CN107140661B - A method of flash distillation cooling production potassium nitrate - Google Patents
A method of flash distillation cooling production potassium nitrate Download PDFInfo
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- CN107140661B CN107140661B CN201710428653.3A CN201710428653A CN107140661B CN 107140661 B CN107140661 B CN 107140661B CN 201710428653 A CN201710428653 A CN 201710428653A CN 107140661 B CN107140661 B CN 107140661B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D9/00—Nitrates of sodium, potassium or alkali metals in general
- C01D9/08—Preparation by double decomposition
- C01D9/10—Preparation by double decomposition with ammonium nitrate
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
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Abstract
The invention discloses a kind of methods of flash distillation cooling production potassium nitrate, follow the steps below: (1) raw material is prepared, (2) metathesis reaction, (3) the flash distillation cooling of potassium nitrate solution, (4) crystallization of potassium nitrate, (5) dewatered drying of potassium nitrate finally obtains finished product potassium nitrate, the water vapour after flash distillation is connected to surface air cooler in step (3), water vapour is further cooled down, the pressure for reducing water vapour accelerates the efficiency of solution crystallisation by cooling in flash vessel.Flash evaporation technology is applied in the production process of potassium nitrate by the present invention, existing evaporative effect has cooling effect again, play the role of removing moisture and cooling solution simultaneously, solution is concentrated by evaporation and is organically combined with two operating procedures of crystallisation by cooling, gas-particle heat transfer effect is enhanced, shorten the potassium nitrate decrease temperature crystalline time, energy-saving effect is significant, and the present invention takes up little area, small investment, low energy consumption, has good promotional value.
Description
Technical field
The invention belongs to agrochemical production technical fields, and in particular to a method of flash distillation cooling production potassium nitrate.
Background technique
Potassium nitrate is a kind of important inorganic chemical product and without chlorine nitrogen-potassium binary high-quality compound fertilizer, is particularly suitable for cigarette
Grass, citrus, cotton, flowers, tealeaves, beet, fruit etc..It is continued to develop recently as China's agricultural economy, potassium nitrate is in agriculture
Amount of application in industry is continuously increased, and potassium nitrate market constantly increases, and potassium nitrate industry is improved and develops.Country's nitric acid at present
The production method of potassium mainly uses double decomposition circulation process and ion-exchange, and double decomposition circulation process is because raw material is easy to get, simple process,
It is domestic most competitive production method without " three wastes ".If however straight by the potassium nitrate that double decomposition circulation process is produced
It connecing and is delivered to crystallization in crystallizer, on the one hand it is the temperature drift in potassium nitrate crystal device that crystallization time is long, and effect is undesirable,
It is unfavorable for potassium nitrate crystals precipitation；Another aspect nitric acid potassium concn is not high, and solution saturation degree is low, and crystal is precipitated slow.
Application No. is 201510173413.4 Chinese invention patents to disclose the method that recrystallization method prepares industrial potassium nitrate,
This method is the method for preparing industrial potassium nitrate as the recrystallization method of raw material using potassium nitrate crude product, using 2~5 grades of continuous crystallisation sides
Formula, crystallization apparatus are composed in series by 1 flash vessel, 2~5 crystallizer liquid phases.Technical solution in the disclosure patent, which exists, to be set
It is standby bulky, it takes up a large area, investment is big, the high defect of energy consumption.Therefore, it is necessary to develop a kind of device structure is compact, land occupation
It is small, small investment, and solution rapid evaporation can be made to be concentrated, saturation degree is improved, the production potassium nitrate of crystallisation by cooling time is shortened
Method.
Summary of the invention
The purpose of the present invention is to provide a kind of solution are concentrated by evaporation organically to tie with two operating procedures of crystallisation by cooling
Altogether, gas-particle heat transfer effect is enhanced, shortens the potassium nitrate decrease temperature crystalline time, energy-saving effect is significant, and device structure is compact, accounts for
Ground area is small, has not only saved the energy but also the method for the flash distillation cooling production potassium nitrate of investment reduction.
To achieve the above object, the technical solution adopted by the present invention is that: a method of flash distillation cooling production potassium nitrate, press
It is carried out according to following steps:
A, raw material is prepared: solid potassium chloride being launched into potassium chloride dissolving tank and is 25%- as concentration with hot water preparation
30%, ammonium nitrate raw material liquid is delivered in ammonium nitrate solution slot and is added using steam by the Klorvess Liquid that 55 DEG C -58 DEG C of temperature
It is 80%-85%, the ammonium nitrate solution that 110 DEG C -120 DEG C of temperature that heat, which is configured to concentration,；
B, metathesis reaction: being that 1:1 is added by Klorvess Liquid prepared in step A and ammonium nitrate solution in molar ratio
Hybrid reaction is carried out in mixing channel, stirring to get temperature is 55 DEG C~60 DEG C mixed solutions；
C, the flash distillation cooling of potassium nitrate solution: the mixed solution of potassium chloride and ammonium nitrate in step B is defeated by feed pump
It is sent in flash vessel, flash vessel includes cylinder, and cylinder top and bottom are respectively arranged with upper cover and lower head, and side is provided with
Feed pipe, middle part are provided with central circulating tube, and feed pipe is connected with central circulating tube, and the bottom of lower head is discharge nozzle, upper envelope
The top of head connects steam outlet pipe；Flash vessel is evacuated by starting vacuum pump, and absolute pressure control, will in 6KPa~9KPa
The mixed solution of potassium chloride and ammonium nitrate is entered in flash vessel by feed pump from feed pipe, is constantly followed along central circulating tube
Ring, the pressure reduction of solution surface, solution boiling point also decrease, and the solution flash distillation close to boiling point generates water vapour, water vapour
It is delivered to surface air cooler from the top of flash vessel by steam outlet pipe, the temperature of steam (vapor) outlet is 40 DEG C~45 DEG C, and flash distillation water is steamed
Vapour absorbs solution self heat, and solution temperature is made to be down to 40 DEG C~50 DEG C, and potassium nitrate crystals are precipitated, and obtains potassium nitrate quality point
Number is the concentration magma of 25%-30%, is sent in level-one vacuum crystallizer by the discharge nozzle of flasher base；
D, the crystallization of potassium nitrate: the absolute pressure in control level-one vacuum crystallizer is 3KPa~5KPa, and liquidus temperature is
30 DEG C~35 DEG C, further cone nitric acid potassium crystallization slurry；The potassium nitrate crystal come out from level-one vacuum crystallizer is starched into conveying again
To secondary vacuum crystallizer, in 1KPa~3KPa, liquidus temperature is 20 DEG C~25 DEG C for absolute pressure control；
E, the dewatered drying of potassium nitrate: the potassium nitrate magma in step D is delivered to thickener, potassium nitrate magma is in stiff
Device is concentrated, and the molten slurry after concentration is delivered to centrifuge again and is dehydrated, and liquid phase is sent into potassium nitrate mother liquor tank, and solid phase is by spiral
Conveyer is transported to dryer and is dried, and finally obtains finished product potassium nitrate.
Further, flash vessel includes cylinder, and cylinder top and bottom are respectively arranged with upper cover and lower head, and side is set
It is equipped with feed pipe, middle part is provided with central circulating tube, and feed pipe is connected with central circulating tube, and the bottom of lower head is discharge nozzle,
The top of upper cover connects steam outlet pipe.
Further, the hot water of solid potassium chloride is dissolved in step A from high-order hot water storgae, hot water temperature is 80 DEG C~
90℃。
Further, ammonium nitrate solution slot is formed in parallel by 4~8 in step A.
Further, dryer is air heat drier.
The principle of the present invention is: flash distillation is a kind of phase transition process of liquid, i.e., certain pressure and at a temperature of saturated solution
Body or unsaturated liquid when saturation pressure at a temperature of pressure drops to certain, will enter saturation region and begin vaporization, and
With the decline of pressure, vaporization is continuously improved.In flash process, a part of sensible heat of liquid, which is changed into rapidly, to be evaporated
Latent heat needed for journey, as a result liquid temperature in flash evapn decreases, therefore flash process is actually one continuous
The process evaporated and cooled.
In metathetical in the mill solution of potassium nitrate, main group becomes NH4 +、K+、Cl-、NO3 -And H2The mixing of O system
Liquid.For the potassium nitrate solution of certain solute composition, under the conditions of different pressures, solution boiling point is different, and the lower solution of pressure
Boiling point is also lower；Meanwhile pressure is lower, water evaporation latent heat is higher instead in solution.By vacuum pumping method, potassium nitrate can be made
Pressure reduction on liquid level of solution, solution boiling point also decrease, and the solution flash distillation close to boiling point generates water vapour, to reach
The purpose of concentration；It meanwhile in flash process, since flash-steam absorbs solution self heat, can be reduced, mix in solution
Solution temperature decline is closed, has achieved the purpose that potassium nitrate crystallisation by cooling.
The beneficial effects of the present invention are: flash evaporation technology is applied in the production process of potassium nitrate by the present invention, it is existing
Evaporative effect has cooling effect again, while playing the role of removing moisture and cooling solution, and solution is concentrated by evaporation and is tied with cooling
Brilliant two operating procedures organically combine, and enhance gas-particle heat transfer effect, shorten the potassium nitrate decrease temperature crystalline time, energy conservation effect
Fruit is significant；The water vapour come out by flash vessel is accessed surface air cooler by the present invention simultaneously, and water vapour is cooled down in surface air cooler, fast
Speed reduces the pressure in flash vessel, and water vapour vaporization is continuously improved, and increases the speed of moisture evaporation, has simplified multistage
Crystallizer, it is compact-sized, it takes up little area, small investment, low energy consumption, has good promotional value.
Detailed description of the invention
Fig. 1 is process flow chart of the invention；
Fig. 2 is the structural schematic diagram of flash vessel in Fig. 1；
In Fig. 1: 1- ammonium nitrate solution slot, the steam inlet 2-, 3- potassium chloride dissolving tank, 4- high position hot water storgae, 5- vacuum pump,
6- surface air cooler, 7- flash vessel, 8- level-one vacuum crystallizer, 9- secondary vacuum crystallizer, 10- thickener, 11- centrifuge, 12- spiral shell
Revolve conveyer, 13- dryer, 14- potassium nitrate mother liquor tank, 15- feed pump, 16- mixing channel.
In Fig. 2: 71- discharge nozzle, 72- lower head, 73- feed pipe, 74- central circulating tube, 75- cylinder, 76- upper cover,
77- steam outlet pipe.
Specific embodiment
Below with reference to example is applied, the present invention is further illustrated, but the present invention is limited in any way,
Based on present invention teach that made any changes and modifications, all belong to the scope of protection of the present invention.
Embodiment 1
A kind of method of flash distillation cooling production potassium nitrate as shown in Figs. 1-2, follows the steps below:
A, raw material is prepared: solid potassium chloride is launched into potassium chloride dissolving tank 3 and is 25% as concentration with hot water preparation,
Ammonium nitrate raw material liquid is delivered in ammonium nitrate solution slot 1 and inputs steam from steam inlet 2 by the Klorvess Liquid that 55 DEG C of temperature
Being configured to concentration is 80%, the ammonium nitrate solution that 110 DEG C of temperature；
B, metathesis reaction: being that 1:1 is added by Klorvess Liquid prepared in step A and ammonium nitrate solution in molar ratio
Hybrid reaction is carried out in mixing channel 16, stirring to get temperature is 55 DEG C of mixed solutions；
C, the mixed solution of potassium chloride and ammonium nitrate in step B the flash distillation cooling of potassium nitrate solution: is passed through into feed pump 15
It is transported in flash vessel 7 by feed pipe 73, flash vessel 7 is a cylinder 75, and top and bottom end are respectively arranged with 76 He of upper cover
Lower head 72, flash vessel 7 is interior to be evacuated by vacuum pump 5, and absolute pressure is controlled in 6KPa, into the potassium nitrate edge of flash vessel 7
Central circulating tube 74 constantly recycles, and the pressure reduction of solution surface, solution boiling point also decreases, and the solution close to boiling point dodges
It steams and generates water vapour, water vapour is delivered to surface air cooler 6, the temperature of steam (vapor) outlet by steam outlet pipe 77 from the top of flash vessel 7
Degree is 40 DEG C~45 DEG C, and flash-steam absorbs solution self heat, be can be reduced in solution, and solution temperature is down to 40 DEG C, analysis
Potassium nitrate crystals out obtain the concentration magma that potassium nitrate mass fraction is 25%-30%；Pass through the discharge nozzle of 7 bottom of flash vessel
71 are sent in level-one vacuum crystallizer 8；
D, the crystallization of potassium nitrate: the absolute pressure in level-one vacuum crystallizer 8 is controlled in 3KPa~5KPa, and liquidus temperature is
It 30 DEG C~35 DEG C, after concentration magma crystallizes in level-one vacuum crystallizer 8, and is sent in secondary vacuum crystallizer 9, second level is true
In 1KPa~3KPa, liquidus temperature is 20 DEG C~25 DEG C for the absolute pressure control of empty crystallizer 9；
E, the dewatered drying of potassium nitrate: the potassium nitrate crystals in step D are delivered to thickener 10, potassium nitrate crystals are thick
Thick device 10 is concentrated, and the molten slurry after concentration is delivered to centrifuge 11 again and is dehydrated, and liquid phase is sent into potassium nitrate mother liquor tank 14, Gu
Dryer 13 mutually is transported to by screw conveyor 12 to be dried, and finished product potassium nitrate is finally obtained.
Using potassium nitrate product obtained by the present embodiment: potassium oxide content 45.02%, total nitrogen content 14.01%, chloride ion contains
Amount 0.65%, moisture content 0.32% reaches potassium nitrate Grade A standard (reference standard: GB/T 20784-2013 agricultural nitre
Sour potassium).
Embodiment 2
It is a kind of as shown in Figure 1 to flash the method for cooling down and producing potassium nitrate:
A kind of method of flash distillation cooling production potassium nitrate as shown in Figs. 1-2, follows the steps below:
A, raw material is prepared: solid potassium chloride being launched into potassium chloride dissolving tank 3 and is as concentration with hot water preparation
27.5%, ammonium nitrate raw material liquid is delivered in ammonium nitrate solution slot 1 and from steam inlet by the Klorvess Liquid that 56.5 DEG C of temperature
It is 82.5% that 2 input steam, which are configured to concentration, the ammonium nitrate solution that 115 DEG C of temperature；
B, metathesis reaction: being that 1:1 is added by Klorvess Liquid prepared in step A and ammonium nitrate solution in molar ratio
Hybrid reaction is carried out in mixing channel 16, stirring to get temperature is 57.5 DEG C of mixed solutions；
C, the mixed solution of potassium chloride and ammonium nitrate in step B the flash distillation cooling of potassium nitrate solution: is passed through into feed pump 15
It is transported in flash vessel 7 by feed pipe 73, flash vessel 7 is a cylinder 75, and top and bottom end are respectively arranged with 76 He of upper cover
Lower head 72, flash vessel 7 is interior to be evacuated by vacuum pump 5, and absolute pressure is controlled in 7.5KPa, into the potassium nitrate of flash vessel 7
It is constantly recycled along central circulating tube 74, the pressure reduction of solution surface, solution boiling point also decreases, close to the solution of boiling point
Flash distillation generates water vapour, and water vapour is delivered to surface air cooler 6 by steam outlet pipe 77 from the top of flash vessel 7, steam (vapor) outlet
Temperature is 40 DEG C~45 DEG C, and flash-steam absorbs solution self heat, can be reduced in solution, and solution temperature is down to 45 DEG C,
Potassium nitrate crystals are precipitated, obtain the concentration magma that potassium nitrate mass fraction is 25%-30%；Pass through the discharging of 7 bottom of flash vessel
Pipe 71 is sent in level-one vacuum crystallizer 8；
D, the crystallization of potassium nitrate: the absolute pressure in level-one vacuum crystallizer 8 is controlled in 3KPa~5KPa, and liquidus temperature is
It 30 DEG C~35 DEG C, after concentration magma crystallizes in level-one vacuum crystallizer 8, and is sent in secondary vacuum crystallizer 9, second level is true
In 1KPa~3KPa, liquidus temperature is 20 DEG C~25 DEG C for the absolute pressure control of empty crystallizer 9；
E, the dewatered drying of potassium nitrate: the potassium nitrate crystals in step D are delivered to thickener 10, potassium nitrate crystals are thick
Thick device 10 is concentrated, and the molten slurry after concentration is delivered to centrifuge 11 again and is dehydrated, and liquid phase is sent into potassium nitrate mother liquor tank 14, Gu
Dryer 13 mutually is transported to by screw conveyor 12 to be dried, and finished product potassium nitrate is finally obtained.
Using potassium nitrate product obtained by the present embodiment: potassium oxide content 45.11%, total nitrogen content 14.20%, chloride ion contains
Amount 0.66%, moisture content 0.35% reaches potassium nitrate Grade A standard (reference standard: GB/T 20784-2013 agricultural nitre
Sour potassium).
Embodiment 3
It is a kind of as shown in Figure 1 to flash the method for cooling down and producing potassium nitrate:
A kind of method of flash distillation cooling production potassium nitrate as shown in Figs. 1-2, follows the steps below:
A, raw material is prepared: solid potassium chloride is launched into potassium chloride dissolving tank 3 and is 30% as concentration with hot water preparation,
Ammonium nitrate raw material liquid is delivered in ammonium nitrate solution slot 1 and inputs steam from steam inlet 2 by the Klorvess Liquid that 58 DEG C of temperature
Being configured to concentration is 85%, the ammonium nitrate solution that 120 DEG C of temperature；
B, metathesis reaction: being that 1:1 is added by Klorvess Liquid prepared in step A and ammonium nitrate solution in molar ratio
Hybrid reaction is carried out in mixing channel 16, stirring to get temperature is 60 DEG C of mixed solutions；
C, the mixed solution of potassium chloride and ammonium nitrate in step B the flash distillation cooling of potassium nitrate solution: is passed through into feed pump 15
It is transported in flash vessel 7 by feed pipe 73, flash vessel 7 is a cylinder 75, and top and bottom end are respectively arranged with 76 He of upper cover
Lower head 72, flash vessel 7 is interior to be evacuated by vacuum pump 5, and absolute pressure is controlled in 9KPa, into the potassium nitrate edge of flash vessel 7
Central circulating tube 74 constantly recycles, and the pressure reduction of solution surface, solution boiling point also decreases, and the solution close to boiling point dodges
It steams and generates water vapour, water vapour is delivered to surface air cooler 6, the temperature of steam (vapor) outlet by steam outlet pipe 77 from the top of flash vessel 7
Degree is 40 DEG C~45 DEG C, and flash-steam absorbs solution self heat, be can be reduced in solution, and solution temperature is down to 50 DEG C, analysis
Potassium nitrate crystals out obtain the concentration magma that potassium nitrate mass fraction is 25%-30%；Pass through the discharge nozzle of 7 bottom of flash vessel
71 are sent in level-one vacuum crystallizer 8；
D, the crystallization of potassium nitrate: the absolute pressure in level-one vacuum crystallizer 8 is controlled in 3KPa~5KPa, and liquidus temperature is
It 30 DEG C~35 DEG C, after concentration magma crystallizes in level-one vacuum crystallizer 8, and is sent in secondary vacuum crystallizer 9, second level is true
In 1KPa~3KPa, liquidus temperature is 20 DEG C~25 DEG C for the absolute pressure control of empty crystallizer 9；
E, the dewatered drying of potassium nitrate: the potassium nitrate crystals in step D are delivered to thickener 10, potassium nitrate crystals are thick
Thick device 10 is concentrated, and the molten slurry after concentration is delivered to centrifuge 11 again and is dehydrated, and liquid phase is sent into potassium nitrate mother liquor tank 14, Gu
Dryer 13 mutually is transported to by screw conveyor 12 to be dried, and finished product potassium nitrate is finally obtained.
Using potassium nitrate product obtained by the present embodiment: potassium oxide content 45.10%, total nitrogen content 14.16%, chloride ion contains
Amount 0.70%, moisture content 0.33% reaches potassium nitrate Grade A standard (reference standard: GB/T 20784-2013 agricultural nitre
Sour potassium).
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of method of flash distillation cooling production potassium nitrate, which is characterized in that follow the steps below:
A, raw material is prepared: solid potassium chloride being launched into potassium chloride dissolving tank (3) and is 25%- as concentration with hot water preparation
30%, ammonium nitrate raw material liquid is delivered in ammonium nitrate solution slot (1) and using steaming by the Klorvess Liquid that 55 DEG C -58 DEG C of temperature
It is 80%-85%, the ammonium nitrate solution that 110 DEG C -120 DEG C of temperature that vapour heating, which is configured to concentration,；
B, metathesis reaction: being that mixing is added in 1:1 by Klorvess Liquid prepared in step A and ammonium nitrate solution in molar ratio
Hybrid reaction is carried out in slot (16), stirring to get temperature is 55 DEG C~60 DEG C mixed solutions；
C, the flash distillation cooling of potassium nitrate solution: the mixed solution of potassium chloride and ammonium nitrate in step B is defeated by feed pump (15)
It is sent in flash vessel (7), the flash vessel (7) includes cylinder (75), and cylinder (75) top and bottom are respectively arranged with upper cover
(76) it is provided with feed pipe (73) with lower head (72), side, middle part is provided with central circulating tube (74), and feed pipe (73) is in
Circulation pipe (74) conducting is entreated, the bottom of lower head (72) is discharge nozzle (71), and the top of upper cover (76) connects steam outlet pipe
(77)；Flash vessel (7) is evacuated by starting vacuum pump (5), and absolute pressure is controlled in 6KPa~9KPa, by potassium chloride and nitric acid
The mixed solution of ammonium is entered in flash vessel (7) by feed pump (15) from feed pipe (73), constantly along central circulating tube (74)
Circulation, the pressure reduction of solution surface, solution boiling point also decrease, and the solution flash distillation close to boiling point generates water vapour, and water steams
Vapour is delivered to surface air cooler (6) from the top of flash vessel (7) by steam outlet pipe (77), and the temperature of steam (vapor) outlet is 40 DEG C~45
DEG C, flash-steam absorbs solution self heat, and solution temperature is made to be down to 40 DEG C~50 DEG C, and potassium nitrate crystals are precipitated, obtain
Potassium nitrate mass fraction is the concentration magma of 25%-30%, is sent to level-one vacuum by the discharge nozzle (71) of flash vessel (7) bottom
In crystallizer (8)；
D, the crystallization of potassium nitrate: the absolute pressure in control level-one vacuum crystallizer (8) is 3KPa~5KPa, liquidus temperature 30
DEG C~35 DEG C, further cone nitric acid potassium crystallization slurry；The potassium nitrate crystal come out from level-one vacuum crystallizer (8) is starched into conveying again
To secondary vacuum crystallizer (9), in 1KPa~3KPa, liquidus temperature is 20 DEG C~25 DEG C for absolute pressure control；
E, the dewatered drying of potassium nitrate: stiff will be delivered to from the potassium nitrate magma that secondary vacuum crystallizer (9) come out in step D
Device (10), potassium nitrate magma are concentrated in thickener (10), and the molten slurry after concentration is delivered to centrifuge (11) again and is dehydrated,
Liquid phase is sent into potassium nitrate mother liquor tank (14), and solid phase is transported to dryer (13) by screw conveyor (12) and is dried, finally obtained
Finished product potassium nitrate.
2. the method for flash distillation cooling production potassium nitrate according to claim 1, it is characterised in that: dissolve solid-state in step A
For the hot water of potassium chloride from high-order hot water storgae (4), hot water temperature is 80 DEG C~90 DEG C.
3. a kind of method of flash distillation cooling production potassium nitrate according to claim 1, it is characterised in that: nitric acid in step A
Ammonium salt solution slot (1) is formed in parallel by 4~8.
4. a kind of method of flash distillation cooling production potassium nitrate according to claim 1, it is characterised in that: dryer (13) is
Air heat drier.
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| CN108083300A (en) * | 2017-12-21 | 2018-05-29 | 山西同杰化学试剂有限公司 | A kind of preparation process for industrializing top pure grade potassium nitrate |
| CN109173324A (en) * | 2018-09-14 | 2019-01-11 | 河北云瑞化工设备有限公司 | A kind of potassium nitrate continuous crystallisation device and method |
| CN109437250B (en) * | 2018-12-13 | 2020-12-11 | 云南欧罗汉姆肥业科技有限公司 | Potassium nitrate and ammonium chloride co-production process |
| CN115594202B (en) * | 2022-09-06 | 2024-05-28 | 湖南化工设计院有限公司 | Separation method for separating potassium nitrate from mixed solution containing potassium nitrate |
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