CN216676993U - Vacuum low-temperature circulating concentration system for fluosilicic acid - Google Patents
Vacuum low-temperature circulating concentration system for fluosilicic acid Download PDFInfo
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- CN216676993U CN216676993U CN202220131326.8U CN202220131326U CN216676993U CN 216676993 U CN216676993 U CN 216676993U CN 202220131326 U CN202220131326 U CN 202220131326U CN 216676993 U CN216676993 U CN 216676993U
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Abstract
The utility model discloses a fluosilicic acid vacuum low-temperature circulating concentration system, which comprises a flash chamber, a fluosilicic acid heater, a fluosilicic acid circulating pump and an atmospheric condenser, wherein the fluosilicic acid heater and the fluosilicic acid circulating pump are connected with a liquid collecting region in the flash chamber to form a fluosilicic acid circulating unit, the fluosilicic acid circulating unit is used for heating an introduced dilute fluosilicic acid solution to be constant in a temperature region, and the atmospheric condenser is communicated with a gas collecting region in the flash chamber; the fluosilicic acid circulating unit is communicated with a liquid supplementing pipe for supplementing a dilute fluosilicic acid solution, and a liquid collecting area in the flash chamber is communicated with a liquid discharging pipe for discharging a concentrated fluosilicic acid solution; compared with the prior art, the utility model has the advantages of relatively simpler concentration equipment for fluorosilicic acid solution and high concentration yield of fluorosilicic acid solution.
Description
Technical Field
The utility model relates to the technical field of fluosilicic acid concentration, in particular to a fluosilicic acid vacuum low-temperature circulating concentration system.
Background
In the process of producing phosphoric acid by using phosphate ore, the phosphate ore generally contains 3.0-4.0% of fluorine, fluorine-containing waste gas is generated in the process of decomposing the phosphate ore by concentrated acid, the fluorine-containing waste gas is washed and absorbed by multi-stage water to generate 10-20% mass concentration fluosilicic acid, the commercial added value is low due to the overhigh water content, and the high-concentration fluosilicic acid is widely applied to various fields such as fluorine chemical industry, metallurgy electrolytic plating and the like and has good economical efficiency, so that the low-concentration fluosilicic acid is required to be concentrated to improve the economic value of the low-concentration fluosilicic acid.
Fluosilicic acid is easily decomposed into silicon tetrafluoride and hydrogen fluoride gas by heat, and therefore, only exists in the form of a solution. The most stable fluosilicic acid has a concentration of 13%, the thermal stability of the most stable fluosilicic acid is rapidly deteriorated with the increase of the concentration of the fluosilicic acid, and an azeotrope-like body is formed when the concentration reaches 36.4% and the temperature is 107.3 ℃.
Because of the characteristic of poor thermal stability of fluosilicic acid, the existing fluosilicic acid concentration technology is mainly low-temperature concentration, dilute fluosilicic acid solution is heated to 50-80 ℃, liquid water is flashed into water vapor under the vacuum condition, and the concentration is realized. Under the condition, silicon tetrafluoride gas generated by decomposition and water vapor in flash evaporation gas can react rapidly in a gas phase pipeline to generate silica gel, so that the pipeline and equipment are blocked, the pipeline needs to be cleaned frequently, the operation rate of the device is low, and the yield of fluosilicic acid is also low.
Patent application No. CN201910559094.9 discloses a method and a device for concentrating fluosilicic acid, which adopts 40-80 ℃ hot air to exchange with 20-40 ℃ fluosilicic acid solution to remove water in the silicon acid solution and improve the fluosilicic acid to the required concentration. Under the condition, the hot air easily decomposes the fluosilicic acid in the fluosilicic acid solution, so that the yield of the concentrated fluosilicic acid solution is low, the fluosilicic acid is easy to block a pipeline after decomposition, and simultaneously, a large amount of fluorine-containing waste gas is generated, so that a subsequent waste gas treatment system is relatively complex.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a fluosilicic acid vacuum low-temperature circulating concentration system to solve the problems that in the prior art, a pipeline is easy to block in the process of concentrating a fluosilicic acid solution, or a large amount of fluorine-containing waste gas is generated to cause a follow-up waste gas treatment system to be relatively complex and the yield is low.
In order to achieve the purpose, the utility model adopts the following technical scheme: a fluosilicic acid vacuum low-temperature circulating concentration system comprises a flash chamber, a fluosilicic acid heater, a fluosilicic acid circulating pump and an atmospheric condenser, wherein the fluosilicic acid heater and the fluosilicic acid circulating pump are connected with a liquid collection area in the flash chamber to form a fluosilicic acid circulating unit, the fluosilicic acid circulating unit is used for heating an introduced dilute fluosilicic acid solution to be constant in a temperature area, and the atmospheric condenser is communicated with a gas collection area in the flash chamber;
the fluosilicic acid circulating unit is communicated with a liquid supplementing pipe for supplementing a dilute fluosilicic acid solution, and a liquid collecting area in the flash chamber is communicated with a liquid discharging pipe for discharging a concentrated fluosilicic acid solution.
Further, the atmospheric condenser and the flash chamber are arranged in the same tank body.
Furthermore, the tank body is divided into a working area of the atmospheric condenser and a working area of the flash chamber by a vertically arranged flow baffle, the working area of the flash chamber is divided into a gas collecting area and a liquid collecting area which are distributed up and down by a horizontally arranged wire mesh demister, and the gas collecting area is communicated with the working area of the atmospheric condenser through gas guide holes arranged on the flow baffle.
Furthermore, a plurality of liquid distributors are uniformly distributed in the working area of the atmospheric condenser.
Furthermore, the number of the liquid distributors is three, and the liquid distributors are distributed at the top of the working area of the atmospheric condenser and at two sides below the top of the working area.
Further, every liquid distributor all includes and is responsible for a plurality of branch pipes that axial direction distributes, a plurality of branch pipes all with be responsible for intercommunication and staggered arrangement, all have a plurality of nozzles along its axial direction intercommunication on every branch pipe, be responsible for and wear to establish the internal, outer insert tube intercommunication of jar.
Furthermore, an anti-impact grid plate is arranged at a liquid inlet of the dilute fluorosilicic acid solution which is communicated with the fluorosilicic acid circulating unit in the liquid collecting area of the flash chamber.
Compared with the prior art, the utility model has the following beneficial effects:
the fluosilicic acid vacuum low-temperature circulating concentration system mainly comprises a flash chamber, a fluosilicic acid heater, a fluosilicic acid circulating pump and an atmospheric condenser, and is simple in structure, the dilute fluosilicic acid solution fed into a liquid supplementing pipe is circulated and heated through the flash chamber, the fluosilicic acid heater and the fluosilicic acid circulating pump, the dilute fluosilicic acid solution is kept in a temperature area, fluosilicic acid is basically not decomposed in the temperature area, meanwhile, moisture in the dilute fluosilicic acid solution is flashed in the flash chamber to form water vapor, the water vapor enters a gas collection area to be separated from the fluosilicic acid, and the fluosilicic acid is concentrated and then is discharged from a liquid discharge pipe to obtain high-yield high-concentration fluosilicic acid solution; the separated vapor enters an atmospheric condenser to be condensed to form condensate, so that pipelines and equipment cannot be blocked, a large amount of fluorine-containing waste gas cannot be generated in the process, and a complex waste gas treatment system is reduced.
Drawings
FIG. 1 is a process flow diagram of one embodiment of the present invention;
FIG. 2 is a schematic structural view of the can body of FIG. 1;
fig. 3 is a schematic distribution diagram of the liquid distributor of fig. 2.
Reference numerals in the drawings of the specification include: the device comprises a flash evaporation chamber 1, a fluosilicic acid heater 2, a fluosilicic acid circulating pump 3, an atmospheric condenser 4, a liquid supplementing pipe 5, a liquid discharging pipe 6, a tank body 7, a flow baffle plate 8, a gas collecting area 9, a liquid collecting area 10, a wire mesh demister 11, a liquid distributor 12, a main pipe 121, branch pipes 122, a nozzle 123 and an anti-impact grid plate 13.
Detailed Description
The utility model is explained in more detail below by means of specific embodiments:
as shown in fig. 1, an embodiment of the present invention provides a fluosilicic acid vacuum low-temperature circulation concentration system, which includes a flash chamber 1, a fluosilicic acid heater 2, a fluosilicic acid circulation pump 3, and an atmospheric condenser 4, wherein the fluosilicic acid heater 2, the fluosilicic acid circulation pump 3 and a liquid collection region 10 in the flash chamber 1 are connected to form a fluosilicic acid circulation unit, the fluosilicic acid circulation unit is used for heating an introduced dilute fluosilicic acid solution to a constant temperature region, and the atmospheric condenser 4 is communicated with a gas collection region 9 in the flash chamber 1;
the fluosilicic acid circulating unit is communicated with a liquid supplementing pipe 5 for supplementing a dilute fluosilicic acid solution, and a liquid collecting area 10 in the flash chamber 1 is communicated with a liquid discharging pipe 6 for discharging a concentrated fluosilicic acid solution.
The vacuum low-temperature circulating concentration system for fluosilicic acid mainly comprises a flash chamber 1, a fluosilicic acid heater 2, a fluosilicic acid circulating pump 3 and an atmospheric condenser 4, and is simple in structure, dilute fluosilicic acid solution fed into a fluid infusion pipe 5 is circulated and heated through the flash chamber 1, the fluosilicic acid heater 2 and the fluosilicic acid circulating pump 3, the dilute fluosilicic acid solution is constant in a temperature region, fluosilicic acid is basically not decomposed in the temperature region, meanwhile, moisture in the dilute fluosilicic acid solution is flashed in the flash chamber 1 to form water vapor, the water vapor enters a gas collection region 9 to be separated from the fluosilicic acid, and the fluosilicic acid is discharged from a liquid discharge pipe 6 after being concentrated to obtain high-yield high-concentration fluosilicic acid solution; the separated vapor enters an atmospheric condenser 4 to be condensed to form condensate, so that pipelines and equipment cannot be blocked, a large amount of fluorine-containing waste gas cannot be generated in the process, and a complex waste gas treatment system is reduced; in the process, the fluosilicic acid circulating pump 3 provides power for the flow of the dilute fluosilicic acid solution in the fluosilicic acid circulating unit, the fluosilicic acid heater 2 can be a heat exchanger, and the fluosilicic acid heater 2 heats the dilute fluosilicic acid solution flowing in the fluosilicic acid circulating unit through a heat source; can detect the rare fluorosilicic acid solution temperature of circulation through the thermometer that sets up in flash chamber 1 to make the rare fluorosilicic acid solution temperature of circulation invariable be being not more than 45 ℃ within a definite time, consequently moisture in the rare fluorosilicic acid solution can flash distillation formation vapor in the temperature interval, and fluosilicic acid does not decompose.
In order to ensure that the temperature of the circulated diluted fluorosilicic acid solution is constant within a range of not more than 45 ℃, the circulation amount of the diluted fluorosilicic acid solution and the flow rate of a heat source in the fluorosilicic acid heater 2 can be adjusted.
According to another embodiment of the utility model, as shown in fig. 2, the atmospheric condenser 4 and the flash chamber 1 are arranged in the same tank 7, so that the atmospheric condenser 4 and the flash chamber 1 can be reasonably arranged, and the purpose of reducing equipment cost is achieved.
In this embodiment, specifically, the tank 7 is partitioned into a working area of the atmospheric condenser 4 and a working area of the flash chamber 1 by a vertically arranged baffle plate 8, the working area of the flash chamber 1 is partitioned into a gas collecting area 9 and a liquid collecting area 10 which are distributed up and down by a horizontally arranged wire mesh demister 11, and the gas collecting area 9 is communicated with the working area of the atmospheric condenser 4 through gas guide holes opened in the baffle plate 8.
The space in the tank body 7 is reasonably divided into a gas collection area 9 of the flash chamber 1, a liquid collection area 10 of the flash chamber 1 and a working area of the atmospheric condenser 4 through a flow baffle 8 and a wire mesh demister 11, so that separated water vapor and diluted fluosilicic acid solution can be collected conveniently, and space is provided for condensation of the water vapor; dilute fluorosilicic acid solution is in collecting space 10, and in the vapor after the flash distillation entered gas collecting space 9 after passing wire mesh demister 11, wire mesh demister 11 can get rid of the dilute fluorosilicic acid solution (foam form) that smugglies secretly in the vapor, and back vapor gets into the working area of atmosphere condenser 4 and condenses and forms the condensate after passing the air guide hole, and concentrated fluorosilicic acid solution discharges from fluid-discharge tube 6 in collecting space 10.
In order to improve the installation stability of the wire mesh demister 11, a bracket fixedly connected with the inner wall of the tank 7 is supported at the bottom thereof.
According to another embodiment of the utility model, as shown in fig. 2 and fig. 3, the fluosilicic acid vacuum low-temperature circulation concentration system is provided, wherein a plurality of liquid distributors 12 are distributed in the working area of the atmospheric condenser 4.
The low-temperature cooling liquid is uniformly sprayed in the working area of the atmospheric condenser 4 through the liquid distributors 12, heat exchange is carried out between the low-temperature cooling liquid and the water vapor entering the working area of the atmospheric condenser 4, the water vapor is condensed to form condensate, and the condensate is discharged from a condensate discharge pipe at the bottom of the working area of the atmospheric condenser 4.
In this embodiment, three liquid distributors 12 are provided and distributed at the top of the working area of the atmospheric condenser 4 and at two sides below the top of the working area, so as to facilitate uniform distribution of the low-temperature cooling liquid in the working area of the atmospheric condenser 4; the number and distribution of the liquid distributors 12 can be adjusted according to the actual situation.
Each of the liquid distributors 12 includes a main pipe 121 and a plurality of branch pipes 122 distributed in the axial direction of the main pipe 121, the plurality of branch pipes 122 are communicated with the main pipe 121 and are arranged in a staggered manner, each branch pipe 122 is communicated with a plurality of nozzles 123 along the axial direction thereof, and the main pipe 121 is communicated with an insertion pipe penetrating through the inside and outside of the tank 7.
In this embodiment, the main pipe 121 and the branch pipes connected thereto are vertically arranged.
The low-temperature coolant is introduced into the main pipe 121 through the insertion pipe, then enters the plurality of branch pipes 122, and is sprayed into the working area of the atmospheric condenser 4 through the spray nozzles 123.
According to another embodiment of the utility model, as shown in fig. 2, in the fluosilicic acid vacuum low-temperature circulation concentration system, an anti-collision grid plate 13 is arranged at an inlet of a dilute fluosilicic acid solution which is used for communicating with a fluosilicic acid circulation unit in a liquid collection area 10 of a flash chamber 1, namely, the anti-collision grid plate 13 is arranged at the inlet of the liquid collection area 10 of the flash chamber 1.
Impact force of the circulated diluted fluorosilicic acid solution entering the flash chamber 1 is reduced through the anti-impact grid plate 13, foam generation in the diluted fluorosilicic acid solution is reduced, and separation of water vapor and the fluorosilicic acid solution is facilitated.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A fluosilicic acid vacuum low-temperature circulating concentration system is characterized by comprising a flash chamber, a fluosilicic acid heater, a fluosilicic acid circulating pump and an atmospheric condenser, wherein the fluosilicic acid heater and the fluosilicic acid circulating pump are connected with a liquid collecting region in the flash chamber to form a fluosilicic acid circulating unit which is used for heating an introduced dilute fluosilicic acid solution to be constant in a temperature region, and the atmospheric condenser is communicated with a gas collecting region in the flash chamber;
the fluosilicic acid circulating unit is communicated with a liquid supplementing pipe for supplementing a dilute fluosilicic acid solution, and a liquid collecting area in the flash chamber is communicated with a liquid discharging pipe for discharging a concentrated fluosilicic acid solution.
2. The vacuum low-temperature circulating concentration system for fluosilicic acid as claimed in claim 1, wherein: the atmospheric condenser and the flash chamber are arranged in the same tank body.
3. The vacuum low-temperature circulating concentration system for fluosilicic acid as claimed in claim 2, wherein: the tank body is divided into a working area of the atmospheric condenser and a working area of the flash chamber through a flow baffle plate which is vertically arranged, the working area of the flash chamber is divided into a gas collecting area and a liquid collecting area which are distributed up and down through a wire mesh demister which is horizontally arranged, and the gas collecting area is communicated with the working area of the atmospheric condenser through gas guide holes which are formed in the flow baffle plate.
4. The vacuum low-temperature circulating concentration system for fluosilicic acid as claimed in claim 3, wherein: and a plurality of liquid distributors are uniformly distributed in the working area of the atmospheric condenser.
5. The vacuum low-temperature circulating concentration system for fluosilicic acid as claimed in claim 4, wherein: the number of the liquid distributors is three, and the liquid distributors are distributed at the top of the working area of the atmospheric condenser and at two sides below the top of the working area.
6. A vacuum cryogenic cycle concentration system of fluosilicic acid as claimed in claim 4 or 5, wherein: every liquid distributor all includes and is responsible for and be responsible for a plurality of branch pipes that axial direction distributes, and a plurality of branch pipes all with be responsible for the intercommunication and staggered arrangement, all have a plurality of nozzles along its axial direction intercommunication on every branch pipe, be responsible for and wear to establish the inside and outside insert tube intercommunication of jar.
7. The vacuum low-temperature circulating concentration system for fluosilicic acid as claimed in claim 3, wherein: and an anti-impact grid plate is arranged at a liquid inlet of the dilute fluorosilicic acid solution which is communicated with the fluosilicic acid circulating unit in the liquid collecting area of the flash chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220131326.8U CN216676993U (en) | 2022-01-18 | 2022-01-18 | Vacuum low-temperature circulating concentration system for fluosilicic acid |
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| CN202220131326.8U CN216676993U (en) | 2022-01-18 | 2022-01-18 | Vacuum low-temperature circulating concentration system for fluosilicic acid |
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| CN216676993U true CN216676993U (en) | 2022-06-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114225443A (en) * | 2022-01-18 | 2022-03-25 | 何浩明 | Vacuum low-temperature circulating concentration system and method for fluosilicic acid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114225443A (en) * | 2022-01-18 | 2022-03-25 | 何浩明 | Vacuum low-temperature circulating concentration system and method for fluosilicic acid |
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Inventor after: He Haoming Inventor after: Gong Xingrong Inventor after: Wang Fei Inventor before: He Minghao Inventor before: Gong Xingrong Inventor before: Wang Fei |