CN110585782A - Phosphoric acid slurry filtering system and phosphoric acid slurry filtering method - Google Patents
Phosphoric acid slurry filtering system and phosphoric acid slurry filtering method Download PDFInfo
- Publication number
- CN110585782A CN110585782A CN201910893894.4A CN201910893894A CN110585782A CN 110585782 A CN110585782 A CN 110585782A CN 201910893894 A CN201910893894 A CN 201910893894A CN 110585782 A CN110585782 A CN 110585782A
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- Prior art keywords
- washing
- area
- pipe
- filtering
- return pipe
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/35—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition
- B01D33/41—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition in series connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/60—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for washing
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
Abstract
The invention discloses a phosphoric acid slurry filtering system which comprises a rotary table filter, wherein the rotary table filter comprises a primary filtering area, a first washing area, a second washing area, a third washing area and a filter cloth regeneration area; a feeding pipe is arranged on the primary filtering area; the primary filtering area, the filtering area and the first washing area are connected with a liquid discharge pipe, the second washing area is connected with a first return pipe flowing to the first washing area, and the third washing area is connected with a second return pipe flowing to the second washing area; the primary filtering area, the first washing area, the second washing area and the third washing area are all connected with a gas-liquid separator through gas outlet pipes; the filter cloth regeneration area is communicated with the gypsum repulping tank. Filtering and three-stage washing are adopted, and washing water is recycled. The ardealite is washed and filtered fully and efficiently, and the content of phosphorus pentoxide in the ardealite is reduced. The application also provides a phosphoric acid slurry filtering method.
Description
Technical Field
The invention relates to the technical field of phosphoric acid production, in particular to a phosphoric acid slurry filtering system and a phosphoric acid slurry filtering method.
Background
Phosphogypsum is industrial waste residue generated when phosphoric ore is extracted by sulfuric acid in wet-process phosphoric acid production, and about 5 tons of phosphogypsum are discharged per 1 ton of phosphoric acid produced. If the phosphogypsum waste residue is not recycled, the phosphogypsum waste residue is directly treated in a stacking and landfill mode, which not only wastes resources and occupies land, but also has great harm to the environment.
Because the phosphoric acid slurry after phosphoric acid filtration contains phosphorus pentoxide, when the phosphoric acid slurry is recycled, in the process of conversion reaction with ammonium carbonate, colloidal substances are easily generated due to the existence of the phosphorus pentoxide, and the colloidal substances prevent the growth of the crystal particles of the product calcium carbonate, block the filter cloth in the solid-liquid separation process and influence the normal production of the device. Therefore, the phosphoric acid slurry is washed and filtered once before being used, so as to reduce the content of the phosphorus pentoxide.
As for the problem, the current purification method is to directly introduce phosphoric acid slurry into a filter for filtration and then add washing water for secondary washing. However, because the crystal of the phosphogypsum is broken, a large amount of phosphorus pentoxide still remains after washing, the purity requirement of the subsequent process is difficult to meet, the phosphogypsum cannot be recycled smoothly, and the application scene of the phosphogypsum is limited.
Disclosure of Invention
In view of the above, the present application provides a phosphoric acid slurry filtration system, which employs filtration and three-stage washing, and makes the washing liquid flow back for use. The ardealite is fully and efficiently washed and filtered, and the content of phosphorus pentoxide is reduced. The application also provides a phosphoric acid slurry filtering method.
In order to solve the technical problems, the technical scheme provided by the invention is that the phosphoric acid slurry filtering system comprises a rotary table filter, wherein the rotary table filter comprises a primary filtering area, a first washing area, a second washing area, a third washing area and a filter cloth regeneration area; a feeding pipe is arranged on the primary filtering area; the primary filtering area, the filtering area and the first washing area are connected with a liquid discharge pipe, the second washing area is connected with a first return pipe flowing to the first washing area, and the third washing area is connected with a second return pipe flowing to the second washing area; the primary filtering area, the first washing area, the second washing area and the third washing area are all connected with a gas-liquid separator through gas outlet pipes; the filter cloth regeneration area is communicated with the gypsum repulping tank.
Preferably, the pipelines of the first return pipe and the second return pipe are provided with additional pumps; and a spray head is arranged on the filter cloth regeneration area.
Preferably, the third washing area is connected with a washing water pipe; and the feeding pipe, the first return pipe, the second return pipe and the washing water pipe are all provided with a steady flow water tank.
Preferably, the liquid phase pipeline of the gas-liquid separator is communicated with the second return pipe; the first return pipe is communicated with a liquid discharge pipe of the first washing area through a first flow dividing pipe, and an opening and closing valve is arranged on the first return pipe and the first flow dividing pipe; the second return pipe is communicated with the first return pipe through a second shunt pipe, and an opening and closing valve is arranged on the second return pipe and the second shunt pipe.
Preferably, a gypsum hopper is arranged between the filter cloth regeneration area and the gypsum repulping tank.
The invention also provides a phosphoric acid slurry filtering method, which comprises the following steps:
the reaction slurry enters a primary filtering area to be filtered to obtain a filter cake and primary filtering filtrate, and the primary filtering filtrate is discharged through a liquid discharge pipe of the primary filtering area;
the filter cake enters a filtering area for filtering, and filtered filtrate is discharged through a liquid discharge pipe of the filtering area;
the filter cake enters a first washing area, washing water is injected to wash the filter cake, and first filtrate obtained after washing is discharged through a liquid discharge pipe of the first washing area;
the filter cake enters a second washing area, and second washing water is injected to wash the filter cake, a second filtrate obtained after washing is the first washing water, and the first washing water is injected into the first washing area through a first return pipe;
the filter cake enters a third washing area, and third washing water is injected to wash the filter cake, a third filtrate obtained after washing is the second washing water, and the second washing water is injected into the second washing area through a second return pipe;
discharging the filter cake from the filter cloth regeneration zone; and washing the filter cloth to obtain filter cloth washing water, and injecting the filter cloth washing water into the gypsum repulping tank.
Preferably, the primary filter filtrate and the first filtrate are mixed and then discharged to an acid return pipe; and discharging the filtrate to a dilute acid tank, or discharging the filtrate to an acid return pipe after mixing with the first filtrate.
Preferably, the gases discharged from the primary filtering area, the first washing area, the second washing area and the third washing area are all conveyed to a gas-liquid separator through gas outlet pipes, the gases separated from the gas-liquid separator are discharged, and the liquid separated from the gas-liquid separator is mixed with the three washing water and then injected into the second washing area.
Preferably, the filter cake is discharged from the filter cloth regeneration zone; washing the filter cloth to obtain filter cloth washing water, and injecting the filter cloth washing water into a gypsum repulping tank, wherein the filter cloth washing water comprises the following steps: and unloading the filter cake into a gypsum hopper, washing the gypsum hopper to obtain gypsum washing water, and injecting the gypsum washing water and the filter cloth washing water into a gypsum repulping tank.
Compared with the prior art, the application has the beneficial effects that:
washing is carried out for multiple times in a subarea, and the washing liquid in the next washing area is returned to the previous washing area as the inlet water for washing, so that the phosphoric acid slurry can be more fully washed and filtered, the content of phosphorus pentoxide in the phosphogypsum is reduced, and the product quality is improved.
Set up booster pump and stationary flow water tank, can make the washing liquid flow of injection more stable, avoid the undulant impact that produces of water injection volume to influence and wash filtration quality. The spray header of the filter cloth regeneration area sprays the washing water flow to the filter cloth uniformly, so that the filter cloth can be washed and regenerated more thoroughly.
The first shunt pipe and the second shunt pipe are arranged, when the washing liquid flows back to cause the water inflow of the previous washing area to be excessive, the state of the on-off valve is changed, the reflux liquid in the first reflux pipe and the second reflux pipe is directly discharged and does not enter the washing area any more, and the water flow in the filtering system is effectively controlled.
Drawings
FIG. 1 is a schematic diagram of the phosphoric acid slurry filtration system of the present invention.
Reference numerals: the device comprises a primary filtering area 11, a filtering area 12, a first washing area 13, a second washing area 14, a third washing area 15, a filter cloth regeneration area 16, a gypsum hopper 17, a feeding pipe 21, a liquid discharge pipe 22, a first return pipe 23, a second return pipe 24, a washing water pipe 25, a first branch pipe 26, a second branch pipe 27, an air outlet pipe 31, a gas-liquid separator 32, a gas phase pipeline 33, a liquid phase pipeline 34, a booster pump 41, a steady flow water tank 42, an on-off valve 43, a spray head 44, an acid return pipe 51, a dilute acid tank 52 and a gypsum repulping tank 53.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the present embodiment provides a phosphoric acid slurry filtering system, which includes a rotary table filter, wherein the rotary table filter includes a primary filtering area 11, a filtering area 12, a first washing area 13, a second washing area 14, a third washing area 15, and a filter cloth regeneration area 16. A feeding pipe 21 is arranged on the primary filtering area 11; the primary filtering area 11, the filtering area 12 and the first washing area 13 are connected with a liquid discharge pipe 22; the second washing section 14 is connected with a first return pipe 23 flowing to the first washing section 13, and the third washing section 15 is connected with a second return pipe 24 flowing to the second washing section 14; the pipelines of the first return pipe 23 and the second return pipe 24 are provided with an additional pump 41; the third washing area 15 is connected with a washing water pipe 25; the feed pipe 21, the first return pipe 23, the second return pipe 24 and the washing water pipe 25 are all provided with a steady flow water tank 42. The filter cloth regeneration zone 16 is provided with a spray header 44, the filter cloth regeneration zone 16 is communicated with a gypsum repulping tank 53, and a gypsum hopper 17 is arranged between the filter cloth regeneration zone 16 and the gypsum repulping tank 5.
The primary filtering area 11, the filtering area 12, the first washing area 13, the second washing area 14 and the third washing area 15 are all connected with a gas-liquid separator 32 through an air outlet pipe 31. The liquid phase conduit 34 of the gas-liquid separator 32 communicates with the second return conduit 24; the first return pipe 23 is communicated with a liquid discharge pipe of the first washing section 13 through a first shunt pipe 26, and an opening and closing valve 43 is arranged on the first return pipe 23 and the first shunt pipe 26; the second return pipe 24 and the first return pipe 23 are communicated with each other through a second branch pipe 27, and an opening/closing valve 43 is provided in the second return pipe 24 and the second branch pipe 27.
The embodiment also provides a phosphoric acid slurry filtering method based on the phosphoric acid slurry filtering system, which comprises the following steps:
the reaction slurry enters the primary filtering area 11 through a feeding pipe 21 and is filtered to obtain a filter cake and primary filtering filtrate, and the primary filtering filtrate is discharged through a liquid discharge pipe 22 of the primary filtering area 11;
the filter cake enters the filtering area 12 for filtering, and the filtered filtrate is discharged through a liquid discharge pipe 22 of the filtering area 12;
the filter cake enters the first washing area 13, washing water is injected to wash the filter cake, and first filtrate obtained after washing is discharged through a liquid discharge pipe 22 of the first washing area 13; the primary filtrate and the primary filtrate are mixed and then discharged to the acid return pipe 51 through the liquid discharge pipe 22; the filtrate is discharged to the dilute acid tank 52 through the corresponding drain pipe 22, or is discharged to the acid return pipe 51 after being mixed with the first filtrate.
The filter cake enters a second washing area 14, and secondary washing water is injected to wash the filter cake, a second filtrate obtained after washing is the primary washing water, and the primary washing water is injected into the first washing area 13 through a first return pipe 23;
the filter cake enters a third washing area 15, and third washing water is injected through a washing water pipe 25 to wash the filter cake, a third filtrate obtained after washing is the second washing water, and the second washing water is injected into a second washing area 14 through a second return pipe 24;
the gas discharged from the primary filtering area 11, the filtering area 12, the first washing area 13, the second washing area 14 and the third washing area 15 is conveyed to a gas-liquid separator 32 through a gas outlet pipe 31, the gas separated from the gas-liquid separator 32 is discharged from a gas-phase pipeline 33, and the liquid separated from the gas-liquid separator 32 is mixed with the three washing water through a liquid-phase pipeline 34 and then is injected into the second washing area 14 through a second return pipe 24.
Unloading the filter cake from the filter cloth regeneration zone 16 into a gypsum hopper 17, washing the gypsum hopper 17 to obtain gypsum washing water, and injecting the gypsum washing water and the filter cloth washing water into the gypsum repulping tank 5; the discharged filter cloth enters a filter cloth regeneration area 16, and a spray head 44 sprays clean water to wash the filter cloth to obtain filter cloth washing water, and the filter cloth washing water is injected into the gypsum repulping tank 5.
According to the phosphoric acid slurry filtering system and the phosphoric acid slurry filtering method provided by the embodiment, the filter liquor is washed for multiple times on the rotary table type filter, and the moisture carried in the discharged gas is fully utilized, so that the phosphogypsum is washed and filtered fully and efficiently, phosphorus pentoxide impurities contained in the phosphogypsum are effectively washed, the subsequent processes are convenient to recycle, and the quality of the phosphoric acid slurry is improved.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (9)
1. A phosphoric acid slurry filtering system is characterized by comprising a rotary table filter, wherein the rotary table filter comprises a primary filtering area, a first washing area, a second washing area, a third washing area and a filter cloth regeneration area; a feeding pipe is arranged on the primary filtering area; the primary filtering area, the filtering area and the first washing area are connected with a liquid discharge pipe, the second washing area is connected with a first return pipe flowing to the first washing area, and the third washing area is connected with a second return pipe flowing to the second washing area; the primary filtering area, the first washing area, the second washing area and the third washing area are all connected with a gas-liquid separator through gas outlet pipes; the filter cloth regeneration area is communicated with the gypsum repulping tank.
2. The phosphoric acid slurry filtering system according to claim 1, wherein the first return pipe and the second return pipe are provided with additional pumps; and a spray head is arranged on the filter cloth regeneration area.
3. The phosphoric acid slurry filtration system of claim 2, wherein a wash water pipe is connected to the third wash zone; and the feeding pipe, the first return pipe, the second return pipe and the washing water pipe are all provided with a steady flow water tank.
4. The phosphoric acid slurry filtering system according to claim 1, wherein the liquid phase conduit of the gas-liquid separator is in communication with a second return conduit; the first return pipe is communicated with a liquid discharge pipe of the first washing area through a first flow dividing pipe, and an opening and closing valve is arranged on the first return pipe and the first flow dividing pipe; the second return pipe is communicated with the first return pipe through a second shunt pipe, and an opening and closing valve is arranged on the second return pipe and the second shunt pipe.
5. The phosphoric acid slurry filtration system of claim 1, wherein a gypsum hopper is disposed between the filter cloth regeneration zone and the gypsum repulping tank.
6. A phosphoric acid slurry filtering method is characterized by comprising the following steps:
the reaction slurry enters a primary filtering area to be filtered to obtain a filter cake and primary filtering filtrate, and the primary filtering filtrate is discharged through a liquid discharge pipe of the primary filtering area;
the filter cake enters a filtering area for filtering, and filtered filtrate is discharged through a liquid discharge pipe of the filtering area;
the filter cake enters a first washing area, washing water is injected to wash the filter cake, and first filtrate obtained after washing is discharged through a liquid discharge pipe of the first washing area;
the filter cake enters a second washing area, and second washing water is injected to wash the filter cake, a second filtrate obtained after washing is the first washing water, and the first washing water is injected into the first washing area through a first return pipe;
the filter cake enters a third washing area, and third washing water is injected to wash the filter cake, a third filtrate obtained after washing is the second washing water, and the second washing water is injected into the second washing area through a second return pipe;
discharging the filter cake from the filter cloth regeneration zone; and washing the filter cloth to obtain filter cloth washing water, and injecting the filter cloth washing water into the gypsum repulping tank.
7. The phosphoric acid slurry filtration method according to claim 6, wherein the primary filtrate is mixed with the primary filtrate and discharged to the acid return pipe; and discharging the filtrate to a dilute acid tank, or discharging the filtrate to an acid return pipe after mixing with the first filtrate.
8. The method for filtering phosphoric acid slurry according to claim 6, wherein the gas discharged from the primary filtering zone, the first washing zone, the second washing zone and the third washing zone is supplied to the gas-liquid separator through a gas outlet pipe, the gas separated in the gas-liquid separator is discharged, and the liquid separated in the gas-liquid separator is mixed with the third washing water and then is injected into the second washing zone.
9. The phosphoric acid slurry filtration method of claim 6, wherein the filter cake is discharged from the filter cloth regeneration zone; washing the filter cloth to obtain filter cloth washing water, and injecting the filter cloth washing water into a gypsum repulping tank, wherein the filter cloth washing water comprises the following steps: and unloading the filter cake into a gypsum hopper, washing the gypsum hopper to obtain gypsum washing water, and injecting the gypsum washing water and the filter cloth washing water into a gypsum repulping tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910893894.4A CN110585782A (en) | 2019-09-20 | 2019-09-20 | Phosphoric acid slurry filtering system and phosphoric acid slurry filtering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910893894.4A CN110585782A (en) | 2019-09-20 | 2019-09-20 | Phosphoric acid slurry filtering system and phosphoric acid slurry filtering method |
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| Publication Number | Publication Date |
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| CN110585782A true CN110585782A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910893894.4A Pending CN110585782A (en) | 2019-09-20 | 2019-09-20 | Phosphoric acid slurry filtering system and phosphoric acid slurry filtering method |
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| CN106006697A (en) * | 2016-05-19 | 2016-10-12 | 湖北六国化工股份有限公司 | Phosphate tailings acidolysis pilot-test apparatus and process |
| CN206295680U (en) * | 2016-12-15 | 2017-07-04 | 灵宝金源晨光有色矿冶有限公司 | A kind of ardealite filter protector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1092183A (en) * | 1964-04-16 | 1967-11-22 | Metallgesellschaft Ag | Improvements in or relating to continuous filters |
| CN102390821A (en) * | 2011-08-08 | 2012-03-28 | 云南云天化国际化工股份有限公司 | Method for producing dihydrate wet-process phosphoric acid |
| CN202876503U (en) * | 2012-09-23 | 2013-04-17 | 山东贝特尔环保科技有限公司 | Belt type vacuum filter |
| CN203183794U (en) * | 2013-04-03 | 2013-09-11 | 杭州化工机械有限公司 | Pressure rotary table filter |
| CN203333301U (en) * | 2013-07-18 | 2013-12-11 | 四川蓥峰实业有限公司 | Washing and filtering system of phosphoric acid rotary table |
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Application publication date: 20191220 |
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