CN115260795A - Method for reducing agglomerated particles in titanium dioxide product - Google Patents
Method for reducing agglomerated particles in titanium dioxide product Download PDFInfo
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- CN115260795A CN115260795A CN202211034307.4A CN202211034307A CN115260795A CN 115260795 A CN115260795 A CN 115260795A CN 202211034307 A CN202211034307 A CN 202211034307A CN 115260795 A CN115260795 A CN 115260795A
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- titanium dioxide
- inorganic coated
- coated titanium
- agglomerated particles
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 476
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 238
- 239000002245 particle Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000000047 product Substances 0.000 claims abstract description 65
- 239000002002 slurry Substances 0.000 claims abstract description 54
- 238000010902 jet-milling Methods 0.000 claims abstract description 47
- 238000001035 drying Methods 0.000 claims abstract description 44
- 239000012065 filter cake Substances 0.000 claims abstract description 37
- 238000005406 washing Methods 0.000 claims abstract description 36
- 230000005484 gravity Effects 0.000 claims abstract description 33
- 230000018044 dehydration Effects 0.000 claims abstract description 19
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 19
- 238000009288 screen filtration Methods 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims description 40
- 239000011248 coating agent Substances 0.000 claims description 38
- 238000001914 filtration Methods 0.000 claims description 15
- 238000004806 packaging method and process Methods 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 abstract description 21
- 239000011362 coarse particle Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 238000001514 detection method Methods 0.000 description 8
- 239000003973 paint Substances 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- DNXNYEBMOSARMM-UHFFFAOYSA-N alumane;zirconium Chemical group [AlH3].[Zr] DNXNYEBMOSARMM-UHFFFAOYSA-N 0.000 description 5
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 5
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 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
- 238000009775 high-speed stirring Methods 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
Abstract
A method for reducing agglomerated particles in a titanium dioxide product comprises the steps of sequentially carrying out vibrating screen filtration, diaphragm washing, drying and dehydration, airflow crushing and gravity settling on inorganic coated titanium dioxide slurry to obtain the titanium dioxide product; the viscosity of the inorganic coated titanium dioxide slurry, the resistivity of the 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 to the dried inorganic coated titanium dioxide are respectively controlled within respective specified ranges, so that the agglomerated particles in the titanium dioxide product are reduced. The method of the invention realizes the reduction of agglomerated particles in the titanium dioxide product, so that the titanium dioxide does not have coarse particles in the downstream application field, 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 titanium dioxide products are key indexes influencing the dispersion effect of a downstream application system of titanium dioxide, and the development direction of the current domestic coating field is to improve the production efficiency and reduce the production cost. The titanium dioxide powder is dispersed in most coating fields by adopting a high-speed stirring mode without a grinding process, once a large amount of agglomerated particles are formed in a titanium dioxide product due to the fact that titanium dioxide particles are fine and the average particle size is 200-300 nm, the agglomerated particles are difficult to depolymerize in a subsequent application system and can be realized only after being ground by a medium, and the titanium dioxide powder is more defective in application in the existing coating field. Therefore, the reduction of agglomerated particles in the titanium dioxide product is the key for better application of the titanium dioxide product in the field of coatings.
In the existing titanium dioxide production process, agglomerated particles are easily generated in the following aspects: during the inorganic coating process, the slurry viscosity is too high, so that the inorganic coating effect is poor, and agglomerated particles are generated; in the inorganic coating process, a small amount of coating substances are precipitated by self to form agglomerated particles; soluble salt is not fully washed clean in the washing process of the diaphragm, and agglomerated particles can be formed when the surface charge of the titanium dioxide is too high; the moisture content of the material is too high in the process of drying and dehydrating the material, and the material is easy to form agglomerated particles; the crushing power is insufficient in the jet milling process, agglomerated particles cannot be depolymerized fully, and the negative pressure of the system is too high, so that particles which are not depolymerized are easily brought into a product directly; because the low temperature area of part of the gas crushing process leads to the material moisture being too high and generating agglomeration, no corresponding removing means is provided in the conveying process to solve the problem of the part of agglomerated particles.
Disclosure of Invention
Aiming at the defects 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 the titanium dioxide does not have coarse particles in the downstream application field.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for reducing agglomerated particles in a titanium dioxide product comprises the steps of sequentially carrying out vibrating screen filtration, diaphragm washing, drying and dehydration, airflow crushing and gravity settling on inorganic coated titanium dioxide slurry to obtain the titanium dioxide product; the viscosity of the inorganic coated titanium dioxide slurry, the resistivity of the inorganic coated titanium dioxide filter cake after the diaphragm is washed, the moisture content of the dried inorganic coated titanium dioxide after drying and dehydration, the power during jet milling and the proportion of steam to the dried inorganic coated titanium dioxide are respectively controlled within respective specified ranges, so that the agglomerated particles in the titanium dioxide product are reduced.
Further, the power for jet milling includes the system negative pressure and steam pressure for jet milling.
Further, the method comprises the following steps:
step 1: filtering the inorganic coated titanium dioxide slurry obtained by inorganic coating of the titanium dioxide slurry by using a vibrating screen to obtain the filtered inorganic coated titanium dioxide slurry;
and 2, step: carrying out diaphragm washing on the filtered inorganic coated titanium dioxide slurry to obtain an inorganic coated titanium dioxide filter cake after diaphragm washing;
and 3, step 3: drying and dehydrating the inorganic coated titanium dioxide filter cake to obtain dried inorganic coated titanium dioxide after drying and dehydration;
and 4, step 4: performing jet milling on the dried inorganic coated titanium dioxide to depolymerize the dried inorganic coated titanium dioxide to obtain depolymerized inorganic coated titanium dioxide;
and 5: and (3) performing gravity settling on the depolymerized inorganic coated titanium dioxide, and feeding the inorganic coated titanium dioxide subjected to gravity settling into a packaging bin to obtain a titanium dioxide product.
Further, the viscosity of the inorganic coated titanium dioxide slurry is specified to be less than 200 centipoises.
Furthermore, the specific resistance range of the inorganic coated titanium dioxide filter cake after membrane washing is more than or equal to 80 omega m.
Further, 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 percent.
Furthermore, the specified negative pressure range of the system negative pressure during jet milling is-1.6 to-0.8 KPa; the pressure of steam pressure during jet milling is specified in a range of more than or equal to 2.0MPa; the proportion of the steam during jet milling and the dried inorganic coated titanium dioxide is specified to be 1.2-2.0.
Further, in the step 5, the depolymerized inorganic coated titanium dioxide is subjected to gravity settling through a flat pipe section of the air conveying pipeline and a pipeline perpendicular to the flat pipe section of the air conveying pipeline.
Furthermore, the length of the flat pipe section of the wind conveying pipeline is 3-6 m, and the length of the pipeline vertical to the flat pipe section of the wind conveying pipeline is 0.4-1.0 m.
Further, in step 3, flash drying is adopted for drying and dehydration.
The invention has the beneficial effects that:
the method for reducing agglomerated particles in the titanium dioxide product comprises the steps of filtering inorganic coated titanium dioxide slurry by a vibrating screen, washing a diaphragm, drying and dehydrating, carrying out jet milling, gravity settling and the like, and finally packaging to obtain the titanium dioxide product. Reducing agglomerated particles in the titanium dioxide slurry by controlling the viscosity of the inorganic coated titanium dioxide slurry and adopting a vibrating screen filtering mode; the resistivity of the filter cake of the inorganic coated titanium dioxide washed by the diaphragm is controlled to reduce the surface charge of the titanium dioxide, the subsequent agglomeration of the titanium dioxide is reduced, and the moisture after the titanium dioxide is dried is controlled to reduce the agglomerates; the full depolymerization of the titanium dioxide is realized by controlling the power of jet milling and the flow rate of materials; finally, the agglomerated particles generated in the previous process are removed in a gravity settling mode 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 in the downstream is effectively improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method for reducing agglomerated particles in a titanium dioxide product, which comprises the steps of sequentially carrying out vibrating screen filtration, diaphragm washing, drying and dehydration, airflow crushing and gravity settling on inorganic coated titanium dioxide slurry to obtain the titanium dioxide product; the viscosity of the inorganic coated titanium dioxide slurry, the resistivity of the 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 to the dried inorganic coated titanium dioxide are respectively controlled within respective specified ranges, so that the agglomerated particles in the titanium dioxide product are reduced. Wherein the power of jet milling comprises the system negative pressure and steam pressure of the jet milling.
The method for reducing agglomerated particles in the titanium dioxide product comprises the following steps:
step 1: filtering the inorganic coated titanium dioxide slurry obtained by inorganic coating of the titanium dioxide slurry by using a vibrating screen to obtain the filtered inorganic coated titanium dioxide slurry;
step 2: carrying out diaphragm washing on the filtered inorganic coated titanium dioxide slurry to obtain an inorganic coated titanium dioxide filter cake after diaphragm washing;
and step 3: drying and dehydrating the inorganic coated titanium dioxide filter cake to obtain dried inorganic coated titanium dioxide after drying and dehydration, and preferably drying and dehydrating by flash drying;
and 4, step 4: performing jet milling on the dried inorganic coated titanium dioxide to depolymerize the dried inorganic coated titanium dioxide to obtain depolymerized inorganic coated titanium dioxide;
and 5: and (3) performing gravity settling on the depolymerized inorganic coated titanium dioxide, and feeding the inorganic coated titanium dioxide subjected to gravity settling into a packaging bin to obtain a titanium dioxide product.
In the method for reducing agglomerated particles in the titanium dioxide product, the inorganic coating of the titanium dioxide slurry is preferably a zirconium-aluminum coating or a silicon-aluminum coating.
In the process of inorganic coating of the titanium dioxide slurry, the viscosity of the inorganic coated titanium dioxide slurry after inorganic coating of the titanium dioxide slurry 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 through a coating agent. Preferably, the viscosity of the inorganic coated titanium dioxide slurry is specified to be less than 200 centipoises. In addition, when the inorganic coated titanium dioxide slurry is filtered by the vibrating screen, the mesh number of the vibrating screen for filtering the inorganic coated titanium dioxide slurry is controlled, and the mesh number of the vibrating screen is 325-500 meshes. Preferably, the mesh number of the vibrating screen is 500 meshes. 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.
And in the process of washing the membrane of the filtered inorganic coated titanium dioxide slurry, controlling the resistivity of the inorganic coated titanium dioxide filter cake washed by the membrane within a specified resistivity range. And (3) washing to remove the salt in the inorganic coated titanium dioxide filter cake to control the resistivity of the inorganic coated titanium dioxide filter cake after the membrane is washed, wherein the washing water used for washing is desalted water or deionized water. The specific range of the resistivity of the inorganic coated titanium dioxide filter cake after the membrane washing is more than or equal to 80 omega m. Preferably, the specific resistance of the inorganic coated titanium dioxide filter cake after membrane washing is more than or equal to 125 omega-m. The surface charge of the inorganic coated titanium dioxide is reduced by controlling the resistivity of the filter cake of the inorganic coated titanium dioxide after the membrane is washed, 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 flash drying is adopted to dehydrate the inorganic coated titanium dioxide filter cake, the moisture content of the dried inorganic coated titanium dioxide after drying and dehydration is controlled within the specified range of the moisture content. The water content of the dried inorganic coated titanium dioxide after drying and dehydration is less than or equal to 0.5 percent. Preferably, the specified range of the moisture content of the dried inorganic coated titanium dioxide after drying and dehydration is less than or equal to 0.2 percent. The aggregate is reduced by controlling the moisture content of the dried inorganic coated titanium dioxide.
In the process of jet milling the dried inorganic coated titanium dioxide, the system negative pressure and the steam pressure during jet milling and the proportion of the steam to the dried inorganic coated titanium dioxide are controlled within respective specified ranges, and the dried inorganic coated titanium dioxide is depolymerized. The specified negative pressure range of the system negative pressure during jet milling is-1.6 KPa to-0.8 KPa. Preferably, the specified range of the negative pressure of the system negative pressure during jet milling is-1.2 KPa to-0.8 KPa. The pressure of steam pressure during jet milling is set to 2.0MPa or more. Preferably, the steam pressure in the jet milling is set in a range of 2.2MPa or more. The proportion of the steam during jet milling and the dried inorganic coated titanium dioxide is specified to be 1.2-2.0. Preferably, the ratio of the steam during jet milling to the dried inorganic coated titanium dioxide is specified to be in the range of 1.4-1.6. The full depolymerization of the dried inorganic coated titanium dioxide is realized by controlling the power and the steam during jet milling and the flow velocity of the dried inorganic coated titanium dioxide.
In the process of performing gravity settling on the depolymerized inorganic coated titanium dioxide, the depolymerized inorganic coated titanium dioxide is subjected to gravity settling through a flat pipe section of the air conveying pipeline and a pipeline perpendicular to the flat pipe section of the air conveying pipeline. The length of the flat pipe section of the air supply pipeline is 3-6 m. Preferably, the length of the flat pipe section of the air supply pipeline is 5-6 m. The length of the pipeline perpendicular to the flat pipe section of the wind conveying pipeline is 0.4-1.0 m, and preferably the length of the pipeline perpendicular to the flat pipe section of the wind conveying pipeline is 0.6-1.0 m. The generated agglomerated particles are removed in the conveying process of the inorganic coated titanium dioxide through a gravity settling mode, so that the agglomerated particles in the titanium dioxide product are reduced, and the downstream application dispersion level of the titanium dioxide product is effectively improved.
Example 1
Filtering the inorganic coated titanium dioxide slurry with the viscosity of 138 centipoises after inorganic coating of the titanium dioxide slurry by using a 500-mesh vibrating screen, and then washing a diaphragm, wherein the resistivity of an inorganic coated titanium dioxide filter cake after washing the diaphragm is 168 omega-m; the water content of the inorganic coated titanium dioxide after drying and dehydrating the inorganic coated titanium dioxide filter cake by flash drying is 0.2 percent; and (3) feeding the dried inorganic coated titanium dioxide into a jet milling system according to the feeding amount of 3t/h (ton/hour), wherein the steam pressure is 2.20MPa, the steam flow is 4.0t/h, the system negative pressure of the jet milling system is controlled to be-0.98 KPa, and the depolymerized inorganic coated titanium dioxide enters a packaging bin after gravity settling to obtain a titanium dioxide product. The length of the flat pipe section of the pneumatic conveying pipeline in the gravity settling process is 5m, and the length of the pipeline perpendicular to the flat pipe section of the pneumatic conveying pipeline is 0.65m. Wherein the inorganic coating adopts a silicon-aluminum coating. The titanium dioxide product is subjected to high-stirring dispersion of the water-based paint and then scraped into 4 agglomerated particles on a film detection film, so that the dispersion requirement of the downstream field is met.
Example 2
Filtering the inorganic coated titanium dioxide slurry with the viscosity of 156 centipoises after the titanium dioxide slurry is subjected to inorganic coating by a 500-mesh vibrating screen, and then washing a diaphragm, wherein the resistivity of an inorganic coated titanium dioxide filter cake after washing the diaphragm is 186 omega-m; the water content of the inorganic coated titanium dioxide after drying and dehydrating the inorganic coated titanium dioxide filter cake by flash drying is 0.2 percent; and (3) feeding the dried inorganic coated titanium dioxide into a jet milling system according to the feeding amount of 3.2t/h, controlling the steam pressure to be 2.30MPa and the steam flow to be 4.2t/h, controlling the system negative pressure of the jet milling system to be-0.86 KPa, and feeding the depolymerized inorganic coated titanium dioxide into a packaging bin after gravity settling to obtain a titanium dioxide product. The length of the flat pipe section of the pneumatic conveying pipeline in the gravity settling process is 5m, and the length of the pipeline perpendicular to the flat pipe section of the pneumatic conveying pipeline is 0.65m. Wherein the inorganic coating adopts a silicon-aluminum coating. The titanium dioxide product is subjected to high-stirring dispersion of the water-based paint and then scraped into 2 agglomerated particles on a film detection film, so that the dispersion requirement of the downstream field is met.
Example 3
Filtering the inorganic coated titanium dioxide slurry with the viscosity of 148 centipoises after the titanium dioxide slurry is subjected to inorganic coating by a 500-mesh vibrating screen, and then washing a diaphragm, wherein the resistivity of an inorganic coated titanium dioxide filter cake after washing the diaphragm is 138 omega-m; the water content of the inorganic coated titanium dioxide after drying and dehydrating the inorganic coated titanium dioxide filter cake by flash drying is 0.3 percent; and (2) feeding the dried inorganic coated titanium dioxide into a jet milling system according to the feeding quantity of 3t/h, wherein the steam pressure is 2.25MPa, the steam flow is 3.8t/h, the system negative pressure of the jet milling system is controlled to be-1.06 KPa, and the depolymerized inorganic coated titanium dioxide enters a packaging bin after gravity settling to obtain a titanium dioxide product, wherein the length of a flat pipe section of a pneumatic conveying pipeline in the gravity settling process is 5m, and the length of a pipeline perpendicular to the flat pipe section of the pneumatic conveying pipeline is 0.65m. Wherein the inorganic coating adopts a silicon-aluminum coating. The titanium dioxide product is subjected to high-stirring dispersion of the water-based paint and then scraped into 5 agglomerated particles on a film detection film, so that the dispersion requirement of the downstream field is met.
Example 4
Filtering the inorganic coated titanium dioxide slurry with the viscosity of 165 centipoises after inorganic coating of the titanium dioxide slurry by using a 500-mesh vibrating screen, and then washing a diaphragm, wherein the resistivity of an inorganic coated titanium dioxide filter cake after washing the diaphragm is 165 omega-m; the water content of the inorganic coated titanium dioxide after drying and dehydrating the inorganic coated titanium dioxide filter cake by flash drying is 0.2 percent; and (3) feeding the dried inorganic coated titanium dioxide into a jet milling system according to the feeding quantity of 3t/h, controlling the steam pressure to be 2.30MPa, the steam flow to be 4.0t/h and the system negative pressure of the jet milling system to be-0.95 KPa, and feeding the depolymerized inorganic coated titanium dioxide into a packaging bin after gravity settling to obtain a titanium dioxide product. The length of the flat pipe section of the pneumatic conveying pipeline in the gravity settling process is 5m, and the length of the pipeline perpendicular to the flat pipe section of the pneumatic conveying pipeline is 0.65m. Wherein the inorganic coating adopts a silicon-aluminum coating. The titanium dioxide product is subjected to high-stirring dispersion of the water-based paint and then scraped into 3 agglomerated particles on a film detection film, so that the dispersion requirement of the downstream field is met.
Example 5
Filtering the inorganic coated titanium dioxide slurry with the viscosity of 141 centipoise after the titanium dioxide slurry is subjected to inorganic coating by a 325-mesh vibrating screen, and then washing a diaphragm, wherein the resistivity of an inorganic coated titanium dioxide filter cake after the diaphragm is washed is 80 omega-m; the water content of the inorganic coated titanium dioxide after drying and dehydrating the inorganic coated titanium dioxide filter cake by flash drying is 0.5 percent; and (3) feeding the dried inorganic coated titanium dioxide into a jet milling system according to the feeding quantity of 3t/h, controlling the steam pressure to be 2.00MPa and the steam flow to be 3.6t/h, controlling the system negative pressure of the jet milling system to be-0.80 KPa, and feeding the depolymerized inorganic coated titanium dioxide into a packaging bin after gravity settling to obtain a titanium dioxide product. The length of the flat pipe section of the wind conveying pipeline in the gravity settling process is 6m, and the length of the pipeline perpendicular to the flat pipe section of the wind conveying pipeline is 1m. Wherein the inorganic coating adopts zirconium-aluminum coating. The titanium dioxide product is subjected to high-stirring dispersion of the water-based paint and then scraped into 6 agglomerated particles on a film detection film, so that the dispersion requirement of the downstream field is met.
Example 6
Filtering the inorganic coated titanium dioxide slurry with the viscosity of 160 centipoises after the titanium dioxide slurry is subjected to inorganic coating by a 325-mesh vibrating screen, and then washing a diaphragm, wherein the resistivity of an inorganic coated titanium dioxide filter cake after washing the diaphragm is 125 omega-m; the water content of the dried inorganic coated titanium dioxide after the drying and dehydration of the inorganic coated titanium dioxide filter cake by flash evaporation is 0.2 percent; and (3) feeding the dried inorganic coated titanium dioxide into a jet milling system according to the feeding amount of 2.6t/h, wherein the steam pressure is 2.35MPa, the steam flow is 5.2t/h, the system negative pressure of the jet milling system is controlled to be-1.6 KPa, and the depolymerized inorganic coated titanium dioxide enters a packaging bin after gravity settling to obtain a titanium dioxide product. The length of the flat pipe section of the pneumatic conveying pipeline in the gravity settling process is 3m, and the length of the pipeline perpendicular to the flat pipe section of the pneumatic conveying pipeline is 0.4m. Wherein the inorganic coating adopts zirconium-aluminum coating. The titanium dioxide product is subjected to high-stirring dispersion of the water-based paint and then scraped into 5 agglomerated particles on a film detection film, so that the dispersion requirement of the downstream field is met.
Example 7
Filtering the inorganic coated titanium dioxide slurry with the viscosity of 150 centipoises after the titanium dioxide slurry is subjected to inorganic coating by a 500-mesh vibrating screen, and then washing a diaphragm, wherein the resistivity of an inorganic coated titanium dioxide filter cake after washing the diaphragm is 182 omega-m; the water content of the inorganic coated titanium dioxide after drying and dehydrating the inorganic coated titanium dioxide filter cake by flash drying is 0.2 percent; and (3) feeding the dried inorganic coated titanium dioxide into a jet milling system according to the feeding quantity of 3t/h, controlling the steam pressure to be 2.30MPa, the steam flow to be 4.2t/h and the system negative pressure of the jet milling system to be-0.83 KPa, and feeding the depolymerized inorganic coated titanium dioxide into a packaging bin after gravity settling to obtain a titanium dioxide product. The length of the flat pipe section of the pneumatic conveying pipeline in the gravity settling process is 5m, and the length of the pipeline perpendicular to the flat pipe section of the pneumatic conveying pipeline is 0.6m. Wherein the inorganic coating adopts zirconium-aluminum coating. The titanium dioxide product is subjected to high-stirring dispersion of the water-based paint and then scraped into 2 agglomerated particles on a film detection film, so that the dispersion requirement of the downstream field is met.
Example 8
Filtering the inorganic coated titanium dioxide slurry with the viscosity of 143 centipoises after the titanium dioxide slurry is subjected to inorganic coating by a 500-mesh vibrating screen, and then washing a diaphragm, wherein the resistivity of an inorganic coated titanium dioxide filter cake after the diaphragm is washed is 178 omega-m; the water content of the inorganic coated titanium dioxide after drying and dehydrating the inorganic coated titanium dioxide filter cake by flash drying is 0.2 percent; and (3) feeding the dried inorganic coated titanium dioxide into a jet milling system according to the feeding quantity of 3t/h, controlling the steam pressure to be 2.25MPa, the steam flow to be 4.8t/h and the system negative pressure of the jet milling system to be-1.2 KPa, and feeding the depolymerized inorganic coated titanium dioxide into a packaging bin after gravity settling to obtain a titanium dioxide product. The length of the flat pipe section of the pneumatic conveying pipeline in the gravity settling process is 5m, and the length of the pipeline perpendicular to the flat pipe section of the pneumatic conveying pipeline is 0.6m. Wherein the inorganic coating adopts zirconium-aluminum coating. The titanium dioxide product is subjected to high-stirring dispersion of the water-based paint and then scraped into 3 agglomerated particles on a film detection film, so that the dispersion requirement of the downstream field is met.
According to the method for reducing agglomerated particles in the titanium dioxide product, the proportion of coarse particles in the obtained titanium dioxide product is obviously reduced, the proportion of the coarse particles in the titanium dioxide product prepared by a normal process is less than or equal to 8 and less than 50%, and the proportion of the coarse particles in the titanium dioxide product prepared by the method is less than or equal to 8 and reaches 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 the titanium dioxide does not have coarse particles in the downstream application field, and the dispersion effect of the product in the downstream application field is effectively improved.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. A method for reducing agglomerated particles 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, airflow crushing and gravity settling to obtain the titanium dioxide product; the viscosity of the inorganic coated titanium dioxide slurry, the resistivity of the inorganic coated titanium dioxide filter cake after the diaphragm is washed, the moisture content of the dried inorganic coated titanium dioxide after drying and dehydration, the power during jet milling and the proportion of steam to the dried inorganic coated titanium dioxide are respectively controlled within respective specified ranges, so that the agglomerated particles in the titanium dioxide product are reduced.
2. The method for reducing agglomerated particles in a titanium dioxide product according to claim 1, wherein the power for jet milling comprises the system negative pressure and steam pressure for jet milling.
3. The method for reducing agglomerated particles in a titanium dioxide product according to claim 2, characterized by comprising the following steps:
step 1: filtering the inorganic coated titanium dioxide slurry obtained by inorganic coating of the titanium dioxide slurry by using the vibrating screen to obtain the filtered inorganic coated titanium dioxide slurry;
and 2, step: carrying out diaphragm washing on the filtered inorganic coated titanium dioxide slurry to obtain an inorganic coated titanium dioxide filter cake after diaphragm washing;
and step 3: drying and dehydrating the inorganic coated titanium dioxide filter cake to obtain dried inorganic coated titanium dioxide after drying and dehydration;
and 4, step 4: performing jet milling on the dried inorganic coated titanium dioxide to depolymerize the dried inorganic coated titanium dioxide to obtain depolymerized inorganic coated titanium dioxide;
and 5: and performing gravity settling on the depolymerized inorganic coated titanium dioxide, and enabling the inorganic coated titanium dioxide after the gravity settling to enter a packaging bin to obtain the titanium dioxide product.
4. The method for reducing agglomerated particles in a titanium dioxide product according to claim 3, wherein the viscosity of the inorganic coated titanium dioxide slurry is specified in a range of less than 200 centipoise.
5. The method for reducing agglomerated particles in a titanium dioxide product according to claim 4, wherein the specific resistance of the inorganic coated titanium dioxide filter cake after membrane washing is specified in a range of 80 Ω -m or more.
6. The method for reducing agglomerated particles in titanium dioxide products according to claim 5, wherein the moisture content of the dried inorganic coated titanium dioxide after drying and dehydration is specified to be less than or equal to 0.5%.
7. The method for reducing agglomerated particles in a titanium dioxide product according to claim 6, wherein the specified negative pressure range of the negative pressure of the system during jet milling is-1.6 KPa to-0.8 KPa; the specified pressure range of the steam pressure during jet milling is more than or equal to 2.0MPa; the ratio of the steam to the dried inorganic coated titanium dioxide during jet milling is specified to be in the range of 1.2-2.0.
8. The method for reducing agglomerated particles in titanium dioxide powder products according to claim 7, wherein in the step 5, the inorganic coated titanium dioxide powder after depolymerization is subjected to gravity settling through a flat pipe section of an air supply pipeline and a pipe perpendicular to the flat pipe section of the air supply pipeline.
9. The method for reducing agglomerated particles in titanium dioxide powder products according to claim 8, wherein the length of the flat pipe section of the air supply pipeline is 3-6 m, and the length of the pipe perpendicular to the flat pipe section of the air supply pipeline is 0.4-1.0 m.
10. The method for reducing agglomerated particles in titanium dioxide products according to claim 3, wherein flash drying is adopted for drying and dehydration in the step 3.
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