CN115260795B - Method for reducing agglomerated particles in titanium dioxide product - Google Patents
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- CN115260795B CN115260795B CN202211034307.4A CN202211034307A CN115260795B CN 115260795 B CN115260795 B CN 115260795B CN 202211034307 A CN202211034307 A CN 202211034307A CN 115260795 B CN115260795 B CN 115260795B
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 434
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 217
- 239000002245 particle Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000047 product Substances 0.000 claims abstract description 59
- 239000002002 slurry Substances 0.000 claims abstract description 57
- 238000001035 drying Methods 0.000 claims abstract description 44
- 238000005406 washing Methods 0.000 claims abstract description 41
- 239000012065 filter cake Substances 0.000 claims abstract description 37
- 238000010902 jet-milling Methods 0.000 claims abstract description 34
- 230000005484 gravity Effects 0.000 claims abstract description 33
- 238000004062 sedimentation Methods 0.000 claims abstract description 33
- 230000018044 dehydration Effects 0.000 claims abstract description 14
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 14
- 238000009288 screen filtration Methods 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 46
- 238000000576 coating method Methods 0.000 claims description 46
- 239000001038 titanium pigment Substances 0.000 claims description 15
- 238000004806 packaging method and process Methods 0.000 claims description 11
- DNXNYEBMOSARMM-UHFFFAOYSA-N alumane;zirconium Chemical group [AlH3].[Zr] DNXNYEBMOSARMM-UHFFFAOYSA-N 0.000 claims description 6
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 abstract description 20
- 239000011362 coarse particle Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000001704 evaporation Methods 0.000 description 10
- 230000008020 evaporation Effects 0.000 description 10
- 239000003973 paint Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 8
- 238000005054 agglomeration Methods 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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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
- 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
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
-
- 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
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
-
- 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
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
- C09C3/063—Coating
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
A method for reducing agglomerate grains in titanium dioxide products comprises the steps of sequentially carrying out vibrating screen filtration, diaphragm washing, drying and dehydration, jet milling and gravity sedimentation on inorganic coated titanium dioxide slurry to obtain titanium dioxide products; the viscosity of the inorganic coated titanium dioxide slurry, the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing, the moisture content of the inorganic coated titanium dioxide after drying and dehydration, the power during jet milling and the proportion of steam and the inorganic coated titanium dioxide after drying are respectively controlled within respective specified ranges, so that agglomerated particles in titanium dioxide products are reduced. The method provided by the invention can be used for reducing the agglomerate particles in the titanium dioxide product, so that coarse particles do not appear in the downstream application field of the titanium dioxide, and the dispersion effect of the product in the downstream application field is effectively improved.
Description
Technical Field
The invention relates to the field of chemical industry, in particular to a method for reducing agglomerated particles in a titanium dioxide product.
Background
Agglomerated particles in the titanium dioxide product are key indexes for influencing the dispersing effect of the titanium dioxide in a downstream application system, and the development direction of the domestic coating field is to improve the production efficiency and reduce the production cost. The titanium dioxide particles are finer, the average particle size is 200-300 nm, once a large number of agglomerated particles are formed in the titanium dioxide product, the agglomerated particles are difficult to depolymerize in a subsequent application system, the agglomerated particles can be realized only after grinding by a medium, and many defects exist in the application of the existing coating field. Therefore, reducing agglomerate grains in titanium dioxide products is a key for better application of titanium dioxide products in the field of paint.
In the existing titanium dioxide production process, agglomerated particles are easy to generate in the following aspects: the viscosity of the slurry is too high in the inorganic coating process, so that the inorganic coating effect is poor, and agglomerated particles are generated; a small amount of coating substances self-deposit to form agglomerated particles in the inorganic coating process; in the diaphragm washing process, the soluble salt is not sufficiently washed, and agglomerated particles can be formed due to too high surface charge of the titanium dioxide; the moisture in the material drying and dewatering process is too high, and the material is easy to form agglomerated particles; the air flow crushing process has insufficient crushing power and cannot fully deagglomerate the agglomerated particles, and the system negative pressure is too high to directly bring the particles which are not deagglomerated into the product; because of the agglomeration caused by the excessive moisture of the material in a part of low-temperature area in the gas crushing process, no corresponding removing means is adopted in the conveying process to solve the problem of the part of agglomerated particles.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a method for reducing agglomerated particles in a titanium dioxide product, so that the agglomerated particles in the titanium dioxide product are reduced, and coarse particles are not generated in the downstream application field of the titanium dioxide.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a method for reducing agglomerate grains in titanium dioxide products comprises the steps of sequentially carrying out vibrating screen filtration, diaphragm washing, drying and dehydration, jet milling and gravity sedimentation on inorganic coated titanium dioxide slurry to obtain titanium dioxide products; the viscosity of the inorganic coated titanium dioxide slurry, the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing, the moisture content of the inorganic coated titanium dioxide after drying and dehydration, the power during jet milling and the proportion of steam and the inorganic coated titanium dioxide after drying are respectively controlled within respective specified ranges, so that agglomerated particles in titanium dioxide products are reduced.
Further, the power at the time of jet milling includes a system negative pressure and a steam pressure at the time of jet milling.
Further, the method comprises the following steps:
step 1: the titanium dioxide slurry is subjected to inorganic coating and is filtered by a vibrating screen to obtain filtered inorganic coating titanium dioxide slurry;
step 2: performing diaphragm washing on the filtered inorganic coated titanium dioxide slurry to obtain an inorganic coated titanium dioxide filter cake after diaphragm washing;
step 3: drying and dehydrating the inorganic coated titanium dioxide filter cake to obtain dried inorganic coated titanium dioxide;
step 4: carrying out jet milling on the dried inorganic coated titanium dioxide so as to depolymerize the dried inorganic coated titanium dioxide and obtain depolymerized inorganic coated titanium dioxide;
step 5: and (3) carrying out gravity sedimentation on the depolymerized inorganic coated titanium dioxide, and enabling the inorganic coated titanium dioxide subjected to gravity sedimentation to enter a packaging bin to obtain a titanium dioxide product.
Further, the viscosity specification range of the inorganic coated titanium dioxide slurry is less than 200 centipoise.
Further, the specific resistance of the inorganic coated titanium pigment filter cake after diaphragm washing is set to be 80 Ω·m or more.
Further, the moisture content of the dried inorganic coated titanium dioxide powder after drying and dehydration is specified to be less than or equal to 0.5%.
Further, the negative pressure regulation range of the system negative pressure during jet milling is-1.6 to-0.8 KPa; the pressure regulation range of the steam pressure during jet milling is more than or equal to 2.0MPa; the ratio of steam during jet milling to the inorganic coated titanium dioxide after drying is set to be 1.2-2.0:1.
Further, in step 5, gravity sedimentation is performed on the inorganic coated titanium pigment after depolymerization through the flat pipe section of the air supply pipe and the pipe section perpendicular to the flat pipe section of the air supply pipe.
Further, the length of the flat pipe section of the air supply pipe is 3-6 m, and the length of the pipe perpendicular to the flat pipe section of the air supply pipe is 0.4-1.0 m.
Further, flash drying is adopted in step 3 to carry out drying dehydration.
The beneficial effects of the invention are as follows:
according to the method for reducing the agglomerated particles in the titanium dioxide product, the titanium dioxide slurry subjected to inorganic coating is filtered by a vibrating screen, then is subjected to diaphragm washing, is dried and dehydrated, and is subjected to jet milling, gravity sedimentation and the like, and finally is packaged to obtain the titanium dioxide product. The agglomerated particles in the titanium dioxide slurry are reduced by controlling the viscosity of the inorganic coated titanium dioxide slurry and adopting a vibrating screen filtering mode; the surface charge of the titanium dioxide is reduced by controlling the resistivity of the inorganic coated titanium dioxide filter cake washed by the diaphragm, the subsequent agglomeration of the titanium dioxide is reduced, and the water content of the titanium dioxide after drying is controlled, so that the agglomeration is reduced; the full depolymerization of the titanium dioxide is realized by controlling the power and the material flow rate of the jet milling; and finally, removing the agglomerated particles generated in the previous process in a gravity sedimentation manner in the material conveying process, so that the agglomerated particles in the titanium dioxide product are reduced, and the application dispersion level of the titanium dioxide at the downstream is effectively improved.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
According to the method for reducing the agglomerated particles in the titanium dioxide product, the inorganic coated titanium dioxide slurry is sequentially subjected to vibrating screen filtration, diaphragm washing, drying and dehydration, jet milling and gravity sedimentation to obtain the titanium dioxide product; the viscosity of the inorganic coated titanium dioxide slurry, the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing, the moisture content of the inorganic coated titanium dioxide after drying and dehydration, the power during jet milling and the proportion of steam and the inorganic coated titanium dioxide after drying are respectively controlled within respective specified ranges, so that agglomerated particles in titanium dioxide products are reduced. Wherein the power during jet milling comprises the system negative pressure and the steam pressure during jet milling.
The method for reducing the agglomerated particles in the titanium dioxide product comprises the following steps:
step 1: the titanium dioxide slurry is subjected to inorganic coating and is filtered by a vibrating screen to obtain filtered inorganic coating titanium dioxide slurry;
step 2: performing diaphragm washing on the filtered inorganic coated titanium dioxide slurry to obtain an inorganic coated titanium dioxide filter cake after diaphragm washing;
step 3: drying and dehydrating the inorganic coated titanium dioxide filter cake to obtain dried inorganic coated titanium dioxide after drying and dehydrating, and preferably adopting flash evaporation drying to carry out drying and dehydrating;
step 4: carrying out jet milling on the dried inorganic coated titanium dioxide so as to depolymerize the dried inorganic coated titanium dioxide and obtain depolymerized inorganic coated titanium dioxide;
step 5: and (3) carrying out gravity sedimentation on the depolymerized inorganic coated titanium dioxide, and enabling the inorganic coated titanium dioxide subjected to gravity sedimentation to enter a packaging bin to obtain a titanium dioxide product.
In the method for reducing the agglomerate grains in the titanium dioxide product, the inorganic coating carried out by the titanium dioxide slurry is preferably a zirconium aluminum coating and a silicon aluminum coating.
In the process of coating the titanium dioxide slurry by inorganic coating, the viscosity of the inorganic coating titanium dioxide slurry after the titanium dioxide slurry is coated by inorganic coating is controlled within a specified viscosity range. The viscosity of the inorganic coated titanium dioxide slurry can be controlled by adding a dispersing agent or controlling the pH value of the slurry by a coating agent. Preferably, the viscosity specification range of the inorganic coated titanium dioxide slurry is less than 200 centipoise. In addition, when the inorganic coated titanium pigment slurry is filtered by a vibrating screen, the mesh number of the vibrating screen for filtering the inorganic coated titanium pigment slurry is controlled to be 325-500 meshes. Preferably, the mesh number of the vibrating screen is 500 mesh. The agglomerated particles in the inorganic coated titanium dioxide slurry are reduced by controlling the viscosity of the inorganic coated titanium dioxide slurry and adopting a vibrating screen filtering mode.
In the process of diaphragm washing the inorganic coated titanium dioxide slurry after filtering, the resistivity of the inorganic coated titanium dioxide filter cake after diaphragm washing is controlled within a specific range of resistivity. The resistivity of the inorganic coated titanium dioxide filter cake after diaphragm washing is controlled by washing to remove salt in the inorganic coated titanium dioxide filter cake, wherein washing water used for washing is desalted water or deionized water. The specific resistance of the inorganic coated titanium dioxide filter cake after diaphragm washing is more than or equal to 80 Ω & m. Preferably, the specific resistance of the inorganic coated titanium dioxide filter cake after diaphragm washing is defined to be 125 Ω·m or more. The surface charge of the inorganic coated titanium dioxide is reduced by controlling the resistivity of the inorganic coated titanium dioxide filter cake after diaphragm washing, so that the subsequent agglomeration of the inorganic coated titanium dioxide is reduced.
In the process of drying and dehydrating the inorganic coated titanium dioxide filter cake, when the inorganic coated titanium dioxide filter cake is dehydrated by flash evaporation drying, the moisture content of the dried inorganic coated titanium dioxide after drying and dehydration is controlled within a specified range of the moisture content. The water content of the dried inorganic coated titanium dioxide powder after drying and dehydration is specified to be less than or equal to 0.5 percent. Preferably, the moisture content of the dried inorganic coated titanium dioxide powder after drying and dehydration is specified to be less than or equal to 0.2%. The water content of the inorganic coated titanium dioxide after drying is controlled to reduce the agglomeration.
In the process of carrying out jet milling on the dried inorganic coated titanium dioxide, controlling the system negative pressure and the steam pressure during jet milling and the proportion of steam and the dried inorganic coated titanium dioxide in respective specified ranges, and depolymerizing the dried inorganic coated titanium dioxide. The negative pressure of the system during jet milling is set to be-1.6 to-0.8 KPa. Preferably, the negative pressure of the system negative pressure during jet milling is set to be within a range of-1.2 to-0.8 KPa. The pressure of the steam pressure during jet milling is set to 2.0MPa or more. Preferably, the pressure of the steam pressure at the time of jet milling is set to a pressure of 2.2MPa or more. The ratio of steam during jet milling to the inorganic coated titanium dioxide after drying is set to be 1.2-2.0:1. Preferably, the ratio of steam during jet milling to the inorganic coated titanium dioxide after drying is specified to be 1.4-1.6:1. The full depolymerization of the inorganic coated titanium dioxide after drying is realized by controlling the power and the flow rate of steam during jet milling and the flow rate of the inorganic coated titanium dioxide after drying.
In the gravity sedimentation process of the depolymerized inorganic coated titanium dioxide, gravity sedimentation is carried out on the depolymerized inorganic coated titanium dioxide through the flat pipe section of the air supply pipe and the pipe vertical to the flat pipe section of the air supply pipe. The length of the flat pipe section of the air supply pipeline is 3-6 m. Preferably, the length of the flat tube section of the wind delivery tube is 5-6 m. The length of the pipe perpendicular to the flat pipe section of the wind delivery pipe is 0.4 to 1.0m, preferably the length of the pipe perpendicular to the flat pipe section of the wind delivery pipe is 0.6 to 1.0m. The generated agglomerated particles are removed in the gravity sedimentation mode in the conveying process of the inorganic coated titanium dioxide, so that the agglomerated particles in the titanium dioxide product are reduced, and the application dispersion level of the titanium dioxide product at the downstream is effectively improved.
Example 1
The inorganic coated titanium dioxide slurry with the viscosity of 138 centipoise after the titanium dioxide slurry is subjected to inorganic coating is filtered by a 500-mesh vibrating screen and then is subjected to diaphragm washing, and the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing is 168 omega m; the moisture content of the inorganic coated titanium dioxide after the inorganic coated titanium dioxide filter cake is dried and dehydrated by flash evaporation is 0.2%; the inorganic coated titanium dioxide after drying enters an air flow crushing system according to the feeding amount of 3t/h (ton/h), the steam pressure is 2.20MPa, the steam flow is 4.0t/h, the negative pressure of the air flow crushing system is controlled to be-0.98 KPa, and the inorganic coated titanium dioxide after depolymerization enters a packaging bin after gravity sedimentation to obtain a titanium dioxide product. Wherein the length of the flat tube section of the wind delivery pipe in the gravity sedimentation process is 5m, and the length of the pipe perpendicular to the flat tube section of the wind delivery pipe is 0.65m. Wherein the inorganic coating adopts a silicon-aluminum coating. The titanium pigment product is scraped into a film detection film with 4 agglomerated particles after being subjected to high stirring dispersion of water-based paint, so that the dispersion requirement of the downstream field is met.
Example 2
The inorganic coated titanium dioxide slurry with the viscosity of 156 centipoises after the titanium dioxide slurry is subjected to inorganic coating is filtered by a 500-mesh vibrating screen and then is subjected to diaphragm washing, and the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing is 186 Ω & m; the moisture content of the inorganic coated titanium dioxide after the inorganic coated titanium dioxide filter cake is dried and dehydrated by flash evaporation is 0.2%; the inorganic coated titanium dioxide after drying enters an air flow crushing system according to the feeding amount of 3.2t/h, the steam pressure is 2.30MPa, the steam flow is 4.2t/h, the negative pressure of the air flow crushing system is controlled to be-0.86 KPa, and the inorganic coated titanium dioxide after depolymerization enters a packaging bin after gravity sedimentation to obtain a titanium dioxide product. Wherein the length of the flat tube section of the wind delivery pipe in the gravity sedimentation process is 5m, and the length of the pipe perpendicular to the flat tube section of the wind delivery pipe is 0.65m. Wherein the inorganic coating adopts a silicon-aluminum coating. The titanium pigment product is scraped into a film detection film after being subjected to high stirring dispersion of water-based paint, the number of agglomerated particles on the film detection film is 2, and the dispersion requirement in the downstream field is met.
Example 3
The inorganic coated titanium dioxide slurry with the viscosity of 148 centipoises after the titanium dioxide slurry is subjected to inorganic coating is filtered by a 500-mesh vibrating screen and then is subjected to diaphragm washing, and the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing is 138 omega m; the moisture content of the inorganic coated titanium dioxide after the inorganic coated titanium dioxide filter cake is dried and dehydrated by flash evaporation is 0.3 percent; the inorganic coated titanium dioxide after drying enters an air flow crushing system according to the feeding amount of 3t/h, the steam pressure is 2.25MPa, the steam flow is 3.8t/h, the negative pressure of the air flow crushing system is controlled to be-1.06 KPa, the inorganic coated titanium dioxide after depolymerization enters a packaging bin after gravity sedimentation to obtain a titanium dioxide product, wherein the length of a flat pipe section of an air conveying pipe in the gravity sedimentation process is 5m, and the length of a pipe perpendicular to the flat pipe section of the air conveying pipe is 0.65m. Wherein the inorganic coating adopts a silicon-aluminum coating. The titanium pigment product is scraped into a film detection film after being subjected to high stirring dispersion of water-based paint, the number of agglomerated particles on the film detection film is 5, and the dispersion requirement in the downstream field is met.
Example 4
The inorganic coated titanium dioxide slurry with the viscosity of 165 centipoise after the titanium dioxide slurry is subjected to inorganic coating is filtered by a 500-mesh vibrating screen and then is subjected to diaphragm washing, and the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing is 165 Ω & m; the moisture content of the inorganic coated titanium dioxide after the inorganic coated titanium dioxide filter cake is dried and dehydrated by flash evaporation is 0.2%; the inorganic coated titanium dioxide after drying enters an air flow crushing system according to the feeding amount of 3t/h, the steam pressure is 2.30MPa, the steam flow is 4.0t/h, the negative pressure of the air flow crushing system is controlled to be-0.95 KPa, and the inorganic coated titanium dioxide after depolymerization enters a packaging bin after gravity sedimentation to obtain a titanium dioxide product. Wherein the length of the flat tube section of the wind delivery pipe in the gravity sedimentation process is 5m, and the length of the pipe perpendicular to the flat tube section of the wind delivery pipe is 0.65m. Wherein the inorganic coating adopts a silicon-aluminum coating. The titanium pigment product is scraped into a film detection film after being subjected to high stirring dispersion of water-based paint, the number of agglomerated particles on the film detection film is 3, and the dispersion requirement in the downstream field is met.
Example 5
The inorganic coated titanium dioxide slurry with the viscosity of 141 centipoise after the titanium dioxide slurry is subjected to inorganic coating is filtered by a 325-mesh vibrating screen and then is subjected to diaphragm washing, and the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing is 80 Ω & m; the moisture content of the inorganic coated titanium dioxide after the inorganic coated titanium dioxide filter cake is dried and dehydrated by flash evaporation is 0.5%; the inorganic coated titanium dioxide after drying enters an air flow crushing system according to the feeding amount of 3t/h, the steam pressure is 2.00MPa, the steam flow is 3.6t/h, the negative pressure of the air flow crushing system is controlled to be-0.80 KPa, and the inorganic coated titanium dioxide after depolymerization enters a packaging bin after gravity sedimentation to obtain a titanium dioxide product. Wherein the length of the flat pipe section of the wind delivery pipe in the gravity sedimentation process is 6m, and the length of the pipe perpendicular to the flat pipe section of the wind delivery pipe is 1m. Wherein the inorganic coating adopts a zirconium aluminum coating. The titanium pigment product is scraped into a film detection film after being subjected to high stirring dispersion of water-based paint, the number of agglomerated particles on the film detection film is 6, and the dispersion requirement in the downstream field is met.
Example 6
The inorganic coated titanium dioxide slurry with the viscosity of 160 centipoise after the titanium dioxide slurry is subjected to inorganic coating is filtered by a 325-mesh vibrating screen and then is subjected to diaphragm washing, and the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing is 125 Ω & m; the moisture content of the inorganic coated titanium dioxide after the inorganic coated titanium dioxide filter cake is dried and dehydrated by flash evaporation is 0.2%; the inorganic coated titanium dioxide after drying enters an air flow crushing system according to the feeding amount of 2.6t/h, the steam pressure is 2.35MPa, the steam flow is 5.2t/h, the negative pressure of the air flow crushing system is controlled to be-1.6 KPa, and the inorganic coated titanium dioxide after depolymerization enters a packaging bin after gravity sedimentation to obtain a titanium dioxide product. Wherein the length of the flat pipe section of the wind pipe in the gravity sedimentation process is 3m, and the length of the pipe perpendicular to the flat pipe section of the wind pipe is 0.4m. Wherein the inorganic coating adopts a zirconium aluminum coating. The titanium pigment product is scraped into a film detection film after being subjected to high stirring dispersion of water-based paint, the number of agglomerated particles on the film detection film is 5, and the dispersion requirement in the downstream field is met.
Example 7
The inorganic coated titanium dioxide slurry with the viscosity of 150 centipoise after the titanium dioxide slurry is subjected to inorganic coating is filtered by a 500-mesh vibrating screen and then is subjected to diaphragm washing, and the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing is 182 Ω & m; the moisture content of the inorganic coated titanium dioxide after the inorganic coated titanium dioxide filter cake is dried and dehydrated by flash evaporation is 0.2%; the inorganic coated titanium dioxide after drying enters an air flow crushing system according to the feeding amount of 3t/h, the steam pressure is 2.30MPa, the steam flow is 4.2t/h, the negative pressure of the air flow crushing system is controlled to be-0.83 KPa, and the inorganic coated titanium dioxide after depolymerization enters a packaging bin after gravity sedimentation to obtain a titanium dioxide product. Wherein the length of the flat pipe section of the wind pipe in the gravity sedimentation process is 5m, and the length of the pipe perpendicular to the flat pipe section of the wind pipe is 0.6m. Wherein the inorganic coating adopts a zirconium aluminum coating. The titanium pigment product is scraped into a film detection film after being subjected to high stirring dispersion of water-based paint, the number of agglomerated particles on the film detection film is 2, and the dispersion requirement in the downstream field is met.
Example 8
The inorganic coated titanium dioxide slurry with the viscosity of 143 centipoise after the titanium dioxide slurry is subjected to inorganic coating is filtered by a 500-mesh vibrating screen and then is subjected to diaphragm washing, and the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing is 178 Ω & m; the moisture content of the inorganic coated titanium dioxide after the inorganic coated titanium dioxide filter cake is dried and dehydrated by flash evaporation is 0.2%; the inorganic coated titanium dioxide after drying enters an air flow crushing system according to the feeding amount of 3t/h, the steam pressure is 2.25MPa, the steam flow is 4.8t/h, the negative pressure of the air flow crushing system is controlled to be-1.2 KPa, and the inorganic coated titanium dioxide after depolymerization enters a packaging bin after gravity sedimentation to obtain a titanium dioxide product. Wherein the length of the flat pipe section of the wind pipe in the gravity sedimentation process is 5m, and the length of the pipe perpendicular to the flat pipe section of the wind pipe is 0.6m. Wherein the inorganic coating adopts a zirconium aluminum coating. The titanium pigment product is scraped into a film detection film after being subjected to high stirring dispersion of water-based paint, the number of agglomerated particles on the film detection film is 3, and the dispersion requirement in the downstream field is met.
According to the method for reducing the agglomerated particles in the titanium dioxide product, the proportion of coarse particles in the obtained titanium dioxide product is obviously reduced, the proportion of coarse particles in the titanium dioxide product prepared by a normal process is less than 50%, and the proportion of coarse particles in the titanium dioxide product prepared by the method is more than 85%.
The method for reducing the agglomerated particles in the titanium dioxide product can reduce the agglomerated particles in the titanium dioxide product, so that coarse particles do not appear in the downstream application field of the titanium dioxide, and the dispersion effect of the product in the downstream application field is effectively improved.
The foregoing examples merely illustrate embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (4)
1. A method for reducing agglomerate grains in a titanium dioxide product is characterized in that inorganic coated titanium dioxide slurry is sequentially subjected to vibrating screen filtration, diaphragm washing, drying and dehydration, jet milling and gravity sedimentation to obtain the titanium dioxide product; the viscosity of the inorganic coated titanium dioxide slurry, the resistivity of an inorganic coated titanium dioxide filter cake after diaphragm washing, the moisture content of the dried inorganic coated titanium dioxide after drying and dehydration, the power during jet milling and the proportion of steam and the dried inorganic coated titanium dioxide are respectively controlled within respective specified ranges, so that agglomerated particles in the titanium dioxide product are reduced;
the method comprises the following steps:
step 1: the inorganic coated titanium dioxide slurry obtained after the titanium dioxide slurry is subjected to inorganic coating is filtered by the vibrating screen to obtain the filtered inorganic coated titanium dioxide slurry;
step 2: performing diaphragm washing on the filtered inorganic coated titanium dioxide slurry to obtain a diaphragm washed inorganic coated titanium dioxide filter cake;
step 3: drying and dehydrating the inorganic coated titanium dioxide filter cake to obtain dried inorganic coated titanium dioxide;
step 4: carrying out jet milling on the dried inorganic coated titanium dioxide so as to depolymerize the dried inorganic coated titanium dioxide and obtain depolymerized inorganic coated titanium dioxide;
step 5: carrying out gravity sedimentation on the depolymerized inorganic coated titanium dioxide, and enabling the inorganic coated titanium dioxide subjected to gravity sedimentation to enter a packaging bin to obtain the titanium dioxide product;
in the step 5, gravity sedimentation is carried out on the inorganic coated titanium dioxide after depolymerization through a flat pipe section of the air supply pipe and a pipe vertical to the flat pipe section of the air supply pipe;
the inorganic coating carried out by the titanium dioxide slurry is a zirconium aluminum coating and a silicon aluminum coating; the viscosity of the inorganic coated titanium dioxide slurry is controlled by adding a dispersing agent or controlling the pH value of the slurry by a coating agent, wherein the specified range of the viscosity of the inorganic coated titanium dioxide slurry is less than 200 centipoise; when the inorganic coated titanium pigment slurry is filtered by a vibrating screen, controlling the mesh number of the vibrating screen for filtering the inorganic coated titanium pigment slurry, wherein the mesh number of the vibrating screen is 325-500 meshes; the specific resistance of the inorganic coated titanium dioxide filter cake is set to be more than or equal to 125 omega-m; the specified range of the moisture content of the dried inorganic coated titanium dioxide after drying and dehydration is less than or equal to 0.5%; the power during jet milling comprises system negative pressure and steam pressure during jet milling, and the negative pressure regulation range of the system negative pressure during jet milling is-1.6 to-0.8 KPa; the pressure of the steam pressure during jet milling is set to 2.0MPa or more.
2. The method for reducing agglomerated particles in a titanium dioxide product according to claim 1, wherein the ratio of said steam to said dried inorganic coated titanium dioxide powder during jet milling is specified in the range of 1.2 to 2.0:1.
3. The method for reducing agglomerated particles in a titanium pigment product according to claim 1, wherein the length of the flat tube section of the air supply tube is 3 to 6m, and the length of the tube perpendicular to the flat tube section of the air supply tube is 0.4 to 1.0m.
4. The method for reducing agglomerated particles in a titanium dioxide product according to claim 1, wherein flash drying is used in step 3 for drying and dewatering.
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