CN115851000A - Method and device for drying titanium dioxide filter cake by contact change promotion - Google Patents
Method and device for drying titanium dioxide filter cake by contact change promotion Download PDFInfo
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- CN115851000A CN115851000A CN202211557213.5A CN202211557213A CN115851000A CN 115851000 A CN115851000 A CN 115851000A CN 202211557213 A CN202211557213 A CN 202211557213A CN 115851000 A CN115851000 A CN 115851000A
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- Prior art keywords
- filter cake
- titanium dioxide
- filter
- thixotropic
- drying
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000012065 filter cake Substances 0.000 title claims abstract description 51
- 238000001035 drying Methods 0.000 title claims abstract description 33
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000008859 change Effects 0.000 title description 4
- 230000009974 thixotropic effect Effects 0.000 claims abstract description 21
- 238000005406 washing Methods 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000000889 atomisation Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000007790 scraping Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims 2
- 238000011085 pressure filtration Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000001704 evaporation Methods 0.000 abstract description 8
- 230000008020 evaporation Effects 0.000 abstract description 8
- 238000001694 spray drying Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 235000010215 titanium dioxide Nutrition 0.000 abstract 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
The invention discloses a method and a device for drying a titanium white filter cake by touch-trigger, which relate to the technical field of titanium white production and comprise inorganic coating and washing operations, wherein the pH value of the end point of the washing operation is controlled to be 4-6 or 8-10, the filter cake obtained by filter pressing is transferred to an oscillator through a belt, and after the filter cake is thixotropic to the maximum extent, the thixotropic filter cake is atomized and dried to obtain the titanium white. The invention overcomes the defect that the thixotropic filter cake can not be dried by a flash evaporation process by improving the thixotropy of the filter cake, utilizing the characteristic of thixotropic thinning and adopting a spray drying process. The invention integrates the advantages of dispersibility of the thixotropic filter cake and fluidity of spray drying, and greatly improves the application performance and quality stability of the produced titanium dioxide.
Description
Technical Field
The invention relates to the technical field of titanium dioxide production, in particular to a method and a device for drying a titanium dioxide filter cake by promoting touch change.
Background
Titanium dioxide is one of white pigments with the strongest tinting strength, has high whiteness, good covering power, strong tinting strength and good dispersibility, is a very important raw material in industrial production, and is widely applied to the industries of coatings, plastics, papermaking, printing ink, chemical fibers, rubber, cosmetics, ceramics, enamel, electronics, food, medicine and the like.
In the post-treatment process of the existing titanium dioxide production, inorganic coating is needed to achieve better pigment performance, water-soluble salt is washed off firstly after general coating, the pH value of the water-soluble salt is about neutral (between 6 and 8), the later thixotropy is reduced, then filter cakes are obtained after filter pressing, and then the filter cakes are dried and crushed to obtain the finished titanium dioxide. However, the slightly different coating process, washing degree and pH value of the coated filter cake may cause thixotropy of the filter cake, which directly affects whether the production can be normally carried out. The reason is that flash evaporation drying is mostly adopted in the drying process of the titanium dioxide, if the filter cake is thixotropic, the filter cake is sticky or even becomes thin water in the subsequent belt conveying process due to mechanical vibration, the filter cake can be adhered to a belt or a flash evaporation spiral stirrer to influence the production efficiency if the filter cake is light, and flash evaporation flameout can be caused seriously to stop the post-treatment production of the titanium dioxide. Therefore, a new drying process needs to be developed to ensure the normal production.
Disclosure of Invention
The invention provides a method and a device for drying a titanium dioxide filter cake by promoting touch change, which innovatively utilize thixotropy of the filter cake to carry out subsequent operation and solve the technical problem that production efficiency is influenced and even flash evaporation and flameout are caused by thixotropy of the filter cake in the prior art.
The technical scheme adopted by the invention is as follows:
a method for drying titanium dioxide filter cakes by contact-promoting comprises the steps of inorganic coating and washing, wherein the pH value of the end point of the washing is controlled to be 4-6 or 8-10, the filter cakes obtained by filter pressing are transferred to an oscillator through a belt, and after the filter cakes are thixotropic to the maximum extent, the thixotropic filter cakes are atomized and dried to obtain the titanium dioxide.
The thixotropic is that the filter cake promotes the breakage of partial chemical bond structures in the filter cake under the action of external force, so that the coagulation effect among filter cake particles is reduced, and the dispersion of titanium dioxide is facilitated.
Preferably, the solid content of the filter cake obtained by the filter pressing is 60-80%.
The device adopted by the method comprises the following steps: the device comprises a filter press and atomization drying equipment, wherein a belt conveyor is arranged below the filter press, an oscillator is arranged below a terminal end of the belt conveyor, a hopper is placed on the oscillator, and a feeding pipe is connected between the hopper and the atomization drying equipment.
Preferably, the atomization drying device comprises a drying tower and a centrifugal rotary atomizer.
Preferably, the hopper is provided with a scraping blade for scraping off adhesive substances on the belt.
Preferably, a hopper is placed on the belt.
Preferably, a material pump convenient for material conveying is arranged on the feeding pipe.
In summary, compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention overcomes the defect that the thixotropic filter cake can not be dried by a flash evaporation process by improving the thixotropy of the filter cake, utilizing the characteristic of thixotropic thinning and adopting a spray drying process.
2. The invention integrates the dispersibility of the thixotropic filter cake and the fluidity advantage of spray drying, so that the application performance and the quality stability of the produced titanium dioxide are greatly improved;
3. the solid content of the filter cake to be dried of the invention reaches about 70 percent, and the defect of low thermal efficiency of spray drying can be improved.
Drawings
FIG. 1 is a schematic view of the structure of an apparatus used in embodiment 1 of the present invention;
the labels in the figure are respectively: 1. a filter press; 2. a belt conveyor; 3. a hopper; 31. scraping a blade; 4. an oscillator; 5. a feed pipe; 6. a pump; 7. a centrifugal rotary atomizer; 8. a hot air pipe; 9. and (7) drying the tower.
Detailed Description
In order to better understand the present invention, the following embodiments and the accompanying drawings further illustrate the present invention, but should not be understood as the definition of the invention, and the technicians in this field according to the invention of the non-essential modification and adjustment, also considered to fall within the protection scope of the invention.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The device disclosed by the invention adopts a device shown in figure 1 for filtering, thixotropic property and drying, and comprises a filter press 1 and an atomization drying device, wherein a belt conveyor 2 is arranged below the filter press 1, an oscillator 4 is arranged below the terminal end of the belt conveyor 2, a hopper 3 is arranged on the oscillator 4, and a feeding pipe 5 is connected between the hopper 3 and the atomization drying device.
Furthermore, the atomization drying equipment comprises a drying tower 9 and a centrifugal rotary atomizer 7, materials enter the centrifugal rotary atomizer 7 through a feeding pipe 5, the side edge of the centrifugal rotary atomizer 7 is connected with a hot air pipe 8, then the materials and hot air enter the drying tower 9 at the lower end of the centrifugal rotary atomizer 7 for drying, and finally dried titanium dioxide is turned out through a bottom outlet of the drying tower 9.
In order to avoid that a part of thixotropic materials are adhered to the belt of the belt conveyor 2, so that the materials are wasted or the production is influenced, the embodiment adopts a mode that the scraping blade 31 is arranged at the contact position of the hopper 3 and the belt, and the expectation of the adhered belt is scraped into the hopper 3. Of course, the hopper may be placed on a belt and removed from storage or directly replaced on the shaker 4 after the belt is transported to the end point.
In order to smoothly convey the material to the centrifugal rotary atomizer 7, a pump 6 is also provided in this embodiment.
Example 1
In this embodiment, before entering a filter press, inorganic coating and water washing operations are performed, wherein the end point pH value of the water washing operation is controlled to be 4 to 6, the solid content of a filter cake obtained by filter pressing is 60 to 80%, the filter cake is transferred to an oscillator through a belt, after the filter cake is thixotropic to the maximum extent, the thixotropic filter cake is subjected to atomization drying to obtain titanium dioxide, the dispersibility of the titanium dioxide is 50 to 70bar/g as measured by a 1400-mesh filter screen, the requirement of high-dispersibility titanium dioxide is met, the phenomenon of blockage of the feeding of the dryer does not exist, the production can be continuously performed, the atomized particles are small, and the dry fast natural gas consumption per ton is 30 to 35Nm 3 The end point water consumption is low, and each ton of titanium dioxide needs 30-33 tons of water.
Example 2
In this example, before entering the filter press, the inorganic coating and water washing operation is performed, wherein the end point pH value of the water washing operation is controlled to be 8-10, the solid content of the filter cake obtained by filter pressing is 60-80%, the filter cake is transferred to the oscillator through the belt, and the filter cake is filteredAfter the cake is thixotropic to the maximum extent, carrying out atomization drying on the thixotropic filter cake to obtain titanium dioxide, wherein the filter pressing value of the titanium dioxide is 50-70bar/g when the dispersity is measured by a 1400-mesh filter screen, the requirement of the titanium dioxide with high dispersity is met, the phenomenon of feeding blockage of a dryer does not exist, the production can be continuously carried out, the atomized particles are small, and the dry and rapid natural gas consumes 30-35 Nm/ton 3 And the end point water consumption is low, and each ton of titanium dioxide needs 30-33 tons of water.
Comparative example 1
In this embodiment, before entering a filter press, inorganic coating and water washing operations are performed, wherein the end point pH value of the water washing operation is controlled to be 6 to 8, the solid content of a filter cake obtained by filter pressing is 60 to 80%, the filter cake is transferred to flash evaporation drying equipment through a belt to obtain titanium dioxide, but when thixotropic conditions exist, the filter cake cannot enter the flash evaporation drying equipment, so that the production capacity is reduced, even the production is stopped, the dispersibility of the produced titanium dioxide is 150 to 170bar/g, the dispersibility is general, and the natural gas consumption per ton is 55 to 67Nm 3 The energy consumption is high, the end point water consumption is large, and each ton of titanium dioxide needs 50-63 tons of water.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (7)
1. A method for drying titanium dioxide filter cakes by contact-promoting comprises inorganic coating and washing operations, and is characterized in that the pH value of the end point of the washing operation is controlled to be 4-6 or 8-10, filter cakes obtained by filter pressing are transferred to an oscillator through a belt, and after the filter cakes are thixotropic to the maximum extent, the thixotropic filter cakes are atomized and dried to obtain the titanium dioxide.
2. The process for touch-activated titanium dioxide filter cake drying according to claim 1, wherein said filter cake obtained by pressure filtration has a solids content of 60 to 80%.
3. A device for use in a method of touch-activated titanium dioxide filter cake drying as claimed in claim 1 or claim 2, wherein: the device comprises a filter press and atomization drying equipment, wherein a belt conveyor is arranged below the filter press, an oscillator is arranged below a terminal end of the belt conveyor, a hopper is placed on the oscillator, and a feeding pipe is connected between the hopper and the atomization drying equipment.
4. The apparatus of claim 3, wherein: the atomization drying equipment comprises a drying tower and a centrifugal rotary atomizer.
5. The apparatus of claim 3, wherein: and the hopper is provided with a scraping blade for scraping off adhesive substances on the belt.
6. The apparatus of claim 3, wherein: a hopper is arranged on the belt.
7. The apparatus of claim 3, wherein: and the feeding pipe is provided with a material pump which is convenient for conveying materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211557213.5A CN115851000A (en) | 2022-12-06 | 2022-12-06 | Method and device for drying titanium dioxide filter cake by contact change promotion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211557213.5A CN115851000A (en) | 2022-12-06 | 2022-12-06 | Method and device for drying titanium dioxide filter cake by contact change promotion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115851000A true CN115851000A (en) | 2023-03-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211557213.5A Pending CN115851000A (en) | 2022-12-06 | 2022-12-06 | Method and device for drying titanium dioxide filter cake by contact change promotion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115851000A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2494131A1 (en) * | 1980-11-20 | 1982-05-21 | Somac | Processing and drying thixotropic prod. contg. solid impurities - e.g. calcium hydroxide, by kneading, homogenising, filtering or sieving and drying |
| US4527746A (en) * | 1982-04-07 | 1985-07-09 | Bayer Aktiengesellschaft | Process for preparing granules of water-insoluble solids |
| US4580732A (en) * | 1982-03-04 | 1986-04-08 | Mantell Myron E | Filter cake processing method and mechanism |
| US5174817A (en) * | 1989-06-29 | 1992-12-29 | Bayer Aktiengesellschaft | Process for the calcination of filter cakes with high solids contents being partly pre-dried in a directly heated rotary kiln |
| JPH09301715A (en) * | 1996-05-13 | 1997-11-25 | Showa Denko Kk | Production of titanium dioxide pigment |
| JPH1034195A (en) * | 1996-07-25 | 1998-02-10 | Honda Motor Co Ltd | Method for drying high water content industrial waste |
| CN1213659A (en) * | 1998-09-11 | 1999-04-14 | 清华大学 | Superfine titanium white surface cladding tech. and reactor thereof |
| JP2002119999A (en) * | 2000-10-17 | 2002-04-23 | Astec Irie Co Ltd | Method and equipment for drying treatment of dehydrated cake |
| CN111471325A (en) * | 2020-05-11 | 2020-07-31 | 华东理工大学 | Method for improving fluidity of titanium dioxide for chinlon chemical fiber |
| CN115260795A (en) * | 2022-08-26 | 2022-11-01 | 攀钢集团重庆钛业有限公司 | Method for reducing agglomerated particles in titanium dioxide product |
-
2022
- 2022-12-06 CN CN202211557213.5A patent/CN115851000A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2494131A1 (en) * | 1980-11-20 | 1982-05-21 | Somac | Processing and drying thixotropic prod. contg. solid impurities - e.g. calcium hydroxide, by kneading, homogenising, filtering or sieving and drying |
| US4580732A (en) * | 1982-03-04 | 1986-04-08 | Mantell Myron E | Filter cake processing method and mechanism |
| US4527746A (en) * | 1982-04-07 | 1985-07-09 | Bayer Aktiengesellschaft | Process for preparing granules of water-insoluble solids |
| US5174817A (en) * | 1989-06-29 | 1992-12-29 | Bayer Aktiengesellschaft | Process for the calcination of filter cakes with high solids contents being partly pre-dried in a directly heated rotary kiln |
| JPH09301715A (en) * | 1996-05-13 | 1997-11-25 | Showa Denko Kk | Production of titanium dioxide pigment |
| JPH1034195A (en) * | 1996-07-25 | 1998-02-10 | Honda Motor Co Ltd | Method for drying high water content industrial waste |
| CN1213659A (en) * | 1998-09-11 | 1999-04-14 | 清华大学 | Superfine titanium white surface cladding tech. and reactor thereof |
| JP2002119999A (en) * | 2000-10-17 | 2002-04-23 | Astec Irie Co Ltd | Method and equipment for drying treatment of dehydrated cake |
| CN111471325A (en) * | 2020-05-11 | 2020-07-31 | 华东理工大学 | Method for improving fluidity of titanium dioxide for chinlon chemical fiber |
| CN115260795A (en) * | 2022-08-26 | 2022-11-01 | 攀钢集团重庆钛业有限公司 | Method for reducing agglomerated particles in titanium dioxide product |
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