CN110921642A - Method and device for treating phosphoric acid slurry by wet process - Google Patents
Method and device for treating phosphoric acid slurry by wet process Download PDFInfo
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- CN110921642A CN110921642A CN201911312222.6A CN201911312222A CN110921642A CN 110921642 A CN110921642 A CN 110921642A CN 201911312222 A CN201911312222 A CN 201911312222A CN 110921642 A CN110921642 A CN 110921642A
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- tank
- plate frame
- slurry
- pressing
- slag
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 164
- 239000002002 slurry Substances 0.000 title claims abstract description 120
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000003825 pressing Methods 0.000 claims abstract description 105
- 239000002893 slag Substances 0.000 claims abstract description 81
- 239000002253 acid Substances 0.000 claims abstract description 50
- 238000003860 storage Methods 0.000 claims abstract description 38
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 239000010440 gypsum Substances 0.000 claims abstract description 12
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 24
- 238000004513 sizing Methods 0.000 claims description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005352 clarification Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 claims description 3
- 239000002426 superphosphate Substances 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 11
- 239000011574 phosphorus Substances 0.000 abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical group O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract 2
- 239000010802 sludge Substances 0.000 abstract 1
- 230000029087 digestion Effects 0.000 description 8
- 239000007787 solid Substances 0.000 description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 150000004683 dihydrates Chemical class 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000012066 reaction slurry Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
-
- 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
- C01B25/234—Purification; Stabilisation; Concentration
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
- C05B1/02—Superphosphates
Abstract
The invention discloses a method for treating phosphoric acid slurry by a wet method, which comprises the steps of continuously discharging and storing concentrated phosphoric acid settling slurry in a frequency conversion mode, then conveying the stored slurry to two newly-added primary filter presses for filter pressing separation, returning clear acid to a temporary storage tank, then returning to a clarifying tank, manually discharging primary filter press residues, conveying the primary filter press residues into two newly-added secondary filter press filters for filter pressing separation after stirring and repulping, returning the clear acid to a temporary storage tank, then conveying the secondary filter press residues into a repulping tank for stirring and repulping through manual discharging, conveying the secondary filter press residues into a filter gypsum repulping tank, and conveying the filter gypsum repulping tank to a phosphogypsum residue field. The problem that the phosphorus loss is large in the process of digesting concentrated phosphoric acid slurry in the company at present is solved, the phosphorus in the sludge is effectively recovered, the quality of the total phosphorus reduction of the phosphogypsum is improved, the treatment cost is reduced for the utilization of gypsum produced by slag in order in future, and the method has good social benefit and economic benefit.
Description
Technical Field
The present invention relates to phosphoric acid, and more particularly, to a concentrated phosphoric acid slurry treatment apparatus for wet-process phosphoric acid.
Background
It is known that in the process of producing dihydrate wet-process phosphoric acid, impurities such as calcium sulfate and the like in the concentration process of dilute phosphoric acid are separated out along with the increase of the concentration of concentrated phosphoric acid, solid-phase particles are formed and discharged to a storage tank along with the concentrated phosphoric acid for storage, and in order to effectively control the solid content of the concentrated phosphoric acid, the solid-phase impurities are generally collected and discharged by the storage tank with a rotary rake. The product structure of the malplace base of the current Vanfu (group) Limited liability company is mainly PPA, high-point DAP and phosphate, so that the solid content requirement of concentrated phosphoric acid is higher, the concentrated phosphoric acid is generally controlled according to the content of less than or equal to 1 percent, and the average discharge amount of concentrated phosphoric acid slurry is 12m to ensure the product quality of a downstream product production device3And/h, and digestion of the slurry after it is produced becomes a current problem.
In the existing slurry digestion treatment technology, the main digestion treatment modes of the slurry are MAP digestion and return reaction tank, MAP digestion is a better method for recycling slurry phosphorus, but MAP stops producing after the structure of a product of Vanfu is adjusted. The slurry returning to the reaction tank affects the viscosity of the reaction slurry, so that the gypsum is difficult to filter and wash, and the total phosphorus increase value is 0.2 percent through a plurality of data tests, while the gypsum amount is very large, and the phosphorus loss of the slurry returning to the reaction tank is very large through accounting. For this reason, a more suitable treatment method is urgently required for the digestion treatment of the dihydrate wet phosphoric acid slurry.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a device for digesting concentrated phosphoric acid slurry in a wet-process phosphoric acid production process.
The digestion treatment method of the wet-process phosphoric acid concentrated phosphoric acid slurry provided by the inventor comprises the following steps:
(1) concentrated phosphoric acid slurry collection and storage
Conveying the concentrated phosphoric acid slurry collected by the rotary rake at the bottom of the concentrated phosphoric acid tank to a slurry tank by a slurry pump for storage;
(2) plate and frame one-time press filtering of concentrated phosphoric acid slurry
Conveying the slurry in a concentrated phosphoric acid slurry storage tank to a primary filter-pressing plate frame feeding through a plate frame slurry feeding pump, squeezing and back blowing by using a plate frame, loosening and discharging slag, naturally flowing the clear liquid after filter-pressing of the slurry to a plate frame-pressing acid cleaning tank for temporary storage, transferring the clear liquid to a clarifying tank by using a plate frame-pressing acid cleaning pump according to the liquid level of the plate frame-pressing acid cleaning tank, dropping the discharged plate frame-pressing filter slag into a hopper grid, cutting into blocks, then dropping into a plate frame-pressing slag repulping tank, adding a fixed amount of tank water, stirring and repulping;
(3) slurry primary slag pressing secondary filter pressing
Repulping the first pressing slag of the concentrated phosphoric acid slurry after plate-frame filter pressing, conveying the slurry to a secondary filter pressing plate-frame feeding by using a first pressing slag repulping pump, squeezing and back blowing by using a plate frame, loosening and discharging slag, naturally refluxing the clear liquid of the slurry after filter pressing to a plate-frame secondary-pressure acid cleaning tank for temporary storage, transferring the clear liquid to a dilute phosphoric acid tank by using a plate-frame secondary-pressure acid cleaning pump according to the liquid level of the secondary-pressure acid cleaning tank, dropping the discharged plate-frame pressing slag into a hopper grid cutting block, then dropping the cut block into a plate-frame secondary-pressure slag repulping tank, adding pool water, stirring, repulping, and conveying the slurry to a;
(4) production of ordinary superphosphate from slurry-pressed slag
The method comprises the steps of conveying slurry in a concentrated phosphoric acid slurry storage tank to a primary filter-pressing plate frame feeding pump through a plate frame slurry feeding pump, squeezing by using a plate frame, back blowing, loosening and discharging slag, naturally refluxing the filtered clear liquid of the slurry to a plate frame-pressure acid cleaning tank for temporary storage, conveying the clear liquid to a clarification tank by using a plate frame-pressure acid cleaning pump according to the liquid level of the plate frame-pressure acid cleaning tank, wherein the plate frame is designed into a detachable hopper, the repulping tank is a movable repulping tank, the partial hopper and the repulping tank are detached when the ordinary calcium market is in a busy season, and the slag is directly processed by using an automobile to transport the ordinary calcium.
The invention has the beneficial effects that:
after the method is adopted, the problem of large phosphorus loss in the current digestion treatment of the concentrated phosphoric acid slurry is solved, the slurry is digested into calcium fertilizer by using a common calcium device after being subjected to primary filter pressing, the economic value is relatively high, the quality of phosphogypsum is improved, the recovery of phosphorus in the slurry is also high due to secondary filter pressing, the influence of the slurry returning to a reaction tank on the phosphorus loss of the whole gypsum system is effectively reduced, the treatment cost is reduced for the utilization of gypsum which is produced at fixed production by slag in the future, and the method has good social benefit and economic benefit.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
in the figure: 1, 2-concentrated phosphoric acid clarifying tank with rake; 3-concentrated phosphoric acid slurry storage tank; 4-a plate frame-pressure acid cleaning tank; 5-plate frame II-pressing acid cleaning tank; 6, 7-plate frame one-slag pressing repulping tank; 8, 9-plate frame secondary slag pressing and repulping tank; 10, 11-concentrated phosphoric acid clarifying tank slurry pump; 12-plate frame slurry feed pump; 13-a plate frame-pressure acid cleaning pump; 14-plate frame one-pressure slurry pump; 15-plate frame two-pressure acid cleaning pump; 16-plate frame secondary pressing slurry pump; 17, 18-primary press filtration plate frame; 19, 20-secondary press filtration plate frame; 21, 22-plate frame one-slag pressing discharging hopper; 23, 24-plate frame secondary slag pressing discharging hopper; 25, 26-plate frame-slag pressing repulping tank stirrer; 27, 28-plate frame secondary slag pressing repulping tank stirrer.
Detailed Description
Phosphoric acid plant of phosphoric acid operation department of a company.
(1) Concentrated phosphoric acid slurry collection and storage
And (3) continuously conveying the concentrated phosphoric acid slurry with the solid content of 19 percent collected by the rotary rake at the bottom of the concentrated phosphoric acid tank to a slurry tank by using a slurry pump for storage.
In order to better ensure the stable operation of the storage tank rotating harrow and reduce the fluctuation of the quality of concentrated phosphoric acid products, a DN40 stainless steel discharge pipe is designed, the continuous and stable discharge is realized by adjusting the frequency of a pump according to the solid content of slurry, the existing storage tank is utilized for storage, and the problems of short operating period of the rotating harrow and large fluctuation of the solid content of the slurry in the previous large-flow interval discharge process are solved.
(2) Plate and frame one-time press filtering of concentrated phosphoric acid slurry
The slurry in the concentrated phosphoric acid slurry storage tank is conveyed to the primary filter pressing plate frame feeding through a plate frame slurry feeding pump, the plate frame is utilized to squeeze and back blow, then the slag is discharged through loosening, the clear liquid after filter pressing naturally flows to a plate frame-pressure acid cleaning tank for temporary storage, the clear liquid is transferred to a clarification tank through a plate frame-pressure acid cleaning pump according to the liquid level of the plate frame-pressure acid cleaning tank, the discharged plate frame pressure filter slag falls into a hopper grid and is cut into blocks and then falls into a plate frame-pressure slag repulping tank, and the quantitative tank water is added for stirring and repulping.
(3) Slurry primary slag pressing secondary filter pressing
Repulping the primary pressing slag of the concentrated phosphoric acid slurry after filter pressing by a plate frame, conveying the slurry to a secondary filter pressing plate frame by a primary pressing slag repulper for feeding, squeezing and back blowing by the plate frame, loosening and discharging slag, and obtaining clear liquid (P) after filter pressing of the slurry2O5Concentration is about 18 percent) naturally flows back to the plate frame secondary pressure acid cleaning tank for temporary storage, the plate frame secondary pressure acid cleaning pump is utilized to transfer to the dilute phosphoric acid tank according to the liquid level of the secondary pressure acid cleaning tank, the unloaded plate frame pressure filter residue (total phosphorus is less than or equal to 9 percent) falls into the plate frame secondary pressure residue repulping tank after falling into the hopper grid cutting block, the tank water is added, the mixture is stirred and repulped, and then the mixture is conveyed to the filtration gypsum repulping tank.
(4) Production of ordinary superphosphate from slurry-pressed slag
The method comprises the steps of conveying slurry in a concentrated phosphoric acid slurry storage tank to a primary filter-pressing plate frame feeding pump through a plate frame slurry feeding pump, squeezing by using a plate frame, loosening and discharging slag after back flushing, naturally refluxing the slurry to a plate frame-pressing acid cleaning tank for temporary storage after filter pressing, conveying to a clarification tank by using a plate frame-pressing acid cleaning pump according to the liquid level of the plate frame-pressing acid cleaning tank, designing a detachable hopper and a movable repulping tank on the plate frame, detaching the lower hopper and the repulping tank when the common calcium market is in a busy season, and directly processing the common calcium by using an automobile to transport the slag.
The device adopted for realizing the method comprises a concentrated phosphoric acid clarifying tank I1 and a concentrated phosphoric acid clarifying tank II 2; a concentrated phosphoric acid slurry storage tank 3; a plate frame I pressure acid cleaning tank 4; a plate frame II pressure acid cleaning tank 5; a plate frame I slag pressing and slurry re-sizing tank I6 and a plate frame I slag pressing and slurry re-sizing tank II 7; a plate frame secondary slag pressing repulping tank I8 and a plate frame secondary slag pressing repulping tank II 9; a concentrated phosphoric acid clarifying tank slurry pump I10 and a concentrated phosphoric acid clarifying tank slurry pump II 11; a plate and frame slurry feed pump 12; a plate frame-pressure acid cleaning pump 13; a plate frame one-pack slurry pump 14; a plate frame second pressure acid cleaning pump 15; a plate frame secondary pressing slurry pump 16; primary filter pressing of the plate frame I17 and primary filter pressing of the plate frame II 18; a secondary filter press plate frame I19 and a secondary filter press plate frame II 20; a plate frame one-pressing slag discharging hopper I21 and a plate frame one-pressing slag discharging hopper II 22; a plate frame secondary slag pressing discharging hopper I23 and a plate frame secondary slag pressing discharging hopper II 24; the concentrated phosphoric acid clarifying tank I1 and the concentrated phosphoric acid clarifying tank II 2 are respectively connected to a concentrated phosphoric acid slurry storage tank 3 through a concentrated phosphoric acid clarifying tank slurry pump I10 at the conical bottom, and a concentrated phosphoric acid clarifying tank slurry pump II 11, and the concentrated phosphoric acid slurry storage tank 3 is provided with a stirrer;
the plate frame slurry feeding pump 12 is connected to a first filter pressing plate frame I17 and a first filter pressing plate frame II 18, a plate frame first pressure acid cleaning pump 13 of the plate frame first pressure acid cleaning tank 4 is connected to a second concentrated phosphoric acid clarifying tank 2 with a rotary rake, a plate frame first pressure slag repulping tank I6, a plate frame first pressure slag slurry pump 14 of a plate frame first pressure slag repulping tank II 7 are connected to a second filter pressing plate frame I19, a second filter pressing plate frame II 20, a plate frame second pressure acid cleaning pump 15 of the plate frame second pressure acid cleaning tank 5 is connected to a dilute phosphoric acid storage tank, a plate frame second pressure slag repulping tank I8, and a plate frame second pressure slag repulping tank II 9 is connected to a filter gypsum repulping tank 16.
The plate frame-first slag pressing and slurry re-sizing tank I6 is provided with a plate frame-first slag pressing and slurry re-sizing tank stirrer I25, and the plate frame-first slag pressing and slurry re-sizing tank II 7 is provided with a plate frame-first slag pressing and slurry re-sizing tank stirrer II 26; the plate frame secondary slag pressing and slurry re-sizing tank I8 is provided with a plate frame secondary slag pressing and slurry re-sizing tank stirrer I27, and the plate frame secondary slag pressing and slurry re-sizing tank II 9 is provided with a plate frame secondary slag pressing and slurry re-sizing tank stirrer II 28.
By adopting the method and the device, the rotating rake of the phosphoric acid clarifying tank runs stably for a long period, the quality of the clarifying acid is effectively controlled, and the amount of slurry returning to the reaction tank is reduced, so that the total phosphorus in gypsum is reduced, the quality of the phosphogypsum is improved, the gypsum treatment cost of phosphogypsum 'production by slag' in future is effectively reduced, and a good direction is found for a phosphoric acid slag discharging system.
Claims (3)
1. A method of treating a wet process phosphoric acid slurry, comprising the steps of:
(1) concentrated phosphoric acid slurry collection and storage
Conveying the concentrated phosphoric acid slurry collected by the rotary rake at the bottom of the concentrated phosphoric acid tank to a slurry tank by a slurry pump for storage;
(2) plate and frame one-time press filtering of concentrated phosphoric acid slurry
Conveying the slurry in a concentrated phosphoric acid slurry storage tank to a primary filter-pressing plate frame feeding through a plate frame slurry feeding pump, squeezing and back blowing by using a plate frame, loosening and discharging slag, naturally flowing the clear liquid after filter-pressing of the slurry to a plate frame-pressing acid cleaning tank for temporary storage, transferring the clear liquid to a clarifying tank by using a plate frame-pressing acid cleaning pump according to the liquid level of the plate frame-pressing acid cleaning tank, dropping the discharged plate frame-pressing filter slag into a hopper grid, cutting into blocks, then dropping into a plate frame-pressing slag repulping tank, adding a fixed amount of tank water, stirring and repulping;
(3) slurry primary slag pressing secondary filter pressing
Repulping the first pressing slag of the concentrated phosphoric acid slurry after plate-frame filter pressing, conveying the slurry to a secondary filter pressing plate-frame feeding by using a first pressing slag repulping pump, squeezing and back blowing by using a plate frame, loosening and discharging slag, naturally refluxing the clear liquid of the slurry after filter pressing to a plate-frame secondary-pressure acid cleaning tank for temporary storage, transferring the clear liquid to a dilute phosphoric acid tank by using a plate-frame secondary-pressure acid cleaning pump according to the liquid level of the secondary-pressure acid cleaning tank, dropping the discharged plate-frame pressing slag into a hopper grid cutting block, then dropping the cut block into a plate-frame secondary-pressure slag repulping tank, adding pool water, stirring, repulping, and conveying the slurry to a;
(4) production of ordinary superphosphate from slurry-pressed slag
The method comprises the steps of conveying slurry in a concentrated phosphoric acid slurry storage tank to a primary filter-pressing plate frame feeding pump through a plate frame slurry feeding pump, squeezing by using a plate frame, back blowing, loosening and discharging slag, naturally refluxing the filtered clear liquid of the slurry to a plate frame-pressure acid cleaning tank for temporary storage, conveying the clear liquid to a clarification tank by using a plate frame-pressure acid cleaning pump according to the liquid level of the plate frame-pressure acid cleaning tank, wherein the plate frame is designed into a detachable hopper, the repulping tank is a movable repulping tank, the partial hopper and the repulping tank are detached when the ordinary calcium market is in a busy season, and the slag is directly processed by using an automobile to transport the ordinary calcium.
2. A processing device of wet-process phosphoric acid slurry is characterized by comprising a concentrated phosphoric acid clarifying tank I (1), a concentrated phosphoric acid clarifying tank II (2); a concentrated phosphoric acid slurry storage tank (3); a plate frame I pressure acid cleaning tank (4); a plate frame II pressure acid cleaning tank (5); a plate frame I slag pressing and slurry re-sizing tank I (6) and a plate frame I slag pressing and slurry re-sizing tank II (7); a plate frame secondary slag pressing and slurry repulping tank I (8) and a plate frame secondary slag pressing and slurry repulping tank II (9); a concentrated phosphoric acid clarifying tank slurry pump I (10) and a concentrated phosphoric acid clarifying tank slurry pump II (11); a plate and frame slurry feed pump (12); a plate frame-pressure acid cleaning pump (13); a plate frame-slurry pressing pump (14); a plate frame II pressure acid cleaning pump (15); a plate frame secondary pressing slurry pump (16); primary filter pressing of a plate frame I (17) and primary filter pressing of a plate frame II (18); a secondary filter press plate frame I (19) and a secondary filter press plate frame II (20); a plate frame first slag pressing and discharging hopper I (21) and a plate frame first slag pressing and discharging hopper II (22); a plate frame secondary slag pressing and discharging hopper I (23) and a plate frame secondary slag pressing and discharging hopper II (24); the concentrated phosphoric acid clarifying tank I (1) and the concentrated phosphoric acid clarifying tank II (2) are respectively composed of a concentrated phosphoric acid clarifying tank slurry pump I (10) with a conical bottom, a concentrated phosphoric acid clarifying tank slurry pump II (11) is connected to a concentrated phosphoric acid slurry storage tank (3), and the concentrated phosphoric acid slurry storage tank (3) is provided with a stirrer;
plate frame slurry charge pump (12) are connected to first filter-pressing plate frame I (17) and first filter-pressing plate frame II (18), the first clear acid pump (13) of plate frame pressure of clear acid groove (4) is connected to the second concentrated phosphoric acid clarification tank (2) of taking the commentaries on classics harrow, first press sediment repulping tank I (6) of plate frame, first press sediment stuff pump (14) of plate frame pressure sediment repulping tank II (7) are connected to secondary filter-pressing plate frame I (19), secondary filter-pressing plate frame II (20), the second press clear acid pump (15) of plate frame pressure clear acid groove (5) are connected to rare phosphoric acid storage tank, second press sediment repulping tank I (8) of plate frame, second press sediment repulping tank II (9) of plate frame pressure stuff pump (16) are connected to and filter the gypsum repulper.
3. The processing apparatus of claim 2, wherein: the plate frame first slag pressing and reslurry tank I (6) is provided with a plate frame first slag pressing and reslurry tank stirrer I (25), the plate frame first slag pressing and reslurry tank II (7) is provided with a plate frame first slag pressing and reslurry tank stirrer II (26), the plate frame second slag pressing and reslurry tank I (8) is provided with a plate frame second slag pressing and reslurry tank stirrer I (27), and the plate frame second slag pressing and reslurry tank II (9) is provided with a plate frame second slag pressing and reslurry tank stirrer II (28).
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| CN201911312222.6A CN110921642B (en) | 2019-12-18 | 2019-12-18 | Wet-process phosphoric acid slurry treatment method and device |
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| CN201911312222.6A CN110921642B (en) | 2019-12-18 | 2019-12-18 | Wet-process phosphoric acid slurry treatment method and device |
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