CN212269466U - Vacuum filtration defluorination device for hot phosphoric acid production - Google Patents
Vacuum filtration defluorination device for hot phosphoric acid production Download PDFInfo
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- CN212269466U CN212269466U CN202021758056.0U CN202021758056U CN212269466U CN 212269466 U CN212269466 U CN 212269466U CN 202021758056 U CN202021758056 U CN 202021758056U CN 212269466 U CN212269466 U CN 212269466U
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- phosphoric acid
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Abstract
The utility model provides a device of defluorination in phosphoric acid production in heat vacuum filtration, including filter, drip washing tower and shower nozzle, the vacuum pump is connected on drip washing tower upper portion, and drip washing tower middle part is filled and is packed filler, leaves drip washing tower cavity below the filler, and the fluosilicic acid pipe is connected to drip washing tower bottom, and the filter cloth is connected on filter upper portion, connects the screen cloth under the filter cloth, packs filler under the screen cloth, and the phosphoric acid pipe is connected to the filter bottom, and filter cavity and drip washing tower cavity pass through the suction filtration pipe intercommunication. And (3) filtering the mixed solution of the high-temperature phosphoric acid and the phosphogypsum in vacuum while the mixed solution is hot in a filter, allowing the hot filtrate to flow along the surface of the filler in a vacuum chamber, pumping vacuum filtered steam into a leaching tower, and leaching with water to obtain the fluosilicic acid. The utility model can reduce the fluorine content in the by-product, reduce the fluorine content of the product, filter the by-product while hot, reduce the combination degree of fluorine and phosphoric acid products and by-products, and reduce the treatment difficulty; the resistance to the escape of fluorine can be reduced by vacuum filtration; the escaped fluorine is recycled, and new economic value is generated.
Description
Technical Field
The utility model belongs to the technical field of sulfuric acid decomposition phosphorite system wet process phosphoric acid's technology, especially, relate to a device of defluorination in phosphoric acid production in vacuum filtration while hot.
Background
The fluorine resource existing in nature mainly comprises fluorite and phosphate ore, and is a raw material for manufacturing various fluorides. The worldwide fluorite resource is mainly distributed in China, Mongolia, Mexico, south Africa and Canada, etc. The method is mainly concentrated in provinces such as inner Mongolia, Zhejiang, Fujian, Henan and Jiangxi, and the like, the number of fluorite ore deposits (points) in the provinces accounts for 70% of the total fluorite deposits (points) in the whole country, and the reserves accounts for 90% of the total fluorite deposits (points) in the whole country. The abundant fluorite reserves bring stable raw material sources for the production of inorganic fluorine chemical industry and lay a solid foundation for the development of the inorganic fluorine chemical industry in China. At present, the exploitable reserve of fluorite resources in China is about 5000 ten thousand tons, and according to the domestic predicted fluorite demand and the average annual fluorite export (80-100 ten thousand tons), the usable fluorite reserve can be calculated and only can be exploited for about 15 years. Fluorite is a non-renewable resource, and the rapid development of the industry in China inevitably leads to increasingly prominent shortage of fluorite resources and gradually becomes the bottleneck of the development of fluorine chemical industry.
Phosphate rock is one of the more abundant mineral resources in China, and the reserve occupies the second place in the world. The quantity of the phosphorus ore mined in China each year reaches more than 5000 million tons, and the phosphorus ore is increased at a speed of 5 percent. The content of fluorine in the phosphorus ore is about 3 percent, fluorine resources are recovered from phosphorus chemical industry, and then organic and inorganic fluorine chemical industry high-end materials are developed, so that the method is a current road which can improve the comprehensive utilization rate of resources, prolong the industrial chain of phosphorus chemical industry and promote the clean production of phosphorus chemical industry and the sustainable development of high-end fluorine material industry.
In the process of producing phosphate fertilizer by reacting phosphate pulp with sulfuric acid, the escaped fluorine-containing waste gas is absorbed to obtain fluosilicic acid, and then the fluosilicic acid is further processed into sodium fluosilicate. The utilization rate of fluorine in the existing process is only 10%, and about 90% of fluorine resources enter phosphoric acid and phosphogypsum.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device of defluorination is filtered in phosphoric acid production vacuum while hot, further draws the fluorine that enters into in phosphoric acid and the ardealite, improves the utilization ratio of fluorine in the phosphorite.
The device for vacuum filtration defluorination in phosphoric acid production while hot comprises a filter, an elution tower and a spray head, wherein a vacuum pump connecting port is formed in the upper part of the elution tower, filler is filled below the spray head and the vacuum pump connecting port, a cavity of the elution tower is reserved below the filler, a fluosilicic acid conduit is connected to the bottom of the elution tower and is inserted into a fluosilicic acid tank, filter cloth is connected to the upper part of the filter, a screen is connected to the lower part of the filter cloth, filler is filled below the screen, a cavity of the filter is reserved below the filler, a phosphoric acid conduit is connected to the bottom of the filter and is inserted into the phosphoric acid tank, and the cavity of the filter and the.
According to the device for vacuum filtration defluorination in phosphoric acid production while hot, the phosphoric acid liquid level of the cavity of the filter cannot exceed the lowest position of the pipe orifice of the suction filter pipe, and the fluosilicic acid liquid level of the cavity of the leaching tower cannot exceed the lowest position of the pipe orifice of the suction filter pipe.
In the device for vacuum filtration and defluorination in phosphoric acid production, the screen is close to the filter cloth.
In the hot vacuum filtration defluorination device for phosphoric acid production, the filler filled below the screen mesh is phosphoric acid filler.
According to the device for vacuum filtration and defluorination in the phosphoric acid production while the phosphoric acid is hot, the filter cloth can intercept phosphogypsum and allow phosphoric acid to pass through.
According to the device for vacuum filtration defluorination in phosphoric acid production while the phosphoric acid is hot, the phosphoric acid liquid level in the phosphoric acid tank is required to be higher than the lowest position of the phosphoric acid guide pipe, and the fluosilicic acid liquid level in the fluosilicic acid tank is higher than the lowest position of the fluosilicic acid guide pipe.
In the hot vacuum filtration defluorination device in the phosphoric acid production, the phosphoric acid packing is Raschig rings.
The vacuum filtration defluorination device for producing phosphoric acid while the phosphoric acid is hot also comprises a heat preservation device.
The utility model has the advantages that: the utility model filters the hot mixed solution of high-temperature phosphoric acid and phosphogypsum in vacuum, and the hot filtrate flows on the surface of the filler, thereby reducing the fluorine content in the by-product and reducing the pollution to the environment; meanwhile, the fluorine content of products such as phosphoric acid and phosphoric acid is reduced, and the quality is improved; the heat preservation device can preserve heat, ensure hot filtration, reduce the combination degree of fluorine, phosphoric acid products and byproducts, reduce the treatment difficulty and improve the treatment efficiency; the vacuum pump can provide vacuum, reduce the resistance of escaping fluorine and improve the efficiency; the phosphoric acid conduit and the fluosilicic acid conduit not only have the function of guiding products, but also have the function of liquid seal, thereby preventing the escape of fluorine vapor. The utility model can further extract the fluorine entering into the phosphoric acid and the phosphogypsum, and improve the utilization rate of the fluorine by 3-5 percent.
Drawings
Fig. 1 is a schematic structural diagram of a hot vacuum filtration defluorination apparatus in phosphoric acid production.
In the figure, 1-mixed liquid, 2-phosphogypsum, 3-filter cloth, 4-screen, 5-phosphoric acid filler, 6-filter, 7-phosphoric acid tank, 8-phosphoric acid conduit, 9-suction filter pipe, 10-fluorosilicic acid tank, 11-filler, 12-spray head, 13-leaching tower and 14-fluorosilicic acid conduit.
Detailed Description
Example 1
The device for vacuum filtration defluorination in phosphoric acid production while hot comprises a filter 6, an elution tower 13 and a spray head 12, wherein the upper part of the elution tower 13 is provided with a vacuum pump connecting port for connecting a vacuum pump. The filling material 11 is filled below a connecting port of the spray head 12 and the vacuum pump, a cavity of the leaching tower is reserved below the filling material 11, the fluosilicic acid guide pipe 14 is connected to the bottom of the leaching tower 13, the fluosilicic acid guide pipe 14 is inserted into the fluosilicic acid groove 10, the filter cloth 3 is connected to the upper middle portion of the filter 6, the screen 4 is connected below the filter cloth 3, the phosphoric acid filling material 5 is filled below the screen 4, a filter cavity is reserved below the phosphoric acid filling material 5, the phosphoric acid guide pipe 8 is connected to the bottom of the filter 6, the phosphoric acid guide pipe 8 is inserted into the phosphoric acid groove 7, and the filter cavity is.
Example 2
Based on the embodiment 1 and the embodiment 2, which exemplify several further defined technical features, the embodiment 1 can be combined alternatively or in a plurality of combinations to form a plurality of new and different technical solutions.
Further, according to the hot vacuum filtration defluorination device in the phosphoric acid production, the phosphoric acid liquid level of the filter cavity cannot exceed the lowest position of the pipe orifice of the suction filter pipe 9, and the fluosilicic acid liquid level of the leaching tower cavity cannot exceed the lowest position of the pipe orifice of the suction filter pipe 9.
Further, in the device for filtering and defluorinating in vacuum when the device is hot in the phosphoric acid production, the filter cloth 3 can intercept the phosphogypsum 2 and allow phosphoric acid to pass through.
Further, in the above apparatus for vacuum filtration defluorination while hot in phosphoric acid production, the phosphoric acid liquid level in the phosphoric acid tank 7 needs to be higher than the lowest position of the phosphoric acid conduit 8, and the fluosilicic acid liquid level in the fluosilicic acid tank 10 is higher than the lowest position of the fluosilicic acid conduit 14.
Further, in the above apparatus for vacuum filtration defluorination in phosphoric acid production while hot, the screen 4 is closely attached to the filter cloth 3.
Further, in the above apparatus for filtering and defluorinating under vacuum while hot in phosphoric acid production, the filler filled below the screen 4 is phosphoric acid filler.
Further, in the above apparatus for vacuum filtration defluorination while hot in phosphoric acid production, the phosphoric acid packing is Raschig ring.
Further, the vacuum filtration defluorination device for producing phosphoric acid while the phosphoric acid is hot also comprises a heat preservation device. The heat preservation device adopts one of the prior art. The vacuum filtration means is to use a heat preservation device for heat preservation. In addition, the prior art is adopted in all the contents which are not described in detail in the application.
When the device is used, the device for vacuum filtration defluorination in phosphoric acid production is used, the mixed solution 1 of high-temperature phosphoric acid and phosphogypsum 2 obtained by the reaction of phosphorite slurry and sulfuric acid is firstly filtered in a filter 6 in vacuum when the phosphoric acid is hot, the hot filtrate flows along the surface of the phosphoric acid filler 5 in a vacuum chamber, and then vacuum filtration steam is pumped into an elution tower 13 to be eluted by water to obtain the fluosilicic acid. The device further extracts fluorine entering phosphoric acid and phosphogypsum, and can improve the utilization rate of the fluorine by 3-5%.
It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Finally, it should be noted that: the above embodiments are only used for illustrating but not limiting the technical solutions of the present invention, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, and the appended claims are intended to cover such modifications and equivalents as fall within the spirit and scope of the invention.
Claims (8)
1. The device for vacuum filtration defluorination in phosphoric acid production while hot comprises a filter, an elution tower and a spray head, and is characterized in that a vacuum pump connecting port is formed in the upper portion of the elution tower, filler is filled below the spray head and the vacuum pump connecting port, a cavity of the elution tower is reserved below the filler, a fluosilicic acid guide pipe is connected to the bottom of the elution tower and is inserted into a fluosilicic acid tank, filter cloth is connected to the upper portion of the filter, a screen is connected to the lower portion of the filter cloth, the filler is filled below the screen, a cavity of the filter is reserved below the filler, a phosphoric acid guide pipe is connected to the bottom of the filter and is inserted into the phosphoric acid tank, and the cavity of the.
2. The apparatus for hot vacuum filtration defluorination in phosphoric acid production according to claim 1, wherein the phosphoric acid level in said filter cavity does not exceed the lowest orifice of said filtrate line and the fluosilicic acid level in said elution column cavity does not exceed the lowest orifice of said filtrate line.
3. The apparatus for hot vacuum filtration defluorination in phosphoric acid production according to claim 1, wherein said screen is placed next to the filter cloth.
4. The apparatus for filtering and defluorinating under vacuum while hot in the production of phosphoric acid according to claim 1, wherein the filler filled under the screen mesh is phosphoric acid filler.
5. The apparatus for hot vacuum filtration defluorination in phosphoric acid production according to claim 1, wherein said filter cloth is capable of retaining phosphogypsum while allowing phosphoric acid to pass through.
6. The apparatus for filtering and defluorinating under vacuum while still hot in the production of phosphoric acid according to claim 1, wherein the phosphoric acid level in the phosphoric acid tank is higher than the lowest position of the phosphoric acid conduit, and the fluosilicic acid level in the fluosilicic acid tank is higher than the lowest position of the fluosilicic acid conduit.
7. The apparatus for filtering and defluorinating under vacuum while hot in the production of phosphoric acid of claim 4, wherein the phosphoric acid packing is Raschig rings.
8. The apparatus for filtering and defluorinating under vacuum while hot in the production of phosphoric acid according to claim 1, further comprising a temperature maintenance device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021758056.0U CN212269466U (en) | 2020-08-21 | 2020-08-21 | Vacuum filtration defluorination device for hot phosphoric acid production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021758056.0U CN212269466U (en) | 2020-08-21 | 2020-08-21 | Vacuum filtration defluorination device for hot phosphoric acid production |
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| Publication Number | Publication Date |
|---|---|
| CN212269466U true CN212269466U (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021758056.0U Expired - Fee Related CN212269466U (en) | 2020-08-21 | 2020-08-21 | Vacuum filtration defluorination device for hot phosphoric acid production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111960395A (en) * | 2020-08-21 | 2020-11-20 | 黄冈师范学院 | Method and device for vacuum filtration defluorination in phosphoric acid production |
-
2020
- 2020-08-21 CN CN202021758056.0U patent/CN212269466U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111960395A (en) * | 2020-08-21 | 2020-11-20 | 黄冈师范学院 | Method and device for vacuum filtration defluorination in phosphoric acid production |
| CN111960395B (en) * | 2020-08-21 | 2024-05-28 | 黄冈师范学院 | Method and device for removing fluorine in hot vacuum filtration in phosphoric acid production |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210101 Termination date: 20210821 |
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| CF01 | Termination of patent right due to non-payment of annual fee |