CN113549345A - Preparation method and system of titanium dioxide for plastics - Google Patents
Preparation method and system of titanium dioxide for plastics Download PDFInfo
- Publication number
- CN113549345A CN113549345A CN202110985336.8A CN202110985336A CN113549345A CN 113549345 A CN113549345 A CN 113549345A CN 202110985336 A CN202110985336 A CN 202110985336A CN 113549345 A CN113549345 A CN 113549345A
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- China
- Prior art keywords
- titanium dioxide
- slurry
- plastics
- titanium
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 564
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 238
- 239000004033 plastic Substances 0.000 title claims abstract description 110
- 229920003023 plastic Polymers 0.000 title claims abstract description 110
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 118
- 238000000576 coating method Methods 0.000 claims abstract description 92
- 239000002002 slurry Substances 0.000 claims abstract description 87
- 239000000843 powder Substances 0.000 claims abstract description 86
- 239000002245 particle Substances 0.000 claims abstract description 84
- 238000000034 method Methods 0.000 claims abstract description 50
- 238000005406 washing Methods 0.000 claims abstract description 44
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000011247 coating layer Substances 0.000 claims abstract description 30
- 239000002131 composite material Substances 0.000 claims abstract description 22
- 238000004806 packaging method and process Methods 0.000 claims abstract description 17
- 238000001694 spray drying Methods 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 238000007885 magnetic separation Methods 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 14
- 238000009736 wetting Methods 0.000 claims abstract description 14
- 238000004537 pulping Methods 0.000 claims abstract description 12
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010298 pulverizing process Methods 0.000 claims abstract description 8
- 235000010215 titanium dioxide Nutrition 0.000 claims description 268
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 55
- 229910052719 titanium Inorganic materials 0.000 claims description 51
- 239000010936 titanium Substances 0.000 claims description 51
- 238000004519 manufacturing process Methods 0.000 claims description 44
- 239000002253 acid Substances 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 33
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims description 23
- -1 alcohol amine compound Chemical class 0.000 claims description 21
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 20
- 239000008367 deionised water Substances 0.000 claims description 19
- 229910021641 deionized water Inorganic materials 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 239000007822 coupling agent Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 150000003839 salts Chemical class 0.000 claims description 16
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 13
- 239000004094 surface-active agent Substances 0.000 claims description 13
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 12
- 239000012141 concentrate Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 238000004061 bleaching Methods 0.000 claims description 11
- 238000001354 calcination Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 11
- 239000012298 atmosphere Substances 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 9
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 238000002425 crystallisation Methods 0.000 claims description 8
- 230000008025 crystallization Effects 0.000 claims description 8
- 239000010408 film Substances 0.000 claims description 8
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 8
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 239000008394 flocculating agent Substances 0.000 claims description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 239000003610 charcoal Substances 0.000 claims description 6
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 6
- 239000000194 fatty acid Substances 0.000 claims description 6
- 229930195729 fatty acid Natural products 0.000 claims description 6
- 150000004665 fatty acids Chemical class 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 230000007062 hydrolysis Effects 0.000 claims description 6
- 238000006460 hydrolysis reaction Methods 0.000 claims description 6
- 238000010902 jet-milling Methods 0.000 claims description 6
- 150000007524 organic acids Chemical class 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- NDAUXUAQIAJITI-UHFFFAOYSA-N albuterol Chemical class CC(C)(C)NCC(O)C1=CC=C(O)C(CO)=C1 NDAUXUAQIAJITI-UHFFFAOYSA-N 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 239000000080 wetting agent Substances 0.000 claims description 5
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 4
- 238000005903 acid hydrolysis reaction Methods 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 4
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 4
- 229910000160 potassium phosphate Inorganic materials 0.000 claims description 4
- 235000011009 potassium phosphates Nutrition 0.000 claims description 4
- 235000010413 sodium alginate Nutrition 0.000 claims description 4
- 239000000661 sodium alginate Substances 0.000 claims description 4
- 229940005550 sodium alginate Drugs 0.000 claims description 4
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 claims description 4
- 238000001132 ultrasonic dispersion Methods 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
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-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
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 claims description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000005642 Oleic acid Substances 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- 150000004645 aluminates Chemical class 0.000 claims description 3
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 claims description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 3
- 229940102253 isopropanolamine Drugs 0.000 claims description 3
- 235000020778 linoleic acid Nutrition 0.000 claims description 3
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 claims description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 3
- 239000011976 maleic acid Substances 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
- 235000021313 oleic acid Nutrition 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 3
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 claims description 3
- 238000010009 beating Methods 0.000 claims description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 abstract description 6
- 238000005054 agglomeration Methods 0.000 abstract description 5
- 230000002776 aggregation Effects 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 4
- 239000002932 luster Substances 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000007788 liquid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 239000012044 organic layer Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000006148 magnetic separator Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- JVMPJVROHTYUSG-UHFFFAOYSA-N 1-(4-bromothiophen-2-yl)-2-[(2-phenoxyphenyl)methylamino]ethanol Chemical compound C=1C(Br)=CSC=1C(O)CNCC1=CC=CC=C1OC1=CC=CC=C1 JVMPJVROHTYUSG-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 150000001343 alkyl silanes Chemical class 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000004595 color masterbatch Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3692—Combinations of treatments provided for in groups C09C1/3615 - C09C1/3684
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
- C01G23/0532—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing sulfate-containing salts
- C01G23/0534—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing sulfate-containing salts in the presence of seeds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/08—Drying; Calcining ; After treatment of titanium oxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3615—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
- C09C1/3623—Grinding
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
- C09C1/3661—Coating
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3669—Treatment with low-molecular organic compounds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3676—Treatment with macro-molecular organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3684—Treatment with organo-silicon compounds
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Abstract
The invention provides a preparation method and a system of titanium dioxide for plastics, which comprises the following steps: crushing and magnetic separation, preparing rutile titanium dioxide coarse gravel by a sulfuric acid method, grinding and crushing, pulping and dispersing, inorganic coating, washing, spray drying, organic coating, airflow crushing and packaging. The ferrotitanium placer powder is magnetically separated, and impurities in the ferrotitanium placer powder are strictly controlled, so that the color and luster degree of a finished product are ensured; the wetting dispersant is used for dispersing the slurry, so that the continuity, integrity and uniformity during subsequent coating are ensured; the inorganic coating is carried out by sequentially utilizing titanium dioxide and aluminum oxide, so that the inorganic coating layer is more uniform and compact; the composite organic coating agent is used for organic coating, so that secondary agglomeration is prevented, and the compatibility and temperature resistance of titanium dioxide in plastics are improved; the particle size of the titanium dioxide is 0.15-0.3 mu m through airflow pulverization, so that the titanium dioxide has a bluish-white hue. Solves the problem of how to improve the quality of the titanium dioxide for plastics.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a preparation method and a system of titanium dioxide for plastics.
Background
Titanium dioxide, also known as titanium white, is a white solid or powdered amphoteric oxide, has no toxicity, opacity, strong adhesion and good chemical stability, and is widely applied to the industrial fields of coatings, plastics, papermaking, printing ink, chemical fibers, rubber, cosmetics and the like. Titanium dioxide is generally classified into Anatase type (Anatase, abbreviated as a type) and Rutile type (Rutile, abbreviated as R type).
With the development of world science and technology in the late part of the last century, the plastic industry has developed vigorously, and at the same time, the use of titanium dioxide in plastics has jumped the second largest use of titanium dioxide. The use of titanium dioxide in the plastics industry is not only useful as a white pigment and to increase the high opacity of plastics, but also more often, the use of titanium dioxide can be used to take advantage of its optical properties, for example to absorb uv light or to scatter light.
The requirements of the plastics industry for titanium dioxide are: fine particle, strong blue base phase, high coloring power, good dispersibility, good fluidity, good light resistance and heat resistance (the heat resistance of titanium dioxide is important because most of plastic products need to be heated during manufacturing), and the like, and in addition, the titanium dioxide used in the plastic industry is generally subjected to oleophilic treatment to improve the fluidity of the titanium dioxide in the plastic material in a plastic molten state.
In order to meet the requirements of titanium dioxide for plastics, common titanium dioxide is usually ground and coated, and in order to ensure the stability of the coating, two coatings are usually carried out, wherein an inorganic coating (such as silicon oxide) is used for the first time, and an organic coating is used for the second time so as to improve the fluidity and compatibility of the titanium dioxide in the plastic. For example, the patent application No. 201210588826.5 entitled "preparation method of titanium dioxide pigment special for plastic color master batch" discloses a scheme of using hydrated alumina as an inorganic coating layer and using a mixture of polyether modified polysiloxane and amino long-chain alkane co-modified polysiloxane as an organic coating layer; also, for example, the patent application No. 201010208548.7 entitled "titanium dioxide organic coating technology for PVC plastic profiles" discloses that titanium dioxide with silicon-aluminum inorganic coating is coated by organosilicon material, wherein the organosilicon material is one or more silane compounds containing methyl-terminated polysiloxane, hydroxyl-terminated polysiloxane and alkyl silane; further, as disclosed in patent application No. 200980146018.X entitled "surface-treated titanium dioxide pigment for plastics and process for preparing the same" there are sequentially coated titanium dioxide particles with a silica layer, an alumina layer and an organic layer, wherein the organic layer comprises at least one compound selected from H-siloxanes, silicone oils and organo-functionalized polysiloxanes.
Although the prior art discloses various methods for producing titanium dioxide for plastics, the quality of the produced titanium dioxide is poor; in addition, due to the selection of the organic layer, the coated titanium dioxide is not suitable for all plastic materials, namely, the coated titanium dioxide is selective to the plastic materials, so that the application range of the coated titanium dioxide is limited.
Disclosure of Invention
The invention aims to provide a preparation method and a system of titanium dioxide for plastics, which at least solve the problem of improving the quality of the titanium dioxide for plastics.
In order to solve the technical problems, the invention provides a preparation method of titanium dioxide for plastics, which comprises the following steps:
crushing and magnetic separation: drying and crushing ilmenite under vacuum to form ilmenite powder with the particle size of not more than 0.3 mm; carrying out magnetic separation on the ilmenite powder to obtain titanium concentrate powder;
preparing rutile type titanium white coarse gravel by a sulfuric acid method;
grinding and crushing: grinding the rutile type titanium white coarse gravel to obtain titanium white powder with the particle size not greater than 20 mu m;
pulping and dispersing: adding the titanium dioxide powder and a wetting dispersant into deionized water, stirring and adjusting the pH of the solution to 8-12 to prepare slurry; wherein the wetting and dispersing agent comprises hydroxide and an alcohol amine compound;
inorganic coating: firstly, carrying out primary inorganic coating on the slurry by using titanium dioxide, and then carrying out secondary inorganic coating on the slurry subjected to primary inorganic coating by using aluminum oxide;
washing with water: washing the inorganic coated slurry with deionized water for 30-45 minutes;
spray drying: spray drying the slurry after washing to obtain titanium dioxide particles, wherein the drying temperature is 320-420 ℃, the nozzle pressure is 1.2-1.5 MPa, and the spraying speed is 25000-30000 r/min;
organic coating: carrying out organic coating on the titanium dioxide particles by using a composite organic coating agent;
airflow crushing: under the atmosphere of nitrogen, under the environment that the air pressure is 0.8-1.3 MPa and the temperature is 320-350 ℃, carrying out airflow crushing on the titanium dioxide particles after organic coating to obtain titanium dioxide for plastics with the particle size of 0.15-0.3 mu m;
and (6) packaging.
Optionally, in the method for preparing titanium dioxide for plastics, the method for preparing rutile titanium dioxide coarse gravel by the sulfuric acid method comprises the following steps:
acid hydrolysis: adding titanium concentrate powder into sulfuric acid with the concentration of more than 75%, heating to 90-120 ℃ under the mixed atmosphere of hydrogen chloride, carbon monoxide and nitrogen, and stirring for 3-4 hours to obtain acidolysis solution;
and (3) precipitation: after the temperature of the acidolysis solution is reduced to 26-35 ℃, adding a flocculating agent into the acidolysis solution, stirring for 30-40 minutes, standing for more than 24 hours, and filtering to obtain a titanium solution;
vacuum crystallization: crystallizing the titanium solution in a vacuum environment, separating out ferrous sulfate heptahydrate, and separating the ferrous sulfate heptahydrate to obtain pure titanium solution;
concentration and hydrolysis: performing film evaporation on the pure titanium solution to enable the pure titanium solution to become a concentrated titanium solution with the concentration of 220 g/L; adding rutile type seed crystals into the concentrated titanium solution at the temperature of 130-155 ℃ and the pressure of 0.2-0.4 MPa, fully curing, and adjusting the pH value to be 6-8 to obtain metatitanic acid;
and (3) washing and bleaching: bleaching the metatitanic acid by using sulfuric acid and trivalent titanium to obtain bleached metatitanic acid;
washing salt with water: washing bleached metatitanic acid with deionized water, and adding potassium phosphate, potassium carbonate and phosphoric acid into the washed metatitanic acid to obtain a metatitanic acid solution after salt treatment;
and (3) calcining: and calcining the metatitanic acid solution subjected to salt treatment at 980-1330 ℃ to obtain rutile type titanium white coarse gravel.
Optionally, in the preparation method of titanium dioxide for plastics, the flocculant includes 20-35 wt% of polyacrylamide, 30-50 wt% of polyaluminium sulfate, 12-36 wt% of bamboo charcoal fiber, 14-22 wt% of polyferric sulfate and 3-8 wt% of acrylic acid.
Optionally, in the preparation method of titanium dioxide for plastics, the pulping and dispersing method includes:
adding the titanium dioxide powder into deionized water to prepare slurry, and stirring for 15-20 minutes at a stirring speed of 2000-2800 r/min;
adding hydroxide into the slurry to adjust the pH to 8-12;
adding an alcamine compound, performing ultrasonic dispersion for 30-60 minutes, and then performing sanding for 45-60 minutes by using a sand mill so as to disperse the average particle size of the titanium dioxide powder in the slurry below 0.32 mu m.
Optionally, in the preparation method of titanium dioxide for plastics, the hydroxide is sodium hydroxide; the alcamines compounds comprise one or more of ethanolamine, triethanolamine, isopropanolamine and deuterated albuterol.
Optionally, in the preparation method of titanium dioxide for plastics, the alcohol amine compound includes 48-62% by weight of ethanolamine, 22-44% by weight of triethanolamine and 10-28% by weight of deuterated albuterol amine.
Optionally, in the preparation method of the titanium dioxide for plastics, the concentration of the alcohol amine compound in the slurry after the alcohol amine compound is added is 0.05-0.3%.
Optionally, in the preparation method of titanium dioxide for plastics, the method for inorganic coating includes:
stirring the slurry at the speed of 20-60 r/min, heating the slurry to 42-53 ℃, adding titanium dioxide powder, and curing for 1-2 hours to form a titanium dioxide coating layer on the surface of titanium dioxide powder particles in the slurry;
keeping the stirring speed unchanged, heating the slurry to 65-75 ℃, adding nano alumina powder, adjusting the pH of the slurry to 8-10, curing for 2-3 hours to form a hydrated alumina coating layer on the surface of the titanium dioxide coating layer; wherein the addition amount of the nano alumina powder is 20 to 30 percent of the mass of the titanium dioxide powder in the slurry.
Optionally, in the preparation method of the titanium dioxide for plastics, the composite organic coating agent comprises, by weight, 28% to 66% of composite organic silicon, 22% to 35% of polystyrene, 18% to 21% of sodium alginate, 12% to 25% of polyethylene glycol and 6% to 10% of triphenylamine.
Optionally, in the preparation method of titanium dioxide for plastics, the method for coating organic film includes:
preparing a composite organic coating agent;
stirring titanium dioxide particles at the speed of 30-80 r/min, heating the titanium dioxide particles to 80-95 ℃, adding the prepared organic coating agent, and curing for 1.5-3 hours to form an organic coating layer on the surface of the hydrated alumina coating layer; wherein the concentration of the organic coating agent is 0.1-0.5%, and each 1kg of titanium dioxide particles are matched with 200-800 ml of the organic coating agent.
Optionally, in the preparation method of the titanium dioxide for plastics, a surfactant is added during jet milling, wherein the addition amount of the surfactant is 5-12 g per kilogram of titanium dioxide particles.
Optionally, in the preparation method of titanium dioxide for plastics, the surfactant comprises one or more of a coupling agent, a higher fatty acid, an unsaturated organic acid and organosilicon; wherein the coupling agent comprises one or more of silane coupling agent, titanate coupling agent, aluminate coupling agent and phosphate coupling agent; the higher fatty acid comprises one or more of stearic acid, oleic acid, linoleic acid and ligninic acid; the unsaturated organic acid comprises one or more of acrylic acid, crotonic acid and maleic acid.
In order to solve the above technical problems, the present invention also provides a production system of titanium dioxide for plastics, for performing the production method of titanium dioxide for plastics as described in any one of the above, the production system comprising a rutile type titanium dioxide production line and a titanium dioxide production line for plastics; the rutile type titanium dioxide production line is used for producing rutile type titanium white boulder by utilizing a titanium white production process by a sulfuric acid method; the titanium dioxide production line for plastics is used for treating the rutile type titanium white coarse gravel produced by the rutile type titanium dioxide production line to obtain the titanium dioxide for plastics.
Optionally, in the preparation system of titanium dioxide for plastics, the production line of titanium dioxide for plastics comprises a ball mill pulverizer, a dispersion tank, an inorganic coating treatment tank, a ceramic membrane washing machine, a spray dryer, an organic coating treatment tank, an air flow pulverizer and an automatic packaging machine, which are sequentially arranged; the ball-milling pulverizer is used for carrying out ball-milling pulverization on the rutile type titanium white coarse gravel to obtain titanium white powder; the dispersing tank is used for pulping and dispersing the titanium dioxide powder to prepare slurry; the inorganic coating treatment tank is used for performing inorganic coating and water washing on the slurry; the ceramic membrane washing machine is used for washing the slurry by using a ceramic membrane; the spray dryer is used for spray drying the slurry to obtain titanium dioxide particles; the organic coating treatment tank is used for carrying out organic coating on titanium dioxide particles; the jet mill is used for jet milling the titanium dioxide particles coated with the organic coating to obtain titanium dioxide for plastics; the automatic packaging machine is used for automatically packaging the titanium dioxide for the plastic.
The invention provides a preparation method and a system of titanium dioxide for plastics, which comprises the following steps: crushing and magnetic separation: drying and crushing ilmenite under vacuum to form ilmenite powder with the particle size of not more than 0.3 mm; carrying out magnetic separation on the ilmenite powder to obtain titanium concentrate powder; preparing rutile type titanium white coarse gravel by a sulfuric acid method; grinding and crushing: grinding the rutile type titanium white coarse gravel to obtain titanium white powder with the particle size not greater than 20 mu m; pulping and dispersing: adding the titanium dioxide powder and a wetting dispersant into deionized water, stirring and adjusting the pH of the solution to 8-12 to prepare slurry; wherein the wetting and dispersing agent comprises hydroxide and an alcohol amine compound; inorganic coating: firstly, carrying out primary inorganic coating on the slurry by using titanium dioxide, and then carrying out secondary inorganic coating on the slurry subjected to primary inorganic coating by using aluminum oxide; washing with water: washing the inorganic coated slurry with deionized water for 30-45 minutes; spray drying: spray drying the slurry after washing to obtain titanium dioxide particles, wherein the drying temperature is 320-420 ℃, the nozzle pressure is 1.2-1.5 MPa, and the spraying speed is 25000-30000 r/min; organic coating: carrying out organic coating on the titanium dioxide particles by using a composite organic coating agent; airflow crushing: under the atmosphere of nitrogen, under the environment that the air pressure is 0.8-1.3 MPa and the temperature is 320-350 ℃, carrying out airflow crushing on the titanium dioxide particles after organic coating to obtain titanium dioxide for plastics with the particle size of 0.15-0.3 mu m; and (6) packaging. The ferrotitanium placer powder is magnetically separated, and impurities in the ferrotitanium placer powder are strictly controlled, so that the color and luster degree of a finished product are ensured; the wetting dispersant is used for dispersing the slurry, so that the continuity, integrity and uniformity during subsequent coating are ensured; the inorganic coating is carried out by sequentially utilizing titanium dioxide and aluminum oxide, so that the inorganic coating layer is more uniform and compact; the composite organic coating agent is used for organic coating, so that secondary agglomeration is prevented, and the compatibility and temperature resistance of titanium dioxide in plastics are improved; the particle size of the titanium dioxide is 0.15-0.3 mu m through airflow pulverization, so that the titanium dioxide has a bluish-white hue. Solves the problem of how to improve the quality of the titanium dioxide for plastics.
Drawings
FIG. 1 is a flow chart of a process for producing titanium dioxide for plastics according to the present example;
FIG. 2 is a flow chart of the method for producing rutile titanium dioxide gravels by a sulfuric acid process according to the embodiment;
FIG. 3 is a schematic structural view of a system for producing titanium dioxide for plastics according to the present embodiment;
FIG. 4 is a schematic structural view of the rutile titanium dioxide production line provided in this example;
fig. 5 is a schematic structural diagram of the production line of titanium dioxide for plastics according to this embodiment.
Detailed Description
The following provides a detailed description of the method and system for preparing titanium dioxide for plastics according to the present invention with reference to the accompanying drawings and specific examples. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order, and it is to be understood that such structures as are used are interchangeable where appropriate. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
This example provides a method for preparing titanium dioxide for plastics, as shown in fig. 1, the method comprising:
crushing and magnetic separation: drying and crushing ilmenite under vacuum to form ilmenite powder with the particle size of not more than 0.3 mm; carrying out magnetic separation on the ilmenite powder to obtain titanium concentrate powder;
preparing rutile type titanium white coarse gravel by a sulfuric acid method;
grinding and crushing: grinding the rutile type titanium white coarse gravel to obtain titanium white powder with the particle size not greater than 20 mu m;
pulping and dispersing: adding the titanium dioxide powder and a wetting dispersant into deionized water, stirring and adjusting the pH of the solution to 8-12 to prepare slurry; wherein the wetting and dispersing agent comprises hydroxide and an alcohol amine compound;
inorganic coating: firstly, carrying out primary inorganic coating on the slurry by using titanium dioxide, and then carrying out secondary inorganic coating on the slurry subjected to primary inorganic coating by using aluminum oxide;
washing with water: washing the inorganic coated slurry with deionized water for 30-45 minutes;
spray drying: spray drying the slurry after washing to obtain titanium dioxide particles, wherein the drying temperature is 320-420 ℃, the nozzle pressure is 1.2-1.5 MPa, and the spraying speed is 25000-30000 r/min;
organic coating: carrying out organic coating on the titanium dioxide particles by using a composite organic coating agent;
airflow crushing: under the atmosphere of nitrogen, under the environment that the air pressure is 0.8-1.3 MPa and the temperature is 320-350 ℃, carrying out airflow crushing on the titanium dioxide particles after organic coating to obtain titanium dioxide for plastics with the particle size of 0.15-0.3 mu m;
and (6) packaging.
According to the preparation method of titanium dioxide for plastics, provided by the embodiment, ilmenite powder is subjected to magnetic separation, and impurities in the ilmenite powder are strictly controlled, so that the color and luster degree of a finished product are ensured; the wetting dispersant is used for dispersing the slurry, so that the continuity, integrity and uniformity during subsequent coating are ensured; the inorganic coating is carried out by sequentially utilizing titanium dioxide and aluminum oxide, so that the inorganic coating layer is more uniform and compact; the composite organic coating agent is used for organic coating, so that secondary agglomeration is prevented, and the compatibility and temperature resistance of titanium dioxide in plastics are improved; the particle size of the titanium dioxide is 0.15-0.3 mu m through airflow pulverization, so that the titanium dioxide has a bluish-white hue. Solves the problem of how to improve the quality of the titanium dioxide for plastics.
Specifically, in the present example, as shown in fig. 2, the method for producing rutile titanium dioxide grit by the sulfuric acid process includes:
acid hydrolysis: adding titanium concentrate powder into sulfuric acid with the concentration of more than 75%, heating to 90-120 ℃ under the mixed atmosphere of hydrogen chloride, carbon monoxide and nitrogen, and stirring for 3-4 hours to obtain acidolysis solution;
and (3) precipitation: after the temperature of the acidolysis solution is reduced to 26-35 ℃, adding a flocculating agent into the acidolysis solution, stirring for 30-40 minutes, standing for more than 24 hours, and filtering to obtain a titanium solution;
vacuum crystallization: crystallizing the titanium solution in a vacuum environment, separating out ferrous sulfate heptahydrate, and separating the ferrous sulfate heptahydrate to obtain pure titanium solution;
concentration and hydrolysis: performing film evaporation on the pure titanium solution to enable the pure titanium solution to become a concentrated titanium solution with the concentration of 220 g/L; adding rutile type seed crystals into the concentrated titanium solution at the temperature of 130-155 ℃ and the pressure of 0.2-0.4 MPa, fully curing, and adjusting the pH value to be 6-8 to obtain metatitanic acid;
and (3) washing and bleaching: bleaching the metatitanic acid by using sulfuric acid and trivalent titanium to obtain bleached metatitanic acid;
washing salt with water: washing bleached metatitanic acid with deionized water, and adding potassium phosphate, potassium carbonate and phosphoric acid into the washed metatitanic acid to obtain a metatitanic acid solution after salt treatment;
and (3) calcining: and calcining the metatitanic acid solution subjected to salt treatment at 980-1330 ℃ to obtain rutile type titanium white coarse gravel.
Further, the flocculating agent comprises 20-35 wt% of polyacrylamide, 30-50 wt% of polyaluminium sulfate, 12-36 wt% of bamboo charcoal fiber, 14-22 wt% of polyferric sulfate and 3-8 wt% of acrylic acid.
Polyacrylamide is a common flocculant in the flocculation process of titanium dioxide, and can adsorb fine particles by adding polyaluminium sulfate, polyferric sulfate and acrylic acid, so that the purity of the titanium liquid after flocculation filtration is improved, wherein the polyaluminium sulfate and the polyferric sulfate can provide a large amount of complex ions and can strongly adsorb colloidal particles, and colloids are coagulated through adsorption, bridge frame and crosslinking action, and simultaneously physicochemical change is generated to neutralize the charges on the surfaces of the colloidal particles and suspended matters, so that the delta potential is reduced, the colloidal particles are changed from original repulsion to attraction, the stability of micelles is damaged, and the colloidal particles collide with each other, so that flocculent coagulation precipitation is formed, and the flocculant has high adsorption capacity; the addition of the bamboo charcoal fiber can lead the flocculate to be adsorbed on the bamboo charcoal fiber, thereby accelerating the sedimentation speed and improving the production efficiency.
In this embodiment, the beating dispersion method comprises:
adding the titanium dioxide powder into deionized water to prepare slurry, and stirring for 15-20 minutes at a stirring speed of 2000-2800 r/min;
adding hydroxide into the slurry to adjust the pH to 8-12; specifically, the hydroxide may be sodium hydroxide;
adding an alcamine compound, performing ultrasonic dispersion for 30-60 minutes, and performing sanding for 45-60 minutes by using a sand mill to disperse the average particle size of titanium dioxide powder in the slurry below 0.32 mu m, wherein the alcamine compound specifically comprises one or more of ethanolamine, triethanolamine, isopropanolamine and deuterated albuterol, and the concentration of the alcamine compound in the slurry after the alcamine compound is added is 0.05-0.3%.
Further, in a specific embodiment, the alcohol amine compound comprises 48-62% by weight of ethanolamine, 22-44% by weight of triethanolamine and 10-28% by weight of deuterated albuterol.
According to the pulping and dispersing method provided by the embodiment, the dispersion state of titanium dioxide particles in the slurry is optimized by controlling the pH value of the slurry and the added alcohol amine compound and other process parameters, so that the continuity, integrity and uniformity in the subsequent coating process are greatly improved.
In the embodiment, titanium dioxide particles in the slurry can be uniformly dispersed by ultrasonic dispersion; the sand mill can be selected from Germany sand mill with speed tolerance, and the particle size of the titanium dioxide powder after desert is controlled below 0.32 μm.
In this embodiment, the method of inorganic coating includes:
stirring the slurry at the speed of 20-60 r/min, heating the slurry to 42-53 ℃, adding titanium dioxide powder, and curing for 1-2 hours to form a titanium dioxide coating layer on the surface of titanium dioxide powder particles in the slurry;
keeping the stirring speed unchanged, heating the slurry to 65-75 ℃, adding nano alumina powder, adjusting the pH of the slurry to 8-10, curing for 2-3 hours to form a hydrated alumina coating layer on the surface of the titanium dioxide coating layer; wherein the addition amount of the nano alumina powder is 20 to 30 percent of the mass of the titanium dioxide powder in the slurry.
In the present embodiment, the added titanium dioxide powder is preferably rutile type titanium dioxide powder, and the particle diameter of the powder is in the range of 0.15 to 0.3 μm; preferably, titanium dioxide powder having a blue hue is selected. The titanium dioxide coating layer is formed on the surface of the titanium dioxide powder particles in the slurry through a coating process, so that pores and the like can be reduced, the surface condition of the titanium dioxide powder particles is improved, and the subsequent coating of other coating layers is facilitated.
The alumina coating layer can effectively improve the weather resistance of the titanium dioxide, and the formed alumina coating layer is uniform and compact by controlling parameters such as temperature, pH value, time and concentration of the coating process in the embodiment, so that the physical and chemical properties of the titanium dioxide are improved.
Further, in this embodiment, the method for organic encapsulation includes:
preparing a composite organic coating agent, wherein the composite organic coating agent comprises 28-66 wt% of composite organic silicon, 22-35 wt% of polystyrene, 18-21 wt% of sodium alginate, 12-25 wt% of polyethylene glycol and 6-10 wt% of triphenylamine;
stirring titanium dioxide particles at the speed of 30-80 r/min, heating the titanium dioxide particles to 80-95 ℃, adding the prepared organic coating agent, and curing for 1.5-3 hours to form an organic coating layer on the surface of the hydrated alumina coating layer; wherein the concentration of the organic coating agent is 0.1-0.5%, and each 1kg of titanium dioxide particles are matched with 200-800 ml of the organic coating agent.
The organic coating is carried out after the inorganic coating, so that the secondary condensation of titanium dioxide particles can be prevented, and the oleophylic property of the titanium dioxide can be improved, thereby ensuring the compatibility of the titanium dioxide and plastics. In addition, the organic coating agent used in the embodiment is a composite organic coating agent, and can effectively improve the temperature resistance of titanium dioxide, so that the titanium dioxide has better compatibility and more stable physicochemical properties in different types of plastics.
And in order to effectively prevent the titanium dioxide from generating secondary agglomeration and ensure that the generated titanium dioxide for plastics has better dispersing performance, in the embodiment, a surfactant is added during jet milling, wherein the addition amount of the surfactant is 5-12 g per kilogram of titanium dioxide particles. Specifically, the surfactant comprises one or more of a coupling agent, a higher fatty acid, an unsaturated organic acid and organic silicon; wherein the coupling agent comprises one or more of silane coupling agent, titanate coupling agent, aluminate coupling agent and phosphate coupling agent; the higher fatty acid comprises one or more of stearic acid, oleic acid, linoleic acid and ligninic acid; the unsaturated organic acid comprises one or more of acrylic acid, crotonic acid and maleic acid.
The embodiment also provides a preparation system of titanium dioxide for plastics, as shown in fig. 3, the preparation system comprises a rutile type titanium dioxide production line and a titanium dioxide production line for plastics; the rutile type titanium dioxide production line is used for producing rutile type titanium dioxide by utilizing a sulfate process titanium dioxide production process; the titanium dioxide production line for plastics is used for treating the titanium dioxide produced by the rutile type titanium dioxide production line to obtain the titanium dioxide for plastics.
According to the preparation system of the titanium dioxide for the plastics, the traditional rutile type titanium dioxide production line and the traditional titanium dioxide production line for the plastics are combined, and the adjustment of the process is combined, so that the particle size of the produced titanium dioxide for the plastics is within the range of 0.15-0.3 mu m, and the system has good dispersion performance, good flow performance and good heat resistance, and has a strong blue bottom phase.
Specifically, in the present embodiment, as shown in fig. 4, the rutile titanium dioxide production line includes a mill, a magnetic separator, an acidolysis tank, a settling tank, a vacuum crystallization device, a disk separator, a thin film evaporator, a hydrolysis tank, a filter press, a bleaching tank, a salt treatment tank, and a calcining kiln, which are arranged in this order; the mill is used for grinding the ilmenite sand to obtain ilmenite sand powder; the magnetic separator is used for carrying out magnetic separation on the ilmenite powder to obtain titanium concentrate powder; the acidolysis tank is used for carrying out acidolysis on the titanium concentrate powder to obtain acidolysis solution; the settling tank is used for settling and filtering the acidolysis solution to obtain a titanium solution; the vacuum crystallization equipment is used for carrying out vacuum crystallization on the titanium liquid; the disc separator is used for separating the product after vacuum crystallization to obtain ferrous sulfate heptahydrate and pure titanium liquid; the film evaporator is used for concentrating the pure titanium liquid to obtain a concentrated titanium liquid; the hydrolysis tank is used for hydrolyzing the concentrated titanium liquid to obtain metatitanic acid; the filter press is used for washing metatitanic acid with water; the bleaching tank is used for bleaching metatitanic acid to obtain bleached metatitanic acid; the salt treatment tank is used for carrying out salt treatment on metatitanic acid to obtain a metatitanic acid solution after the salt treatment; the calcining kiln is used for calcining the metatitanic acid solution to obtain rutile type titanium white coarse gravel.
And as shown in fig. 5, the production line of titanium dioxide for plastics comprises a ball mill pulverizer, a dispersion tank, an inorganic coating treatment tank, a ceramic membrane washing machine, a spray dryer, an organic coating treatment tank, an air flow pulverizer and an automatic packaging machine which are arranged in sequence; the ball-milling pulverizer is used for carrying out ball-milling pulverization on the rutile type titanium white coarse gravel to obtain titanium white powder; the dispersing tank is used for pulping and dispersing the titanium dioxide powder to prepare slurry; the inorganic coating treatment tank is used for performing inorganic coating and water washing on the slurry; the ceramic membrane washing machine is used for washing the slurry by using a ceramic membrane; the spray dryer is used for spray drying the slurry to obtain titanium dioxide particles; the organic coating treatment tank is used for carrying out organic coating on titanium dioxide particles; the jet mill is used for jet milling the titanium dioxide particles coated with the organic coating to obtain titanium dioxide for plastics; the automatic packaging machine is used for automatically packaging the titanium dioxide for the plastic.
It should be noted that, in the practical application process, the design of the production line can be adjusted and separated according to the practical process, for example, in the inorganic coating treatment tank and the organic coating treatment tank, a filter press should be further present for water washing, and for example, an automatic monitoring device added to the equipment, etc. is provided. The addition of other devices without departing from the spirit of the present invention should also fall within the scope of the present invention.
The following describes the performance of the titanium dioxide for plastics prepared by the method and system for preparing titanium dioxide for plastics according to the present invention with a specific example.
First, rutile titanium white grit was produced by a sulfuric acid process using a rutile titanium dioxide production line, comprising:
crushing and magnetic separation: drying and crushing ilmenite under vacuum to form ilmenite powder with the particle size of not more than 0.3 mm; carrying out magnetic separation on the ilmenite powder to obtain titanium concentrate powder;
acid hydrolysis: adding titanium concentrate powder into sulfuric acid with the concentration of more than 75%, heating to 100 +/-10 ℃ under the mixed atmosphere of hydrogen chloride, carbon monoxide and nitrogen, and stirring for 3-4 hours to obtain acidolysis solution;
and (3) precipitation: after the temperature of the acidolysis solution is reduced to 30 +/-3 ℃, adding a flocculating agent into the acidolysis solution, stirring for 30-40 minutes, standing for 24 hours, and filtering to obtain a titanium solution; wherein, the flocculating agent comprises 20 percent of polyacrylamide, 35 percent of polyaluminium sulfate, 15 percent of bamboo charcoal fiber, 25 percent of polyferric sulfate and 5 percent of acrylic acid.
Vacuum crystallization: crystallizing the titanium solution in a vacuum environment, separating out ferrous sulfate heptahydrate, and separating the ferrous sulfate heptahydrate to obtain pure titanium solution;
concentration and hydrolysis: performing film evaporation on the pure titanium solution to enable the pure titanium solution to become a concentrated titanium solution with the concentration of 220 g/L; adding rutile type seed crystals into the concentrated titanium solution at the temperature of 140 +/-10 ℃ and the pressure of 0.3 +/-0.05 MPa, fully curing, and adjusting the pH value to be within the range of 6-8 to obtain metatitanic acid;
and (3) washing and bleaching: bleaching the metatitanic acid by using sulfuric acid and trivalent titanium to obtain bleached metatitanic acid;
washing salt with water: washing bleached metatitanic acid with deionized water, and adding potassium phosphate, potassium carbonate and phosphoric acid into the washed metatitanic acid to obtain a metatitanic acid solution after salt treatment;
and (3) calcining: calcining the metatitanic acid solution subjected to salt treatment at 1000-1200 ℃ to obtain rutile type titanium white coarse gravel.
Then, the production and packaging of the titanium dioxide for plastics are carried out by utilizing a titanium dioxide production line for plastics, which specifically comprises the following steps:
grinding and crushing: grinding the rutile type titanium white coarse gravel to obtain titanium white powder with the particle size not greater than 20 mu m; specifically, a ball mill pulverizer can be selected for grinding and pulverizing;
pulping and dispersing: adding the titanium white powder into deionized water to prepare slurry, and stirring for 15-20 minutes at the stirring speed of 2500 +/-200 r/min; then, adding sodium hydroxide into the slurry to adjust the pH value to 8-12; then adding an alcohol amine compound, wherein the concentration of the alcohol amine compound in the slurry after the alcohol amine compound is added is 0.05-0.3%; then, ultrasonically dispersing for 45 +/-5 minutes, and sanding for 50 +/-5 minutes by using a sand mill so as to disperse the average grain diameter of the titanium dioxide powder in the slurry below 0.32 mu m; wherein, the alcamines compounds comprise 50 percent of ethanolamine, 35 percent of triethanolamine and 15 percent of deuterated albuterol.
Inorganic coating: firstly, stirring slurry at the speed of 40 +/-5 r/min, heating the slurry to 45-50 ℃, adding titanium dioxide powder, and curing for 1-2 hours to form a titanium dioxide coating layer on the surfaces of titanium dioxide powder particles in the slurry; keeping the stirring speed unchanged, heating the slurry to 70 +/-3 ℃, adding nano alumina powder, adjusting the pH of the slurry to 8-10, and curing for 2-3 hours to form a hydrated alumina coating layer on the surface of the titanium dioxide coating layer; wherein the addition amount of the nano alumina powder is 20 to 30 percent of the mass of the titanium dioxide powder in the slurry;
washing with water: washing the inorganic coated slurry with deionized water for 30-45 minutes;
spray drying: spray drying the slurry after water washing to obtain titanium dioxide particles, wherein the drying temperature is 380 +/-10 ℃, the nozzle pressure is 1.4 +/-0.05 MPa, and the spraying speed is 28000 +/-1000 r/min;
organic coating: firstly, preparing a composite organic coating agent, wherein the composite organic coating agent comprises 30% by weight of composite organic silicon, 25% by weight of polystyrene, 20% by weight of sodium alginate, 15% by weight of polyethylene glycol and 10% by weight of triphenylamine; then, stirring the titanium dioxide particles at a speed of 60 +/-5 r/min, and heating the titanium dioxide particles to 80-95 ℃; then, adding the prepared organic coating agent, wherein the concentration of the organic coating agent is 0.1-0.5%, and each 1kg of titanium dioxide particles are matched with 600 +/-50 ml of the organic coating agent; then, curing for 2-3 hours to form an organic coating layer on the surface of the hydrated alumina coating layer;
airflow crushing: in the nitrogen atmosphere, under the environment that the air pressure is 1.0 +/-0.05 MPa and the temperature is 335 +/-5 ℃, carrying out airflow crushing on the titanium white particles, and simultaneously adding a surfactant, wherein the addition amount of the surfactant is 5-12 g of the surfactant added into each kilogram of the titanium white particles, so as to obtain titanium dioxide for plastics with the particle size of 0.15-0.3 mu m; wherein the surfactant is a mixture of a silane coupling agent and a titanate coupling agent;
and (6) packaging.
Therefore, the titanium dioxide for plastics provided by the embodiment is automatically produced in the production process of the rutile type titanium white coarse gravel and the titanium dioxide for plastics, so that the manpower is saved, the manufacturing efficiency is improved, and the safety and health of personnel are ensured.
Finally, the plastics thus produced were characterized by titanium dioxide, the results of which are given in the following table:
| item | Index (I) | Examination of analytical results |
| Luminance (%) | ≥95 | 96.2 |
| PH | 6～9 | 8.4 |
| TCX | ≥1900 | 2000 |
| Black lattice number | ≥6.5 | 7.0 |
| Oil absorption | ≤18 | 17 |
| Temperature resistance | / | Does not change color at 350 ℃ for 30min |
As can be seen from the above table, the titanium dioxide for plastics provided in this embodiment has good brightness, weak alkaline PH, strong blue base phase and hiding power, good dispersibility in an oily medium, and high temperature resistance, and thus can be applied to plastics.
In summary, the method and system for preparing titanium dioxide for plastics provided by this embodiment include: crushing and magnetic separation: drying and crushing ilmenite under vacuum to form ilmenite powder with the particle size of not more than 0.3 mm; carrying out magnetic separation on the ilmenite powder to obtain titanium concentrate powder; preparing rutile type titanium white coarse gravel by a sulfuric acid method; grinding and crushing: grinding the rutile type titanium white coarse gravel to obtain titanium white powder with the particle size not greater than 20 mu m; pulping and dispersing: adding the titanium dioxide powder and a wetting dispersant into deionized water, stirring and adjusting the pH of the solution to 8-12 to prepare slurry; wherein the wetting and dispersing agent comprises hydroxide and an alcohol amine compound; inorganic coating: firstly, carrying out primary inorganic coating on the slurry by using titanium dioxide, and then carrying out secondary inorganic coating on the slurry subjected to primary inorganic coating by using aluminum oxide; washing with water: washing the inorganic coated slurry with deionized water for 30-45 minutes; spray drying: spray drying the slurry after the secondary water washing to obtain titanium dioxide particles, wherein the drying temperature is 320-420 ℃, the nozzle pressure is 1.2-1.5 MPa, and the spraying speed is 25000-30000 r/min; organic coating: carrying out organic coating on the titanium dioxide particles by using a composite organic coating agent; airflow crushing: under the atmosphere of nitrogen, under the environment that the air pressure is 0.8-1.3 MPa and the temperature is 320-350 ℃, carrying out airflow crushing on the titanium dioxide particles after organic coating to obtain titanium dioxide for plastics with the particle size of 0.15-0.3 mu m; and (6) packaging. The ferrotitanium placer powder is magnetically separated, and impurities in the ferrotitanium placer powder are strictly controlled, so that the color and luster degree of a finished product are ensured; the wetting dispersant is used for dispersing the slurry, so that the continuity, integrity and uniformity during subsequent coating are ensured; the inorganic coating is carried out by sequentially utilizing titanium dioxide and aluminum oxide, so that the inorganic coating layer is more uniform and compact; the composite organic coating agent is used for organic coating, so that secondary agglomeration is prevented, and the compatibility and temperature resistance of titanium dioxide in plastics are improved; the particle size of the titanium dioxide is 0.15-0.3 mu m through airflow pulverization, so that the titanium dioxide has a bluish-white hue. Solves the problem of how to improve the quality of the titanium dioxide for plastics.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (14)
1. A preparation method of titanium dioxide for plastics is characterized by comprising the following steps:
crushing and magnetic separation: drying and crushing ilmenite under vacuum to form ilmenite powder with the particle size of not more than 0.3 mm; carrying out magnetic separation on the ilmenite powder to obtain titanium concentrate powder;
preparing rutile type titanium white coarse gravel by a sulfuric acid method;
grinding and crushing: grinding the rutile type titanium white coarse gravel to obtain titanium white powder with the particle size not greater than 20 mu m;
pulping and dispersing: adding the titanium dioxide powder and a wetting dispersant into deionized water, stirring and adjusting the pH of the solution to 8-12 to prepare slurry; wherein the wetting and dispersing agent comprises hydroxide and an alcohol amine compound;
inorganic coating: firstly, carrying out primary inorganic coating on the slurry by using titanium dioxide, and then carrying out secondary inorganic coating on the slurry subjected to primary inorganic coating by using aluminum oxide;
washing with water: washing the inorganic coated slurry with deionized water for 30-45 minutes;
spray drying: spray drying the slurry after washing to obtain titanium dioxide particles, wherein the drying temperature is 320-420 ℃, the nozzle pressure is 1.2-1.5 MPa, and the spraying speed is 25000-30000 r/min;
organic coating: carrying out organic coating on the titanium dioxide particles by using a composite organic coating agent;
airflow crushing: under the atmosphere of nitrogen, under the environment that the air pressure is 0.8-1.3 MPa and the temperature is 320-350 ℃, carrying out airflow crushing on the titanium dioxide particles after organic coating to obtain titanium dioxide for plastics with the particle size of 0.15-0.3 mu m;
and (6) packaging.
2. The method of producing titanium dioxide for plastics according to claim 1, wherein the method of producing rutile titanium dioxide grit by the sulfuric acid process comprises:
acid hydrolysis: adding titanium concentrate powder into sulfuric acid with the concentration of more than 75%, heating to 90-120 ℃ under the mixed atmosphere of hydrogen chloride, carbon monoxide and nitrogen, and stirring for 3-4 hours to obtain acidolysis solution;
and (3) precipitation: after the temperature of the acidolysis solution is reduced to 26-35 ℃, adding a flocculating agent into the acidolysis solution, stirring for 30-40 minutes, standing for more than 24 hours, and filtering to obtain a titanium solution;
vacuum crystallization: crystallizing the titanium solution in a vacuum environment, separating out ferrous sulfate heptahydrate, and separating the ferrous sulfate heptahydrate to obtain pure titanium solution;
concentration and hydrolysis: performing film evaporation on the pure titanium solution to enable the pure titanium solution to become a concentrated titanium solution with the concentration of 220 g/L; adding rutile type seed crystals into the concentrated titanium solution at the temperature of 130-155 ℃ and the pressure of 0.2-0.4 MPa, fully curing, and adjusting the pH value to be 6-8 to obtain metatitanic acid;
and (3) washing and bleaching: bleaching the metatitanic acid by using sulfuric acid and trivalent titanium to obtain bleached metatitanic acid;
washing salt with water: washing bleached metatitanic acid with deionized water, and adding potassium phosphate, potassium carbonate and phosphoric acid into the washed metatitanic acid to obtain a metatitanic acid solution after salt treatment;
and (3) calcining: and calcining the metatitanic acid solution subjected to salt treatment at 980-1330 ℃ to obtain rutile type titanium white coarse gravel.
3. The method for preparing titanium dioxide for plastics according to claim 2, wherein the flocculating agent comprises 20-35% by weight of polyacrylamide, 30-50% by weight of polyaluminium sulfate, 12-36% by weight of bamboo charcoal fiber, 14-22% by weight of polyferric sulfate and 3-8% by weight of acrylic acid.
4. The method for preparing titanium dioxide for plastics according to claim 1, wherein the beating dispersion method comprises:
adding the titanium dioxide powder into deionized water to prepare slurry, and stirring for 15-20 minutes at a stirring speed of 2000-2800 r/min;
adding hydroxide into the slurry to adjust the pH to 8-12;
adding an alcamine compound, performing ultrasonic dispersion for 30-60 minutes, and then performing sanding for 45-60 minutes by using a sand mill so as to disperse the average particle size of the titanium dioxide powder in the slurry below 0.32 mu m.
5. The method for producing titanium dioxide for plastics according to claim 4, wherein the hydroxide is sodium hydroxide; the alcamines compounds comprise one or more of ethanolamine, triethanolamine, isopropanolamine and deuterated albuterol.
6. The method for preparing titanium dioxide for plastics according to claim 5, wherein the alcohol amine compound comprises 48-62% by weight of ethanolamine, 22-44% by weight of triethanolamine and 10-28% by weight of deuterated salbutamol amine.
7. The method for producing titanium dioxide for plastics according to claim 4, wherein the concentration of the alkanolamine compound in the slurry after the addition of the alkanolamine compound is 0.05% to 0.3%.
8. The method of preparing titanium dioxide for plastics according to claim 1, wherein the method of coating an inorganic film comprises:
stirring the slurry at the speed of 20-60 r/min, heating the slurry to 42-53 ℃, adding titanium dioxide powder, and curing for 1-2 hours to form a titanium dioxide coating layer on the surface of titanium dioxide powder particles in the slurry;
keeping the stirring speed unchanged, heating the slurry to 65-75 ℃, adding nano alumina powder, adjusting the pH of the slurry to 8-10, curing for 2-3 hours to form a hydrated alumina coating layer on the surface of the titanium dioxide coating layer; wherein the addition amount of the nano alumina powder is 20 to 30 percent of the mass of the titanium dioxide powder in the slurry.
9. The preparation method of titanium dioxide for plastics according to claim 1, wherein the composite organic coating agent comprises 28-66 wt% of composite organic silicon, 22-35 wt% of polystyrene, 18-21 wt% of sodium alginate, 12-25 wt% of polyethylene glycol and 6-10 wt% of triphenylamine.
10. The method of preparing titanium dioxide for plastics according to claim 9, wherein the method of coating with an organic film comprises:
preparing a composite organic coating agent;
stirring titanium dioxide particles at the speed of 30-80 r/min, heating the titanium dioxide particles to 80-95 ℃, adding the prepared organic coating agent, and curing for 1.5-3 hours to form an organic coating layer on the surface of the hydrated alumina coating layer; wherein the concentration of the organic coating agent is 0.1-0.5%, and each 1kg of titanium dioxide particles are matched with 200-800 ml of the organic coating agent.
11. The method for preparing titanium dioxide for plastics according to claim 1, wherein a surfactant is added during jet milling, wherein the amount of the surfactant added is 5-12 g per kg of the titanium dioxide particles.
12. The method of producing titanium dioxide for plastics according to claim 11, wherein the surfactant comprises one or more of a coupling agent, a higher fatty acid, an unsaturated organic acid and a silicone; wherein the coupling agent comprises one or more of silane coupling agent, titanate coupling agent, aluminate coupling agent and phosphate coupling agent; the higher fatty acid comprises one or more of stearic acid, oleic acid, linoleic acid and ligninic acid; the unsaturated organic acid comprises one or more of acrylic acid, crotonic acid and maleic acid.
13. A production system of titanium dioxide for plastics, for performing the production method of titanium dioxide for plastics according to any one of claims 1 to 12, characterized by comprising a rutile-type titanium dioxide production line and a titanium dioxide production line for plastics; the rutile type titanium dioxide production line is used for producing rutile type titanium dioxide by utilizing a sulfate process titanium dioxide production process; the titanium dioxide production line for plastics is used for treating the titanium dioxide produced by the rutile type titanium dioxide production line to obtain the titanium dioxide for plastics.
14. The system for preparing titanium dioxide for plastics according to claim 13, wherein the production line for titanium dioxide for plastics comprises a ball mill pulverizer, a dispersion tank, an inorganic coating treatment tank, a ceramic membrane washer, a spray dryer, an organic coating treatment tank, a jet mill and an automatic packaging machine, which are arranged in this order; the ball-milling pulverizer is used for carrying out ball-milling pulverization on the rutile type titanium white coarse gravel to obtain titanium white powder; the dispersing tank is used for pulping and dispersing the titanium dioxide powder to prepare slurry; the inorganic coating treatment tank is used for performing inorganic coating and water washing on the slurry; the ceramic membrane washing machine is used for washing the slurry by using a ceramic membrane; the spray dryer is used for spray drying the slurry to obtain titanium dioxide particles; the organic coating treatment tank is used for carrying out organic coating on titanium dioxide particles; the jet mill is used for jet milling the titanium dioxide particles coated with the organic coating to obtain titanium dioxide for plastics; the automatic packaging machine is used for automatically packaging the titanium dioxide for the plastic.
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