CN107200315A - Method and device based on the Wet-process Phosphoric Acid Production MAP repeatedly neutralized - Google Patents
Method and device based on the Wet-process Phosphoric Acid Production MAP repeatedly neutralized Download PDFInfo
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- CN107200315A CN107200315A CN201710510568.1A CN201710510568A CN107200315A CN 107200315 A CN107200315 A CN 107200315A CN 201710510568 A CN201710510568 A CN 201710510568A CN 107200315 A CN107200315 A CN 107200315A
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- phosphoric acid
- wet
- map
- isolated
- belt feeder
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 149
- 238000000034 method Methods 0.000 title claims abstract description 85
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 45
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 10
- 239000010413 mother solution Substances 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 35
- 239000004744 fabric Substances 0.000 claims description 30
- 239000000725 suspension Substances 0.000 claims description 22
- 239000012452 mother liquor Substances 0.000 claims description 20
- 239000007787 solid Substances 0.000 claims description 20
- 230000033228 biological regulation Effects 0.000 claims description 17
- 238000006477 desulfuration reaction Methods 0.000 claims description 17
- 230000023556 desulfurization Effects 0.000 claims description 17
- 239000010985 leather Substances 0.000 claims description 17
- 238000012937 correction Methods 0.000 claims description 14
- 238000002425 crystallisation Methods 0.000 claims description 14
- 230000008025 crystallization Effects 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 13
- 238000004062 sedimentation Methods 0.000 claims description 11
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 9
- 230000001939 inductive effect Effects 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 238000011068 loading method Methods 0.000 claims description 7
- 238000001556 precipitation Methods 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 230000003472 neutralizing effect Effects 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 4
- 239000012629 purifying agent Substances 0.000 claims description 4
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000008139 complexing agent Substances 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000007115 recruitment Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000356 contaminant Substances 0.000 abstract description 2
- 235000011007 phosphoric acid Nutrition 0.000 description 56
- 239000000463 material Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000002367 phosphate rock Substances 0.000 description 3
- 239000001103 potassium chloride Substances 0.000 description 3
- 235000011164 potassium chloride Nutrition 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000002639 sodium chloride Nutrition 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000004254 Ammonium phosphate Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 125000000030 D-alanine group Chemical group [H]N([H])[C@](C([H])([H])[H])(C(=O)[*])[H] 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 241000145637 Lepturus Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 241001494479 Pecora Species 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- -1 alkali metal salt Chemical class 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 1
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 1
- 235000019289 ammonium phosphates Nutrition 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 239000006012 monoammonium phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
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
- C01B25/26—Phosphates
- C01B25/28—Ammonium phosphates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Fertilizers (AREA)
- Paper (AREA)
Abstract
The invention discloses a kind of method and device based on the Wet-process Phosphoric Acid Production MAP repeatedly neutralized, process is：Preparing phosphoric acid by wet process；Phosphoric acid by wet process is pre-processed；Once neutralize；Belt feeder filtering；It is secondary to neutralize；Secondary Filter Press；Index is adjusted；Condensing crystallizing；Separation drying.The beneficial effects of the invention are as follows：Filter progress replaces filter press using belt feeder, and same production capacity can reduce recruitment 90%, and greatly reduce labor strength, after belt feeder, and labor intensity is only original 10%.This technique takes secondary neutralisation and Recycling Mother Solution to handle and carries out deep impurity-removing matter, can be good at solving the contaminant problem in phosphoric acid by wet process, meets the production requirement of the ammonia of PHOSPHORIC ACID TECH.GRADE one, and make production continuous and steady operation.So as to reach reduction production cost, the effect of product competitiveness in the market is lifted.
Description
Technical field
It is more particularly to a kind of based on repeatedly neutralizing the present invention relates to a kind of method of Wet-process Phosphoric Acid Production MAP
The method and device of Wet-process Phosphoric Acid Production MAP.
Background technology
With the fast development of domestic and international fine phosphorus chemical industry, market is growing day by day to the demand of industrial monoammonium phosphate.Pass
Almost all is produced using thermal phosphoric acid for raw material in technique of uniting, since 2003, because China Power commercialization paces are accelerated
And power shortages, cause thermal phosphoric acid rise in price, many ammonium phosphate production producers because cost is too high and has to stop production,
So as to cause the market source of goods in great shortage so that the spurt in prices of PHOSPHORIC ACID TECH.GRADE ammonium, domestic many R＆D institutions and phosphate production
Producer all actively develops research of technique.Wet production is to use inorganic acid decomposing rock phosphate with hydrogen, isolates raw phosphoric acid, then purified rear system
Obtain phosphoric acid product.The phosphoric acid by wet process method of specific heat low 20%-30% of phosphoric acid cost, and more save, Wet Processes of Phosphoric Acid has been located at present
In the leading position of phosphoric acid production.
It is using the main technique that phosphoric acid by wet process is raw material production PHOSPHORIC ACID TECH.GRADE ammonium product：Phosphoric acid by wet process desulfurization defluorinate →
Gas ammonia neutralization → slurry filtration → vacuum concentration → crystallisation by cooling → fluidized drying.In liquid extraction phosphoric acid containing a large amount of iron, aluminium,
The cations such as magnesium, silicon, content 3-5%, while the anion such as fluorine and sulfate radical containing 1-3% in phosphoric acid by wet process.Use wet method at present
Phosphoric acid can only produce the product that purity is 96% or 98% rank mostly, and water-insoluble therein is in 0.1% or so, highest
Reach 0.5%.
In addition, at present domestic industry MAP manufacturer, filter progress use Filter Press, same production capacity,
Required supporting filter press number of units is more, and labor strength is big, and filter cloth unpicks and washes difficulty, and production auxiliary material consumption is big, continuous production
Difference.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of based on the Wet-process Phosphoric Acid Production repeatedly neutralized
The method and device of MAP, filter progress uses belt feeder, and same production capacity reduces recruitment 90%, greatly reduces workman's work
Intensity；Take secondary neutralisation and Recycling Mother Solution to handle and carry out deep impurity-removing matter work, the impurity that can be solved in phosphoric acid by wet process is asked
Topic, meets the requirement of the production ammonia of PHOSPHORIC ACID TECH.GRADE one, and production being capable of continuous and steady operation.
The purpose of the present invention is achieved through the following technical solutions：Based on the Wet-process Phosphoric Acid Production phosphoric acid repeatedly neutralized
The method of one ammonium, comprises the following steps：
S1：Preparing phosphoric acid by wet process：Phosphoric acid by wet process is made with sulfuric acid decomposition phosphorus ore；
S2：Phosphoric acid by wet process is pre-processed：Engaging sulphate and defluorinate processing are carried out to phosphoric acid by wet process, complexing agent is then added to wet method phosphorus
Cation impurity in acid is handled；
S3：Once neutralize：Into pretreated phosphoric acid by wet process add deep purifying agent, while neutralized using gas ammonia, it is ripe
Change；
S4：Belt feeder filtering：Obtained solidliquid mixture slurry importing belt feeder progress separation of solid and liquid, liquid will once be neutralized
Body enters next process；
S5：It is secondary to neutralize：Secondary neutralize is carried out to the liquid being once filtrated to get using gas ammonia；
S6：Secondary Filter Press：By the secondary solidliquid mixture slurry importing filter press progress secondary filter for neutralizing and obtaining, point
From being made after obtained solid drying, accessory substance is fertile in vain, and isolated liquid is MAP clear liquid；
S7：Index is adjusted：Isolated MAP clear liquid is added into conditioning agent and enters row index accurate adjustment；
S8：Crystallization：Qualified MAP solution, which is adjusted, to index to concentrate, and adds crystallizer is crystallized；
S9：Separation drying：MAP after crystallization is added into centrifuge and carries out separation of solid and liquid, solid feeding fluidized bed dryer
Dried, obtain finished industrial level MAP, Recycling Mother Solution is used.
In described phosphoric acid by wet process pre-treatment step, also include a supernatant purifying step in desulfurization defluorinate before processing, sink
The dissolubility impurity that precipitation goes out in phosphoric acid by wet process.
Described deep purifying agent is polyacrylamide, and described conditioning agent is PHOSPHORIC ACID TECH.GRADE.
The step of Recycling Mother Solution is used in step S9 be：The mother liquor that centrifuge is separated proceeds sedimentation separation,
The crystallization feeding centrifuge isolated, which carries out feeding fluidized bed dryer after secondary centrifuging, is dried, and the liquid isolated is successively
The index that formation mother liquor and step S7 are obtained after the neutralization of progress mother liquor, press filtration separation adjusts qualified MAP solution and is mixed into
Row concentration.
Produce the device of MAP, including desulfurization pond, neutralization bucket, belt feeder, secondary neutralization bucket, filter press, a knot
Brilliant device, centrifuge and fluidized bed dryer, the entrance in phosphoric acid by wet process injection desulfurization pond, during the outlet in desulfurization pond is passed sequentially through once
It is connected with bucket, belt feeder and secondary neutralization bucket with the entrance of filter press, accessory substance is made after the solid drying that filter press is isolated
In white fertilizer, the clear liquid entrance for the MAP clear liquid injection concentration tank that filter press is isolated, the outlet of concentration tank passes through crystallizer
It is connected with the charging aperture of centrifuge, the solid feeding fluidized bed dryer that centrifuge is isolated is dried, and obtains finished industrial
Level MAP, the entrance of mother liquor that centrifuge is isolated injection sedimentation separation bucket, the crystallization that sedimentation separation bucket is isolated with from
The charging aperture of scheming is connected, the liquid that sedimentation separation bucket is isolated is connected with the entrance of mother liquor neutralization bucket, and mother liquor neutralization bucket goes out
Mouth is connected by the mother liquor entrance of press filtration separator and concentration tank.
Described belt feeder includes filter cloth rate of tension adjusting means, and filter cloth rate of tension adjusting means is arranged on the frame of belt feeder
On, including filter cloth tensioning wheel, fixed seat, the leading truck that adjusts screw mandrel and be symmetricly set in filter cloth tensioning wheel both sides, leading truck and
Fixed seat is fixedly mounted in frame, and the two ends of filter cloth tensioning wheel are connected to first bearing seat, leading truck be provided with
The guide chute that first bearing seat is engaged, fixed seat is provided with the screwed hole being engaged with regulation screw mandrel, adjusts the top of screw mandrel
Portion is connected through the screwed hole in fixed seat with first bearing seat, and regulation screw mandrel drives first bearing seat edge when threadingly hole rotates
Guide chute is slided up and down, and completes the rate of tension regulation of filter cloth.
Described belt feeder includes belt tightening adjusting means, and belt tightening adjusting means includes leather belt roller and symmetrical
Pedestal located at leather belt roller both sides, the two ends of leather belt roller are arranged on pedestal by second bearing seat respectively, described pedestal bag
Work shape support and floor stringer are included, work shape support is made up of the first vertical rod, the second vertical rod and crossbeam, floor stringer is mutually put down with crossbeam
OK, bar shaped sliding block is equipped with the inside of floor stringer and crossbeam, the both sides of the second bearing seat are provided with to be engaged with bar shaped sliding block
Chute；
Also include tensing screw mandrel, the first vertical rod is provided with and tenses the screwed hole that screw mandrel is engaged, and the top for tensing screw mandrel is passed through
Screwed hole in first vertical rod is connected with second bearing seat, tenses screw mandrel and second bearing seat is driven when threadingly hole rotates in auxiliary
It is traversing along bar shaped sliding block direction between beam and crossbeam, complete the rate of tension regulation of belt.
Described belt feeder includes Pneumatic type leather belt and offsets apparatus for correcting, and Pneumatic type leather belt skew apparatus for correcting includes correction
Roll shaft and corrective component, corrective component are gentle including stroke inductive switch, the microcontroller that at least one is located at belt side
Dynamic adjusting part, stroke inductive switch is connected with the sampled signal input of microcontroller, the enable letter of microcontroller
Number output end is connected with pneumatic adjusting part；The not moved end of correction roll shaft is hinged on frame I, and the moved end of correction roll shaft passes through gas
Dynamic adjusting part is arranged on frame II；
Described pneumatic adjusting part includes the first air bag group and the second air bag group, and the first air bag group and the second air bag group are set respectively
Be placed in the both sides of correction roll shaft moved end, the inflation/deflation drive circuit of the first air bag group and the second air bag group respectively with microcontroller
MCU enable signal output part is connected.
Described fluidized bed dryer includes vibrating feed device, and vibrating feed device includes loading hopper, fluid bed and entered
Material mouth and the vibration drapery panel being obliquely installed, the discharging opening of loading hopper are arranged above the high order end of vibration drapery panel, vibration
The low order end of drapery panel is arranged above fluid bed charging aperture, is provided with oscillation drive on described vibration drapery panel, institute
The two ends for stating vibration drapery panel are arranged with resonant component, and every group of resonant component includes suspension rod and spring, and the top of suspension rod is fixed
In reference seat, movable cushion block is socketed with suspension rod, the bottom of suspension rod is provided with fixed cushion block, one end and the activity of spring
Cushion block is fixedly connected, and the other end of spring is connected with fixed cushion block, and vibration drapery panel is fixedly connected with movable cushion block.
It is installed with U-shaped frame, the transverse slat and movable cushion block of U-shaped frame and is equipped with the side wall of described vibration drapery panel
The through hole being engaged with suspension rod, suspension rod sequentially passes through U-shaped frame transverse slat, movable cushion block and spring and is connected with fixed cushion block, activity mat
The upper top surface of block is fixedly connected with U-shaped frame transverse slat.
The beneficial effects of the invention are as follows：
1）Filter progress replaces filter press using belt feeder, and same production capacity can reduce recruitment 90%, and greatly reduction workman work
Intensity, after belt feeder, labor intensity is only original 10%.
2）This technique takes secondary neutralisation and Recycling Mother Solution to handle and carries out deep impurity-removing matter, can be good at solving wet method
Contaminant problem in phosphoric acid, meets the production requirement of the ammonia of PHOSPHORIC ACID TECH.GRADE one, improves output capacity（85-90%）, and make production continuous
Stable operation.So as to reach reduction production cost, the effect of product competitiveness in the market is lifted.
3）When Wet-process Phosphoric Acid Production comes out in addition to containing solid impurity, many of which dissolubility impurity is under storage requirement
In hypersaturated state, thus have precipitation slowly separate out.Supernatant purification is carried out in desulfurization defluorinate before processing, can be with Precipitation
Dissolubility impurity in phosphoric acid by wet process, being capable of further purification of wet process phosphoric acid.
4）The slip of tension wheel shaft bearing is driven in filter cloth and belt tightening adjusting means using screw mandrel, improves and opens
Tightness adjusts the degree of accuracy of process, by the regulation of screw mandrel, makes the movement of bearing block more directly perceived, is easy to operating personnel to carry out micro-
Adjust.
5）The deviation angle of correction roll shaft is fine-tuned by correcting the inflation/deflation of air bag, so that it is inclined to drive belt to complete
Correction is moved, the automatic detection of belt skew is realized and from correcting, intelligent, automaticity is high.
6）Vibration drapery panel is additionally arranged between loading hopper and fluid bed charging aperture, realize material further cloth and
Crush, powerful guarantee is provided for fluidized bed drying effect；Resonant component is simple in construction, ingenious in design, and vibration is steady, operation
When without critical noisy.Fixed cushion block can be arranged on suspension rod using adjustable mode, by the position-adjustable for adjusting fixed cushion block
Drapery panel height, reaches the purpose of regulation cloth height.
Brief description of the drawings
Fig. 1 is present invention process method flow diagram；
Fig. 2 is filter cloth rate of tension adjusting means structural representation one of the present invention；
Fig. 3 is filter cloth rate of tension adjusting means structural representation two of the present invention；
Fig. 4 is inventive belt rate of tension adjusting means structural representation；
Fig. 5 is the bearing block structure schematic diagram in inventive belt rate of tension adjusting means；
Fig. 6 is that Pneumatic type leather belt of the present invention offsets apparatus for correcting structural representation；
Fig. 7 is vibrating feed device structural representation of the present invention；
Fig. 8 is the resonant component structural representation in vibrating feed device of the present invention.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
As shown in figure 1, the method based on the Wet-process Phosphoric Acid Production MAP repeatedly neutralized, comprises the following steps：
S1：Preparing phosphoric acid by wet process：Phosphoric acid by wet process is made with sulfuric acid decomposition phosphorus ore；
S2：Phosphoric acid by wet process is pre-processed：Engaging sulphate and defluorinate processing are carried out to phosphoric acid by wet process, complexing agent is then added to wet method phosphorus
Cation impurity in acid is handled；
In described phosphoric acid by wet process pre-treatment step, also include a supernatant purifying step, precipitation analysis in desulfurization defluorinate before processing
The dissolubility impurity gone out in phosphoric acid by wet process.When Wet-process Phosphoric Acid Production comes out in addition to containing solid impurity, many of which dissolubility
Impurity under storage requirement be in hypersaturated state, therefore have precipitation slowly separate out.Supernatant is carried out in desulfurization defluorinate before processing
Purification, can be with the dissolubility impurity in Precipitation phosphoric acid by wet process, being capable of further purification of wet process phosphoric acid.
The operation of engaging sulphate is：Ground phosphate rock is added in phosphoric acid by wet process, by Ca2+With SO4 2-The amount ratio of material is about（1.20-
1.50）：1,1-2h progress desulfurization is reacted in 50-80 DEG C of water-bath.It is comprehensive although slightly lower to sulfate radical clearance with phosphorus ore
Cost is lower than calcium hydroxide, therefore selection ground phosphate rock.
The operation of defluorinate is：Desulfurization phosphoric acid is taken, sodium carbonate is added, by Na+With F-The amount ratio of material is（1.00-1.30）：1,
In 40-60 DEG C of water-bath react 1-2h carry out defluorinate, after be aged 1-2h again.Phosphoric acid by wet process alkali metal salt defluorinating agent, it is main at present
There are sodium chloride, sodium sulphate, sodium carbonate, potassium chloride, potassium sulfate etc. several.The defluorinate of sodium salt and sylvite is can be with using them
Fluorine in phosphoric acid by wet process forms the low fluosilicate of solubility, fluorine is deposited from phosphoric acid solution and separates.Compared with sylvite,
Sodium salt is cheap and easily-available, it is possible to decrease defluorinate cost, it is also contemplated that MAP crystallization below can be influenceed by introducing element, finally selectes carbon
Sour sodium is defluorinating agent.
S3：Once neutralize：Add polyacrylamide into pretreated phosphoric acid by wet process, molecular formula (C3H5NO) n, simultaneously
Neutralized, cured using gas ammonia；
S4：Belt feeder filtering：Obtained solidliquid mixture slurry importing belt feeder progress separation of solid and liquid, liquid will once be neutralized
Body enters next process；
S5：It is secondary to neutralize：Secondary neutralize is carried out to the liquid being once filtrated to get using gas ammonia；
S6：Secondary Filter Press：By the secondary solidliquid mixture slurry importing filter press progress secondary filter for neutralizing and obtaining, point
From being made after obtained solid drying, accessory substance is fertile in vain, and isolated liquid is MAP clear liquid；
S7：Index is adjusted：Isolated MAP clear liquid is added into PHOSPHORIC ACID TECH.GRADE, molecular formula H3PO4 enters row index essence
Adjust；
S8：Crystallization：Qualified MAP solution, which is adjusted, to index to concentrate, and adds crystallizer is crystallized；
S9：Separation drying：MAP after crystallization is added into centrifuge and carries out separation of solid and liquid, solid feeding fluidized bed dryer
Dried, obtain finished industrial level MAP, Recycling Mother Solution is used.
The step of Recycling Mother Solution is used in step S9 be：The mother liquor that centrifuge is separated proceeds sedimentation separation,
The crystallization feeding centrifuge isolated, which carries out feeding fluidized bed dryer after secondary centrifuging, is dried, and the liquid isolated is successively
The index that formation mother liquor and step S7 are obtained after the neutralization of progress mother liquor, press filtration separation adjusts qualified MAP solution and is mixed into
Row concentration.
As shown in figure 1, the device of production MAP, including it is clarifying tank, desulfurization pond, neutralization bucket, belt feeder, secondary
Neutralization bucket, filter press, crystallizer, centrifuge and fluidized bed dryer, phosphoric acid by wet process injection clarifying tank, clarifying tank and desulfurization pond
Entrance is connected, and the outlet in desulfurization pond passes sequentially through neutralization bucket, belt feeder and secondary neutralization bucket and is connected with the entrance of filter press,
The MAP clear liquid injection concentration tank that accessory substance is fertile in vain, and filter press is isolated is made after the solid drying that filter press is isolated
In clear liquid entrance, the outlet of concentration tank is connected by crystallizer with the charging aperture of centrifuge, the solid feeding that centrifuge is isolated
Fluidized bed dryer is dried, and obtains finished industrial level MAP, the mother liquor injection sedimentation separation bucket that centrifuge is isolated
Entrance, the crystallization isolated of sedimentation separation bucket is connected with the charging aperture of centrifuge, the liquid that sedimentation separation bucket is isolated and mother
The entrance of liquid neutralization bucket is connected, and the outlet of mother liquor neutralization bucket is connected by the mother liquor entrance of press filtration separator and concentration tank.
As shown in Fig. 2 belt feeder includes filter cloth rate of tension adjusting means, filter cloth rate of tension adjusting means is arranged on the machine of belt feeder
On frame 1, including filter cloth tensioning wheel 2, fixed seat 5, regulation screw mandrel 6 and the leading truck 3 for being symmetricly set in the both sides of filter cloth tensioning wheel 2,
Leading truck 3 and fixed seat 5 are fixedly mounted in frame 1, and the two ends of filter cloth tensioning wheel 2 are connected to first bearing seat 4, lead
The guide chute 7 being engaged with first bearing seat 4 is provided with to frame 3, fixed seat 5 is provided with the spiral shell being engaged with regulation screw mandrel 6
Pit, the top of regulation screw mandrel 6 is connected through the screwed hole in fixed seat 5 with first bearing seat 4, adjusts the threadingly hole of screw mandrel 6
Drive first bearing seat 4 to be slided up and down along guide chute 7 during rotation, complete the rate of tension regulation of filter cloth.
As a further improvement, as shown in figure 3, be additionally provided with positioning hole 3.1 on the side wing of leading truck 3, coordinating positioning hole
3.1 use alignment pin 3.2, are adjusted in filter cloth tensioning wheel 2 to after appropriate location（Rate of tension is moderate）, it is fixed that alignment pin 3.2 is passed through
Position hole 3.1 is simultaneously pressed in first bearing seat 4, can reach the purpose of further fixed filter cloth tensioning wheel 2.
As shown in figure 4, belt feeder includes belt tightening adjusting means, belt tightening adjusting means includes leather belt roller 8
With the pedestal for being symmetrically set in the both sides of leather belt roller 8, the two ends of leather belt roller 8 are arranged on pedestal by second bearing seat 13 respectively, institute
The pedestal stated includes work shape support and floor stringer 9, and work shape support is made up of the first vertical rod 10, the second vertical rod 11 and crossbeam 12, auxiliary
Beam 9 is helped to be parallel to each other with crossbeam 12, the inner side of floor stringer 9 and crossbeam 12 is equipped with bar shaped sliding block 14, the second bearing seat 13
Both sides be provided with the chute 15 that is engaged with bar shaped sliding block 14（As shown in Figure 5）；Also include tensing in screw mandrel 16, the first vertical rod 10
Provided with tensing the screwed hole that screw mandrel 16 is engaged, the top of tension screw mandrel 16 passes through the screwed hole and second in the first vertical rod 3
Bearing block 13 is connected, and tenses screw mandrel 16 and drives the edge between floor stringer 9 and crossbeam 12 of second bearing seat 13 when threadingly hole rotates
The direction of bar shaped sliding block 14 is traversing, completes the rate of tension regulation of belt.
As shown in fig. 6, belt feeder, which includes Pneumatic type leather belt, offsets apparatus for correcting, Pneumatic type leather belt skew apparatus for correcting includes
Roll shaft 18 and corrective component are corrected, corrective component includes two stroke inductive switch 19, the microcontrollers for being located at the both sides of belt 17
MCU20 and pneumatic adjusting part, stroke inductive switch 19 are connected with the sampled signal input of microcontroller 20, microcontroller
Device MCU20 enable signal output part is connected with pneumatic adjusting part；The not moved end of correction roll shaft 18 is hinged on frame I24,
The moved end for correcting roll shaft 18 is arranged on frame II21 by pneumatic adjusting part；Described pneumatic adjusting part includes the first gas
The air bag group 23 of capsule group 22 and second, the first air bag group 22 and the second air bag group 23 are respectively arranged at the two of correction roll shaft 18 moved end
Enable signal of the inflation/deflation drive circuit of side, the first air bag group 22 and the second air bag group 23 respectively with microcontroller 20 is defeated
Go out end to be connected.
The course of work of Pneumatic type leather belt skew apparatus for correcting is as follows：When the angle of belt 17 shifts, first by setting
Stroke inductive switch 19 in the both sides of belt 17 senses the information of the skew, and stroke inductive switch 19 transmits a signal to micro-control
Device MCU20 processed, and by the Treatment Analysis output control signal of microcontroller 20 to positioned at the first of correction roll shaft 18 moved end both sides
The air bag group 23 of air bag group 22 and second, promotes correction roll shaft 18 to enclose by the inflation/deflation of the first air bag group 22 and the second air bag group 23
Do not occur thin tail sheep rotation in moved end around it, so as to realize the adjustment of the correction angle of roll shaft 18.
As shown in fig. 7, described fluidized bed dryer includes vibrating feed device, vibrating feed device includes loading hopper
25th, fluid bed charging aperture 26 and the vibration drapery panel 27 being obliquely installed, the discharging opening of loading hopper 25 are arranged at vibration drapery panel
Above 27 high order end, the low order end of vibration drapery panel 27 is arranged at the top of fluid bed charging aperture 26, described vibration drapery panel
Oscillation drive is installed, oscillation drive is specially eccentric motor 33, and eccentric motor 33 passes through clevis mounting 34 on 27
On the bottom plate for being fixedly mounted on vibration drapery panel 27.The protective plate 35 increased is additionally provided with the side wall of the vibration drapery panel 27.
The two ends of the vibration drapery panel 27 are arranged with resonant component, and every group of resonant component includes suspension rod 28 and spring 29, suspension rod 28
Top be fixedly mounted in reference seat 30, movable cushion block 31 is socketed with suspension rod 28, the bottom of suspension rod 28 is provided with fixed pad
Block 32, one end of spring 29 is fixedly connected with movable cushion block 31, and the other end of spring 29 is connected with fixed cushion block 32, vibrates cloth
Plate 27 is fixedly connected with movable cushion block 31.
Specifically, as shown in figure 8, being installed with U-shaped frame 37, U-shaped frame 37 on the side wall of described vibration drapery panel 27
Transverse slat and movable cushion block 31 on be equipped with the through hole being engaged with suspension rod 28, suspension rod 28 sequentially passes through the transverse slat of U-shaped frame 37, activity
Cushion block 31 and spring 29 are connected with fixed cushion block 32, and the upper top surface of movable cushion block 31 is fixedly connected with the transverse slat of U-shaped frame 37.
As shown in figure 8, the top of suspension rod 28 is fixedly mounted in reference seat 30 by L-shaped connecting rod 36, it is socketed on suspension rod 28
There is movable cushion block 31, the described center of fixation cushion block 32 is provided with the through hole being engaged with suspension rod 28, the bottom surface of fixed cushion block 32
Adjusting nut 38 is fixed with, the bottom of suspension rod 28 is the screw rod coordinated with adjusting nut 38.By the position for adjusting fixed cushion block 32
The height of adjustable vibration drapery panel 27 is put, the purpose of regulation cloth height is reached.
The operation principle of vibrating feed device is as follows：Powdered MAP material falls on vibration cloth from loading hopper 25
First time cloth is completed on plate 27, the work of eccentric motor 33 drives whole vibration drapery panel 27 to produce extensional vibration and completes material
Secondary material distributing, material gradually slides from inclined vibration drapery panel 27 and three clothes is completed into fluidized bed charging aperture 26.
Described above is only the preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form, is not to be taken as the exclusion to other embodiment, and available for various other combinations, modification and environment, and can be at this
In the text contemplated scope, it is modified by the technology or knowledge of above-mentioned teaching or association area.And those skilled in the art are entered
Capable change and change does not depart from the spirit and scope of the present invention, then all should appended claims of the present invention protection domain
It is interior.
Claims (10)
1. the method based on the Wet-process Phosphoric Acid Production MAP repeatedly neutralized, it is characterised in that comprise the following steps：
S1：Preparing phosphoric acid by wet process：Phosphoric acid by wet process is made with sulfuric acid decomposition phosphorus ore；
S2：Phosphoric acid by wet process is pre-processed：Engaging sulphate and defluorinate processing are carried out to phosphoric acid by wet process, complexing agent is then added to wet method phosphorus
Cation impurity in acid is handled；
S3：Once neutralize：Into pretreated phosphoric acid by wet process add deep purifying agent, while neutralized using gas ammonia, it is ripe
Change；
S4：Belt feeder filtering：Obtained solidliquid mixture slurry importing belt feeder progress separation of solid and liquid, liquid will once be neutralized
Body enters next process；
S5：It is secondary to neutralize：Secondary neutralize is carried out to the liquid being once filtrated to get using gas ammonia；
S6：Secondary Filter Press：By the secondary solidliquid mixture slurry importing filter press progress secondary filter for neutralizing and obtaining, point
From being made after obtained solid drying, accessory substance is fertile in vain, and isolated liquid is MAP clear liquid；
S7：Index is adjusted：Isolated MAP clear liquid is added into conditioning agent and enters row index accurate adjustment；
S8：Crystallization：Qualified MAP solution, which is adjusted, to index to concentrate, and adds crystallizer is crystallized；
S9：Separation drying：MAP after crystallization is added into centrifuge and carries out separation of solid and liquid, solid feeding fluidized bed dryer
Dried, obtain finished industrial level MAP, Recycling Mother Solution is used.
2. the method according to claim 1 based on the Wet-process Phosphoric Acid Production MAP repeatedly neutralized, it is characterised in that：
In described phosphoric acid by wet process pre-treatment step, also include a supernatant purifying step in desulfurization defluorinate before processing, Precipitation is wet
Dissolubility impurity in method phosphoric acid.
3. the method according to claim 1 based on the Wet-process Phosphoric Acid Production MAP repeatedly neutralized, it is characterised in that：
Described deep purifying agent is polyacrylamide, and described conditioning agent is PHOSPHORIC ACID TECH.GRADE.
4. the method according to claim 1 based on the Wet-process Phosphoric Acid Production MAP repeatedly neutralized, it is characterised in that：
The step of Recycling Mother Solution is used in step S9 be：The mother liquor that centrifuge is separated proceeds sedimentation separation, isolates
Crystallization feeding centrifuge, which carries out feeding fluidized bed dryer after secondary centrifuging, is dried, and the liquid isolated carries out mother liquor successively
Neutralize, the index that press filtration forms mother liquor after separating with step S7 is obtained adjusts qualified MAP solution mixing and concentrated.
5. the method according to any one of claim 1-4 produces the device of MAP, it is characterised in that：Including desulfurization
Pond, neutralization bucket, belt feeder, secondary neutralization bucket, filter press, crystallizer, centrifuge and fluidized bed dryer, phosphoric acid by wet process note
Enter the entrance in desulfurization pond, the outlet in desulfurization pond passes sequentially through entering for neutralization bucket, belt feeder and secondary neutralization bucket and filter press
Mouth is connected, and obtained accessory substance is fertile in vain after the solid drying that filter press is isolated, the MAP clear liquid injection that filter press is isolated
In the clear liquid entrance of concentration tank, the outlet of concentration tank is connected by crystallizer with the charging aperture of centrifuge, what centrifuge was isolated
Solid feeding fluidized bed dryer is dried, and obtains finished industrial level MAP, and the mother liquor injection that centrifuge is isolated is heavy
The entrance of separating barrel drops, and the crystallization that sedimentation separation bucket is isolated is connected with the charging aperture of centrifuge, and sedimentation separation bucket is isolated
Liquid is connected with the entrance of mother liquor neutralization bucket, and the outlet of mother liquor neutralization bucket is connected by the mother liquor entrance of press filtration separator and concentration tank
Connect.
6. device according to claim 5, it is characterised in that：Described belt feeder includes filter cloth rate of tension adjusting means,
Filter cloth rate of tension adjusting means is arranged on the frame of belt feeder（1）On, including filter cloth tensioning wheel（2）, fixed seat（5）, regulation silk
Bar（6）Be symmetricly set in filter cloth tensioning wheel（2）The leading truck of both sides（3）, leading truck（3）And fixed seat（5）It is fixedly mounted
In frame（1）On, filter cloth tensioning wheel（2）Two ends be connected to first bearing seat（4）, leading truck（3）It is provided with and first
Bearing block（4）The guide chute being engaged（7）, fixed seat（5）It is provided with and regulation screw mandrel（6）The screwed hole being engaged, regulation
Screw mandrel（6）Top pass through fixed seat（5）On screwed hole and first bearing seat（4）It is connected, adjusts screw mandrel（6）Threadingly Kong Xuan
First bearing seat is driven when turning（4）Along guide chute（7）Slide up and down, complete the rate of tension regulation of filter cloth.
7. device according to claim 5, it is characterised in that：Described belt feeder includes belt tightening adjusting means,
Belt tightening adjusting means includes leather belt roller（8）Be symmetrically set in leather belt roller（8）The pedestal of both sides, leather belt roller（8）Two ends
Pass through second bearing seat respectively（13）On pedestal, described pedestal includes work shape support and floor stringer（9）, work shape support
By the first vertical rod（10）, the second vertical rod（11）And crossbeam（12）Constitute, floor stringer（9）With crossbeam（12）It is parallel to each other, floor stringer
（9）With crossbeam（12）Inner side be equipped with bar shaped sliding block（14）, the second bearing seat（13）Both sides be provided with and bar shaped sliding block
（14）The chute being engaged（15）；
Also include tensing screw mandrel（16）, the first vertical rod（10）It is provided with tensing screw mandrel（16）The screwed hole being engaged, tenses silk
Bar（16）Top pass through the first vertical rod（3）On screwed hole and second bearing seat（13）It is connected, tenses screw mandrel（16）Threadingly
Hole drives second bearing seat when rotating（13）In floor stringer（9）With crossbeam（12）Between along bar shaped sliding block（14）Direction is traversing, complete
The rate of tension regulation of cutification band.
8. device according to claim 5, it is characterised in that：Described belt feeder includes Pneumatic type leather belt skew correction dress
Put, Pneumatic type leather belt skew apparatus for correcting includes correction roll shaft（18）And corrective component, corrective component is located at including at least one
Belt（17）The stroke inductive switch of side（19）, microcontroller（20）With pneumatic adjusting part, stroke inductive switch（19）
With microcontroller（20）Sampled signal input be connected, microcontroller（20）Enable signal output part and pneumatic tune
Component is saved to be connected；Correct roll shaft（18）Not moved end be hinged on frame I（24）On, correct roll shaft（18）Moved end pass through pneumatic tune
Save component and be arranged on frame II（21）On；
Described pneumatic adjusting part includes the first air bag group（22）With the second air bag group（23）, the first air bag group（22）With second
Air bag group（23）It is respectively arranged at correction roll shaft（18）The both sides of moved end, the first air bag group（22）With the second air bag group（23）Fill
Deflation drive circuit respectively with microcontroller（20）Enable signal output part be connected.
9. device according to claim 5, it is characterised in that：Described fluidized bed dryer includes vibrating feed device,
Vibrating feed device includes loading hopper（25）, fluid bed charging aperture（26）With the vibration drapery panel being obliquely installed（27）, charging
Funnel（25）Discharging opening be arranged at vibration drapery panel（27）High order end above, vibrate drapery panel（27）Low order end be arranged at
Fluid bed charging aperture（26）Top, described vibration drapery panel（27）On oscillation drive, the vibration drapery panel are installed
（27）Two ends be arranged with resonant component, every group of resonant component includes suspension rod（28）And spring（29）, suspension rod（28）Top
It is fixedly mounted on reference seat（30）On, suspension rod（28）On be socketed with movable cushion block（31）, suspension rod（28）Bottom fixation is installed
Cushion block（32）, spring（29）One end and movable cushion block（31）It is fixedly connected, spring（29）The other end and fixed cushion block（32）
Connection, vibrates drapery panel（27）With movable cushion block（31）It is fixedly connected.
10. device according to claim 9, it is characterised in that：Described vibration drapery panel（27）Side wall on fixed peace
Equipped with U-shaped frame（37）, U-shaped frame（37）Transverse slat and movable cushion block（31）On be equipped with and suspension rod（28）The through hole being engaged, hangs
Bar（28）Sequentially pass through U-shaped frame（37）Transverse slat, movable cushion block（31）And spring（29）With fixed cushion block（32）Connection, movable cushion block
（31）Upper top surface and U-shaped frame（37）Transverse slat is fixedly connected.
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| CN201710510568.1A CN107200315B (en) | 2017-06-28 | 2017-06-28 | Method and device for producing monoammonium phosphate based on multi-neutralization wet-process phosphoric acid |
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|---|---|---|---|
| CN201710510568.1A CN107200315B (en) | 2017-06-28 | 2017-06-28 | Method and device for producing monoammonium phosphate based on multi-neutralization wet-process phosphoric acid |
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| CN109574735A (en) * | 2018-12-20 | 2019-04-05 | 四川大学 | The processing and MAP coproduction of phosphorus ammonium mother liquor are containing the technique of middle microelement APP |
| CN110577202A (en) * | 2019-09-27 | 2019-12-17 | 瓮福达州化工有限责任公司 | battery-grade phosphate preparation system and preparation process thereof |
| CN110681487A (en) * | 2019-09-27 | 2020-01-14 | 瓮福达州化工有限责任公司 | Iron removing system and preparation process thereof |
| CN117963860A (en) * | 2023-12-30 | 2024-05-03 | 湖北天宜磷氟科技研究有限公司 | A method for preparing battery-grade monoammonium phosphate clear solution using powdered monoammonium phosphate |
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