temperatures ranging from 150 to 400 ° C, which leads to rupture and destruction of agglomerates of secondary particles, which facilitates grinding and reduces the size of secondary particles of the obtained active high-purity oxide magnesium.
- Evaporated liquid petroleum products decompose in the kiln to C0 2 and H 2 0.
- an alkali metal hydroxide solution for example, sodium hydroxide solution, is used.
- the molar ratio of the ions of the alkaline agent and magnesium chloride OH: Mg ++ in the range (1.9-2.1) is preferable: 1.
- An increase in the excess of chloride will lead to contamination of the resulting magnesium hydroxide with magnesium chloride, the need to increase the volume of water for washing it, and also increase the mass fraction of chlorides in the obtained magnesium oxide.
- An increase in the excess of alkaline agent will lead to the formation of a finely dispersed, difficult to filter precipitate of magnesium hydroxide, which will lead to a decrease in the productivity of the process.
- the experimentally established effective mixing rate is in the range from 20 to 300 rpm.
- a suspension of finished crystals of magnesium hydroxide in the mother liquor is used as a seed.
- the seed is fed into the first functional zone in an amount of 1-80% of the total mass of the supplied starting reagents.
- Magnesium hydroxide crystals after the zone of crystal growth and agglomeration can be directed to hydrothermal recrystallization 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 24 hours.
- Hydrothermal recrystallization crystals of magnesium hydroxide contributes to a more efficient washing of crystals of magnesium hydroxide from chlorides, as well as reducing the size of the secondary particles of magnesium hydroxide.
- the separation of the crystals of magnesium hydroxide from the mother liquor is carried out by any known method, for example, by filtration of the suspension obtained or by sedimentation, followed by filtration of the thickened part.
- the washing of the crystals of magnesium hydroxide from chlorides is carried out by any known method, for example, washing the filter cake and / or repulping the cake, followed by filtration.
- washing efficiency as a washing liquid using an aqueous solution of sodium hydroxide with a mass fraction of 0.01-0.50%.
- Rinsing of magnesium hydroxide crystals is carried out in one or two stages: in the first stage, magnesium hydroxide crystals are washed on the filter with demineralized water and / or alkaline water, which is an aqueous solution of sodium hydroxide with a mass fraction of 0.01-0.50%, in the second stage, crystals magnesium hydroxide is dispersed in an aqueous medium, including demineralized water and / or alkaline water, which is an aqueous solution of sodium hydroxide with a mass fraction of 0.01-0.50%, in a mass ratio aqueous medium: magnesium hydroxide in the range (5 ⁇ 30): 1, with the formation suspensions of magnesium hydroxide and filtered.
- the washed crystals of magnesium hydroxide are calcined in a kiln at a temperature in the range from 300 to 700 ° C and ground. Calcination of magnesium hydroxyl crystals is carried out in a batch or continuous manner.
- the resulting active high-purity magnesium oxide has a specific surface area, determined by the BET method, from 70 to 200 m 2 / g, an average particle size (d50) determined by laser diffraction, not more than 10 ⁇ m, the iodine number activity in the range from 70 to 200 mg I / g MgO, activity in lemon number no more than 40 s, pore volume in the range from 3.2 x cm / g to 10.2 x 10 cm / g, diameter of 10% of particles no more than 2 microns, diameter of 90% of particles not more than 30 microns, the mass fraction of the residue on the sieve of 150 microns is not more than 1%, the mass fraction of the residue on the sieve of 45 microns is not more than 2%, the mass fraction of chlorides is not more than 0.1%, ma the total calcium fraction is not more than 0.1%, the mass fraction of substances insoluble in hydrochloric acid is not more than 0.05%, the mass fraction of iron is not more than 0.005%, the
- the specified magnesium oxide has a mass fraction of carbonates of not more than 1%, a mass fraction of manganese Mn not more than 2 ppm.
- the specified magnesium oxide has a dynamic viscosity of an aqueous suspension of not more than 30 cP, which allows to obtain aqueous suspensions with a reduced viscosity, technologically convenient for mixing, pumping and dosing.
- the active high-purity magnesium oxide obtained by this method can be modified with one or more surface-treating agents and / or silane coupling agents.
- Compounds selected from the group of saturated and unsaturated fatty acids containing from 8 to 20 carbon atoms or their alkali metal salts and / or mixtures thereof are used as surface-treating agents.
- Examples of such compounds are stearic, oleic acid, lauric acid, palmitic acid, behenic acid, myristic acid, tallow oil fatty acids and others.
- silane coupling agents compounds are selected from the group of organofunctional trialkoxysilanes, including alkyltriethoxysilanes, alkyltrimethoxysilanes, alkenyltriethoxysilanes, alkenyltrimethoxysilanes, aminosilanes, etc. and / or mixtures thereof.
- organofunctional trialkoxysilanes including alkyltriethoxysilanes, alkyltrimethoxysilanes, alkenyltriethoxysilanes, alkenyltrimethoxysilanes, aminosilanes, etc. and / or mixtures thereof.
- examples of such compounds are methyltriethoxysilane, octyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyl-tris- (2-methoxyethoxy) silane,
- the surface treatment is carried out in any known manner, for example, in a suspension or dry manner.
- Active high-purity magnesium oxide obtained by the proposed method has adjustable activity and particle size distribution, high chemical purity, which allows it to be used in the pharmaceutical, pharmacopeia and food industries, in the production of catalysts, special ceramics, special glasses, as a filler for rubbers, adhesives, plastics, polymers, as stabilizers in the production of chloroprene rubbers, refining additives of organic solvents, in the production of magnesia cements and other magnesium-containing materials.
- the process of obtaining crystals of magnesium hydroxide is carried out in a continuous mode at the installation, which is a cascade of three reactors equipped with mixing devices of the anchor type with a speed of 37.
- the working volume of the reactors is 120 dm.
- the temperature in all reactors of the cascade is maintained at 50-60 ° C.
- the bischofite solution previously purified from heavy metals and iron, with a mass fraction of magnesium chloride of 31.6%, a mass fraction of diesel fuel of 0.001% with a flow rate of 24.8 kg / h and a seed with a flow rate of 38.5 kg / are continuously fed into the first reactor of the cascade h
- the seed is a suspension of finished crystals coming from the last reactor of the cascade.
- a suspension of seed crystals of magnesium hydroxide treated with bischofite solution from the first reactor enters the second reactor of the cascade.
- a sodium hydroxide solution with a mass fraction of 9.3% at a rate of 70.7 kg / h is supplied to the second cascade reactor.
- the resulting suspension of magnesium hydroxide crystals from the second reactor is sent to a third cascade reactor containing a suspension of formed magnesium hydroxide crystals.
- the residence time in the cascade of reactors is 1 hour
- Magnesium hydroxide crystals are filtered, washed on the filter with alkaline water, which is an aqueous solution of sodium hydroxide with a mass fraction of 0.05%, with a mass ratio of alkaline water: magnesium hydroxide equal to 10: 1, then dispersed in alkaline water, which is an aqueous solution of hydroxide sodium with a mass fraction of 0.01%, in a mass ratio of alkaline water: magnesium hydroxide, equal to 20: 1, with the formation of a suspension of magnesium hydroxide and filtered.
- the magnesium hydroxide crystals are heated in the kiln at a rate of 10 ° C / min, calcined for 2 hours at a temperature of 600 ° C, ground in a hammer mill, and high-purity active magnesium oxide is obtained.
- the preparation of magnesium oxide is carried out analogously to example 1, except that a bischofite solution with a mass fraction of low viscosity marine fuel 0.0002% is fed, a sodium hydroxide solution with a mass fraction of 9.3% with a flow rate of 71.1 kg / h is fed into the second cascade reactor , washing on the filter is carried out with demineralized water with a mass ratio of demineralized water: magnesium hydroxide equal to 6: 1, after washing with In the filter, magnesium hydroxide crystals are dispersed in demineralized water and filtered.
- Cake magnesium hydroxide is calcined at a temperature of 450 ° C.
- the preparation of magnesium oxide is carried out analogously to example 1, except that a bischofite solution, purified from heavy metals, iron and sulfates with a mass fraction of low-viscosity marine fuel 0.0002%, is fed, a suspension of magnesium hydroxide from the third cascade reactor is sent to hydrothermal recrystallization for 2 h at a temperature of 170 ° C and a pressure of 0.6 MPa, washing the crystals of magnesium hydroxide is carried out on the filter with a mass ratio of alkaline water: magnesium hydroxide equal to 6: 1, dispersion of the crystals is not carried out.
- Cake magnesium hydroxide is calcined at a temperature of 450 ° C.
- the preparation of magnesium oxide is carried out analogously to example 3, except that the crystals of magnesium hydroxide after washing are dispersed in alkaline water, which is an aqueous solution of sodium hydroxide with a mass fraction of 0.05%, in a mass ratio of alkaline water: magnesium hydroxide, equal to 20: 1 , with the formation of a suspension of magnesium hydroxide and filtered.
- alkaline water which is an aqueous solution of sodium hydroxide with a mass fraction of 0.05%, in a mass ratio of alkaline water: magnesium hydroxide, equal to 20: 1 , with the formation of a suspension of magnesium hydroxide and filtered.
- Cake magnesium hydroxide is calcined at a temperature of 450 ° C.
- Example 3 200 g of magnesium oxide obtained in Example 3 are loaded into a Henschel type mixer, 7 g of stearic acid are fed, and stirred at a temperature of 80 ° C for 10-20 minutes. Get surface-treated magnesium oxide, the mass fraction of stearic acid is 3.5%.
- the above examples demonstrate the essence of the invention, are an illustration and do not limit the scope of the claimed invention.
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JP2021530773A JP2022502340A (ja) | 2018-08-09 | 2019-08-07 | 活性高純度酸化マグネシウム及びその製造方法 |
US17/267,416 US20210292180A1 (en) | 2018-08-09 | 2019-08-07 | Active high purity magnesium oxide and its production method |
SG11202101237RA SG11202101237RA (en) | 2018-08-09 | 2019-08-07 | Active highly pure magnesium oxide and method for the production thereof |
MX2021001571A MX2021001571A (es) | 2018-08-09 | 2019-08-07 | Óxido de magnesio activo de alta pureza y su método de producción. |
KR1020217006557A KR102560453B1 (ko) | 2018-08-09 | 2019-08-07 | 활성 고순도 산화 마그네슘 및 이의 생산 방법 |
EP19846705.2A EP3835264A4 (en) | 2018-08-09 | 2019-08-07 | ACTIVE HIGH PURITY MAGNESIUM OXIDE AND PROCESS FOR ITS PRODUCTION |
CN201980061345.9A CN112714751B (zh) | 2018-08-09 | 2019-08-07 | 活性高纯度氧化镁及其生产方法 |
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- 2019-08-07 US US17/267,416 patent/US20210292180A1/en active Pending
- 2019-08-07 CN CN201980061345.9A patent/CN112714751B/zh active Active
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SG11202101237RA (en) | 2021-03-30 |
EP3835264A4 (en) | 2022-05-11 |
CN112714751B (zh) | 2023-06-23 |
KR102560453B1 (ko) | 2023-07-27 |
MX2021001571A (es) | 2021-07-15 |
KR20210035298A (ko) | 2021-03-31 |
RU2690808C1 (ru) | 2019-06-05 |
EP3835264A1 (en) | 2021-06-16 |
US20210292180A1 (en) | 2021-09-23 |
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