CN109607604B - Metatitanic acid bleaching system and method - Google Patents
Metatitanic acid bleaching system and method Download PDFInfo
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- CN109607604B CN109607604B CN201811533887.5A CN201811533887A CN109607604B CN 109607604 B CN109607604 B CN 109607604B CN 201811533887 A CN201811533887 A CN 201811533887A CN 109607604 B CN109607604 B CN 109607604B
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- metatitanic acid
- bleaching
- flue gas
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- sulfur
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- 239000002253 acid Substances 0.000 title claims abstract description 115
- 238000004061 bleaching Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000003546 flue gas Substances 0.000 claims abstract description 52
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000001354 calcination Methods 0.000 claims abstract description 46
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 43
- 239000011593 sulfur Substances 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 25
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 239000000779 smoke Substances 0.000 claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 11
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002918 waste heat Substances 0.000 claims abstract description 9
- 239000000428 dust Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 13
- 230000002829 reductive effect Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 238000011946 reduction process Methods 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 11
- 239000002994 raw material Substances 0.000 abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000004408 titanium dioxide Substances 0.000 abstract description 2
- 239000005864 Sulphur Substances 0.000 abstract 3
- 230000008676 import Effects 0.000 abstract 2
- 239000004411 aluminium Substances 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
- 230000002378 acidificating effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the technical field of titanium dioxide production, and particularly discloses a metatitanic acid bleaching system which is low in bleaching raw material consumption and free of extra steam energy consumption. The metatitanic acid bleaching system comprises a metatitanic acid bleaching tank, and further comprises a Venturi sprayer, a water re-spraying sprayer, an alkali liquor sprayer, an electrostatic demister and a smoke window which are sequentially connected; and the metatitanic acid bleaching tank is provided with a sulfur-containing calcining flue gas inlet and a tail gas outlet, and the tail gas outlet of the metatitanic acid bleaching tank is connected with the gas inlet of the Venturi sprayer. Through set up on metatitanic acid bleaching tank and contain sulphur calcination flue gas import and tail gas outlet, can let in the metatitanic acid bleaching tank with containing sulphur calcination flue gas from containing sulphur calcination flue gas import to utilize the waste heat to heat metatitanic acid and utilize acidity and reducing sulfide in the flue gas to reduce ferric iron in the metatitanic acid, can effectively reduce the bleaching metatitanic acid in-process to the quantity of bleaching raw materials such as sulphuric acid, aluminium powder, water, and need not to consume extra steam energy and heat.
Description
Technical Field
The invention belongs to the technical field of titanium dioxide production, and particularly relates to a metatitanic acid bleaching system and method.
Background
At present, metatitanic acid after being washed by water is bleached by a metatitanic acid bleaching tank, raw materials such as sulfuric acid, aluminum powder and water are required to be added in the bleaching process, and meanwhile, metatitanic acid in the metatitanic acid bleaching tank is heated to 60 ℃ by steam to reduce trivalent iron insoluble in water in metatitanic acid slurry. The existing method for bleaching metatitanic acid not only has more usage of bleaching raw materials such as sulfuric acid, aluminum powder and water, but also needs additional steam for heating, and has high energy consumption.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a metatitanic acid bleaching system which has less bleaching raw material consumption and does not need to consume additional steam energy.
The technical scheme adopted by the invention for solving the technical problems is as follows: the metatitanic acid bleaching system comprises a metatitanic acid bleaching tank, and further comprises a venturi tube dust remover, a water re-spraying device, an alkali liquor spraying device, an electrostatic demister and a smoke window which are sequentially connected; and a sulfur-containing calcining flue gas inlet and a tail gas outlet are formed in the metatitanic acid bleaching tank, and the tail gas outlet of the metatitanic acid bleaching tank is connected with the air inlet of the venturi dust remover.
Further, a tank bottom heating pipe is arranged in the metatitanic acid bleaching tank, and the sulfur-containing calcining flue gas inlet is an air inlet of the tank bottom heating pipe.
Further comprises a rotary kiln, a cyclone separator and a waste heat boiler which are connected in sequence; and an exhaust port of the waste heat boiler is connected with a sulfur-containing calcining flue gas inlet of the metatitanic acid bleaching tank.
Further, a stirring device is arranged in the metatitanic acid bleaching tank.
The invention also provides a metatitanic acid bleaching method, and the metatitanic acid bleaching system is used for bleaching metatitanic acid.
Further, the metatitanic acid bleaching method comprises the following steps:
adding metatitanic acid subjected to primary water washing into a metatitanic acid bleaching tank, and stirring the metatitanic acid at a stirring speed of 80-120 revolutions per minute;
secondly, introducing sulfur-containing calcining flue gas into a metatitanic acid bleaching tank from a sulfur-containing calcining flue gas inlet so as to heat metatitanic acid and reduce ferric iron in the metatitanic acid, wherein the reduction time is 90 minutes;
and step three, discharging water vapor and redundant sulfur-containing calcining flue gas generated in the reduction process from a tail gas outlet of the metatitanic acid bleaching tank, and discharging the water vapor and the redundant sulfur-containing calcining flue gas out of a smoke window after the water vapor and the redundant sulfur-containing calcining flue gas are sequentially treated by a venturi tube dust remover, a water re-spraying device, an alkali liquor spraying device and an electrostatic demister.
Further, the metatitanic acid bleaching method further comprises a fourth step;
and step four, transferring the reduced metatitanic acid into secondary washing equipment.
The invention has the beneficial effects that: the sulfur-containing calcining flue gas inlet and the tail gas outlet are arranged on the metatitanic acid bleaching tank, so that the sulfur-containing calcining flue gas can be introduced into the metatitanic acid bleaching tank from the sulfur-containing calcining flue gas inlet, the metatitanic acid is heated by using waste heat, and ferric iron in the metatitanic acid is reduced by using acidic and reductive sulfides in the flue gas, the use amount of bleaching raw materials such as sulfuric acid, aluminum powder and water in the metatitanic acid bleaching process can be effectively reduced, and extra steam energy is not required to be consumed for heating; the water vapor and the redundant sulfur-containing calcining flue gas generated in the bleaching process are discharged from a tail gas outlet of the metatitanic acid bleaching tank, and are discharged out of a smoke window after being sequentially treated by a venturi tube dust remover, a water re-spraying device, an alkali liquor sprayer and an electrostatic demister, so that pollutants are removed, and the environment is protected.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a metatitanic acid bleaching system of the present invention;
labeled as: metatitanic acid bleaching tank 10, sulfur-containing calcining flue gas inlet 11, tail gas outlet 12, venturi dust remover 20, water re-sprayer 30, alkali liquor sprayer 40, electrostatic demister 50, smoke window 60, rotary kiln 70, cyclone 80 and exhaust-heat boiler 90.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the metatitanic acid bleaching system comprises a metatitanic acid bleaching tank 10, and further comprises a venturi scrubber 20, a water re-sprayer 30, an alkali liquor sprayer 40, an electrostatic demister 50 and a smoke window 60 which are connected in sequence; the metatitanic acid bleaching tank 10 is provided with a sulfur-containing calcining flue gas inlet 11 and a tail gas outlet 12, and the tail gas outlet 12 of the metatitanic acid bleaching tank 10 is connected with an air inlet of a venturi dust collector 20.
A sulfur-containing calcining flue gas inlet 11 arranged on the metatitanic acid bleaching tank 10 is mainly used for introducing sulfur-containing calcining flue gas so as to heat metatitanic acid by using the waste heat of the sulfur-containing calcining flue gas and reduce ferric iron in metatitanic acid by using acid and reducing sulfide in the metatitanic acid; the sulfur-containing calcining flue gas inlet 11 is generally connected with an exhaust port of the rotary kiln system, and the sulfur-containing calcining flue gas exhausted by the rotary kiln system is generally at about 200 ℃. In order to facilitate heating and reduction, a flue gas duct is usually arranged in the metatitanic acid bleaching tank 10, the inlet end of the flue gas duct is connected with the sulfur-containing calcination flue gas inlet 11, and the exhaust end of the flue gas duct is generally below the liquid level line in the metatitanic acid bleaching tank 10. A tank bottom heating pipe is generally arranged in the metatitanic acid bleaching tank 10 and is originally used for introducing steam to heat metatitanic acid; for the sake of simplifying the structure, it is preferable to use the air inlet of the tank bottom heating pipe as the inlet 11 of the sulfur-containing calcining flue gas and use the tank bottom heating pipe as the flue gas conduit. A stirring device is generally arranged in the metatitanic acid bleaching tank 10 and is used for stirring metatitanic acid to facilitate full reaction.
Wherein, the venturi dust remover 20 is mainly used for removing dust in tail gas discharged from the metatitanic acid bleaching tank 10 and reducing the temperature of the tail gas; the water re-sprayer 30 is a spray dust remover and is mainly used for removing dust in the tail gas again and reducing the temperature of the tail gas; the alkali liquor sprayer 40 is mainly used for spraying alkali liquor to remove acid and reducing sulfide in the tail gas; the electrostatic demister 50 is mainly used for removing acid mist in the tail gas so that the tail gas meets the emission requirement, and is finally discharged to the atmosphere through the smoke window 60.
Preferably, as shown in fig. 1 again, the metatitanic acid bleaching system further comprises a rotary kiln 70, a cyclone separator 80 and a waste heat boiler 90 which are connected in sequence; the exhaust port of the waste heat boiler 90 is connected with the sulfur-containing calcining flue gas inlet 11 of the metatitanic acid bleaching tank 10.
The metatitanic acid bleaching method adopts any one of the metatitanic acid bleaching systems to carry out bleaching treatment on metatitanic acid.
The metatitanic acid bleaching method comprises the following steps:
adding metatitanic acid subjected to primary water washing into a metatitanic acid bleaching tank 10, and stirring the metatitanic acid at a stirring speed of 80-120 revolutions per minute;
secondly, introducing sulfur-containing calcining flue gas into a metatitanic acid bleaching tank 10 from a sulfur-containing calcining flue gas inlet 11 to heat metatitanic acid and reduce ferric iron in the metatitanic acid, wherein the reduction time is 90 minutes; the content of acidic and reductive sulfides in the sulfur-containing calcining flue gas is determinedThe flow rate of the introduced air flow is adjusted, and if the reduction requirement is not met, proper amount of bleaching raw materials such as sulfuric acid, aluminum powder, water and the like can be added; the equation for the reducing ion is: 2Fe3++SO3 2-+H2O＝2Fe2++SO4 2-+2H+；
And step three, discharging the water vapor and the redundant sulfur-containing calcining flue gas generated in the reduction process from a tail gas outlet 12 of the metatitanic acid bleaching tank 10, and discharging the water vapor and the redundant sulfur-containing calcining flue gas outside a smoke window 60 after the water vapor and the redundant sulfur-containing calcining flue gas are sequentially treated by a venturi tube dust remover 20, a water re-sprayer 30, an alkali liquor sprayer 40 and an electrostatic demister 50.
Preferably, the metatitanic acid bleaching method further comprises a fourth step;
and step four, transferring the reduced metatitanic acid into secondary washing equipment.
The bleaching method of the metatitanic acid provided by the invention is used for bleaching the metatitanic acid, so that on one hand, the usage amount of bleaching raw materials such as sulfuric acid, aluminum powder and water in the bleaching process can be effectively reduced, additional steam energy is not required to be consumed for heating, on the other hand, the sulfur-containing calcining flue gas can be fully utilized, the waste of heat of the sulfur-containing calcining flue gas and acidic and reductive substances in the sulfur-containing calcining flue gas is avoided, and the usage amount of water and alkali liquor for treating tail gas is reduced.
Examples
The bleaching process for a batch of metatitanic acid is as follows:
step one, adding metatitanic acid subjected to primary water washing into 40m according to the addition amount of 300g/L3In the metatitanic acid bleaching tank 10, a stirring device is started to stir metatitanic acid at a stirring speed of 120 revolutions per minute;
secondly, introducing sulfur-containing calcining flue gas into a metatitanic acid bleaching tank 10 from a sulfur-containing calcining flue gas inlet 11 to heat metatitanic acid and reduce ferric iron in the metatitanic acid, wherein the reduction time is 90 minutes;
step three, discharging water vapor and redundant sulfur-containing calcining flue gas generated in the reduction process from a tail gas outlet 12 of the metatitanic acid bleaching tank 10, and discharging the water vapor and the redundant sulfur-containing calcining flue gas outside a smoke window 60 after being sequentially treated by a venturi tube dust remover 20, a water re-sprayer 30, an alkali liquor sprayer 40 and an electrostatic demister 50;
and step four, transferring the reduced metatitanic acid into secondary washing equipment for secondary washing.
According to the test, the ferric iron in the metatitanic acid after the bleaching treatment is reduced to 30ppm from 800ppm before reduction, and the aim of reducing the ferric iron content in the metatitanic acid through bleaching is fulfilled.
Claims (6)
1. Metatitanic acid bleaching system, including metatitanic acid bleaching tank (10), its characterized in that: the device also comprises a venturi tube dust remover (20), a water re-spraying device (30), an alkali liquor spraying device (40), an electrostatic demister (50) and a smoke window (60) which are connected in sequence; a sulfur-containing calcining flue gas inlet (11) and a tail gas outlet (12) are arranged on the metatitanic acid bleaching tank (10), and the tail gas outlet (12) of the metatitanic acid bleaching tank (10) is connected with an air inlet of a venturi dust remover (20); a tank bottom heating pipe is arranged in the metatitanic acid bleaching tank (10), and the sulfur-containing calcining flue gas inlet (11) is an air inlet of the tank bottom heating pipe.
2. The metatitanic acid bleaching system of claim 1, wherein: the rotary kiln comprises a rotary kiln (70), a cyclone separator (80) and a waste heat boiler (90) which are connected in sequence; and an exhaust port of the waste heat boiler (90) is connected with a sulfur-containing calcining flue gas inlet (11) of the metatitanic acid bleaching tank (10).
3. The metatitanic acid bleaching system of claim 2, wherein: and a stirring device is arranged in the metatitanic acid bleaching tank (10).
4. The metatitanic acid bleaching method is characterized in that: bleaching metatitanic acid with the metatitanic acid bleaching system of any of claims 1 to 3.
5. A bleaching process according to claim 4, comprising the steps of:
adding metatitanic acid subjected to primary water washing into a metatitanic acid bleaching tank (10), and stirring the metatitanic acid at a stirring speed of 80-120 revolutions per minute;
secondly, introducing sulfur-containing calcining flue gas into a metatitanic acid bleaching tank (10) from a sulfur-containing calcining flue gas inlet (11) to heat metatitanic acid and reduce ferric iron in metatitanic acid at the same time, wherein the reduction time is 90 minutes;
and step three, discharging the water vapor and the redundant sulfur-containing calcining flue gas generated in the reduction process from a tail gas outlet (12) of the metatitanic acid bleaching tank (10), and discharging the water vapor and the redundant sulfur-containing calcining flue gas out of a smoke window (60) after being treated by a venturi tube dust remover (20), a water re-spraying device (30), an alkali liquor spraying device (40) and an electrostatic demister (50) in sequence.
6. The bleaching process of metatitanic acid according to claim 5, wherein: the method also comprises a fourth step;
and step four, transferring the reduced metatitanic acid into secondary washing equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811533887.5A CN109607604B (en) | 2018-12-14 | 2018-12-14 | Metatitanic acid bleaching system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811533887.5A CN109607604B (en) | 2018-12-14 | 2018-12-14 | Metatitanic acid bleaching system and method |
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| CN109607604B true CN109607604B (en) | 2021-09-14 |
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| CN102634662B (en) * | 2012-04-26 | 2013-07-31 | 浙江华友钴业股份有限公司 | Method for low-temperature deironing by using mixed gas of air and sulfur dioxide (SO2) |
| CN103553123B (en) * | 2013-10-18 | 2015-09-30 | 中国有色集团（广西）平桂飞碟股份有限公司 | The bleaching method of metatitanic acid in a kind of Titanium White Production By Sulfuric Acid Process |
| CN104477985A (en) * | 2014-12-04 | 2015-04-01 | 攀钢集团钛业有限责任公司 | Bleaching method used in production of titanium dioxide powder by sulfuric acid process |
| CN105621478B (en) * | 2015-12-31 | 2018-03-13 | 攀枝花东方钛业有限公司 | A kind of ion method of metatitanic acid in sulfuric acid method titanium pigment production |
| CN107760883B (en) * | 2017-10-23 | 2020-01-17 | 金川集团股份有限公司 | Method for rapidly removing iron from nickel-cobalt solution by using sulfur dioxide and air mixed gas |
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Denomination of invention: Titanic acid bleaching system and method Effective date of registration: 20231207 Granted publication date: 20210914 Pledgee: Agricultural Bank of China Limited Miyi County Branch Pledgor: PANZHIHUA DONGFANG TITANIUM INDUSTRY CO.,LTD. Registration number: Y2023980069498 |