CN112079381A - Method for producing special rutile type titanium dioxide of powder coating - Google Patents
Method for producing special rutile type titanium dioxide of powder coating Download PDFInfo
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- CN112079381A CN112079381A CN202010921929.3A CN202010921929A CN112079381A CN 112079381 A CN112079381 A CN 112079381A CN 202010921929 A CN202010921929 A CN 202010921929A CN 112079381 A CN112079381 A CN 112079381A
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 34
- 239000000843 powder Substances 0.000 title claims abstract description 26
- 238000000576 coating method Methods 0.000 title claims abstract description 19
- 239000011248 coating agent Substances 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 41
- 238000005406 washing Methods 0.000 claims abstract description 35
- 239000002253 acid Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000001354 calcination Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 150000003839 salts Chemical class 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000001704 evaporation Methods 0.000 claims abstract description 9
- 230000008020 evaporation Effects 0.000 claims abstract description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000004061 bleaching Methods 0.000 claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000004062 sedimentation Methods 0.000 claims abstract description 8
- 239000010936 titanium Substances 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000004537 pulping Methods 0.000 claims abstract description 7
- 239000006228 supernatant Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- 239000002270 dispersing agent Substances 0.000 claims description 8
- 230000003301 hydrolyzing effect Effects 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- WTDHULULXKLSOZ-UHFFFAOYSA-N Hydroxylamine hydrochloride Chemical compound Cl.ON WTDHULULXKLSOZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- 239000004202 carbamide Substances 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 2
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical group [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 2
- 235000010265 sodium sulphite Nutrition 0.000 claims description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 7
- 239000000047 product Substances 0.000 abstract description 5
- 230000018044 dehydration Effects 0.000 abstract description 3
- 238000006297 dehydration reaction Methods 0.000 abstract description 3
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 230000007062 hydrolysis Effects 0.000 abstract description 2
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 2
- 239000013049 sediment Substances 0.000 abstract 1
- 235000010215 titanium dioxide Nutrition 0.000 description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005660 chlorination reaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910000349 titanium oxysulfate Inorganic materials 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
Classifications
-
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- 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
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- 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
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
- C01P2006/62—L* (lightness axis)
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
A method for producing special rutile type titanium dioxide of powder coating comprises the following steps: (1) mixing industrial titanium liquid and water for hydrolysis; carrying out centrifugal sedimentation to remove supernatant, washing the sediment by dilute acid after conventional bleaching, and washing to obtain washing metatitanic acid; (2) adding a seed crystal promoter after pulping the washed metatitanic acid to preheat to obtain pretreated slurry; (3) adding a salt treating agent into the pretreated slurry, performing filter pressing and flash evaporation drying, inputting the pretreated slurry into a primary rotary kiln, deeply dehydrating the pretreated slurry, and then sending the dehydrated slurry into a secondary rotary kiln, wherein the temperature of the feeding end of the rotary kiln is controlled to be 600 ℃ plus materials, then the temperature of the materials is increased to be 800 ℃ plus materials, and the temperature is kept for 2-3 h; finally, the temperature is raised to 800 ℃ and 950 ℃, and the temperature is kept for 1.5 to 3 hours, thereby completing the calcination process; according to the invention, through flash evaporation drying dehydration and one-time deep dehydration of the rotary kiln, the metatitanic acid can be uniformly dehydrated before calcination, high-temperature agglomeration of titanium dioxide in the calcination process is avoided, the whiteness and light resistance of the product are ensured, and the calcination recovery rate of the rotary kiln is improved.
Description
Technical Field
The invention belongs to the field of titanium dioxide production, and particularly relates to a method for producing special rutile titanium dioxide for powder coating.
Background
With the continuous development of the economy of China, the demand on titanium dioxide is continuously increased, the capacity of the titanium dioxide in China accounts for about 30 percent of the world, is the largest titanium dioxide producing country in the world, is also the largest titanium dioxide consuming country in the world, and runs away from the world titanium dioxide industry with absolute advantages; the industrial production method of titanium dioxide mainly includes sulfuric acid process and chlorination process. At present, 56 percent of the total titanium white production in the world is chlorination products, more than 70 percent of the products are produced in the United states, and most titanium white factories in other countries still adopt a sulfuric acid method; the main raw materials for producing titanium dioxide by a sulfuric acid method are ilmenite and sulfuric acid, and the main process steps are as follows: titanic iron ore and sulfuric acid are hydrolyzed to obtain titanyl sulfate, and metatitanic acid is generated through sedimentation, crystallization and hydrolysis; metatitanic acid is subjected to primary washing, bleaching, secondary washing, salt treatment and calcination to obtain a rutile titanium dioxide substrate; and wet grinding, sanding, coating and air powder are carried out on the titanium dioxide base material to obtain the titanium dioxide product.
The powder coating is a novel 100 percent solid powder coating without solvent, and the currently used powder coating is prepared by mixing special resin, pigment, filler, curing agent and other auxiliary agents according to a certain proportion, and then carrying out processes such as extrusion, crushing and the like; the properties of titanium dioxide, as an important component in powder coatings, determine to a large extent the properties of the finished powder coating.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for producing special rutile titanium dioxide for powder coating, which is characterized by comprising the following steps:
(1) mixing industrial titanium liquid and water in a volume ratio of 1:4-6, and hydrolyzing at 90-110 ℃ under a reflux condition for 3-6 h; then carrying out centrifugal sedimentation to remove supernatant, washing the precipitate by dilute acid after conventional bleaching, washing for 3-5 times, and washing until the pH value is 6-7 to obtain washing metatitanic acid;
(2) adding a dispersing agent into the metatitanic acid washing, pulping to prepare slurry with titanium dioxide concentration of 350-450g/l, adding a seed crystal promoter, and preheating to fully dissolve to obtain pretreated slurry;
(3) adding a salt treating agent into the pretreated slurry, performing filter pressing and flash evaporation drying, inputting the pretreated slurry into a primary rotary kiln, deeply dehydrating the pretreated slurry, and then sending the dehydrated slurry into a secondary rotary kiln, wherein the temperature of the feeding end of the rotary kiln is controlled to be 600 ℃ plus materials, then the temperature of the materials is increased to be 800 ℃ plus materials, and the temperature is kept for 2-3 h; finally, the temperature is raised to 800 ℃ and 950 ℃, and the temperature is kept for 1.5 to 3 hours, thereby completing the calcination process.
Preferably, in the step (1), the dilute acid is dilute sulfuric acid with a mass concentration of 10-20%.
Preferably, the salt treatment agent comprises Al2(SO4)3、K2CO3、H3PO4；Al2(SO4)3In an amount of Al2O3Calculated as 0.2-0.4%, K2CO3In an amount of K20.2-0.4% of O, H3PO4In an amount of P2O5Calculated as 0.1-0.4%.
Preferably, in the step (2), the dispersant is sodium polyacrylate or sodium hexametaphosphate.
Preferably, the seed accelerator is urea.
Preferably, the diluted acid contains a reducing agent, and the reducing agent is at least one of sodium sulfite, sodium bisulfite and hydroxylamine hydrochloride.
Compared with the prior art, the invention has the advantages that: firstly, acid cleaning is carried out before metatitanic acid is calcined, so that iron and sulfur components contained in the industrial titanium liquid are removed, and the quality of titanium dioxide is improved; in addition, the metatitanic acid is dehydrated by flash evaporation drying and deep dehydration of a rotary kiln before calcination, so that the metatitanic acid is uniformly dehydrated before calcination, high-temperature agglomeration of titanium dioxide in the calcination process is avoided, the whiteness and the light resistance of the product are ensured, the calcination recovery rate of the rotary kiln is improved, and the recovery rate is as high as 99.2%.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.
Example 1
A method for producing special rutile type titanium dioxide of powder coating is characterized by comprising the following steps:
(1) mixing industrial titanium liquid and water in a volume ratio of 1:4-6, and hydrolyzing at 90-110 ℃ under a reflux condition for 3-6 h; then carrying out centrifugal sedimentation to remove supernatant, washing the precipitate by dilute acid after conventional bleaching, washing for 3-5 times, and washing until the pH value is 6-7 to obtain washing metatitanic acid;
(2) adding a dispersing agent into the metatitanic acid washing, pulping to prepare slurry with titanium dioxide concentration of 350-450g/l, adding a seed crystal promoter, and preheating to fully dissolve to obtain pretreated slurry;
(3) adding a salt treating agent into the pretreated slurry, performing filter pressing and flash evaporation drying, inputting the pretreated slurry into a primary rotary kiln, deeply dehydrating the pretreated slurry, and then sending the dehydrated slurry into a secondary rotary kiln, wherein the temperature of the feeding end of the rotary kiln is controlled to be 600 ℃ plus materials, then the temperature of the materials is increased to be 800 ℃ plus materials, and the temperature is kept for 2-3 h; finally, the temperature is raised to 800 ℃ and 950 ℃, the temperature is kept for 1.5 to 3 hours, the calcination process is completed, and the calcination recovery rate is 98.7 percent.
The titanium dioxide powder had a whiteness value W of 72.3, an L value of 96.5, an achromatism of 104% and a dispersibility of 82%.
Example 2
A method for producing special rutile type titanium dioxide of powder coating is characterized by comprising the following steps:
(1) mixing industrial titanium liquid and water in a volume ratio of 1:4-6, and hydrolyzing at 90-110 ℃ under a reflux condition for 3-6 h; then carrying out centrifugal sedimentation to remove supernatant, washing the precipitate by dilute acid after conventional bleaching, washing for 3-5 times, and washing until the pH value is 6-7 to obtain washing metatitanic acid;
(2) adding a dispersing agent into the metatitanic acid washing, pulping to prepare slurry with titanium dioxide concentration of 350-450g/l, adding a seed crystal promoter, and preheating to fully dissolve to obtain pretreated slurry;
(3) adding a salt treating agent into the pretreated slurry, performing filter pressing and flash evaporation drying, inputting the pretreated slurry into a primary rotary kiln, deeply dehydrating the pretreated slurry, and then sending the dehydrated slurry into a secondary rotary kiln, wherein the temperature of the feeding end of the rotary kiln is controlled to be 600 ℃ plus materials, then the temperature of the materials is increased to be 800 ℃ plus materials, and the temperature is kept for 2-3 h; finally, the temperature is raised to 800 ℃ and 950 ℃, the temperature is kept for 1.5 to 3 hours, the calcination process is completed, and the calcination recovery rate is 97.1 percent.
The titanium dioxide powder had a whiteness value W of 73.4, an L value of 95.3, an achromatism of 106% and a dispersibility of 79%.
Example 3
A method for producing special rutile type titanium dioxide of powder coating is characterized by comprising the following steps:
(1) mixing industrial titanium liquid and water in a volume ratio of 1:4-6, and hydrolyzing at 90-110 ℃ under a reflux condition for 3-6 h; then carrying out centrifugal sedimentation to remove supernatant, washing the precipitate by dilute acid after conventional bleaching, washing for 3-5 times, and washing until the pH value is 6-7 to obtain washing metatitanic acid;
(2) adding a dispersing agent into the metatitanic acid washing, pulping to prepare slurry with titanium dioxide concentration of 350-450g/l, adding a seed crystal promoter, and preheating to fully dissolve to obtain pretreated slurry;
(3) adding a salt treating agent into the pretreated slurry, performing filter pressing and flash evaporation drying, inputting the pretreated slurry into a primary rotary kiln, deeply dehydrating the pretreated slurry, and then sending the dehydrated slurry into a secondary rotary kiln, wherein the temperature of the feeding end of the rotary kiln is controlled to be 600 ℃ plus materials, then the temperature of the materials is increased to be 800 ℃ plus materials, and the temperature is kept for 2-3 h; finally, the temperature is raised to 800 ℃ and 950 ℃, the temperature is kept for 1.5 to 3 hours, the calcination process is completed, and the calcination recovery rate is 99.2 percent.
The titanium dioxide powder had a whiteness value W of 69.8, an L value of 97.2, an achromatism of 106% and a dispersibility of 84%.
Example 4
A method for producing special rutile type titanium dioxide of powder coating is characterized by comprising the following steps:
(1) mixing industrial titanium liquid and water in a volume ratio of 1:4-6, and hydrolyzing at 90-110 ℃ under a reflux condition for 3-6 h; then carrying out centrifugal sedimentation to remove supernatant, washing the precipitate by dilute acid after conventional bleaching, washing for 3-5 times, and washing until the pH value is 6-7 to obtain washing metatitanic acid;
(2) adding a dispersing agent into the metatitanic acid washing, pulping to prepare slurry with titanium dioxide concentration of 350-450g/l, adding a seed crystal promoter, and preheating to fully dissolve to obtain pretreated slurry;
(3) adding a salt treating agent into the pretreated slurry, performing filter pressing and flash evaporation drying, inputting the pretreated slurry into a primary rotary kiln, deeply dehydrating the pretreated slurry, and then sending the dehydrated slurry into a secondary rotary kiln, wherein the temperature of the feeding end of the rotary kiln is controlled to be 600 ℃ plus materials, then the temperature of the materials is increased to be 800 ℃ plus materials, and the temperature is kept for 2-3 h; finally, the temperature is raised to 800 ℃ and 950 ℃, the temperature is kept for 1.5 to 3 hours, the calcination process is completed, and the calcination recovery rate is 98.5 percent.
The titanium dioxide powder had a whiteness value W of 69.2, an L value of 96.2, an achromatism of 106% and a dispersibility of 78%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for producing special rutile type titanium dioxide of powder coating is characterized by comprising the following steps:
(1) mixing industrial titanium liquid and water in a volume ratio of 1:4-6, and hydrolyzing at 90-110 ℃ under a reflux condition for 3-6 h; then carrying out centrifugal sedimentation to remove supernatant, washing the precipitate by dilute acid after conventional bleaching, washing for 3-5 times, and washing until the pH value is 6-7 to obtain washing metatitanic acid;
(2) adding a dispersing agent into the metatitanic acid washing, pulping to prepare slurry with titanium dioxide concentration of 350-450g/l, adding a seed crystal promoter, and preheating to fully dissolve to obtain pretreated slurry;
(3) adding a salt treating agent into the pretreated slurry, performing filter pressing and flash evaporation drying, inputting the pretreated slurry into a primary rotary kiln, deeply dehydrating the pretreated slurry, and then sending the dehydrated slurry into a secondary rotary kiln, wherein the temperature of the feeding end of the rotary kiln is controlled to be 600 ℃ plus materials, then the temperature of the materials is increased to be 800 ℃ plus materials, and the temperature is kept for 2-3 h; finally, the temperature is raised to 800 ℃ and 950 ℃, and the temperature is kept for 1.5 to 3 hours, thereby completing the calcination process.
2. The method for producing rutile titanium dioxide powder dedicated for powder coating of claim 1, wherein in step (1), the dilute acid is dilute sulfuric acid with a mass concentration of 10-20%.
3. The method of claim 1, wherein the salt treatment agent comprises Al2(SO4)3、K2CO3、H3PO4；Al2(SO4)3In an amount of Al2O3Calculated as 0.2-0.4%, K2CO3In an amount of K20.2-0.4% of O, H3PO4In an amount of P2O5Calculated as 0.1-0.4%.
4. The method for producing rutile type titanium dioxide powder dedicated for powder coating as claimed in claim 1, wherein in step (2), the dispersant is sodium polyacrylate or sodium hexametaphosphate.
5. The method for producing rutile type titanium dioxide powder dedicated for powder coating as claimed in claim 1, wherein the seed crystal promoter is urea.
6. The method of claim 1, wherein the dilute acid solution contains a reducing agent, and the reducing agent is at least one of sodium sulfite, sodium bisulfite and hydroxylamine hydrochloride.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113428895A (en) * | 2021-08-06 | 2021-09-24 | 龙佰四川钛业有限公司 | Calcining method of metatitanic acid by sulfuric acid process |
| CN113582228A (en) * | 2021-08-13 | 2021-11-02 | 广东惠云钛业股份有限公司 | Preparation method and application of high-whiteness titanium dioxide |
| CN113912110A (en) * | 2021-10-27 | 2022-01-11 | 龙佰禄丰钛业有限公司 | Method for recovering titanium dioxide and hydrochloric acid from titanium tetrachloride tail gas absorption liquid |
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