CN106044708A - Method for comprehensively utilizing chlorination tail gas in chlorination-process titanium dioxide powder production procedures - Google Patents
Method for comprehensively utilizing chlorination tail gas in chlorination-process titanium dioxide powder production procedures Download PDFInfo
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- CN106044708A CN106044708A CN201610364138.9A CN201610364138A CN106044708A CN 106044708 A CN106044708 A CN 106044708A CN 201610364138 A CN201610364138 A CN 201610364138A CN 106044708 A CN106044708 A CN 106044708A
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- hydrochloric acid
- hydrogen chloride
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- dilute hydrochloric
- desorption tower
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/03—Preparation from chlorides
- C01B7/035—Preparation of hydrogen chloride from chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
Abstract
The invention relates to a method for treating chlorination tail gas in chlorination-process titanium dioxide powder production procedures. Carbon monoxide in the chlorination tail gas can be used as a heat source, and byproduct hydrochloric acid which is obtained after the chlorination tail gas is subjected to acid pickling can be desorbed to obtain high-purity hydrogen chloride by the aid of the method. The method includes carrying out acid pickling and alkali washing on the chlorination tail gas, then combusting the chlorination tail gas in a combustion furnace, feeding generated hot flue gas into a reboiler and ultimately venting the flue gas; filtering the byproduct hydrochloric acid obtained after the chlorination tail gas is subjected to acid picking, carrying out heat exchange on the byproduct hydrochloric acid, then feeding the byproduct hydrochloric acid into a desorption tower, continuously heating and evaporating the byproduct hydrochloric acid by the aid of a reboiler to obtain hydrogen chloride gas, exhausting the hydrogen chloride gas from the top of the desorption tower and draining evaporated diluted hydrochloric acid from the bottom of the desorption tower; carrying out heat exchange on the diluted hydrochloric acid by the aid of a double-effect heat exchanger and cooling the diluted hydrochloric acid until the temperature of the diluted hydrochloric acid reaches the normal temperature; condensing the hydrogen chloride gas to obtain high-purity hydrogen chloride gas. The method has the advantages that carbon resources can be effectively utilized; the recycled hydrochloric acid can be converted into the high-purity hydrogen chloride, and accordingly the resource utilization rate can be increased; the desorbed diluted hydrochloric acid is used as acid pickling absorption liquid, accordingly, the recycling rate of the byproduct hydrochloric acid can be increased, discharge pressures can be relieved, and the production cost can be lowered.
Description
Technical field
The present invention relates to a kind of exhaust gas treating method, chlorinated exhaust in a kind of Titanium Dioxide Produced by Chloride Procedure production process
Processing method.
Background technology
Titanium dioxide is a kind of white inorganic pigment, has optimal opacity, optimal whiteness and brightness and nontoxic etc.
Characteristic, being recognized is the Chinese white that at present performance is best in the world, be widely used in coating, plastics, papermaking, printing-ink,
The industry such as chemical fibre, rubber, cosmetics.
After richness titanium material is mainly mixed by chloridising production titanium dioxide with petroleum coke, chlorination furnace carries out chlorination anti-
Should, generate the mixture containing titanium tetrachloride, from chlorination furnace top mixture out through cyclone dust extractor separation slag, dirt,
To crude titanic chloride；Make contained VOCl in crude titanic chloride3React except vanadium in impurity and mineral oil etc., and after rectification, obtain smart four
Titanium chloride；Refined titanic chloride at high temperature generates titanium dioxide base material with oxygen reaction, then obtains the gold of top grade through post processing
Red stone-type titanium dioxide.Wherein chlorination reaction principle is as follows:
TiO2+2C+2Cl2→TiCl4+2CO (1)
TiO2+C+2Cl2→TiCl4+CO2 (2)
In chlorination reaction process, substantial amounts of CO and CO can be generated2Gas, due to technology controlling and process difference, reaction generates
CO and CO2Proportion is different, typically containing 30-50%CO in chlorinated exhaust.Except containing a large amount of CO, CO in chlorinated exhaust2
Outward, possibly together with a small amount of HCl and unreacted Cl2Deng, chlorinated exhaust processing system need to be delivered to and process further.At present to chlorination tail
Gas processes generally by pickling, alkali cleaning, or is processed by washing, alkali cleaning.First pass through pickling or washing removes
Go the wherein sour gas such as HCl to generate by-product hydrochloric acid, process chlorine in waste gas by alkali cleaning the most again.Generation by-product hydrochloric acid is general
It is to enter Waste Water Treatment, by returning chlorination slurrying after neutralizing, precipitate, filtering.Or by-product hydrochloric acid is filtered, no
Recycle after molten thing precipitation；Filtrate refilters after adjusting pH, and the filtrate obtained is evaporated concentrating, it is thus achieved that side-product chloride,
The steam produced in evaporation process is condensed, obtains high-purity hydrochloric acid.Chinese invention patent such as Publication No. 103432867A
Application discloses the method for comprehensive utilization of chlorination drip washing the produced waste hydrochloric acid of tail gas process, chlorine during a kind of Titanium Dioxide Produced by Chloride Procedure produces
Changing tail gas by washing, empty after alkali cleaning, the spent acid that washing obtains filters, neutralizes, refilters, evaporation and concentration obtains high-purity
Hydrochloric acid.Either pickling, alkali cleaning, or washing, the processing method of alkali cleaning, the carbon monoxide contained in the tail gas after purified treatment
It is not utilized effectively, empties after directly discharging with tail gas or burn, and the combustion heat does not obtains Appropriate application, causes carbon resource
Waste.
Summary of the invention
The technical problem to be solved is to provide combining of chlorinated exhaust in a kind of Titanium Dioxide Produced by Chloride Procedure production process
Close Application way, it is possible to utilize the carbon monoxide in chlorinated exhaust as thermal source, by-product hydrochloric acid chlorinated exhaust pickling obtained
De-analysis obtains high-purity hydrogen chloride.
The technical solution adopted for the present invention to solve the technical problems is: chlorinated exhaust in Titanium Dioxide Produced by Chloride Procedure production process
Method of comprehensive utilization, comprise the following steps:
(1) chlorinated exhaust produced in Titanium Dioxide Produced by Chloride Procedure production process is passed through pickling tower, obtains by-product hydrochloric acid；Pickling
Later tail gas is passed through caustic wash tower, and the tail gas after alkali cleaning enters combustion furnace burning, and burning generates heat smoke and mixes air cooling
Hydrochloric acid during the heating of entrance reboiler is desorption tower used after 200-250 DEG C, finally empties；
(2) by-product hydrochloric acid that chlorinated exhaust pickling obtains obtains concentration after by-product hydrochloric acid filter tank filters is 25-
The hydrochloric acid of 30% enters by-product hydrochloric acid storage tank, after the hydrochloric acid in by-product hydrochloric acid storage tank is by transport pump to double-effect heat exchanger heat exchange, from
Desorption tower used top enters desorption tower used, and hydrochloric acid interior is evaporated hydrogen chloride gas by desorption tower used top by reboiler laser heating desorption tower used
Portion discharges, and the dilute hydrochloric acid obtained after evaporation is discharged by desorption tower used bottom；
(3) dilute hydrochloric acid that desorption tower used bottom is discharged enters double-effect heat exchanger and the hydrochloric acid heat exchange from by-product hydrochloric acid storage tank
After, enter back into the cooling of dilute hydrochloric acid the second cooler, enter dilute hydrochloric acid filter tank after being cooled to room temperature and filter, be then fed into dilute hydrochloric acid
Storage tank；
(4) hydrogen chloride gas that desorption tower used top is discharged obtains purity after sending into hydrogen chloride cooler condensation is 99-99.5%
High-purity hydrogen chloride gas, the dilute hydrochloric acid condensed out in hydrogen chloride cooler send into dilute hydrochloric acid storage tank.
Preferably, the hydrochloric acid temperature in by-product hydrochloric acid storage tank described in step (2) is 20-30 DEG C, changes through double-effect heat exchanger
After heat, temperature is 60-70 DEG C.
Preferably, the dilute hydrochloric acid concentration described in step (2) is 19-22%.
Preferably, the hydrogen chloride cooler described in step (4) includes that hydrogen chloride the first cooler and hydrogen chloride second cool down
Device, the recirculated water that cooling medium is 30 DEG C of hydrogen chloride the first cooler, the cooling medium of hydrogen chloride the second cooler is 5 DEG C
Recirculated water, reduces to 10-15 DEG C through hydrogen chloride the second cooler cooling afterchlorinate hydrogen temperature.
Preferably, the dilute hydrochloric acid temperature that in step (3), desorption tower used bottom is discharged is 105-115 DEG C, changes through double-effect heat exchanger
After heat, temperature reduces to 40-50 DEG C.
Preferably, after in step (3), the dilute hydrochloric acid in dilute hydrochloric acid storage tank is cooled down by transport pump to dilute hydrochloric acid the 3rd cooler
Delivering to the cooling of dilute hydrochloric acid the 4th cooler again, dilute hydrochloric acid temperature is down to 5-10 DEG C, then is absorbed as pickling by being pumped to pickling tower
Liquid；The described recirculated water that dilute hydrochloric acid the 3rd cooler cooling medium is 5 DEG C, dilute hydrochloric acid the 4th cooler cooling medium is-25
DEG C chilled brine.
Preferably, the hydrogen chloride cooler condensed high-purity hydrogen chloride gas purity described in step (4) is 99%.
The invention has the beneficial effects as follows: the thermal source that the carbon monoxide in chlorinated exhaust takes off analysis as hydrochloric acid is produced by the present invention
High-purity hydrogen chloride, it is therefore prevented that the waste of carbon resource, it is achieved that effective utilization of carbon resource；Reclaim hydrochloric acid and be converted into high-purity chlorination
Hydrogen, decreases the discharge capacity of waste water, reduces the pressure of sewage disposal system, improves resource utilization；Dilute salt after de-analysis
Acid return pickling tower, as pickling absorbing liquid, recycles, improves the by-product hydrochloric acid response rate, reduce discharge pressure and production
Cost.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
Detailed description of the invention
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
As it is shown in figure 1, the method for comprehensive utilization of chlorinated exhaust in the Titanium Dioxide Produced by Chloride Procedure production process of the present invention, including with
Lower step:
(1) chlorinated exhaust produced in Titanium Dioxide Produced by Chloride Procedure production process is passed through pickling tower, obtains by-product hydrochloric acid；Pickling
Later tail gas is passed through caustic wash tower, and the tail gas after alkali cleaning enters combustion furnace burning, and burning generates heat smoke and mixes air cooling
Hydrochloric acid during the heating of entrance reboiler is desorption tower used after 200-250 DEG C, finally empties；
(2) by-product hydrochloric acid that chlorinated exhaust pickling obtains obtains concentration after by-product hydrochloric acid filter tank filters is 25-
The hydrochloric acid of 30% enters by-product hydrochloric acid storage tank, after the hydrochloric acid of by-product hydrochloric acid storage tank is by transport pump to double-effect heat exchanger heat exchange, from de-
Analysis tower top enters desorption tower used, and hydrochloric acid interior is evaporated hydrogen chloride gas by desorption tower used top by reboiler laser heating desorption tower used
Discharging, the dilute hydrochloric acid obtained after evaporation is discharged by desorption tower used bottom；
(3) dilute hydrochloric acid that desorption tower used bottom is discharged enters double-effect heat exchanger and the hydrochloric acid heat exchange from by-product hydrochloric acid storage tank
After, enter back into the cooling of dilute hydrochloric acid the second cooler, enter dilute hydrochloric acid filter tank after being cooled to room temperature and filter, be then fed into dilute hydrochloric acid
Storage tank；
(4) hydrogen chloride gas that desorption tower used top is discharged obtains purity after sending into hydrogen chloride cooler condensation is 99-99.5%
High-purity hydrogen chloride gas, the dilute hydrochloric acid condensed out in hydrogen chloride cooler send into dilute hydrochloric acid storage tank.
Containing HCl, TiCl in chlorinated exhaust4、CO、CO2、N2, chlorine, a small amount of SiCl4Deng, will wherein through overpickling tower
HCl、TiCl4、SiCl4Removing, tail gas after pickling enters caustic wash tower, alkali cleaning remove chlorine therein and not acid washed fall
The sour gas such as trace HCl, the tail gas of purification enters combustion furnace and is flared off CO.
Containing TiCl in the by-product hydrochloric acid that chlorinated exhaust pickling obtains4、SiCl4Hydrolysis produces TiOCl2、H4SiO4Deng solid
Impurity, removes solid impurity after spent acid filter tank filters, and obtains the hydrochloric acid that concentration is 25-30% and enters by-product hydrochloric acid storage
Groove.Hydrochloric acid temperature in by-product hydrochloric acid storage tank is 20-30 DEG C, and after double-effect heat exchanger heat exchange, temperature is heated to be 60-70 DEG C；Heating
Hydrochloric acid is conducive to hydrochloric acid at the raw hydrogen chloride gas of desorption tower used interior de-division, reduces the load of reboiler, it is achieved that heat energy comprehensive
Utilize.Hydrochloric acid enters from desorption tower used top and desorption tower used flows from top to bottom, with enter from reboiler desorption tower used from bottom to top
Hydrogen chloride gas carries out mass-and heat-transfer process, and reboiler makes hydrochloric acid by the way of the heat smoke laser heating that exhaust combustion produces
Constantly evaporate hydrogen chloride gas, it is ensured that mass-and heat-transfer process is persistently carried out at packing layer.During mass-and heat-transfer, hydrogen chloride
Gradually volatilizing, concentration is gradually lowered from top to bottom；And hydrogen chloride gas is in uphill process, make that carries to satisfy owing to temperature reduces
With steam gradually condensation liquefaction；Hydrogen chloride gas is discharged at final desorption tower used top, and dilute salt that concentration is 19-22% is discharged in bottom
Acid.
After hydrogen chloride gas autospasy analysis column overhead is discharged, successively enter hydrogen chloride the first cooler and hydrogen chloride second cools down
Device condenses, the recirculated water that cooling medium is 30 DEG C of hydrogen chloride the first cooler, and the cooling of hydrogen chloride the second cooler is situated between
Matter is the recirculated water of 5 DEG C, reduces to 10-15 DEG C through hydrogen chloride the second cooler cooling afterchlorinate hydrogen temperature, and purity reaches 99%.
The dilute hydrochloric acid temperature that desorption tower used bottom is discharged is 105-115 DEG C, through double-effect heat exchanger and from by-product hydrochloric acid storage tank
In the hydrochloric acid heat exchange that temperature is 20-30 DEG C after temperature reduce to 40-50 DEG C, then enter back into hydrochloric acid the second cooler cooling, cold
But to room temperature, enter the filtration of dilute hydrochloric acid filter tank, be then fed into dilute hydrochloric acid storage tank；Dilute hydrochloric acid in dilute hydrochloric acid storage tank is defeated by pump
Delivering to the cooling of dilute hydrochloric acid the 4th cooler after delivering to the cooling of dilute hydrochloric acid the 3rd cooler again, dilute hydrochloric acid temperature is down to 5-10 DEG C, then
By being pumped to pickling tower as pickling absorbing liquid；The described recirculated water that dilute hydrochloric acid the 3rd cooler cooling medium is 5 DEG C, dilute salt
Acid the 4th cooler cooling medium is the chilled brine of-25 DEG C.Double-effect heat exchanger is heat energy comprehensive utilization device, both increased into
Enter the temperature of desorption tower used hydrochloric acid, reduce again the temperature of desorption tower used bottom dilute hydrochloric acid out, decrease finishing operations and heat up
Or the energy expenditure of cooling, reach energy-saving and cost-reducing purpose.Dilute hydrochloric acid temperature is down to 5-10 DEG C, then delivers to pickling tower conduct
Pickling absorbing liquid so that the good absorbing effect of pickling tower, improves by-product hydrochloric acid utilization rate, efficiently solves pickling effect simultaneously
The problem that difference causes alkali cleaning comparatively high consumption.
Embodiment 1:
The chlorinated exhaust produced in Titanium Dioxide Produced by Chloride Procedure production process is passed through pickling tower, obtains by-product hydrochloric acid；Pickling
After tail gas be passed through caustic wash tower, tail gas after alkali cleaning enters combustion furnace burning, and burning generates heat smoke and mixes air and be cooled to
Hydrochloric acid during the heating of entrance reboiler is desorption tower used after about 250 DEG C, finally empties；The by-product hydrochloric acid warp that chlorinated exhaust pickling obtains
Cross and after by-product hydrochloric acid filter tank filters, obtain the hydrochloric acid entrance by-product hydrochloric acid storage tank that concentration is about 25%, in by-product hydrochloric acid storage tank
Hydrochloric acid by transport pump to double-effect heat exchanger heat exchange after, temperature is increased to 70 DEG C by 30 DEG C, then enters de-analysis from desorption tower used top
Tower, hydrochloric acid interior evaporated hydrogen chloride gas by reboiler laser heating desorption tower used and is discharged by desorption tower used top, obtains after evaporation
Dilute hydrochloric acid concentration be 19%, temperature be 115 DEG C, desorption tower used bottom discharge；The dilute hydrochloric acid that desorption tower used bottom is discharged enters double
Effect heat exchanger reduces to 50 DEG C with temperature after the hydrochloric acid heat exchange of by-product hydrochloric acid storage tank, enters back into dilute hydrochloric acid the second cooler cold
But, enter dilute hydrochloric acid filter tank after being cooled to room temperature and filter, be then fed into dilute hydrochloric acid storage tank；The hydrogen chloride that desorption tower used top is discharged
After gas sends into hydrogen chloride cooler condensation, temperature reduces to 15 DEG C, obtains the high-purity hydrogen chloride gas that purity is 99%, and chlorination is hydrogen-cooled
But the dilute hydrochloric acid condensed out in device sends into dilute hydrochloric acid storage tank.
Embodiment 2:
The chlorinated exhaust produced in Titanium Dioxide Produced by Chloride Procedure production process is passed through pickling tower, obtains by-product hydrochloric acid；Pickling
After tail gas be passed through caustic wash tower, tail gas after alkali cleaning enters combustion furnace burning, and burning generates heat smoke and mixes air and be cooled to
Hydrochloric acid during the heating of entrance reboiler is desorption tower used after about 225 DEG C, finally empties；The by-product hydrochloric acid warp that chlorinated exhaust pickling obtains
Cross and after by-product hydrochloric acid filter tank filters, obtain the hydrochloric acid entrance by-product hydrochloric acid storage tank that concentration is about 28%, in by-product hydrochloric acid storage tank
Hydrochloric acid by transport pump to double-effect heat exchanger heat exchange after, temperature is increased to 65 DEG C by 25 DEG C, then enters de-analysis from desorption tower used top
Tower, hydrochloric acid interior evaporated hydrogen chloride gas by reboiler laser heating desorption tower used and is discharged by desorption tower used top, obtains after evaporation
Dilute hydrochloric acid concentration be 20%, temperature be 110 DEG C, desorption tower used bottom discharge；The dilute hydrochloric acid that desorption tower used bottom is discharged enters double
Effect heat exchanger reduces to 45 DEG C with temperature after the hydrochloric acid heat exchange of by-product hydrochloric acid storage tank, enters back into dilute hydrochloric acid the second cooler cold
But, enter dilute hydrochloric acid filter tank after being cooled to room temperature and filter, be then fed into dilute hydrochloric acid storage tank；Dilute hydrochloric acid in dilute hydrochloric acid storage tank by
Transport pump delivers to cooling medium again for-25 DEG C of freezings to dilute hydrochloric acid the 3rd cooler cooling that cooling medium is 5 DEG C of recirculated waters
Dilute hydrochloric acid the 4th cooler of saline cools down, and dilute hydrochloric acid temperature is down to 5 DEG C, then by being pumped to pickling tower as pickling absorbing liquid；
After the hydrogen chloride gas that desorption tower used top is discharged sends into hydrogen chloride cooler condensation, temperature reduces to 12 DEG C, and obtaining purity is 99.2%
High-purity hydrogen chloride gas, the dilute hydrochloric acid condensed out in hydrogen chloride cooler sends into dilute hydrochloric acid storage tank.
Embodiment 3:
The chlorinated exhaust produced in Titanium Dioxide Produced by Chloride Procedure production process is passed through pickling tower, obtains by-product hydrochloric acid；Pickling
After tail gas be passed through caustic wash tower, tail gas after alkali cleaning enters combustion furnace burning, and burning generates heat smoke and mixes air and be cooled to
Hydrochloric acid during the heating of entrance reboiler is desorption tower used after about 200 DEG C, finally empties；The by-product hydrochloric acid warp that chlorinated exhaust pickling obtains
Cross and after by-product hydrochloric acid filter tank filters, obtain the hydrochloric acid entrance by-product hydrochloric acid storage tank that concentration is about 30%, in by-product hydrochloric acid storage tank
Hydrochloric acid by transport pump to double-effect heat exchanger heat exchange after, temperature is increased to 60 DEG C by 20 DEG C, then enters de-analysis from desorption tower used top
Tower, hydrochloric acid interior evaporated hydrogen chloride gas by reboiler laser heating desorption tower used and is discharged by desorption tower used top, obtains after evaporation
Dilute hydrochloric acid concentration be 22%, temperature be 105 DEG C, desorption tower used bottom discharge；The dilute hydrochloric acid that desorption tower used bottom is discharged enters double
Effect heat exchanger reduces to 40 DEG C with temperature after the hydrochloric acid heat exchange of by-product hydrochloric acid storage tank, enters back into dilute hydrochloric acid the second cooler cold
But, enter dilute hydrochloric acid filter tank after being cooled to room temperature and filter, be then fed into dilute hydrochloric acid storage tank；Dilute hydrochloric acid in dilute hydrochloric acid storage tank by
Transport pump delivers to cooling medium again for-25 DEG C of freezings to dilute hydrochloric acid the 3rd cooler cooling that cooling medium is 5 DEG C of recirculated waters
Dilute hydrochloric acid the 4th cooler of saline cools down, and dilute hydrochloric acid temperature is down to 10 DEG C, then by being pumped to pickling tower as pickling absorbing liquid；
It is hydrogen chloride first cooler of 30 DEG C of recirculated waters, cooling that the hydrogen chloride gas that desorption tower used top is discharged successively sends into cooling medium
Medium be 5 DEG C of recirculated waters hydrogen chloride the second cooler condensation after temperature reduce to 10 DEG C, obtain high-purity chlorination that purity is 99.5%
Hydrogen, the dilute hydrochloric acid condensed out in hydrogen chloride cooler sends into dilute hydrochloric acid storage tank.
Claims (7)
1. the method for comprehensive utilization of chlorinated exhaust in Titanium Dioxide Produced by Chloride Procedure production process, it is characterised in that comprise the following steps:
(1) chlorinated exhaust produced in Titanium Dioxide Produced by Chloride Procedure production process is passed through pickling tower, obtains by-product hydrochloric acid；After pickling
Tail gas be passed through caustic wash tower, tail gas after alkali cleaning enters combustion furnace burning, and burning generates heat smoke and mixes air and be cooled to
Hydrochloric acid during the heating of entrance reboiler is desorption tower used after 200-250 DEG C, finally empties；
(2) by-product hydrochloric acid that chlorinated exhaust pickling obtains obtains concentration after by-product hydrochloric acid filter tank filters is 25-30%'s
Hydrochloric acid enters by-product hydrochloric acid storage tank, after the hydrochloric acid in by-product hydrochloric acid storage tank is by transport pump to double-effect heat exchanger heat exchange, from desorption tower used
Top enters desorption tower used, and hydrochloric acid interior evaporated hydrogen chloride gas by reboiler laser heating desorption tower used and arranged by desorption tower used top
Going out, the dilute hydrochloric acid obtained after evaporation is discharged by desorption tower used bottom；
(3) dilute hydrochloric acid that desorption tower used bottom is discharged enter double-effect heat exchanger with from after the hydrochloric acid heat exchange of by-product hydrochloric acid storage tank, then
Enter the cooling of dilute hydrochloric acid the second cooler, enter dilute hydrochloric acid filter tank after being cooled to room temperature and filter, be then fed into dilute hydrochloric acid storage tank；
(4) hydrogen chloride gas that desorption tower used top is discharged obtains purity after sending into hydrogen chloride cooler condensation is the height of 99-99.5%
Pure hydrogen chloride gas, the dilute hydrochloric acid condensed out in hydrogen chloride cooler sends into dilute hydrochloric acid storage tank.
The method of comprehensive utilization of chlorinated exhaust in a kind of Titanium Dioxide Produced by Chloride Procedure production process the most according to claim 1, its
Being characterised by, the hydrochloric acid temperature in by-product hydrochloric acid storage tank described in step (2) is 20-30 DEG C, temperature after double-effect heat exchanger heat exchange
Degree is for 60-70 DEG C.
The method of comprehensive utilization of chlorinated exhaust in a kind of Titanium Dioxide Produced by Chloride Procedure production process the most according to claim 1 and 2,
It is characterized in that, the dilute hydrochloric acid concentration described in step (2) is 19-22%.
The method of comprehensive utilization of chlorinated exhaust in a kind of Titanium Dioxide Produced by Chloride Procedure production process the most according to claim 1, its
Being characterised by, the hydrogen chloride cooler described in step (4) includes hydrogen chloride the first cooler and hydrogen chloride the second cooler, chlorination
The recirculated water that cooling medium is 30 DEG C of hydrogen the first cooler, the recirculated water that cooling medium is 5 DEG C of hydrogen chloride the second cooler,
10-15 DEG C is reduced to through hydrogen chloride the second cooler cooling afterchlorinate hydrogen temperature.
The method of comprehensive utilization of chlorinated exhaust in a kind of Titanium Dioxide Produced by Chloride Procedure production process the most according to claim 1, its
Being characterised by, the dilute hydrochloric acid temperature that in step (3), desorption tower used bottom is discharged is 105-115 DEG C, temperature after double-effect heat exchanger heat exchange
Degree reduces to 40-50 DEG C.
The method of comprehensive utilization of chlorinated exhaust in a kind of Titanium Dioxide Produced by Chloride Procedure production process,
It is characterized in that, in step (3), the dilute hydrochloric acid in dilute hydrochloric acid storage tank send after being cooled down by transport pump to dilute hydrochloric acid the 3rd cooler again
Cooling down to dilute hydrochloric acid the 4th cooler, dilute hydrochloric acid temperature is down to 5-10 DEG C, then by being pumped to pickling tower as pickling absorbing liquid；Institute
The recirculated water that dilute hydrochloric acid the 3rd cooler cooling medium is 5 DEG C stated, dilute hydrochloric acid the 4th cooler cooling medium is-25 DEG C cold
Freeze saline.
The method of comprehensive utilization of chlorinated exhaust in a kind of Titanium Dioxide Produced by Chloride Procedure production process the most according to claim 1, its
Being characterised by, the hydrogen chloride cooler condensed high-purity hydrogen chloride gas purity described in step (4) is 99%.
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Cited By (6)
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| CN106474876A (en) * | 2016-12-01 | 2017-03-08 | 攀枝花钢企欣宇化工有限公司 | The process reuse method of chlorinated exhaust in a kind of titanium sponge production |
| CN112374535A (en) * | 2020-12-07 | 2021-02-19 | 云南锡业锡化工材料有限责任公司 | Method for preparing stannous chloride by recycling dilute hydrochloric acid tail gas |
| CN113880135A (en) * | 2021-11-15 | 2022-01-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation of rutile TiO by waste gas of titanium white process by chlorination process2And method for dry ice |
| CN115041002A (en) * | 2022-05-09 | 2022-09-13 | 新疆晶硕新材料有限公司 | Method for treating tail gas in zircon sand chlorination production |
| CN115738468A (en) * | 2022-11-15 | 2023-03-07 | 四川轻化工大学 | Method and device for purifying by-product hydrochloric acid particles by titanium dioxide chlorination process |
| CN116036800A (en) * | 2023-01-09 | 2023-05-02 | 中国成达工程有限公司 | Method and system for treating and utilizing chlorinated tail gas |
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