CN221183161U - Flotation separation device for producing potassium nitrate by ammonium nitrate double decomposition method - Google Patents
Flotation separation device for producing potassium nitrate by ammonium nitrate double decomposition method Download PDFInfo
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- CN221183161U CN221183161U CN202323012396.5U CN202323012396U CN221183161U CN 221183161 U CN221183161 U CN 221183161U CN 202323012396 U CN202323012396 U CN 202323012396U CN 221183161 U CN221183161 U CN 221183161U
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- flotation
- mother liquor
- filter
- potassium nitrate
- centrifuge
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- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 238000005188 flotation Methods 0.000 title claims abstract description 89
- 235000010333 potassium nitrate Nutrition 0.000 title claims abstract description 75
- 239000004323 potassium nitrate Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000000926 separation method Methods 0.000 title claims abstract description 25
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 21
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 title claims abstract description 19
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000012452 mother liquor Substances 0.000 claims abstract description 67
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 47
- 239000013078 crystal Substances 0.000 claims abstract description 37
- 239000002562 thickening agent Substances 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 32
- 238000003756 stirring Methods 0.000 claims description 25
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- 238000005406 washing Methods 0.000 abstract description 23
- 238000002425 crystallisation Methods 0.000 abstract description 11
- 230000008025 crystallization Effects 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000007670 refining Methods 0.000 abstract description 8
- 238000004090 dissolution Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 10
- 230000018044 dehydration Effects 0.000 description 8
- 238000006297 dehydration reaction Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000008719 thickening Effects 0.000 description 5
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012043 crude product Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- XYMGITWDJOFQCD-UHFFFAOYSA-N [Cl-].[NH4+].[N+](=O)([O-])[O-].[K+] Chemical compound [Cl-].[NH4+].[N+](=O)([O-])[O-].[K+] XYMGITWDJOFQCD-UHFFFAOYSA-N 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The utility model relates to the field of chemical separation engineering, and provides a flotation separation device for producing potassium nitrate by an ammonium nitrate double-decomposition method, which is characterized by comprising a flotation system, wherein the flotation system comprises a flotation thickener, a filter tank, a circulating flotation pump, a centrifuge and a spiral elevator; the utility model discloses a flotation thickener, including the flotation thickener, the spiral elevator, the communicating tube is installed to spiral elevator top one side, the communicating tube is used for mother liquor and tiny crystal backward flow to flotation thickener inside, the spiral elevator has seted up the discharge port in one side of keeping away from the communicating tube to make the material that leaves the discharge port directly get into inside the centrifuge. When the method is used, the high-efficiency separation of two crystals of potassium nitrate and ammonium chloride is realized, the washing water quantity during the refining of the potassium nitrate primary product is greatly reduced, the content reaching more than 98 percent after one-time crystallization washing separation can be ensured, and the reliable guarantee is provided for reaching high-quality potassium nitrate after the heavy dissolution refining.
Description
Technical Field
The utility model relates to the field of chemical separation engineering, in particular to a flotation separation device for producing potassium nitrate by an ammonium nitrate double decomposition method.
Background
The main processes for producing potassium nitrate in China are ammonium nitrate double decomposition process and magnesium nitrate double decomposition process, wherein the two processes account for more than 95% of the total national yield, and the potassium nitrate produced by the ammonium nitrate double decomposition production process accounts for more than 50% of the total national yield.
In the last 10 years, compared with the magnesium nitrate oxide double decomposition process under the prior art, the ammonium nitrate double decomposition production process has the advantages of large evaporation capacity, complex process, poor control of product quality, and the main reason is that ammonium chloride crystals are simultaneously separated out when the potassium nitrate is produced for the first time in a coarse crystallization mode, the crystallization amount of the ammonium chloride accounts for 17-20% of the total crystallization material amount, and a lot of mixed crystals of the potassium nitrate and the ammonium chloride are formed together.
In the prior art, ammonium nitrate double decomposition can separate out and form a large amount of mixed crystal materials of potassium nitrate and ammonium chloride, potassium nitrate crystals and ammonium chloride crystals are required to be separated from the mixed materials, and usually, the potassium nitrate crystals and the ammonium chloride crystals cannot be separated efficiently, so that great difficulty is brought to post-process refining and purifying of the potassium nitrate, and further, under the condition of greatly improving the production cost, stable production of high-quality potassium nitrate products is difficult to ensure.
Therefore, we propose a flotation separation device for producing potassium nitrate by an ammonium nitrate double decomposition method.
Disclosure of utility model
Technical problem to be solved
Aiming at the defects of the prior art, the utility model provides a flotation separation device for producing potassium nitrate by an ammonium nitrate double decomposition method, which solves the technical problems that a large amount of mixed crystal materials of potassium nitrate and ammonium chloride can be separated out and formed when the potassium nitrate is crystallized by cooling reaction materials for the first time, and potassium nitrate and ammonium chloride crystals cannot be separated efficiently.
Technical proposal
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
The flotation separation device for producing potassium nitrate by an ammonium nitrate double-decomposition method comprises a flotation system, wherein the flotation system comprises a flotation thickener, a filter tank, a circulating flotation pump, a centrifuge and a spiral elevator, the flotation thickener, the filter tank and the circulating flotation pump are connected with each other through pipelines, the bottom of the flotation thickener is connected with the bottom of the spiral elevator, the spiral elevator is obliquely arranged, and the centrifuge is arranged below the spiral elevator;
A communication pipe is arranged on one side of the top of the spiral lifting machine, and is used for enabling mother liquor and tiny crystals to flow back into the flotation thickener, and a discharge port is formed in one side, away from the communication pipe, of the spiral lifting machine, so that materials leaving the discharge port directly enter the centrifuge.
In a further embodiment, the flotation thickener comprises a shell, wherein a stirring motor is arranged on the shell, a stirring shaft is arranged in the shell, a power source of the stirring motor is connected with the stirring shaft, stirring blades are arranged on the stirring shaft, a feeding hole is formed in the top of the shell, overflow holes are formed in two sides of the shell and used for discharging ammonium chloride crystals and mother liquor after flotation into a filter tank, a discharging hole is formed in the bottom of the shell, and the discharging hole is communicated with the spiral elevator.
In a further embodiment, the filter tank comprises a filter tank and a filter layer, the supports are respectively arranged at the periphery of the bottom end of the filter tank, the filter layer is arranged on the filter tank, the filter control valves are respectively arranged at two sides of the filter tank, and the two groups of filter control valves are used for enabling ammonium chloride and mother liquor to enter and exit the filter tank.
In a further embodiment, the top end of the centrifuge is provided with a hopper, and the centrifuge is provided with a screw feeder which is used for rapidly conveying materials in the hopper into the centrifuge so that the centrifuge can perform centrifugal dehydration operation on the materials.
In a further embodiment, the filter tank and the centrifuge are both connected with a mother liquor tank through pipelines, the mother liquor tank is used for recovering mother liquor and potassium chloride crystals, a mother liquor motor is installed on the mother liquor tank, a mother liquor shaft is installed in the mother liquor tank, a power source of the mother liquor motor is connected with the mother liquor shaft, and a mother liquor blade is installed on the mother liquor shaft.
In a further embodiment, the filter layer comprises a support plate, a protective pressing plate and a plurality of layers of filter screens, the plurality of layers of filter screens are installed at the top end of the support plate, the support plate is used for fixing the plurality of layers of filter screens, and the protective pressing plate is installed at the top end of the filter screen.
In a further embodiment, the filter box is arranged in an overall inclined manner so that ammonium chloride and mother liquor are discharged out of the filter tank more quickly.
Advantageous effects
The utility model provides a flotation separation device for producing potassium nitrate by an ammonium nitrate double decomposition method. Compared with the prior art, the method has the following beneficial effects:
1. The device can fundamentally solve the separation of the potassium nitrate and the ammonium chloride when the ammonium nitrate is subjected to double decomposition to produce the potassium nitrate for one time, and provides good basic conditions for producing high-quality potassium nitrate after one time of re-dissolution and refining.
2. The device can improve the comprehensive quality of the crude potassium nitrate, greatly reduce the water washing amount of the crude potassium nitrate, improve the production efficiency, and reduce the evaporation energy consumption for keeping the water balance of the system.
3. By adopting the technical device, the potassium nitrate content in overflow materials can be reduced while the quality of crude potassium nitrate can be improved, and the raw material recovery efficiency can be improved.
4. The device can run for a long period, has less maintenance amount and is simple to maintain.
5. The continuous automation and stable operation of the large-scale production can be realized fundamentally.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a process flow diagram of the present embodiment.
Fig. 2 is a schematic structural diagram of the flotation thickener according to this example.
Fig. 3 is a schematic structural diagram of the filter tank according to the present embodiment.
The reference numerals in the figures are:
1. a flotation thickener; 101. a housing; 102. a feed inlet; 103. a discharge port; 104. a stirring motor; 105. a stirring shaft; 106. stirring blades; 107. an overflow port;
2. a filter tank; 201. a filter box; 202. a filter layer; 203. a bracket; 204. a filter control valve;
3. a centrifuge; 301. a hopper; 302. a screw feeder;
4. a spiral elevator; 401. a communicating pipe; 402. a discharge port;
5. A mother liquor tank; 501. a mother liquor motor; 502. a mother liquor shaft; 503. mother liquor blades;
6. a circulating flotation pump.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The flotation separation device for producing potassium nitrate by the ammonium nitrate double decomposition method solves the problems that a large amount of mixed crystal materials of potassium nitrate and ammonium chloride can be separated out and formed when the reaction materials are cooled for the first time to crystallize potassium nitrate, and the potassium nitrate and ammonium chloride crystals cannot be separated out efficiently, realizes the efficient separation of the potassium nitrate and the ammonium chloride crystals when in use, greatly reduces the washing water quantity when the potassium nitrate primary product is refined, can ensure that the content reaches more than 98 percent after primary crystallization washing separation, and provides reliable guarantee for reaching high-quality potassium nitrate after re-dissolution refining.
The technical scheme in the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
In the prior art, ammonium nitrate double decomposition can separate out and form a large amount of mixed crystal materials of potassium nitrate and ammonium chloride, potassium nitrate crystals and ammonium chloride crystals are required to be separated from the mixed materials, and usually, the potassium nitrate and the ammonium chloride crystals cannot be separated efficiently, so that great difficulty is brought to post-process refining and purifying of potassium nitrate, and further, under the condition of greatly improving the production cost, stable production of high-quality potassium nitrate products is difficult to ensure, and further flotation thickening is required to be carried out on the precipitated potassium nitrate crystals through a spiral lifting machine, so that mother liquor and the ammonium chloride crystals are returned to the inside of a flotation thickener for flotation thickening again;
besides, after centrifugal dehydration of materials, the centrifugal machine needs to wash, a large amount of water sources are generally consumed, waste of water resources is easily caused, and meanwhile, the washing effect cannot be guaranteed.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Embodiment one:
Referring to fig. 1 to 3, a flotation separation device for producing potassium nitrate by an ammonium nitrate double decomposition method comprises a flotation system, wherein the flotation system comprises a flotation thickener 1, a filter tank 2, a circulating flotation pump 6, a centrifugal machine 3 and a spiral lifter 4, the flotation thickener, the filter tank 2 and the circulating flotation pump 6 are connected with each other through pipelines, the bottom of the flotation thickener 1 is connected with the bottom of the spiral lifter 4, the spiral lifter 4 is obliquely arranged, and the centrifugal machine 3 is arranged below the spiral lifter 4;
A communication pipe 401 is arranged at one side of the top of the spiral lifting machine 4, the communication pipe 401 is used for allowing mother liquor and tiny crystals to flow back into the flotation thickener 1, a discharge port 402 is formed in one side of the spiral lifting machine 4, which is far away from the communication pipe 401, of the spiral lifting machine 4, so that materials leaving the discharge port 402 directly enter the centrifuge 3;
The crystallization slurry from the crystallizer discharge pump (or by using the potential difference self-flowing) falls to the rear of the overflow port 107 along the stirring direction in an inclined way, and the specific gravity of the mother solution is as follows: 1.28 to 1.3g/ml, viscosity: 35-40 cp, specific weight of ammonium chloride: 1.53, specific gravity of potassium nitrate: 2.11, regulating the rotation speeds of a stirring motor 104 and a mother liquor circulating pump, wherein potassium nitrate is quickly sunk, ammonium chloride is in a suspension state, flows through an overflow port 107 into a flotation thickener 1, enters a mother liquor tank 5 together with ammonium chloride, part of mother liquor passes through a filter screen to the lower part of the filter tank 2, is pumped into the flotation thickener 1 through the circulating pump at a certain speed, better floats out ammonium chloride (no obvious potassium nitrate crystal flows out of the overflow port 107), purer potassium nitrate slurry enters a spiral elevator 4 from a discharge port 103 at the bottom of the flotation thickener 1 (the height of an opening of the communication port is about 15cm of the liquid level in the flotation thickener 1), and a communication pipe 401 is arranged at the upper part of the spiral elevator 4, so that the mother liquor and tiny crystals (mainly ammonium chloride crystals, the spiral elevator 4 has a certain flotation effect) flow back into the flotation thickener 1 together, and further flotation separates the ammonium chloride, meanwhile reduces the mother liquor entering the centrifugal machine 3, and improves the centrifugal dewatering effect;
the centrifuge 3 is an HR-double-stage piston pushing centrifuge 3 with a washing function, the mother liquor is replaced by centrifugal washing with washing liquid, the centrifugal mother liquor (with a small amount of potassium nitrate crystal fine crystals) is subjected to sedimentation of potassium nitrate by a sedimentation tank, and clear liquid enters a crystallization mother liquor tank 5, and the settled potassium nitrate slurry returns to the crystallizer.
The flotation thickener 1 comprises a shell 101, wherein a stirring motor 104 is arranged on the shell 101, a stirring shaft 105 is arranged in the shell 101, a power source of the stirring motor 104 is connected with the stirring shaft 105, a stirring blade 106 is arranged on the stirring shaft 105, a feed inlet 102 is arranged at the top of the shell 101, overflow ports 107 are arranged at two sides of the shell 101, the overflow ports 107 are used for discharging the ammonium chloride crystals and mother liquor after flotation into a filter tank 2, a discharge port 103 is arranged at the bottom of the shell 101, and the discharge port 103 is communicated with a spiral elevator 4;
When potassium nitrate is produced by ammonium nitrate double decomposition, the main materials of the solution before the first high-temperature crystallization are composed of the following components in concentration: chloride ions: 200g/l, ammonium ion: 87g/l, potassium nitrate: 576g/l, specific gravity of material: 1.415, the temperature of the crystallization end point material is 32 ℃, the ammonium chloride content in the mixed crystallization material is 18,6%, the mother liquor is used for circularly flushing flotation (intermittent operation) in a sedimentation flotation tank, the ammonium chloride content in potassium nitrate after flotation is very uneven, the ammonium chloride content in a flowing dead angle area reaches 20%, the average content is 3-5%, the detection is carried out after filtering and drying the flotation overflow material, the potassium nitrate content is 34.5%, the ammonium chloride content is 62.6%, the centrifugal dehydration (without centrifugal washing) is carried out after the flotation thickening by using the device of the technology, the ammonium chloride content in potassium nitrate is 2.17%, the ammonium chloride content after the centrifugation (one-time washing liquid of 0.06-0.08 m < 3 >) is used for washing per ton of material is only 1.76%, the drying detection is carried out after filtering and drying the flotation overflow material, the potassium nitrate content is 10.85%, and the ammonium chloride content is 85.7%.
Referring to fig. 3, the filter tank 2 comprises a filter tank 201 and a filter layer 202, wherein supports 203 are respectively arranged around the bottom end of the filter tank 201, the filter layer 202 is arranged on the filter tank 201, filter control valves 204 are arranged on two sides of the filter tank 201, and two groups of filter control valves 204 are used for enabling ammonium chloride and mother liquor to enter and exit the filter tank 2.
Embodiment two:
Referring to fig. 1 and 2, a hopper 301 is installed at the top end of a centrifuge 3, a screw feeder 302 is installed at the centrifuge 3, and the screw feeder 302 is used for rapidly conveying materials in the hopper 301 into the centrifuge 3 so that the centrifuge 3 performs centrifugal dehydration operation on the materials;
The content of crude potassium nitrate ammonium chloride obtained by centrifugal dehydration (washing by adding crude washing liquid during centrifugal dehydration) of potassium nitrate slurry after flotation thickening can be less than 2.5%, the content of ammonium chloride in the separated potassium nitrate crude product obtained by the centrifugal dehydration of the potassium nitrate slurry after the first continuous washing (washing in a continuous washing kettle by using second washing liquid) is less than 0.7% (the potassium chloride is dissolved by the first washing liquid), after the second washing (washing by using 0.3m < 3 > of recrystallization mother liquor and 0.3-0.4 m < 3 > of vacuum flash crystallization condensed water of 1 ton of crude product), the content of ammonium chloride after centrifugal dehydration of the washed crude product is less than 0.2%, the main content of potassium nitrate is more than 98.0%, and the main content of the recrystallized product after the re-dissolution refining can reach more than 99.8%, and various other indexes can reach the quality standards of industrial quality and molten salt grade potassium nitrate.
Referring to fig. 1, a filter tank 2 and a centrifuge 3 are both connected with a mother liquor tank 5 through pipes, the mother liquor tank 5 is used for recovering mother liquor and potassium chloride crystals, a mother liquor motor 501 is installed on the mother liquor tank 5, a mother liquor shaft 502 is installed inside the mother liquor tank 5, a power source of the mother liquor motor 501 is connected with the mother liquor shaft 502, and a mother liquor blade 503 is installed on the mother liquor shaft 502.
The filter layer 202 comprises a supporting plate, a protective pressing plate and a plurality of layers of filter screens, the plurality of layers of filter screens are installed at the top end of the supporting plate, the supporting plate is used for fixing the plurality of layers of filter screens, and the protective pressing plate is installed at the top end of the filter screen.
The filter box 201 is arranged in an overall inclined way so that ammonium chloride and mother liquor can be discharged out of the filter tank 2 more quickly;
Working principle: the technical device mainly comprises a flotation thickener 1 (see structural schematic diagram 2 of the flotation thickener 1), a filter tank 2 (see structural schematic diagram 3 of the filter tank 2), a circulating flotation pump 6, a spiral lifter 4 and the like, wherein a discharge pump (or a potential difference is utilized) of the continuous crystallizer enables crystallized mixed materials to enter the flotation thickener 1 along a certain angle and in a stirring direction, the mixed materials enter the flotation thickener 1 by leaning on a wall behind an overflow port 107, the rotation speeds of a stirrer and the circulating flotation pump 6 are regulated through frequency conversion, potassium nitrate crystals sink to the bottom of the flotation thickener 1, the potassium nitrate crystals enter the spiral lifter 4 through a discharge port 103, a return pipe is arranged at the upper part of the lifter, mother liquor and ammonium chloride which are not separated can flow back into the flotation thickener 1 together, the lifter has a further flotation thickening function besides the potassium nitrate materials, the content of the potassium nitrate crystals entering the centrifuge 3 can be more than 70%, the load of the centrifuge 3 is lightened, a better condition is provided for a centrifugal dewatering effect is provided for a centrifugal system, the potassium nitrate slurry is sent into the centrifuge 3 through a spiral feeder 302 of the centrifuge 3 to be dewatered, and the centrifugal washing solution is washed by one time, the mother liquor and the mother liquor which is less than 2.5% of the potassium chloride can be obtained together.
The ammonium chloride is in a suspension state in the flotation thickener 1 under the action of the stirring and circulating flotation pump 6, enters the ammonium chloride filter tank 2 together with mother liquor through the overflow port 107, adopts a plurality of layers of 316l stainless steel nets as a filter screen, adopts a 6 mm-thick 316 stainless steel pore plate as a bottom support plate, adopts 60, 80 and 120 (2 layers) 60 meshes respectively from bottom to top, adopts a 4 mm-thick stainless steel pore (phi 6 mm) plate as a protective pressing plate on the uppermost surface, and returns part of clear liquid after filtration to the flotation thickener 1 through the circulating flotation pump 6 to improve the flotation effect, and the ammonium chloride on the filter screen flows into the mother liquor tank 5 together under the action of the mother liquor, is preheated by high-temperature (65-75 ℃) evaporation condensate to dissolve the ammonium chloride, and then is sent to the evaporation preheater for heating and evaporation concentration.
In summary, compared with the prior art, the method has the following beneficial effects:
1. The device can fundamentally solve the separation of the potassium nitrate and the ammonium chloride when the ammonium nitrate is subjected to double decomposition to produce the potassium nitrate for one time, and provides good basic conditions for producing high-quality potassium nitrate after one time of re-dissolution and refining.
2. The device can improve the comprehensive quality of the crude potassium nitrate, greatly reduce the water washing amount of the crude potassium nitrate, improve the production efficiency, and reduce the evaporation energy consumption for keeping the water balance of the system.
3. By adopting the technical device, the potassium nitrate content in overflow materials can be reduced while the quality of crude potassium nitrate can be improved, and the raw material recovery efficiency can be improved.
4. The device can run for a long period, has less maintenance amount and is simple to maintain.
5. The continuous automation and stable operation of the large-scale production can be realized fundamentally.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (7)
1. The flotation separation device for producing potassium nitrate by an ammonium nitrate double-decomposition method is characterized by comprising a flotation system, wherein the flotation system comprises a flotation thickener (1), a filter tank (2), a circulating flotation pump (6), a centrifuge (3) and a spiral elevator (4), the flotation thickener, the filter tank (2) and the circulating flotation pump (6) are connected with each other through pipelines, the bottom of the flotation thickener (1) is connected with the bottom of the spiral elevator (4), the spiral elevator (4) is obliquely arranged, and the centrifuge (3) is arranged below the spiral elevator (4);
The utility model discloses a flotation thickener, including flotation thickener (1), screw hoist (4), discharge port (402) are seted up to screw hoist (4), screw hoist (4) top one side is installed communicating tube (401), communicating tube (401) are used for mother liquor and tiny crystal backward flow to flotation thickener (1) inside, screw hoist (4) discharge port (402) are kept away from to communicating tube (401) one side to make the material that leaves discharge port (402) directly get into inside centrifuge (3).
2. The flotation separation device according to claim 1, characterized in that the flotation thickener (1) comprises a shell (101), a stirring motor (104) is arranged on the shell (101), a stirring shaft (105) is arranged in the shell (101), a power source of the stirring motor (104) is connected with the stirring shaft (105), stirring blades (106) are arranged on the stirring shaft (105), a feeding hole (102) is formed in the top of the shell (101), overflow holes (107) are formed in two sides of the shell (101), the overflow holes (107) are used for discharging the floated ammonium chloride crystals and mother liquor into the filter tank (2), a discharging hole (103) is formed in the bottom of the shell (101), and the discharging hole (103) is communicated with the spiral elevator (4).
3. The flotation separation device according to claim 1, characterized in that the filter tank (2) comprises a filter tank (201) and a filter layer (202), wherein the periphery of the bottom end of the filter tank (201) is provided with a support (203), the filter tank (201) is provided with the filter layer (202), both sides of the filter tank (201) are provided with filter control valves (204), and two groups of the filter control valves (204) are used for allowing ammonium chloride and mother liquor to enter and exit the filter tank (2).
4. A flotation separation device according to claim 1, characterized in that the top end of the centrifuge (3) is provided with a hopper (301), the centrifuge (3) is provided with a screw feeder (302), and the screw feeder (302) is used for rapidly conveying the materials in the hopper (301) into the centrifuge (3) so that the centrifuge (3) performs centrifugal dewatering operation on the materials.
5. The flotation separation device according to claim 1, characterized in that the filter tank (2) and the centrifuge (3) are connected with a mother liquor tank (5) through pipelines, the mother liquor tank (5) is used for recovering mother liquor and potassium chloride crystals, a mother liquor motor (501) is installed on the mother liquor tank (5), a mother liquor shaft (502) is installed in the mother liquor tank (5), a power source of the mother liquor motor (501) is connected with the mother liquor shaft (502), and a mother liquor blade (503) is installed on the mother liquor shaft (502).
6. A flotation separation device according to claim 3, characterized in that the filter layer (202) comprises a support plate, a protective pressure plate and several layers of filter screens, the support plate being provided with several layers of filter screens at its top end, the support plate being adapted to fix several layers of filter screens, the filter screen top end being provided with a protective pressure plate.
7. A flotation separation device according to claim 3, characterized in that the filter box (201) is arranged with an overall inclination so that ammonium chloride and mother liquor are discharged out of the filter tank (2) more quickly.
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| CN202323012396.5U CN221183161U (en) | 2023-11-08 | 2023-11-08 | Flotation separation device for producing potassium nitrate by ammonium nitrate double decomposition method |
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| CN202323012396.5U CN221183161U (en) | 2023-11-08 | 2023-11-08 | Flotation separation device for producing potassium nitrate by ammonium nitrate double decomposition method |
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