CN111623601A - Ammonium metavanadate dehydration system and ammonium metavanadate ammonia-rich dehydration method - Google Patents
Ammonium metavanadate dehydration system and ammonium metavanadate ammonia-rich dehydration method Download PDFInfo
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- CN111623601A CN111623601A CN202010471298.XA CN202010471298A CN111623601A CN 111623601 A CN111623601 A CN 111623601A CN 202010471298 A CN202010471298 A CN 202010471298A CN 111623601 A CN111623601 A CN 111623601A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/02—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/006—Separating volatiles, e.g. recovering solvents from dryer exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/007—Dust filtering; Exhaust dust filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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Abstract
The invention provides an ammonium metavanadate dehydration system and an ammonium metavanadate ammonia-rich dehydration method, and belongs to the technical field of metallurgy. The dehydration system comprises an arched furnace body, a water tank and a condenser, and the dehydration method comprises the steps of making industrial ammonium metavanadate into cakes or granules; sealing and heating in a dehydration furnace in an ammonia-rich environment, and controlling the drying temperature to be 120-160 ℃; collecting ammonia and water vapor generated in the dehydration furnace, separating the ammonia and the water vapor in a condensation mode, and sending the separated ammonia back to the dehydration furnace again; and after the continuous dehydration meets the dehydration requirement, stopping heating the dehydration furnace, and stopping ammonia backflow until the temperature in the dehydration furnace is reduced to 50-80 ℃ to complete the dehydration. The invention has the advantages of reducing the difficulty of ammonia gas treatment, improving the dehydration efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to an ammonium metavanadate dehydration system and an ammonium-rich dehydration method of ammonium metavanadate.
Background
The water content of the industrial ammonium metavanadate filter cake is 30-40% (mass ratio), the filter cake needs to be dehydrated, the filter cake is ground into powder and then calcined to form vanadium pentoxide, ammonium metavanadate is a heat-sensitive substance and starts to decompose at about 135 ℃, ammonia gas is generated by decomposition in a vacuum environment, the industrial ammonium metavanadate filter cake is dehydrated in the prior art, in order to avoid the decomposition of ammonium metavanadate and generate ammonia gas (the ammonia gas needs to be collected and treated after being generated, ammonia pollution is avoided), the ammonia gas is dried in an environment at 80-100 ℃, the dehydration efficiency is low, and the ammonium metavanadate filter cake is required to be powdery and can meet the dehydration requirement.
Disclosure of Invention
The invention aims to provide an ammonium metavanadate ammonia-rich dehydration method aiming at the problems in the prior art, and the technical problem to be solved by the invention is how to improve the dehydration efficiency without an ammonia gas treatment process.
The purpose of the invention can be realized by the following technical scheme: the ammonium metavanadate ammonia-rich dehydration method is characterized by comprising the following steps:
A. making industrial ammonium metavanadate into cakes or granules;
B. sealing and heating in a dehydration furnace in an ammonia-rich environment, and controlling the drying temperature to be 120-160 ℃;
C. collecting ammonia and water vapor generated in the dehydration furnace, separating the ammonia and the water vapor in a condensation mode, and sending the separated ammonia back to the dehydration furnace again;
D. and after the continuous dehydration meets the dehydration requirement, stopping heating the dehydration furnace, and stopping ammonia backflow until the temperature in the dehydration furnace is reduced to 50-80 ℃ to complete the dehydration.
Under the ammonia-rich environment, ammonium metavanadate performs the following reaction:
NH4VO3·nH2O＝NH4VO3+nH2O
the constant-temperature dehydration time is about 4 hours, under the condition that the condenser continuously works, the ammonia gas is continuously supplied, the furnace body is naturally cooled for about 1 hour, and the higher temperature in the furnace body is kept so as to facilitate the work after the material is changed and improve the heat utilization.
The inhibition of ammonia decomposition refers to controlling the conditions of ammonia decomposition, and the decomposition reaction of ammonium metavanadate is inhibited under the ultra-low oxygen and ammonia-rich environment, and if the reaction is carried out under the oxygen-rich environment, the following reactions are carried out: 2NH4VO3+O2＝2NH4+V2O5The method can dissolve a small amount of generated ammonia gas into water for recycling, and can fill partial ammonia gas into the water tank under the initial condition to ensure that the ammonia gas with a certain concentration is dissolved in the water tank.
By the method, the dehydration time is greatly shortened, the amount of the industrial ammonium metavanadate subjected to single drying is greatly increased, the problem of ammonia emission is solved, dust does not need to be treated, and the workshop environment is optimized. The dehydration quality of the ammonium metavanadate can be ensured to the maximum extent.
The non-dehydration decomposition reaction of the ammonium metavanadate can be inhibited in an ammonia-rich environment, the production of low-valence vanadium oxide is reduced as much as possible, on one hand, the reprocessing procedure of ammonia gas can be omitted, and the dehydration quality and the dehydration efficiency can be ensured.
Further, the dewatering system adopted by the method has the following structure:
the furnace comprises an arched furnace body, a water tank matched with the inner wall of the furnace body is arranged in the furnace body, the upper end of the water tank is open, the water tank comprises a U-shaped inner plate and a U-shaped outer plate positioned outside the inner plate, a water storage cavity is formed between the inner plate and the outer plate, the inner plate seals the top of the furnace body, a heating cavity is arranged in the inner plate, a gas backflow cavity is formed between the inner plate and the inner wall of the furnace body, a first collecting cover and a second collecting cover are arranged at the top of the furnace body, a driving motor is arranged at the top of the outer wall of the furnace body, a first impeller positioned in the first collecting cover and a second impeller positioned in the second collecting cover are fixedly arranged on an output shaft of the driving motor, a plurality of insertion tubes are connected at an exhaust end of the first collecting cover, the insertion tubes are inserted in the water storage cavity, a backflow tube is connected at an, the water outlet end of the condenser conveys condensed water to the gas reflux cavity through a water pump; the gas reflux cavity is communicated with the water storage cavity, and the bottom of the furnace body is provided with an electric heater.
And the pipe wall of the lower half section of the insertion pipe is provided with a plurality of air outlet holes.
The bottom of planking is recessed to form one and arranges sediment portion, arrange sediment portion department and connect a water changing pipe, be provided with the valve on the water changing pipe.
The condenser comprises a condensation pipe, an outer protection pipe and an intermediate sleeve, the condensation pipe is located in the intermediate sleeve, the top of the intermediate sleeve is connected with the inner wall of the outer sheath, the upper end of the outer sheath is connected with a return pipe, the outer wall of the outer sheath is connected with a gas pipe, the bottom of the outer sheath is connected with the water pump, and the water outlet end of the water pump is connected with the gas return cavity.
The water vapor enters the middle sleeve from the upper end of the middle sleeve, namely the position of the condensing pipe, after being condensed, the water vapor is liquefied, the ammonia gas enters the gas conveying pipe from the position between the middle sleeve and the outer sheath and enters the bottom of the furnace body, and the water flow is conveyed to the gas reflux cavity, namely the upper part of the opening of the water tank by the water pump.
The air delivery pipe is provided with an air blower.
The return pipe is provided with an air pillow for alleviating the air pressure change in the furnace body. The air pillow is an air bag arranged in the steel tank body, and the air bag is provided with an inlet and an outlet and is used for connecting a return pipe.
The ammonia gets into the furnace body from the bottom, can increase the contact of ammonia and material on the one hand, can also accelerate cooling efficiency in the cooling stage.
Half section sets up the venthole under the intubate, can carry out the water bath to ammonia and steam, filters the particulate matter among the mist, when making the mist temperature reduction who gets into the condenser, improves its cleanliness factor, avoids the condenser scale deposit, and the cooling water backward flow gets into the water storage chamber at furnace body top, can carry out the precooling to the blender of backward flow.
The water tank that the furnace body inner wall set up, when the temperature was greater than the boiling point of water in the stove, water in the water tank was in the boiling state, reduced the water solubility rate of aquatic ammonia, and the backward flow volume of increase ammonia can also carry out constant temperature thermal-insulated to whole furnace body, slows down with the heat dissipation of going on outside the furnace body.
It can be seen that ammonia volatilization can be reduced by inhibiting the deamination decomposition of ammonium metavanadate in an ammonia-rich environment, and partial ammonia is refluxed, so that the ammonia content in the furnace is further increased, and the working procedure and the problem of ammonia emission treatment are avoided.
Partial ammonium metavanadate dust carried by the airflow can also flow back to the water tank, the existing dehydration process, including the dehydration of a dryer, has the problem of dust pollution, and the toxicity and the pollution of the ammonium metavanadate powder are higher in cost in the treatment process.
The constant-temperature dehydration is carried out at the temperature higher than the boiling point of water, the reflux efficiency of the ammonia gas is improved, then the temperature is reduced to be lower than the boiling point, the water-soluble proportion of the ammonia gas is increased under the condition of continuously keeping an ammonia-rich environment, conditions are provided for the start-up and the material change, and the release of the ammonia gas in the material change process is reduced.
Drawings
FIG. 1 is a schematic view of the present dewatering system.
Fig. 2 is a schematic structural view of a condenser.
Fig. 3 is an enlarged view of a portion a in fig. 1.
Fig. 4 is a schematic structural view of the cannula.
In the figure, 1, a furnace body; 11. a heating cavity; 12. a gas reflux cavity; 2. a water tank; 21. an inner plate; 22. an outer plate; 23. a water storage cavity; 31. a first collecting cover; 32. a second collecting cover; 33. a drive motor; 34. an impeller I; 35. an impeller II; 41. inserting a tube; 42. a return pipe; 43. a water pump; 44. an air outlet; 5. a condenser; 51. a condenser tube; 52. an outer protecting pipe; 53. a middle sleeve; 54. a gas delivery pipe; 55. a blower; 6. an electric heater; 7. changing a water pipe; 8. an air pillow.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
The dehydration method comprises the following steps:
making industrial ammonium metavanadate into cakes or granules;
sealing and heating in a dehydration furnace in an ammonia-rich environment, and controlling the drying temperature to be 120-160 ℃;
collecting ammonia gas and water vapor generated in the dehydration furnace, separating the ammonia gas in a condensation mode, and sending the separated ammonia gas back to the dehydration furnace again;
and after the continuous dehydration meets the dehydration requirement, stopping heating the dehydration furnace, and stopping ammonia backflow until the temperature in the dehydration furnace is reduced to 50-80 ℃ to complete the dehydration.
Under the ammonia-rich environment, ammonium metavanadate performs the following reaction:
NH4VO3·nH2O＝NH4VO3+nH2O
the constant-temperature dehydration time is about 4 hours, under the condition that the condenser 5 continuously works, the ammonia gas supply is continuous, the furnace body 1 is naturally cooled for about 1 hour, and the higher temperature in the furnace body 1 is kept, so that the furnace body can conveniently work after material changing, and the heat utilization is improved.
By the method, the dehydration time is greatly improved, the amount of the industrial ammonium metavanadate subjected to single drying is greatly increased, the problem of ammonia emission is avoided, and the dehydration quality of the ammonium metavanadate can be ensured to the greatest extent.
The non-dehydration decomposition reaction of the ammonium metavanadate can be inhibited in an ammonia-rich environment, the production of low-valence vanadium oxide is reduced as much as possible, on one hand, the reprocessing procedure of ammonia gas can be omitted, and the dehydration quality and the dehydration efficiency can be ensured.
Further, the dewatering system adopted by the method has the following structure:
as shown in fig. 1, fig. 2, fig. 3 and fig. 4, the furnace comprises an arched furnace body 1, a water tank 2 matched with the inner wall of the furnace body 1 is arranged in the furnace body 1, the upper end of the water tank 2 is open, the water tank 2 comprises a U-shaped inner plate 21 and a U-shaped outer plate 22 positioned outside the inner plate 21, a water storage cavity 23 is formed between the inner plate 21 and the outer plate 22, the inner plate 21 seals the top of the furnace body 1, a heating cavity 11 is arranged in the inner plate 21, a gas reflux cavity 12 is formed between the inner plate 21 and the inner wall of the furnace body 1, a first collection cover 31 and a second collection cover 32 are arranged on the top of the furnace body 1, a driving motor 33 is arranged on the top of the outer wall of the furnace body 1, a first impeller 34 positioned in the first collection cover 31 and a second impeller 35 positioned in the second collection cover 32 are fixedly arranged on the output shaft of the driving motor 33, a plurality of insertion tubes 41 are connected, the return pipe 42 is connected with a condenser 5, the air outlet end of the condenser 5 is connected with the bottom of the heating cavity 11, and the water outlet end of the condenser 5 conveys condensed water to the gas return cavity 12 through a water pump 43; the gas return cavity 12 is communicated with the water storage cavity 23, and the bottom of the furnace body 1 is provided with an electric heater 6.
The tube wall of the lower half section of the cannula 41 is provided with a plurality of air outlets 44.
The bottom of the outer plate 22 is recessed to form a slag discharge part, the slag discharge part is connected with a water changing pipe 7, and the water changing pipe 7 is provided with a valve.
The condenser 5 comprises a condensation pipe 51, an outer protection pipe 52 and a middle sleeve 53, wherein the condensation pipe 51 is positioned in the middle sleeve 53, the top of the middle sleeve 53 is connected with the inner wall of the outer sheath, the upper end of the outer sheath is connected with a return pipe 42, the outer wall of the outer sheath is connected with a gas conveying pipe 54, the bottom of the outer sheath is connected with a water pump 43, and the water outlet end of the water pump 43 is connected with the gas return cavity 12.
The air pipe 54 is provided with a blower 55.
The return pipe 42 is provided with an air pillow 8 for alleviating the change of the air pressure in the furnace body 1. The air pillow 8 is an air bag provided in the steel tank, and the air bag has an inlet and an outlet for connecting with the return pipe 42.
The ammonia gets into furnace body 1 from the bottom, can increase the contact of ammonia and material on the one hand, can also accelerate cooling efficiency in the cooling stage.
The half section sets up venthole 44 under 41, can carry out the water bath to ammonia and steam, filters the particulate matter among the mist, when making the mist temperature reduction that gets into condenser 5, improves its cleanliness factor, avoids condenser 5 scale deposit, and the cooling water backward flow gets into the water storage chamber 23 at furnace body 1 top, can carry out the precooling to the blender of backward flow.
The water tank 2 that the inner wall of furnace body 1 set up, when the temperature was greater than the boiling point of water in the stove, the water in the water tank 2 was in the boiling state, reduced the water solubility rate of aquatic ammonia, and the backward flow volume of increase ammonia can also carry out constant temperature to whole furnace body 1 and insulate against heat, slows down with the heat dissipation of going on outside furnace body 1.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides an ammonium metavanadate dewatering system, a serial communication port, including arched furnace body (1), have in furnace body (1) water tank (2) with furnace body (1) inner wall adaptation, water tank (2) upper end opening, water tank (2) include inner panel (21) of U type and planking (22) that are located the U type in inner panel (21) outside, form a water storage chamber (23) between inner panel (21) and planking (22), inner panel (21) seal furnace body (1) top, be heating chamber (11) within inner panel (21), form a gas backward flow chamber (12) between inner panel (21) and furnace body (1) inner wall, furnace body (1) top is provided with collects cover one (31) and collects cover two (32), the top of furnace body (1) outer wall sets up a driving motor (33), fixed being provided with on the output shaft of driving motor (33) is located collect cover one (34) in impeller one (31) and being located and collect cover two (32) 32) The exhaust end of the first collecting cover (31) is connected with a plurality of insertion pipes (41), the insertion pipes (41) are inserted into the water storage cavity (23), the exhaust end of the second collecting cover (32) is connected with a return pipe (42), the return pipe (42) is connected with a condenser (5), the air outlet end of the condenser (5) is connected with the bottom of the heating cavity (11), and the water outlet end of the condenser (5) conveys condensed water to the air return cavity (12) through a water pump (43); the gas reflux cavity (12) is communicated with the water storage cavity (23), and the bottom of the furnace body (1) is provided with an electric heater (6).
2. The ammonium metavanadate dehydration system according to claim 1, wherein a plurality of air outlet holes (44) are formed on the tube wall of the lower half section of the insertion tube (41).
3. The ammonium metavanadate dewatering system according to claim 1 or 2, wherein the bottom of the outer plate (22) is recessed to form a slag discharge portion, the slag discharge portion is connected with a water change pipe (7), and a valve is arranged on the water change pipe (7).
4. An ammonium metavanadate dehydration system according to claim 1 or 2, wherein the condenser (5) comprises a condensation pipe (51), an outer protection pipe (52) and an intermediate sleeve (53), the condensation pipe (51) is positioned in the intermediate sleeve (53), the top of the intermediate sleeve (53) is connected with the inner wall of the outer sheath, the upper end of the outer sheath is connected with the return pipe (42), the outer wall of the outer sheath is connected with a gas conveying pipe (54), the bottom of the outer sheath is connected with the water pump (43), and the water outlet end of the water pump (43) is connected with the gas return cavity (12).
5. The ammonium metavanadate dehydration system according to claim 4, wherein a blower (55) is arranged on the air conveying pipe (54).
6. An ammonium metavanadate dehydration system according to claim 4, wherein said return pipe (42) is provided with an air lock (8) for moderating the change of air pressure in the furnace body (1).
7. A method for dehydrating ammonia according to the ammonium metavanadate dehydration system in any one of claims 1-6, wherein the method comprises the following steps:
A. making industrial ammonium metavanadate into cakes or granules;
B. sealing and heating in a dehydration furnace in an ammonia-rich environment, and controlling the drying temperature to be 120-160 ℃;
C. collecting ammonia and water vapor generated in the dehydration furnace, separating the ammonia and the water vapor in a condensation mode, and sending the separated ammonia back to the dehydration furnace again;
D. and after the continuous dehydration meets the dehydration requirement, stopping heating the dehydration furnace, and stopping ammonia backflow until the temperature in the dehydration furnace is reduced to 50-80 ℃ to complete the dehydration.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229155A (en) * | 2020-09-28 | 2021-01-15 | 南昌航天文化科技有限公司 | Nano clean propylene painting pigment production equipment |
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