CN107140616A - The method and device of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate - Google Patents
The method and device of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate Download PDFInfo
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- CN107140616A CN107140616A CN201710509626.9A CN201710509626A CN107140616A CN 107140616 A CN107140616 A CN 107140616A CN 201710509626 A CN201710509626 A CN 201710509626A CN 107140616 A CN107140616 A CN 107140616A
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- phosphoric acid
- potassium dihydrogen
- dihydrogen phosphate
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- 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
- C01B25/30—Alkali metal phosphates
- C01B25/301—Preparation from liquid orthophosphoric acid or from an acid solution or suspension of orthophosphates
- C01B25/303—Preparation from liquid orthophosphoric acid or from an acid solution or suspension of orthophosphates with elimination of impurities
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- 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
- C01B25/46—Preparation involving solvent-solvent extraction
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Abstract
The invention discloses a kind of method and device of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate, process includes：Preparing phosphoric acid by wet process；Phosphoric acid by wet process is pre-processed；Neutralize；Belt feeder is filtered；Double decomposition；Filter Press；Index is adjusted；Crystallization；Separation drying, solid feeding fluidized bed dryer is dried, and obtains finished industrial level potassium dihydrogen phosphate, and Recycling Mother Solution is used.The present invention prepares PHOSPHORIC ACID TECH.GRADE potassium dihydrogen using liquid extraction phosphoric acid substitution thermal phosphoric acid, has reached reduction production cost, has lifted the purpose of product competitiveness in the market.This technique takes Recycling Mother Solution processing to carry out deep impurity-removing matter, can be good at solving the contaminant problem in phosphoric acid by wet process, meets the production requirement of PHOSPHORIC ACID TECH.GRADE potassium dihydrogen, 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
The present invention relates to a kind of method of industrial production potassium dihydrogen phosphate, more particularly to a kind of Wet-process Phosphoric Acid Production phosphoric acid
The method and device of potassium dihydrogen.
Background technology
The manufacture method compared of current potassium dihydrogen phosphate is more, and differs from one another, and typical method has KOH（Or K2CO3）With heat
The neutralisation of method phosphoric acid, KCl and H3PO4Double decomposition of high-temperature decomposition, phosphate and sylvite etc..It is almost complete in traditional handicraft
Portion is produced using thermal phosphoric acid for raw material, since 2003, because China Power commercialization paces are accelerated and power shortages, is led
Thermal phosphoric acid rise in price is caused, many ammonium phosphate production producers are because cost is too high and has to stop production, so as to cause market goods
Source is in great shortage so that the spurt in prices of PHOSPHORIC ACID TECH.GRADE ammonium, and domestic many R＆D institutions and phosphate production producer all actively develop
Research of technique.Wet production is to use inorganic acid decomposing rock phosphate with hydrogen, isolates raw phosphoric acid, then purified rear obtained phosphoric acid product.It is wet
The method phosphoric acid method of specific heat low 20%-30% of phosphoric acid cost, and more save, Wet Processes of Phosphoric Acid is in the master of phosphoric acid production at present
Lead status.
It is using the main technique that phosphoric acid by wet process is raw material production PHOSPHORIC ACID TECH.GRADE potassium dihydrogen：Phosphoric acid by wet process desulfurization defluorinate →
Neutralization → slurry filtration → double decomposition → secondary filter → vacuum concentration → crystallisation by cooling → fluidized drying.In liquid extraction phosphoric acid
Containing cations such as a large amount of iron, aluminium, magnesium, silicon, content 3-5%, while in phosphoric acid by wet process fluorine and sulfate radical containing 1-3% etc. it is cloudy from
Son.The product that purity is 96% or 98% rank can only be produced mostly with phosphoric acid by wet process at present, and water-insoluble therein exists
O.1% or so, highest reaches 0.5%.
In addition, current domestic industry potassium dihydrogen phosphate manufacturer, filter progress uses Filter Press, same production
Can, 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, and production is continuous
Property is poor.
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 side of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate
Method and device, replace thermal phosphoric acid using liquid extraction phosphoric acid, reach reduction production cost, lift the mesh of product competitiveness in the market
's.
The purpose of the present invention is achieved through the following technical solutions：The method of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate,
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：Neutralize：Deep purifying agent is added into pretreated phosphoric acid by wet process, while being neutralized, being cured using nertralizer；
S4：Belt feeder is filtered：Obtained solidliquid mixture slurry importing belt feeder progress separation of solid and liquid, obtained phosphoric acid will be neutralized
Dihydro calcium solution enters next process；
S5：Double decomposition：Potassium sulfate solution is added into biphosphate calcium solution and carries out metathesis reaction, potassium dihydrogen phosphate material is obtained
Slurry；
S6：Filter Press：The solidliquid mixture slurry that double decomposition is obtained imports filter press and carries out secondary filter, isolated
Solid drying after obtain accessory substance calcium sulfate, isolated liquid is potassium dihydrogen phosphate clear liquid；
S7：Index is adjusted：Isolated potassium dihydrogen phosphate clear liquid is added into conditioning agent and enters row index accurate adjustment；
S8：Crystallization：Qualified potassium dihydrogen phosphate, which is adjusted, to index to concentrate, and adds crystallizer is crystallized；
S9：Separation drying：Potassium dihydrogen phosphate after crystallization is added into centrifuge and carries out separation of solid and liquid, solid feeding fluidized bed drying
Device is dried, and obtains finished industrial level potassium dihydrogen phosphate, and 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, and described nertralizer is
Milk of lime or Paris white.
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 formation mother liquor potassium dihydrogen phosphate qualified with the index regulation that step S7 is obtained after mother liquor neutralization, press filtration separation is carried out to mix
Concentrated.
Produce potassium dihydrogen phosphate device, including desulfurization pond, neutralization bucket, belt feeder, double decomposition bucket, filter press, crystallizer,
Centrifuge and fluidized bed dryer, the entrance in phosphoric acid by wet process injection desulfurization pond, the outlet in desulfurization pond passes sequentially through neutralization bucket, belt
Machine and double decomposition bucket are connected with the entrance of filter press, and accessory substance calcium sulfate, press filtration is made after the solid drying that filter press is isolated
In the clear liquid entrance for the potassium dihydrogen phosphate clear liquid injection concentration tank that machine is isolated, the outlet of concentration tank passes through crystallizer and centrifuge
Charging aperture be connected, solid that centrifuge is isolated feeding fluidized bed dryer is dried, and obtains finished industrial grade di(2-ethylhexyl)phosphate
Hydrogen potassium, the entrance of mother liquor that centrifuge is isolated injection sedimentation separation bucket, crystallization that sedimentation separation bucket is isolated and centrifuge
Charging aperture is connected, and the liquid that sedimentation separation bucket is isolated is connected with the entrance of mother liquor neutralization bucket, and the outlet of mother liquor neutralization bucket passes through
The mother liquor entrance connection 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）This technique prepares PHOSPHORIC ACID TECH.GRADE potassium dihydrogen using liquid extraction phosphoric acid substitution thermal phosphoric acid, has reached that reduction is produced into
Originally, the purpose of lifting product competitiveness in the market.
2）Filter progress replaces filter press using belt feeder, and same production capacity can reduce recruitment 90%, and greatly reduce workman
Labor intensity, after belt feeder, labor intensity is only original 10%.
3）This technique takes Recycling Mother Solution processing to carry out deep impurity-removing matter, can be good at solving the impurity in phosphoric acid by wet process
Problem, meets the production requirement of PHOSPHORIC ACID TECH.GRADE potassium dihydrogen, and makes production continuous and steady operation.So as to reach that reduction is produced into
This, lifts the effect of product competitiveness in the market.
4）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.
5）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.
6）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.
7）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 for Wet-process Phosphoric Acid Production potassium dihydrogen phosphate, 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.
S3：Neutralize：Deep purifying agent is added into pretreated phosphoric acid by wet process, while neutralized using nertralizer,
Curing；Described nertralizer is milk of lime or Paris white；
S4：Belt feeder is filtered：Obtained solidliquid mixture slurry importing belt feeder progress separation of solid and liquid, obtained phosphoric acid will be neutralized
Dihydro calcium solution enters next process；
S5：Double decomposition：Potassium sulfate solution is added into biphosphate calcium solution and carries out metathesis reaction, potassium dihydrogen phosphate material is obtained
Slurry；
S6：Filter Press：The solidliquid mixture slurry that double decomposition is obtained imports filter press and carries out secondary filter, isolated
Solid drying after obtain accessory substance calcium sulfate, isolated liquid is potassium dihydrogen phosphate clear liquid；
S7：Index is adjusted：Isolated potassium dihydrogen phosphate clear liquid is added into conditioning agent and enters row index accurate adjustment；
S8：Crystallization：Qualified potassium dihydrogen phosphate, which is adjusted, to index to concentrate, and adds crystallizer is crystallized；
S9：Separation drying：Potassium dihydrogen phosphate after crystallization is added into centrifuge and carries out separation of solid and liquid, solid feeding fluidized bed drying
Device is dried, and obtains finished industrial level potassium dihydrogen phosphate, and 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 formation mother liquor potassium dihydrogen phosphate qualified with the index regulation that step S7 is obtained after mother liquor neutralization, press filtration separation is carried out to mix
Concentrated.
As shown in figure 1, the device of production potassium dihydrogen phosphate, including clarifying tank, desulfurization pond, neutralization bucket, belt feeder, double decomposition
Bucket, filter press, crystallizer, centrifuge and fluidized bed dryer, phosphoric acid by wet process injection clarifying tank, the outlet connection desulfurization of clarifying tank
The entrance in pond, the outlet in desulfurization pond passes sequentially through neutralization bucket, belt feeder and double decomposition bucket and is connected with the entrance of filter press, filter press
Accessory substance calcium sulfate is made after the solid drying isolated, the potassium dihydrogen phosphate clear liquid that filter press is isolated injects the clear of concentration tank
In liquid entrance, the outlet of concentration tank is connected by crystallizer, dashpot with the charging aperture of centrifuge, the solid that centrifuge is isolated
Feeding fluidized bed dryer is dried, and obtains finished industrial level potassium dihydrogen phosphate, the mother liquor injection sedimentation that centrifuge is isolated
The entrance of separating barrel, the crystallization that sedimentation separation bucket is isolated is connected with the charging aperture of centrifuge, the liquid that sedimentation separation bucket is isolated
Body 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.
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 belt feeder
Frame 1 on, including filter cloth tensioning wheel 2, fixed seat 5, regulation screw mandrel 6 and be symmetricly set in the guiding of the both sides of filter cloth tensioning wheel 2
Frame 3, 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, leading truck 3 is provided with the guide chute 7 being engaged with first bearing seat 4, and fixed seat 5 is provided with to be engaged with regulation screw mandrel 6
Screwed hole, the top of regulation screw mandrel 6 is connected through the screwed hole in fixed seat 5 with first bearing seat 4, adjusts screw mandrel 6 along spiral shell
Driving first bearing seat 4 is slided up and down along guide chute 7 when pit rotates, and completes 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 potassium dihydrogen phosphate material falls on vibration cloth from loading hopper 25
First time cloth is completed on flitch 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 into completing three cloth in fluidized bed charging aperture 26
Material.
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 for Wet-process Phosphoric Acid Production potassium dihydrogen phosphate, 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：Neutralize：Deep purifying agent is added into pretreated phosphoric acid by wet process, while being neutralized, being cured using nertralizer；
S4：Belt feeder is filtered：Obtained solidliquid mixture slurry importing belt feeder progress separation of solid and liquid, obtained phosphoric acid will be neutralized
Dihydro calcium solution enters next process；
S5：Double decomposition：Potassium sulfate solution is added into biphosphate calcium solution and carries out metathesis reaction, potassium dihydrogen phosphate material is obtained
Slurry；
S6：Filter Press：The solidliquid mixture slurry that double decomposition is obtained imports filter press and carries out secondary filter, isolated
Solid drying after obtain accessory substance calcium sulfate, isolated liquid is potassium dihydrogen phosphate clear liquid；
S7：Index is adjusted：Isolated potassium dihydrogen phosphate clear liquid is added into conditioning agent and enters row index accurate adjustment；
S8：Crystallization：Qualified potassium dihydrogen phosphate, which is adjusted, to index to concentrate, and adds crystallizer is crystallized；
S9：Separation drying：Potassium dihydrogen phosphate after crystallization is added into centrifuge and carries out separation of solid and liquid, solid feeding fluidized bed drying
Device is dried, and obtains finished industrial level potassium dihydrogen phosphate, and Recycling Mother Solution is used.
2. the method for Wet-process Phosphoric Acid Production potassium dihydrogen phosphate according to claim 1, it is characterised in that：Described wet method phosphorus
It is molten in desulfurization defluorinate before processing also includes a supernatant purifying step, Precipitation phosphoric acid by wet process in low-kappa number step
Solution property impurity.
3. the method for Wet-process Phosphoric Acid Production potassium dihydrogen phosphate according to claim 1, it is characterised in that：Described depth is net
Agent is polyacrylamide, and described conditioning agent is PHOSPHORIC ACID TECH.GRADE, and described nertralizer is milk of lime or Paris white.
4. the method for Wet-process Phosphoric Acid Production potassium dihydrogen phosphate according to claim 1, it is characterised in that：Mother liquor in step S9
The step of recycling is：The mother liquor that centrifuge is separated proceeds sedimentation separation, the crystallization feeding centrifugation isolated
Machine, which carries out feeding fluidized bed dryer after secondary centrifuging, is dried, and the liquid isolated carries out mother liquor neutralization, press filtration point successively
Qualified potassium dihydrogen phosphate mixing is adjusted from rear formation mother liquor with the index that step S7 is obtained to be concentrated.
5. the device of potassium dihydrogen phosphate is produced using the method as any one of claim 1-4, it is characterised in that：Including
Desulfurization pond, neutralization bucket, belt feeder, double decomposition bucket, filter press, crystallizer, centrifuge and fluidized bed dryer, phosphoric acid by wet process injection
The entrance in desulfurization pond, the outlet in desulfurization pond passes sequentially through neutralization bucket, belt feeder and double decomposition bucket and is connected with the entrance of filter press, presses
Accessory substance calcium sulfate is made after the solid drying that filter is isolated, the potassium dihydrogen phosphate clear liquid injection concentration tank that filter press is isolated
Clear liquid entrance in, the outlet of concentration tank is connected by crystallizer with the charging aperture of centrifuge, and the solid that centrifuge is isolated is sent
Fluidized bed drier is dried, and obtains finished industrial level potassium dihydrogen phosphate, the mother liquor injection sedimentation point that centrifuge is isolated
From the entrance of bucket, the crystallization that sedimentation separation bucket is isolated is connected with the charging aperture of centrifuge, the liquid that sedimentation separation bucket is isolated
It is connected with the entrance of mother liquor neutralization bucket, the outlet of mother liquor neutralization bucket is connected by the mother liquor entrance of press filtration separator and concentration tank.
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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| CN201710509626.9A CN107140616B (en) | 2017-06-28 | 2017-06-28 | The method and device of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate |
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| CN201710509626.9A CN107140616B (en) | 2017-06-28 | 2017-06-28 | The method and device of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108117054A (en) * | 2017-12-18 | 2018-06-05 | 湖北三宁化工股份有限公司 | A kind of method for preparing potassium dihydrogen phosphate coproduction ammonium potassium dihydrogen phosphate |
| CN114920225A (en) * | 2022-06-13 | 2022-08-19 | 郑州大学 | Method for preparing columnar large-particle monopotassium phosphate by wet-process phosphoric acid chelation |
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| CN102863267A (en) * | 2012-09-08 | 2013-01-09 | 湖北三宁化工股份有限公司 | Method for producing monoammonium phosphate and coproducing N-P binary compound fertilizer by using wet-process phosphoric acid |
| CN104229764A (en) * | 2014-09-01 | 2014-12-24 | 云南云天化国际化工有限公司 | Method for continuously producing water-soluble monoammonium phosphate by using wet-process phosphoric acid |
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| CN114920225A (en) * | 2022-06-13 | 2022-08-19 | 郑州大学 | Method for preparing columnar large-particle monopotassium phosphate by wet-process phosphoric acid chelation |
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| CN107140616B (en) | 2019-01-29 |
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