CN104261437A - Continuous potassium nitrate production system combined with liquid ammonium nitrate production - Google Patents
Continuous potassium nitrate production system combined with liquid ammonium nitrate production Download PDFInfo
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- CN104261437A CN104261437A CN201410530993.3A CN201410530993A CN104261437A CN 104261437 A CN104261437 A CN 104261437A CN 201410530993 A CN201410530993 A CN 201410530993A CN 104261437 A CN104261437 A CN 104261437A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/18—Nitrates of ammonium
- C01C1/185—Preparation
Abstract
The invention relates to a continuous potassium nitrate production system combined with liquid ammonium nitrate production. The system comprises a potassium nitrate production system and a liquid ammonium nitrate production system, wherein the potassium nitrate production system comprises a dissolving tank, a potassium nitrate vacuum crystallization device, a primary thickener, a primary centrifuge, a mixing tank, a concentration preheater, a forced circulation backflow counterflow triple-effect concentrator, a vacuum continuous crystallizer, a secondary thickener and a secondary centrifuge; the liquid ammonium nitrate production system comprises an ammonia evaporator, an ammonia gas filter, an ammonia preheater, a tubular reactor, a neutralization washing tower and a flash drum. A set of continuous potassium nitrate production novel-technology combined with liquid ammonium nitrate production is developed by the invention, so that the production efficiency of the potassium nitrate production technology is improved, the crystallization process is controlled more accurately, and the quality and yield of crystallized potassium nitrate are more stable.
Description
Technical field
The present invention relates to and a kind ofly produce with liquid ammonium nitrate the continous way Production of Potassium Nitrate system combined, belong to chemical production technical field.
Background technology
Domestic preparing potassium nitrate by means of double decomposition mainly adopts SODIUMNITRATE-Repone K method and ammonium nitrate-Repone K method.The former cost of material is higher, and byproduct sodium chloride economic worth is lower.Ammonium nitrate-Repone K metathesis process widespread use, again based on four one-step circulation methods: add water and Repone K in circulating mother liquor, when temperature reduces, potassium nitrate crystal is separated out.In mother liquor, add solid ammonium nitrate, then after evaporation concentration, crystallisation by cooling, separate out ammonia chloride crystal.Mother liquor after separation returns as circulating mother liquor.
At present, domestic existing preparing potassium nitrate by means of double decomposition combined producting ammonium chloride there is no the operating procedure realizing continous way completely, as following two kinds of representational technical process:
Chinese patent literature CN1827526A (application number 200510094223.X) discloses a kind of method of process for preparing potassium nitrate by double decomposition, after raw material Repone K and ammonium nitrate and process water complete preparation with certain proportion, send in vacuum cooling crystallizer, potassium nitrate crystal is separated out and is grown up; Crystal solution is continuously separated out product saltpetre through whizzer again through thickener thickening.Isolated mother liquor through with reaction solution heat exchange after send into natural-circulation evaporator evaporation concentration; Solution after concentrated is continuously separated out ammonium chloride byproduct through whizzer again through cold crystallization, thickener thickening, and gained secondary mother liquid returns Preparation tank.Adopt backward feed during the method evaporating and concentrating process, an effect normal pressure, two effect negative pressure economic benefits and social benefits concentrate, and improve steam utilization, but its two effects temperature is at 125-130 DEG C, and temperature is higher, requires stricter to the erosion resistance of equipment material; And the method concentrates the batch operation mode of rear employing and outer circulation water heat exchange cold crystallization, efficiency is lower.
Chinese patent literature CN101628723A (application number 200910044146.5) discloses the method that replacement(metathesis)reaction generates saltpetre and ammonium chloride, at the temperature of 110 DEG C, by ammonium nitrate and Repone K, be that the ratio of 1:2 is water-soluble in ammonium ion and chlorion, continue to add Repone K and water, heat while stirring, reach the hypersaturated state of saltpetre, stop heating making solution in vacuum cooling crystallizer, be cooled to 36-40 DEG C and separate out potassium nitrate crystals, the whizzer putting into liner filter cloth obtains Temperature, the mother liquor I be separated is saltpetre, another common saturation point of ammonium chloride, finished product saltpetre is obtained by dry after Temperature cold water washing, to mother liquor I with washings, add ammonium nitrate, adjustment strength of solution reaches the state of saturation of ammonium chloride, negative pressure evaporation is carried out in vacuum concentrating apparatus, the centrifugal ammonium chloride leaching precipitation, obtain solid ammonium chloride product.After after primary crystallization is separated by the method, mother liquor mix with ammonium nitrate solid, to adopt and to flow double-effect evaporation concentrated, but it is high to be difficult to overcome two effect material viscosity, coefficient of heat transfer reduction and the problem of the decline of evaporation unit throughput that causes.The method adopts type of cooling decrease temperature crystalline, belongs to batch operation mode, inefficiency.
Ammonium nitrate can be blasted at high temperature, high pressure with under having material that can be oxidized to exist, therefore ammonium nitrate exists certain dangerous when production and application, particularly on September 30th, 2002, the General Office of the State Council has issued the Office of the State Council and has sent out [2002] No. 52 " notices about strengthening industrial explosive materials security control further ", strengthens the management and control to agricultural ammonium nitrate.And be greatly main mainly with interpolation ammonium nitrate solid in existing saltpetre four one-step circulation method, the method that replacement(metathesis)reaction as disclosed in Chinese patent literature CN101628723A (application number 200910044146.5) generates the method for saltpetre and ammonium chloride, the disclosed Production of Potassium Nitrate by Double Decomposition-Circulation Method of Chinese patent literature CN101643226A (application number 200910115875.5) and ammonium chloride be all by potassium nitrate crystal after a mother liquid evaporation concentrated after add ammonium nitrate solid.Ammonium nitrate solid to be added in a mother liquor after potassium nitrate crystal evaporation concentration again by the disclosed method improving solid phase saltpetre concentration and product saltpetre quality of the method for the disclosed a kind of process for preparing potassium nitrate by double decomposition of Chinese patent literature CN101643226A (application number 011108280.1), Chinese patent literature CN101643226A (application number 01106898.1).The method of the disclosed a kind of process for preparing potassium nitrate by double decomposition of Chinese patent literature CN100374372A (application number 200510094223.X), by adding ammonium nitrate liquid in primary crystallization mother liquor, avoids the danger of ammonium nitrate solid in storage, transport, use procedure.But the ammonium nitrate solution concentration used in embodiment is low, cause enormous pressure to subsequent evaporation is concentrated, energy consumption is higher, and the production technique of ammonium nitrate solution unexposed.
Summary of the invention
For the deficiencies in the prior art, the invention provides and a kind ofly produce with liquid ammonium nitrate the continous way Production of Potassium Nitrate system combined, minimizing energy consumption can be reached, realize the continuous prodution that DCS controls, expand Production of Potassium Nitrate scale, improve the object of production safety and efficiency.
Technical scheme of the present invention is as follows:
A kind ofly produce with liquid ammonium nitrate the continous way Production of Potassium Nitrate system combined, comprise Production of Potassium Nitrate system and liquid ammonium nitrate production system, described Production of Potassium Nitrate system comprises dissolving tank, saltpetre vacuum crystallization device, a thickener, whizzer, mixing tank for coating colors, concentrating and preheating device, adverse current triple effect concentrating unit, vacuum continuous crystallizer, secondary thickener and a secondary centrifuging machine, the discharge port of described dissolving tank is connected with the opening for feed of saltpetre vacuum crystallization device, the discharge port of saltpetre vacuum crystallization device is connected with the opening for feed of a thickener, the discharge port of a thickener is connected with the opening for feed of a whizzer, the liquid outlet opening of a whizzer is connected with the opening for feed of mixing tank for coating colors, the discharge port of mixing tank for coating colors is connected with the opening for feed of concentrating and preheating device, the discharge port of concentrating and preheating device is connected with the opening for feed of adverse current triple effect concentrating unit, the discharge port of adverse current triple effect concentrating unit is connected with the opening for feed of vacuum continuous crystallizer, the discharge port of vacuum continuous crystallizer is connected with the opening for feed of secondary thickener, the discharge port of secondary thickener is connected with the opening for feed of secondary centrifuging machine, the liquid outlet opening of secondary centrifuging machine is connected with the opening for feed of dissolving tank,
Described liquid ammonium nitrate production system comprises ammonia evaporator, gas ammonia strainer, ammonia preheater, tubular reactor, in and washing tower and flash drum, described tubular reactor is provided with the first import, second import, first outlet and the second outlet, flash drum is provided with the first opening for feed, second opening for feed and discharge port, the discharge port of ammonia evaporator and the inlet communication of gas ammonia strainer, the outlet of gas ammonia strainer and the inlet communication of ammonia preheater, the outlet of ammonia preheater is communicated with the first opening for feed of tubular reactor, dust technology is passed into tubular reactor by the second opening for feed of tubular reactor, first outlet of tubular reactor with in and the inlet communication of washing tower, in with the outlet of washing tower by be connected with the first opening for feed of flash drum with washing pump, second outlet of tubular reactor is communicated with the second opening for feed of flash drum, the outlet of flash drum is communicated with mixing tank for coating colors in Production of Potassium Nitrate system, flash drum material out finally flows in the mixing tank for coating colors in Production of Potassium Nitrate system,
Described adverse current triple effect concentrating unit is pump circulation adverse current triple effect concentrating unit, comprise an effect pump circulation concentrating unit, two effect pump circulation concentrating uniies, triple effect pump circulation concentrating unit, vacuum system, condenser and concentrating and preheating device, one effect pump circulation concentrating unit comprises an effect well heater, one effect separate chamber, one effect recycle pump and an effect discharging pump, two effect pump circulation concentrating uniies comprise two effect well heaters, two effect separate chambers, two effect recycle pumps and two effect discharging pumps, triple effect pump circulation concentrating unit comprises triple effect well heater, triple effect separate chamber, triple effect cycle pump and triple effect discharging pump, the opening for feed of one effect recycle pump is connected with a bottom of imitating separate chamber, the discharge port of one effect recycle pump imitates well heater respectively bottom and with one is imitated discharging pump and is connected, the discharge port of one effect discharging pump is connected with the opening for feed of vacuum continuous crystallizer, one effect well heater top and an effect bottom, separate chamber are by pipeline communication, and an effect top, separate chamber is imitated well heater top by pipeline and two and is connected,
The opening for feed of two effect recycle pumps is connected with two bottoms of imitating separate chamber, the discharge ports of two effect recycle pumps imitate well heater respectively bottom and two with two is imitated discharging pump and is connected, the discharge port of two effect discharging pumps is connected with a bottom of imitating well heater, two effect well heater tops and two effect bottoms, separate chamber are by pipeline communication, and two effect tops, separate chamber are connected with triple effect well heater top by pipeline;
The opening for feed of triple effect cycle pump is connected with the bottom of triple effect separate chamber, the discharge port of triple effect cycle pump is connected with triple effect discharging pump with the bottom of triple effect well heater respectively, the discharge port of triple effect discharging pump is connected with two bottoms of imitating well heater, triple effect well heater top and bottom, triple effect separate chamber are by pipeline communication, and top, triple effect separate chamber is connected with concentrating and preheating device by pipeline; Concentrating and preheating device is connected with condenser with triple effect well heater bottom by pipeline, and condenser is connected with vacuum system by pipeline.
Described flash drum can be primary flash tank, also can be the series connection of two-stage flash groove.
Described saltpetre vacuum crystallization device is the device of 2 ~ 10 grades of cascaded structures, every one-level cascaded structure comprises crystallizer, condenser, vacuum pump and discharging pump, the upper end of crystallizer is communicated with the upper end of condenser by pipeline, the lower end of condenser is connected with vacuum pump by pipeline, the lower end of condenser is also connected with tank by condensing water conduit, the lower end of crystallizer is connected with discharging pump by pipeline, the discharge port of discharging pump is connected with next stage crystallizer opening for feed, the discharge port of dissolving tank is connected with the opening for feed of the crystallizer of first step cascaded structure, last step discharging pump is connected with the opening for feed of a thickener.Every grade of condenser lower end has condensing water conduit to lead to tank, can be used as cycling use of water and returns Repone K dissolving tank.Material is transferred to N+1 level saltpetre vacuum crystallization device by discharging pump by N (1<N<10) level saltpetre vacuum crystallization device, and last step saltpetre vacuum crystallization device passes through discharging pump pump to thickener.Every grade of condenser lower end has condensing water conduit to lead to tank, can be used as cycling use of water and returns dissolving tank.The temperature in every grade of saltpetre vacuum crystallization device can be controlled, to ensure the Quality and yield of potassium nitrate crystal by the vacuum tightness controlling every grade of saltpetre vacuum crystallization device.
Preferred according to the present invention, described vacuum continuous crystallizer is draft tube baffle crystallizer, OSLO crystallizer.
Preferred according to the present invention, described saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures.
Utilize and above-mentionedly produce with liquid ammonium nitrate the method that the continous way Production of Potassium Nitrate system combined carries out producing saltpetre, step is as follows:
Circulating mother liquor, water and Repone K is added in dissolving tank, steam heating is dissolved, obtained mixing solutions, described circulating mother liquor is ammonium chloride mother liquor, in mixing solutions, the mol ratio of ammonium ion and chlorion is 1:1 ~ 1.2, mixing solutions enters saltpetre vacuum crystallization device, thickener, a whizzer successively, and centrifugation goes out wetting phase potassium nitrate crystal, and wetting phase saltpetre drying, cooling obtain saltpetre;
Liquefied ammonia enters ammonia evaporator and is evaporated to gas ammonia, gas ammonia is after gas ammonia metre filter, then ammonia preheater is entered, gas ammonia enters the dust technology passed into the second opening for feed in tubular reactor and carries out pressurization neutralization reaction after ammonia preheater is heated to 90 ~ 150 DEG C, the reaction solution that reaction generates enters flash drum, reaction heat is utilized to carry out flash distillation concentrate, obtained ammonium nitrate solution;
After obtained ammonium nitrate solution mixes in tempering tank with the saltpetre mother liquor that centrifugation goes out, feed liquid enters pump circulation adverse current triple effect concentrating unit after the preheating of concentrating and preheating device, and being concentrated into density is 1.30 ~ 1.37g/cm
3after, send into the crystallization of vacuum continuous crystallizer, more successively through secondary thickener, secondary centrifuging machine, through centrifugation ammonia chloride crystal, be separated the ammonium chloride mother liquor obtained and add recycle in dissolving tank.
Preferred according to the present invention, the Heating temperature that in dissolving tank, steam heating is dissolved is 65 ~ 90 DEG C.
Preferred according to the present invention, described saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures; Wherein, in first degree crystalline device, temperature controls at 65 ~ 80 DEG C, and vacuum tightness is 0.020 ~ 0.040MPa; In secondary crystallizer, temperature controls at 50 ~ 65 DEG C, and vacuum tightness is 0.012 ~ 0.020MPa; In three grades of crystallizers, temperature controls at 42 ~ 50 DEG C, and vacuum tightness is 0.005 ~ 0.012MPa; In level Four crystallizer, temperature controls at 35 ~ 42 DEG C, and vacuum tightness is 0.003 ~ 0.005MPa; In Pyatyi crystallizer, temperature controls at 25 ~ 35 DEG C, and vacuum tightness is 0.0020 ~ 0.003MPa; In six grades of crystallizers, temperature controls at 15 ~ 25 DEG C, and vacuum tightness is 0.0010 ~ 0.0020MPa.
Preferred according to the present invention, passing into dust technology mass concentration in tubular reactor is 40 ~ 60wt%, and the reaction pressure of tubular reactor is 0.2 ~ 0.6MPa, and temperature of reaction relies on exothermic heat of reaction to provide, and the concentration of flash liquid, is controlled by the temperature of secondary steam.
Preferred according to the present invention, the described ammonium nitrate solution mass concentration obtained from flash drum concentrate is 75% ~ 95wt%.
Preferred according to the present invention, with washing tower dust technology or ammonia stripping during the process steam containing ammonia or nitric acid that gas ammonia and dust technology neutralization reaction in tubular reactor is discharged enters, the dust technology ammonium solution obtained after washing by and washing pump pump into flash drum, process steam can be used as the thermal source of flash vaporization or supplies outward.
Preferred according to the present invention, in an effect pump circulation concentrating unit in described pump circulation adverse current triple effect concentrating unit, temperature is 110 ~ 115 DEG C, vacuum tightness is 0.18 ~ 0.25MPa, in two effect pump circulation concentrating uniies, temperature is 90 ~ 100 DEG C, vacuum tightness is 0.08 ~ 0.10MPa, in triple effect pump circulation concentrating unit, temperature is 60 ~ 80 DEG C, and vacuum tightness is 0.01 ~ 0.05MPa.
Preferred according to the present invention, in described vacuum continuous crystallizer, temperature is 50 ~ 70 DEG C, and vacuum tightness is 0.07 ~ 0.10MPa.
Preferred according to the present invention, this technique realizes Automated condtrol by installing DCS system.
Produce a method for the continous way saltpetre combined with liquid ammonium nitrate, step is as follows:
(1) ammonium chloride mother liquor, water and Repone K are mixed, be steam heated to 65 ~ 90 DEG C of dissolvings, obtained mixing solutions, in mixing solutions, the mol ratio of ammonium ion and chlorion is 1:1 ~ 1.2,
(2) mixing solutions that step (1) is obtained is carried out six grades of vacuum crystallizations, the temperature of one-level vacuum cyrsytalliser 65 ~ 80 DEG C, vacuum tightness is 0.020 ~ 0.040MPa, the temperature of secondary vacuum crystallizer is 50 ~ 65 DEG C, vacuum tightness is 0.012 ~ 0.020MPa, the temperature of three grades of vacuum cyrsytallisers is 42 ~ 50 DEG C, vacuum tightness is 0.005 ~ 0.012MPa, the temperature of level Four vacuum cyrsytalliser is 35 ~ 42 DEG C, vacuum tightness is 0.003 ~ 0.005MPa, the temperature of Pyatyi vacuum cyrsytalliser is 25 ~ 35 DEG C, vacuum tightness is 0.0020 ~ 0.0030MPa, the temperature of six grades of vacuum cyrsytallisers is 15 ~ 25 DEG C, vacuum tightness is 0.0010 ~ 0.0020MPa,
(3) material after step (2) vacuum crystallization is entered a thickener, make the water content control of thickener out material 40 ~ 50%, then once centrifugal, obtained potassium nitrate crystal and saltpetre mother liquor;
(4) liquefied ammonia is evaporated to gas ammonia after being heated to 5 ~ 15 DEG C, after gas ammonia filters, then enter after ammonia preheater is heated to 90 ~ 150 DEG C in tubular reactor and carry out pressurization neutralization reaction with dust technology, the molar ratio controlling gas ammonia and nitric acid is 0.8 ~ 1.2: 1.The reaction solution flash distillation concentrate that reaction generates, obtained mass concentration is the ammonium nitrate solution of 75%-95wt%;
(5) after saltpetre mother liquor obtained with step (3) for obtained for step (4) ammonium nitrate solution being mixed in tempering tank, ammonium nitrate solution and saltpetre mother liquor ratio are (5 ~ 10): 1, concentrate through pump circulation adverse current triple effect, triple effect thickening temperature is 70 ~ 80 DEG C, two effect thickening temperatures are 90 ~ 100 DEG C, one effect thickening temperature is 110 ~ 115 DEG C, and being concentrated into density is 1.30 ~ 1.37g/cm
3water content 50 ~ 80%, it is 50 ~ 70 DEG C in temperature, vacuum tightness is crystallization under the condition of 0.07 ~ 0.10MPa, then enter secondary thickener, make the moisture mass content of thickener out material control 30 ~ 45%, then secondary centrifuging, obtained ammonia chloride crystal and ammonium chloride mother liquor, the reaction cycle that ammonium chloride mother liquor participates in step (1) utilizes.
Be not particularly illustrated in above preparation method all conventionally.
The present invention has the following advantages and beneficial effect:
1, this invention exploits and a set ofly produce with liquid ammonium nitrate the continous way Production of Potassium Nitrate novel process combined, improve the production efficiency of process for producing potassium nitrate, avoid raw material ammonium nitrate to buy, transport, danger in storage, greatly reduce production cost.
2, the present invention adopts brand-new saltpetre vacuum crystallization design, and control more accurate to crystallisation process, the Quality and yield of potassium nitrate crystal is more stable.
3, adopt flash process to produce ammonium nitrate solution, avoid the explosion hazard that conventional production plant causes, and the concentration of ammonium nitrate solution of producing is high, little to subsequent concentration operation pressure, the residence time is short, little to equipment corrosion, capable of reducing energy consumption.
4, the present invention adopts adverse current triple effect concentration technology to concentrate chloride slip, not only reduces thickening temperature, alleviates the corrosion of slip to equipment, also greatly saved steam usage quantity, reduced energy consumption.
5, adverse current triple effect concentration technology of the present invention adopts pump circulation to concentrate, and by controlling higher velocity in pipes, reduces scale formation in interchanger.
6, vacuum continuous crystallizer is applied in the crystallisation process of ammonium chloride by the present invention, and more traditional heat exchange type of cooling is compared, and achieves operate continuously, saves the production time, raises the efficiency.
Accompanying drawing illustrates:
Fig. 1 is the process flow diagram of continous way double decomposition Production of Potassium Nitrate of the present invention;
Fig. 2 is saltpetre vacuum crystallization device schematic diagram of the present invention;
Wherein: A, crystallizer, B, condenser, C, vacuum pump, D, discharging pump;
Fig. 3 is pump circulation adverse current triple effect concentrating unit of the present invention, vacuum continuous crystallisation device schematic diagram;
Wherein: 1, vacuum system, 2, triple effect separate chamber, 3, triple effect well heater, 4, two effect separate chambers, 5, two effect well heaters, 6, one effect separate chamber, 7, an effect well heater, 8, triple effect cycle pump, 9, triple effect discharging pump, 10, two effect recycle pumps, 11, two effect discharging pumps, 12, one effect recycle pump, 13, an effect discharging pump, 14, condenser, 15, concentrating and preheating device, 16, vacuum continuous crystallizer.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is described further, but scope of the present invention is not limited thereto.
The raw material used in embodiment is common commercially available.
Embodiment 1
A kind ofly produce with liquid ammonium nitrate the continous way Production of Potassium Nitrate system combined, comprise Production of Potassium Nitrate system and liquid ammonium nitrate production system, described Production of Potassium Nitrate system comprises dissolving tank, saltpetre vacuum crystallization device, a thickener, whizzer, mixing tank for coating colors, concentrating and preheating device, adverse current triple effect concentrating unit, vacuum continuous crystallizer, secondary thickener and a secondary centrifuging machine, the discharge port of described dissolving tank is connected with the opening for feed of saltpetre vacuum crystallization device, the discharge port of saltpetre vacuum crystallization device is connected with the opening for feed of a thickener, the discharge port of a thickener is connected with the opening for feed of a whizzer, the liquid outlet opening of a whizzer is connected with the opening for feed of mixing tank for coating colors, the discharge port of mixing tank for coating colors is connected with the opening for feed of concentrating and preheating device, the discharge port of concentrating and preheating device is connected with the opening for feed of adverse current triple effect concentrating unit, the discharge port of adverse current triple effect concentrating unit is connected with the opening for feed of vacuum continuous crystallizer, the discharge port of vacuum continuous crystallizer is connected with the opening for feed of secondary thickener, the discharge port of secondary thickener is connected with the opening for feed of secondary centrifuging machine, the liquid outlet opening of secondary centrifuging machine is connected with the opening for feed of dissolving tank, saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures, every one-level cascaded structure comprises crystallizer A, condenser B, vacuum pump C and discharging pump D, the upper end of crystallizer A is communicated with by the upper end of pipeline with condenser B, the lower end of condenser B is connected with vacuum pump C by pipeline, the lower end of condenser B is also connected with tank by condensing water conduit, the lower end of crystallizer A is connected with discharging pump D by pipeline, the discharge port of discharging pump D is connected with next stage crystallizer opening for feed, the discharge port of dissolving tank is connected with the opening for feed of the crystallizer of first step cascaded structure, last step discharging pump is connected with the opening for feed of a thickener.Every grade of condenser lower end has condensing water conduit to lead to tank, can be used as cycling use of water and returns Repone K dissolving tank.Material is transferred to N+1 level saltpetre vacuum crystallization device by discharging pump by N (1<N<10) level saltpetre vacuum crystallization device, and last step saltpetre vacuum crystallization device passes through discharging pump pump to thickener.Every grade of condenser lower end has condensing water conduit to lead to tank, can be used as cycling use of water and returns dissolving tank.The temperature in every grade of saltpetre vacuum crystallization device can be controlled, to ensure the Quality and yield of potassium nitrate crystal by the vacuum tightness controlling every grade of saltpetre vacuum crystallization device.
Adverse current triple effect concentrating unit is pump circulation adverse current triple effect concentrating unit, comprise an effect pump circulation concentrating unit, two effect pump circulation concentrating uniies, triple effect pump circulation concentrating unit, vacuum system 1, condenser 14 and concentrating and preheating device 15, one effect pump circulation concentrating unit comprises an effect well heater 7, one effect separate chamber 6, one effect recycle pump 12 and an effect discharging pump 13, two effect pump circulation concentrating uniies comprise two effect well heaters 5, two effect separate chambers 4, two effect recycle pump 10 and two effect discharging pumps 11, triple effect pump circulation concentrating unit comprises triple effect well heater 3, triple effect separate chamber 2, triple effect cycle pump 8 and triple effect discharging pump 9, the opening for feed of one effect recycle pump 12 is connected with a bottom of imitating separate chamber 6, the discharge port of one effect recycle pump 12 imitates well heater 7 respectively bottom and with one is imitated discharging pump 13 and is connected, the discharge port of one effect discharging pump 13 is connected with the opening for feed of vacuum continuous crystallizer, one effect well heater 7 top and an effect bottom, separate chamber 6 are by pipeline communication, and an effect top, separate chamber 6 is imitated well heater 5 top by pipeline and two and is connected,
The opening for feed of two effect recycle pumps 10 is connected with two bottoms of imitating separate chamber 4, the discharge ports of two effect recycle pumps 10 imitate well heater 5 respectively bottom and two with two is imitated discharging pump 11 and is connected, the discharge port of two effect discharging pumps 11 is connected with a bottom of imitating well heater 7, two effect well heater 5 tops and two effect bottoms, separate chamber 4 are by pipeline communication, and two effect tops, separate chamber 4 are connected with triple effect well heater 3 top by pipeline;
The opening for feed of triple effect cycle pump 8 is connected with the bottom of triple effect separate chamber 2, the discharge port of triple effect cycle pump 8 is connected with triple effect discharging pump 9 with the bottom of triple effect well heater 3 respectively, the discharge port of triple effect discharging pump 9 is connected with two bottoms of imitating well heater 5, triple effect well heater 3 top and bottom, triple effect separate chamber 2 are by pipeline communication, and top, triple effect separate chamber 2 is connected by the steam-in of pipeline with concentrating and preheating device 15; Concentrating and preheating device 15 is connected with condenser 14 with triple effect well heater 3 bottom by pipeline, and condenser 14 is connected with vacuum system 1 by pipeline.
Described liquid ammonium nitrate production system comprises ammonia evaporator, gas ammonia strainer, ammonia preheater, tubular reactor, in and washing tower and flash drum, described tubular reactor is provided with the first import, second import, first outlet and the second outlet, flash drum is provided with the first opening for feed, second opening for feed and discharge port, the discharge port of ammonia evaporator and the inlet communication of gas ammonia strainer, the outlet of gas ammonia strainer and the inlet communication of ammonia preheater, the outlet of ammonia preheater is communicated with the first opening for feed of tubular reactor, dust technology is passed into tubular reactor by the second opening for feed of tubular reactor, first outlet of tubular reactor with in and the inlet communication of washing tower, in with the outlet of washing tower by washing pump and flash drum the first opening for feed be connected, second outlet of tubular reactor is communicated with the second opening for feed of flash drum, the outlet of flash drum is communicated with mixing tank for coating colors in Production of Potassium Nitrate system, flash drum material out finally flows in the mixing tank for coating colors in Production of Potassium Nitrate system.
Described vacuum continuous crystallizer is draft tube baffle crystallizer, OSLO crystallizer.
Embodiment 2
Utilize the method for producing the continous way Production of Potassium Nitrate system continuous seepage saltpetre combined described in embodiment 1 with liquid ammonium nitrate, step is as follows:
(1) in dissolving tank, add circulating mother liquor, water and Repone K, mix, be steam heated to 75 DEG C of dissolvings, obtained mixing solutions, described circulating mother liquor is ammonium chloride mother liquor, and in mixing solutions, the mol ratio of ammonium ion and chlorion is 1:1,
(2) mixing solutions enters saltpetre vacuum crystallization device successively, and saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures; The temperature 70 C of one-level vacuum cyrsytalliser, vacuum tightness is 0.035MPa, and the temperature of secondary vacuum crystallizer is 55 DEG C, and vacuum tightness is 0.018MPa, the temperature of three grades of vacuum cyrsytallisers is 42 DEG C, vacuum tightness is 0.010MPa, and the temperature of level Four vacuum cyrsytalliser is 35 DEG C, and vacuum tightness is 0.003MPa, the temperature of Pyatyi vacuum cyrsytalliser is 25 DEG C, vacuum tightness is 0.003MPa, and the temperature of six grades of vacuum cyrsytallisers is 15 DEG C, and vacuum tightness is 0.001MPa;
(3) material after step (2) vacuum crystallization is entered a thickener, the moisture mass content of thickener out material is made to control 40%, then through a whizzer, centrifugation goes out wetting phase potassium nitrate crystal, wetting phase saltpetre drying, cooling obtain saltpetre, and the saltpetre mother liquor that centrifugation goes out enters mixing tank for coating colors;
(4) liquefied ammonia enters ammonia evaporator and is heated to 10 DEG C and is evaporated to gas ammonia, gas ammonia is after gas ammonia metre filter, then ammonia preheater is entered, gas ammonia enters mass concentration 65% dust technology passed into the second opening for feed in tubular reactor and carries out pressurization neutralization reaction after ammonia preheater is heated to 90 DEG C, the mol ratio controlling ammonia and nitric acid is 1:1, the reaction solution that reaction generates enters flash drum, utilizes reaction heat to carry out flash distillation concentrate, obtains the ammonium nitrate solution that mass concentration is 80wt%; Wash with washing tower dust technology during the ammonia of discharging in tubular reactor enters, the ammonium nitrate solution obtained after washing enters flash drum.The technique steam of flash drum is condensed into process condensate water cycle through vaporizer-condenser and uses.
(5) be after the ammonium nitrate solution of 80wt% mixes in mixing tank for coating colors with the saltpetre mother liquor that step (3) obtains by mass concentration obtained for step (4), the mass ratio of ammonium nitrate solution and saltpetre mother liquor is 5:1, feed liquid enters pump circulation adverse current triple effect concentrating unit after the preheating of concentrating and preheating device, and being concentrated into density is 1.35g/cm
3after, controlling temperature in an effect pump circulation concentrating unit is 110 DEG C, and in two effect pump circulation concentrating uniies, temperature is 90 DEG C, and in triple effect pump circulation concentrating unit, temperature is 75 DEG C, then the crystallization of DTB vacuum continuous crystallizer is sent into, Tc 60 DEG C, vacuum tightness is 0.10MPa, then through secondary thickener, make the water content control of thickener out material 40%, then secondary centrifuging machine, through centrifugation ammonia chloride crystal, is separated the ammonium chloride mother liquor obtained and adds recycle in dissolving tank.Gained potassium nitrate product K
2o:44.0wt%, Cl
-: 1.6wt%, ammonium chloride product total nitrogen content is 25.3wt%.
Embodiment 3
Utilize the method for producing the continous way Production of Potassium Nitrate system continuous seepage saltpetre combined described in embodiment 1 with liquid ammonium nitrate, step is as follows:
(1) in dissolving tank, add circulating mother liquor, water and Repone K, mix, be steam heated to 80 DEG C of dissolvings, obtained mixing solutions, described circulating mother liquor is ammonium chloride mother liquor, and in mixing solutions, the mol ratio of ammonium ion and chlorion is 1:1.1,
(2) mixing solutions enters saltpetre vacuum crystallization device successively, and saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures; The temperature of one-level vacuum cyrsytalliser 75 DEG C, vacuum tightness is 0.030MPa, and the temperature of secondary vacuum crystallizer is 60 DEG C, and vacuum tightness is 0.015MPa, the temperature of three grades of vacuum cyrsytallisers is 45 DEG C, vacuum tightness is 0.008MPa, and the temperature of level Four vacuum cyrsytalliser is 38 DEG C, and vacuum tightness is 0.004MPa, the temperature of Pyatyi vacuum cyrsytalliser is 30 DEG C, vacuum tightness is 0.0028MPa, and the temperature of six grades of vacuum cyrsytallisers is 20 DEG C, and vacuum tightness is 0.0013MPa;
(3) material after step (2) vacuum crystallization is entered a thickener, the moisture mass content of thickener out material is made to control 50%, then through a whizzer, centrifugation goes out wetting phase potassium nitrate crystal, wetting phase saltpetre drying, cooling obtain saltpetre, and the saltpetre mother liquor that centrifugation goes out enters mixing tank for coating colors;
(4) liquefied ammonia enters ammonia evaporator and is heated to 15 DEG C and is evaporated to gas ammonia, gas ammonia is after gas ammonia metre filter, then ammonia preheater is entered, gas ammonia enters mass concentration 40% dust technology passed into the second opening for feed in tubular reactor and carries out pressurization neutralization reaction after ammonia preheater is heated to 100 DEG C, the mol ratio controlling ammonia and nitric acid is 0.9:1, the reaction solution that reaction generates enters flash drum, utilizes reaction heat to carry out flash distillation concentrate, obtains the ammonium nitrate solution that mass concentration is 78wt%; Wash with washing tower dust technology during the ammonia of discharging in tubular reactor enters, the ammonium nitrate solution obtained after washing enters flash drum.The technique steam of flash drum is condensed into process condensate water cycle through vaporizer-condenser and uses.
(5) be after the ammonium nitrate solution of 78wt% mixes in mixing tank for coating colors with the saltpetre mother liquor that step (3) obtains by mass concentration obtained for step (4), the mass ratio of ammonium nitrate solution and saltpetre mother liquor is 9:1, feed liquid enters pump circulation adverse current triple effect concentrating unit after the preheating of concentrating and preheating device, and being concentrated into density is 1.35g/cm
3, water content is 65%, controlling temperature in an effect pump circulation concentrating unit is 115 DEG C, in two effect pump circulation concentrating uniies, temperature is 95 DEG C, in triple effect pump circulation concentrating unit, temperature is 80 DEG C, then the crystallization of OSLO vacuum continuous crystallizer is sent into, Tc 70 DEG C, vacuum tightness is 0.075MPa, again through secondary thickener, make the water content control of thickener out material 35%, then secondary centrifuging machine, through centrifugation ammonia chloride crystal, is separated the ammonium chloride mother liquor obtained and adds recycle in dissolving tank.
Gained potassium nitrate product K
2o:44.2wt%, Cl
-: 0.9wt%, ammonium chloride product total nitrogen content is 25.6wt%.
Embodiment 4
Utilize the method for producing the continous way Production of Potassium Nitrate system continuous seepage saltpetre combined described in embodiment 1 with liquid ammonium nitrate, step is as follows:
(1) in dissolving tank, add circulating mother liquor, water and Repone K, mix, be steam heated to 90 DEG C of dissolvings, obtained mixing solutions, described circulating mother liquor is ammonium chloride mother liquor, and in mixing solutions, the mol ratio of ammonium ion and chlorion is 1:1.2,
(2) mixing solutions enters saltpetre vacuum crystallization device successively, and saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures; The temperature of one-level vacuum cyrsytalliser 80 DEG C, vacuum tightness is 0.020MPa, and the temperature of secondary vacuum crystallizer is 65 DEG C, and vacuum tightness is 0.012MPa, the temperature of three grades of vacuum cyrsytallisers is 50 DEG C, vacuum tightness is 0.007MPa, and the temperature of level Four vacuum cyrsytalliser is 42 DEG C, and vacuum tightness is 0.005MPa, the temperature of Pyatyi vacuum cyrsytalliser is 35 DEG C, vacuum tightness is 0.003MPa, and the temperature of six grades of vacuum cyrsytallisers is 25 DEG C, and vacuum tightness is 0.0020MPa;
(3) material after step (2) vacuum crystallization is entered a thickener, the moisture mass content of thickener out material is made to control 45%, then through a whizzer, centrifugation goes out wetting phase potassium nitrate crystal, wetting phase saltpetre drying, cooling obtain saltpetre, and the saltpetre mother liquor that centrifugation goes out enters mixing tank for coating colors;
(4) liquefied ammonia enters ammonia evaporator and is heated to 15 DEG C and is evaporated to gas ammonia, gas ammonia is after gas ammonia metre filter, then ammonia preheater is entered, gas ammonia enters mass concentration 56% dust technology passed into the second opening for feed in tubular reactor and carries out pressurization neutralization reaction after ammonia preheater is heated to 100 DEG C, the mol ratio controlling ammonia and nitric acid is 1.1:1, the reaction solution that reaction generates enters flash drum, utilizes reaction heat to carry out flash distillation concentrate, obtains the ammonium nitrate solution that mass concentration is 95wt%; Wash with washing tower dust technology during the ammonia of discharging in tubular reactor enters, the ammonium nitrate solution obtained after washing enters flash drum.The technique steam of flash drum is condensed into process condensate water cycle through vaporizer-condenser and uses.
(5) be after the ammonium nitrate solution of 95wt% mixes in mixing tank for coating colors with the saltpetre mother liquor that step (3) obtains by mass concentration obtained for step (4), the mass ratio of ammonium nitrate solution and saltpetre mother liquor is 8:1, feed liquid enters pump circulation adverse current triple effect concentrating unit after the preheating of concentrating and preheating device, and being concentrated into density is 1.36g/cm
3, water content is 60%, controlling temperature in an effect pump circulation concentrating unit is 115 DEG C, in two effect pump circulation concentrating uniies, temperature is 100 DEG C, in triple effect pump circulation concentrating unit, temperature is 80 DEG C, then the crystallization of OSLO vacuum continuous crystallizer is sent into, Tc 70 DEG C, vacuum tightness is 0.08MPa, again through secondary thickener, make the water content control of thickener out material 35%, then secondary centrifuging machine, through centrifugation ammonia chloride crystal, is separated the ammonium chloride mother liquor obtained and adds recycle in dissolving tank.
Gained potassium nitrate product K
2o:44.9wt%, Cl
-: 0.6wt%, ammonium chloride product total nitrogen content is 25.1%.
Embodiment 5
Utilize the method for producing the continous way Production of Potassium Nitrate system continuous seepage saltpetre combined described in embodiment 1 with liquid ammonium nitrate, step is as follows:
(1) in dissolving tank, add circulating mother liquor, water and Repone K, mix, be steam heated to 65 DEG C of dissolvings, obtained mixing solutions, described circulating mother liquor is ammonium chloride mother liquor, and in mixing solutions, the mol ratio of ammonium ion and chlorion is 1:1,
(2) mixing solutions enters saltpetre vacuum crystallization device successively, and saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures; The temperature 60 C of one-level vacuum cyrsytalliser, vacuum tightness is 0.040MPa, and the temperature of secondary vacuum crystallizer is 55 DEG C, and vacuum tightness is 0.019MPa, the temperature of three grades of vacuum cyrsytallisers is 45 DEG C, vacuum tightness is 0.011MPa, and the temperature of level Four vacuum cyrsytalliser is 40 DEG C, and vacuum tightness is 0.0045MPa, the temperature of Pyatyi vacuum cyrsytalliser is 30 DEG C, vacuum tightness is 0.0028MPa, and the temperature of six grades of vacuum cyrsytallisers is 20 DEG C, and vacuum tightness is 0.0012MPa;
(3) material after step (2) vacuum crystallization is entered a thickener, the moisture mass content of thickener out material is made to control 45%, then through a whizzer, centrifugation goes out wetting phase potassium nitrate crystal, wetting phase saltpetre drying, cooling obtain saltpetre, and the saltpetre mother liquor that centrifugation goes out enters mixing tank for coating colors;
(4) liquefied ammonia enters ammonia evaporator and is heated to 20 DEG C and is evaporated to gas ammonia, gas ammonia is after gas ammonia metre filter, then ammonia preheater is entered, gas ammonia enters mass concentration 56% dust technology passed into the second opening for feed in tubular reactor and carries out pressurization neutralization reaction after ammonia preheater is heated to 150 DEG C, the mol ratio controlling ammonia and nitric acid is 0.8:1, the reaction solution that reaction generates enters flash drum, utilizes reaction heat to carry out flash distillation concentrate, obtains the ammonium nitrate solution that mass concentration is 85wt%; Wash with washing tower dust technology during the ammonia of discharging in tubular reactor enters, the ammonium nitrate solution obtained after washing enters flash drum.The technique steam of flash drum is condensed into process condensate water cycle through vaporizer-condenser and uses.
(5) be after the ammonium nitrate solution of 85wt% mixes in mixing tank for coating colors with the saltpetre mother liquor that step (3) obtains by mass concentration obtained for step (4), the mass ratio of ammonium nitrate solution and saltpetre mother liquor is 9:1, feed liquid enters pump circulation adverse current triple effect concentrating unit after the preheating of concentrating and preheating device, and being concentrated into density is 1.37g/cm
3, water content is 60%, controlling temperature in an effect pump circulation concentrating unit is 110 DEG C, in two effect pump circulation concentrating uniies, temperature is 90 DEG C, in triple effect pump circulation concentrating unit, temperature is 70 DEG C, then the crystallization of OSLO vacuum continuous crystallizer is sent into, Tc 65 DEG C, vacuum tightness is 0.09MPa, again through secondary thickener, make the water content control of thickener out material 40%, then secondary centrifuging machine, through centrifugation ammonia chloride crystal, is separated the ammonium chloride mother liquor obtained and adds recycle in dissolving tank.
Gained potassium nitrate product K
2o:44.5wt%, Cl
-: 1.1wt%, ammonium chloride product total nitrogen content is 25.5wt%
Embodiment 6
Utilize the method for producing the continous way Production of Potassium Nitrate system continuous seepage saltpetre combined described in embodiment 1 with liquid ammonium nitrate, step is as follows:
(1) in dissolving tank, add circulating mother liquor, water and Repone K, mix, be steam heated to 70 DEG C of dissolvings, obtained mixing solutions, described circulating mother liquor is ammonium chloride mother liquor, and in mixing solutions, the mol ratio of ammonium ion and chlorion is 1:1.1,
(2) mixing solutions enters saltpetre vacuum crystallization device successively, and saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures; The temperature of one-level vacuum cyrsytalliser 65 DEG C, vacuum tightness is 0.038MPa, and the temperature of secondary vacuum crystallizer is 55 DEG C, and vacuum tightness is 0.018MPa, the temperature of three grades of vacuum cyrsytallisers is 42 DEG C, vacuum tightness is 0.010MPa, and the temperature of level Four vacuum cyrsytalliser is 38 DEG C, and vacuum tightness is 0.004MPa, the temperature of Pyatyi vacuum cyrsytalliser is 30 DEG C, vacuum tightness is 0.0025MPa, and the temperature of six grades of vacuum cyrsytallisers is 23 DEG C, and vacuum tightness is 0.0018MPa;
(3) material after step (2) vacuum crystallization is entered a thickener, the moisture mass content of thickener out material is made to control 70%, then through a whizzer, centrifugation goes out wetting phase potassium nitrate crystal, wetting phase saltpetre drying, cooling obtain saltpetre, and the saltpetre mother liquor that centrifugation goes out enters mixing tank for coating colors;
(4) liquefied ammonia enters ammonia evaporator and is heated to 8 DEG C and is evaporated to gas ammonia, gas ammonia is after gas ammonia metre filter, then ammonia preheater is entered, gas ammonia enters mass concentration 56% dust technology passed into the second opening for feed in tubular reactor and carries out pressurization neutralization reaction after ammonia preheater is heated to 130 DEG C, the mol ratio controlling ammonia and nitric acid is 1.2:1, the reaction solution that reaction generates enters flash drum, utilizes reaction heat to carry out flash distillation concentrate, obtains the ammonium nitrate solution that mass concentration is 90wt%; Wash with washing tower dust technology during the ammonia of discharging in tubular reactor enters, the ammonium nitrate solution obtained after washing enters flash drum.The technique steam of flash drum is condensed into process condensate water cycle through vaporizer-condenser and uses.
(5) be after the ammonium nitrate solution of 90wt% mixes in mixing tank for coating colors with the saltpetre mother liquor that step (3) obtains by mass concentration obtained for step (4), the mass ratio of ammonium nitrate solution and saltpetre mother liquor is 10:1, feed liquid enters pump circulation adverse current triple effect concentrating unit after the preheating of concentrating and preheating device, and being concentrated into density is 1.30g/cm
3, water content is 80%, controlling temperature in an effect pump circulation concentrating unit is 115 DEG C, in two effect pump circulation concentrating uniies, temperature is 90 DEG C, in triple effect pump circulation concentrating unit, temperature is 70 DEG C, then the crystallization of OSLO vacuum continuous crystallizer is sent into, Tc 55 DEG C, vacuum tightness is 0.09MPa, again through secondary thickener, make the water content control of thickener out material 32%, then secondary centrifuging machine, through centrifugation ammonia chloride crystal, is separated the ammonium chloride mother liquor obtained and adds recycle in dissolving tank.
Gained potassium nitrate product K
2o:44.7wt%, Cl
-: 0.5wt%, ammonium chloride product total nitrogen content is 25.3wt%.
Claims (10)
1. produce with liquid ammonium nitrate the continous way Production of Potassium Nitrate system combined for one kind, comprise Production of Potassium Nitrate system and liquid ammonium nitrate production system, described Production of Potassium Nitrate system comprises dissolving tank, saltpetre vacuum crystallization device, a thickener, whizzer, mixing tank for coating colors, concentrating and preheating device, adverse current triple effect concentrating unit, vacuum continuous crystallizer, secondary thickener and a secondary centrifuging machine, the discharge port of described dissolving tank is connected with the opening for feed of saltpetre vacuum crystallization device, the discharge port of saltpetre vacuum crystallization device is connected with the opening for feed of a thickener, the discharge port of a thickener is connected with the opening for feed of a whizzer, the liquid outlet opening of a whizzer is connected with the opening for feed of mixing tank for coating colors, the discharge port of mixing tank for coating colors is connected with the opening for feed of concentrating and preheating device, the discharge port of concentrating and preheating device is connected with the opening for feed of adverse current triple effect concentrating unit, the discharge port of adverse current triple effect concentrating unit is connected with the opening for feed of vacuum continuous crystallizer, the discharge port of vacuum continuous crystallizer is connected with the opening for feed of secondary thickener, the discharge port of secondary thickener is connected with the opening for feed of secondary centrifuging machine, the liquid outlet opening of secondary centrifuging machine is connected with the opening for feed of dissolving tank,
Described liquid ammonium nitrate production system comprises ammonia evaporator, gas ammonia strainer, ammonia preheater, tubular reactor, in and washing tower and flash drum, described tubular reactor is provided with the first import, second import, first outlet and the second outlet, flash drum is provided with the first opening for feed, second opening for feed and discharge port, the discharge port of ammonia evaporator and the inlet communication of gas ammonia strainer, the outlet of gas ammonia strainer and the inlet communication of ammonia preheater, the outlet of ammonia preheater is communicated with the first opening for feed of tubular reactor, dust technology is passed into tubular reactor by the second opening for feed of tubular reactor, first outlet of tubular reactor with in and the inlet communication of washing tower, in with the outlet of washing tower by be connected with the first opening for feed of flash drum with washing pump, second outlet of tubular reactor is communicated with the second opening for feed of flash drum, the outlet of flash drum is communicated with mixing tank for coating colors in Production of Potassium Nitrate system, flash drum material out finally flows in the mixing tank for coating colors in Production of Potassium Nitrate system,
Described adverse current triple effect concentrating unit is pump circulation adverse current triple effect concentrating unit, comprise an effect pump circulation concentrating unit, two effect pump circulation concentrating uniies, triple effect pump circulation concentrating unit, vacuum system, condenser and concentrating and preheating device, one effect pump circulation concentrating unit comprises an effect well heater, one effect separate chamber, one effect recycle pump and an effect discharging pump, two effect pump circulation concentrating uniies comprise two effect well heaters, two effect separate chambers, two effect recycle pumps and two effect discharging pumps, triple effect pump circulation concentrating unit comprises triple effect well heater, triple effect separate chamber, triple effect cycle pump and triple effect discharging pump, the opening for feed of one effect recycle pump is connected with a bottom of imitating separate chamber, the discharge port of one effect recycle pump imitates well heater respectively bottom and with one is imitated discharging pump and is connected, the discharge port of one effect discharging pump is connected with the opening for feed of vacuum continuous crystallizer, one effect well heater top and an effect bottom, separate chamber are by pipeline communication, and an effect top, separate chamber is imitated well heater top by pipeline and two and is connected,
The opening for feed of two effect recycle pumps is connected with two bottoms of imitating separate chamber, the discharge ports of two effect recycle pumps imitate well heater respectively bottom and two with two is imitated discharging pump and is connected, the discharge port of two effect discharging pumps is connected with a bottom of imitating well heater, two effect well heater tops and two effect bottoms, separate chamber are by pipeline communication, and two effect tops, separate chamber are connected with triple effect well heater top by pipeline;
The opening for feed of triple effect cycle pump is connected with the bottom of triple effect separate chamber, the discharge port of triple effect cycle pump is connected with triple effect discharging pump with the bottom of triple effect well heater respectively, the discharge port of triple effect discharging pump is connected with two bottoms of imitating well heater, triple effect well heater top and bottom, triple effect separate chamber are by pipeline communication, and top, triple effect separate chamber is connected with concentrating and preheating device by pipeline; Concentrating and preheating device is connected with condenser with triple effect well heater bottom by pipeline, and condenser is connected with vacuum system by pipeline.
2. according to claim 1ly produce with liquid ammonium nitrate the continous way Production of Potassium Nitrate system combined, it is characterized in that, described saltpetre vacuum crystallization device is the device of 2 ~ 10 grades of cascaded structures, every one-level cascaded structure comprises crystallizer, condenser, vacuum pump and discharging pump, the upper end of crystallizer is communicated with the upper end of condenser by pipeline, the lower end of condenser is connected with vacuum pump by pipeline, the lower end of condenser is also connected with tank by condensing water conduit, the lower end of crystallizer is connected with discharging pump by pipeline, the discharge port of discharging pump is connected with next stage crystallizer opening for feed, the discharge port of dissolving tank is connected with the opening for feed of the crystallizer of first step cascaded structure, last step discharging pump is connected with the opening for feed of a thickener.Every grade of condenser lower end has condensing water conduit to lead to tank, can be used as cycling use of water and returns Repone K dissolving tank.Material is transferred to N+1 level saltpetre vacuum crystallization device by discharging pump by N (1<N<10) level saltpetre vacuum crystallization device, and last step saltpetre vacuum crystallization device passes through discharging pump pump to thickener.
3. according to claim 1ly produce with liquid ammonium nitrate the continous way Production of Potassium Nitrate system combined, it is characterized in that, described vacuum continuous crystallizer is draft tube baffle crystallizer, OSLO crystallizer, and described saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures.
4. utilize and produce with liquid ammonium nitrate the method that the continous way Production of Potassium Nitrate system combined carries out producing saltpetre described in claim 1, step is as follows:
Circulating mother liquor, water and Repone K is added in dissolving tank, steam heating is dissolved, obtained mixing solutions, described circulating mother liquor is ammonium chloride mother liquor, in mixing solutions, the mol ratio of ammonium ion and chlorion is 1:1 ~ 1.2, mixing solutions enters saltpetre vacuum crystallization device, thickener, a whizzer successively, and centrifugation goes out wetting phase potassium nitrate crystal, and wetting phase saltpetre drying, cooling obtain saltpetre;
Liquefied ammonia enters ammonia evaporator and is evaporated to gas ammonia, gas ammonia is after gas ammonia metre filter, then ammonia preheater is entered, gas ammonia enters the dust technology passed into the second opening for feed in tubular reactor and carries out pressurization neutralization reaction after ammonia preheater is heated to 90 ~ 150 DEG C, the reaction solution that reaction generates enters flash drum, reaction heat is utilized to carry out flash distillation concentrate, obtained ammonium nitrate solution;
After obtained ammonium nitrate solution mixes in tempering tank with the saltpetre mother liquor that centrifugation goes out, feed liquid enters pump circulation adverse current triple effect concentrating unit after the preheating of concentrating and preheating device, and being concentrated into density is 1.30 ~ 1.37g/cm
3after, send into the crystallization of vacuum continuous crystallizer, more successively through secondary thickener, secondary centrifuging machine, through centrifugation ammonia chloride crystal, be separated the ammonium chloride mother liquor obtained and add recycle in dissolving tank.
5. according to claim 5ly produce with liquid ammonium nitrate the method that the continous way Production of Potassium Nitrate system combined carries out producing saltpetre, it is characterized in that, the Heating temperature that in dissolving tank, steam heating is dissolved is 65 ~ 90 DEG C.
6. according to claim 5ly produce with liquid ammonium nitrate the method that the continous way Production of Potassium Nitrate system combined carries out producing saltpetre, it is characterized in that, described saltpetre vacuum crystallization device is the device of 6 grades of cascaded structures; Wherein, in first degree crystalline device, temperature controls at 65 ~ 80 DEG C, and vacuum tightness is 0.020 ~ 0.040MPa; In secondary crystallizer, temperature controls at 50 ~ 65 DEG C, and vacuum tightness is 0.012 ~ 0.020MPa; In three grades of crystallizers, temperature controls at 42 ~ 50 DEG C, and vacuum tightness is 0.005 ~ 0.012MPa; In level Four crystallizer, temperature controls at 35 ~ 42 DEG C, and vacuum tightness is 0.003 ~ 0.005MPa; In Pyatyi crystallizer, temperature controls at 25 ~ 35 DEG C, and vacuum tightness is 0.0020 ~ 0.0030MPa; In six grades of crystallizers, temperature controls at 15 ~ 25 DEG C, and vacuum tightness is 0.0010 ~ 0.0020MPa.
7. according to claim 5ly produce with liquid ammonium nitrate the method that the continous way Production of Potassium Nitrate system combined carries out producing saltpetre, it is characterized in that, passing into dust technology mass concentration in tubular reactor is 40 ~ 60wt%, the reaction pressure of tubular reactor is 0.2 ~ 0.6MPa, temperature of reaction relies on exothermic heat of reaction to provide, the concentration of flash liquid, is controlled by the temperature of secondary steam.
8. according to claim 5ly produce with liquid ammonium nitrate the method that the continous way Production of Potassium Nitrate system combined carries out producing saltpetre, it is characterized in that, the described ammonium nitrate solution mass concentration obtained from flash drum concentrate is 75% ~ 95wt%, in an effect pump circulation concentrating unit in described pump circulation adverse current triple effect concentrating unit, temperature is 110 ~ 115 DEG C, vacuum tightness is 0.18 ~ 0.25MPa, in two effect pump circulation concentrating uniies, temperature is 90 ~ 100 DEG C, vacuum tightness is 0.08 ~ 0.10MPa, in triple effect pump circulation concentrating unit, temperature is 60 ~ 80 DEG C, vacuum tightness is 0.01 ~ 0.05MPa.
9. according to claim 5ly produce with liquid ammonium nitrate the method that the continous way Production of Potassium Nitrate system combined carries out producing saltpetre, it is characterized in that, in described vacuum continuous crystallizer, temperature is 50 ~ 70 DEG C, and vacuum tightness is 0.07 ~ 0.10MPa.
10. produce a method for the continous way saltpetre combined with liquid ammonium nitrate, step is as follows:
(1) ammonium chloride mother liquor, water and Repone K are mixed, be steam heated to 65 ~ 90 DEG C of dissolvings, obtained mixing solutions, in mixing solutions, the mol ratio of ammonium ion and chlorion is 1:1 ~ 1.2,
(2) mixing solutions that step (1) is obtained is carried out six grades of vacuum crystallizations, the temperature of one-level vacuum cyrsytalliser 65 ~ 80 DEG C, vacuum tightness is 0.020 ~ 0.040MPa, the temperature of secondary vacuum crystallizer is 50 ~ 65 DEG C, vacuum tightness is 0.012 ~ 0.020MPa, the temperature of three grades of vacuum cyrsytallisers is 42 ~ 50 DEG C, vacuum tightness is 0.005 ~ 0.012MPa, the temperature of level Four vacuum cyrsytalliser is 35 ~ 42 DEG C, vacuum tightness is 0.003 ~ 0.005MPa, the temperature of Pyatyi vacuum cyrsytalliser is 25 ~ 35 DEG C, vacuum tightness is 0.0020 ~ 0.0030MPa, the temperature of six grades of vacuum cyrsytallisers is 15 ~ 25 DEG C, vacuum tightness is 0.0010 ~ 0.0020MPa,
(3) material after step (2) vacuum crystallization is entered a thickener, make the water content control of thickener out material 40 ~ 50%, then once centrifugal, obtained potassium nitrate crystal and saltpetre mother liquor;
(4) liquefied ammonia is evaporated to gas ammonia after being heated to 5 ~ 15 DEG C, after gas ammonia filters, then enter after ammonia preheater is heated to 90 ~ 150 DEG C in tubular reactor and carry out pressurization neutralization reaction with dust technology, the molar ratio controlling gas ammonia and nitric acid is 0.8 ~ 1.2: 1.The reaction solution flash distillation concentrate that reaction generates, obtained mass concentration is the ammonium nitrate solution of 75%-95wt%;
(5) after saltpetre mother liquor obtained with step (3) for obtained for step (4) ammonium nitrate solution being mixed in tempering tank, ammonium nitrate solution and saltpetre mother liquor ratio are (5 ~ 10): 1, concentrate through pump circulation adverse current triple effect, triple effect thickening temperature is 70 ~ 80 DEG C, two effect thickening temperatures are 90 ~ 100 DEG C, one effect thickening temperature is 110 ~ 115 DEG C, and being concentrated into density is 1.30 ~ 1.37g/cm
3water content 50 ~ 80%, it is 50 ~ 70 DEG C in temperature, vacuum tightness is crystallization under the condition of 0.07 ~ 0.10MPa, then enter secondary thickener, make the moisture mass content of thickener out material control 30 ~ 45%, then secondary centrifuging, obtained ammonia chloride crystal and ammonium chloride mother liquor, the reaction cycle that ammonium chloride mother liquor participates in step (1) utilizes.
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| CN108083299B (en) * | 2018-01-18 | 2023-07-28 | 江西金利达钾业有限责任公司 | Potassium nitrate crystallization production system |
| CN109908613A (en) * | 2019-02-20 | 2019-06-21 | 浙江瀚普智慧科技有限公司 | A kind of multiple-effect evaporation coupling crystallization apparatus and its technique producing nitre sodium salt |
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