CN111849427A - Mixed salt production system of sodium nitrate and potassium nitrate - Google Patents
Mixed salt production system of sodium nitrate and potassium nitrate Download PDFInfo
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- CN111849427A CN111849427A CN202010931414.1A CN202010931414A CN111849427A CN 111849427 A CN111849427 A CN 111849427A CN 202010931414 A CN202010931414 A CN 202010931414A CN 111849427 A CN111849427 A CN 111849427A
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Abstract
The invention relates to the technical field of a nitric acid mixed salt production system, in particular to a sodium nitrate and potassium nitrate mixed salt production system which comprises a mixed salt reaction tank, a plate-and-frame filter press, a cooling crystallizer, a primary washer, a secondary washer, a tertiary washer, a liquid collecting tank, a first piston pushing centrifuge, a second piston pushing centrifuge, a conveyor belt, a fluidized bed dryer, a primary spiral salt washer and a secondary spiral salt washer which are communicated together. The invention has reasonable and compact structure, utilizes the sodium nitrate contained in the high-temperature sodium nitrate mother liquor to carry out potassium preparation reaction with the potassium chloride added externally to generate potassium nitrate and a certain proportion of unreacted sodium nitrate, and carries out washing, impurity removal and trimming proportion on the sodium nitrate and the potassium nitrate by controlling the temperature according to the change of the solubility of the sodium nitrate and the potassium nitrate in water along with the temperature until the mixed salt of the sodium nitrate and the potassium nitrate reaches the set proportion, thereby directly, continuously and efficiently producing the mixed salt consisting of the sodium nitrate and the potassium nitrate.
Description
Technical Field
The invention relates to the technical field of a mixed salt production system of nitric acid, in particular to a mixed salt production system of sodium nitrate and potassium nitrate.
Background
The molten salt is the best high-temperature heat transfer and storage medium recognized in the world, in the current solar photo-thermal power generation or other energy storage application fields, sodium nitrate and potassium nitrate are mixed according to the ratio of 6:4 and then are melted, and the obtained sodium nitrate and potassium nitrate mixed molten salt has the advantages of large heat storage density, low price, stable and easily-adjusted heat release working condition and the like, so that the molten salt mixed molten salt becomes a preferred material for photo-thermal energy storage, and the green and sustainable development molten salt heat storage plays a great role in the aspects of power grid peak regulation, coal-electricity comprehensive energy storage, north heating and the like, so that the molten salt can inevitably become a new trend for future development. The production method of the mixed salt composed of sodium nitrate and potassium nitrate at present comprises the following steps: the method is simple, but has limited capacity and cannot carry out continuous and efficient mass production, and in addition, the extra-purchased simple substance salt inevitably increases a plurality of intermediate links, so the integral production cost is higher.
Disclosure of Invention
The invention provides a mixed salt production system of sodium nitrate and potassium nitrate, which overcomes the defects of the prior art and can effectively solve the problem that the mixed salt consisting of sodium nitrate and potassium nitrate cannot be directly, continuously and efficiently produced in a large scale in the prior art, so that the production cost of the mixed salt is high.
The purpose of the application is realized as follows: the mixed salt production system of sodium nitrate and potassium nitrate comprises a mixed salt reaction tank, a plate-and-frame filter press, a cooling crystallizer, a primary washer, a secondary washer, a tertiary washer, a liquid collecting tank, a first piston pushing centrifugal machine, a second piston pushing centrifugal machine, a conveyor belt, a fluidized bed dryer, a primary spiral salt washing machine, a secondary spiral salt washing machine, a first liquid storage tank, a second liquid storage tank, a third liquid storage tank and a fourth liquid storage tank, wherein a heating device and a stirring device are arranged in the mixed salt reaction tank, the mixed salt reaction tank is provided with a feed pipe for feeding high-temperature sodium nitrate mother liquor and potassium chloride solution, a discharge pipe for discharging reaction clear liquid and a waste pipe for discharging waste salt at the bottom of the tank, the waste pipe is communicated with the feed end of the primary spiral salt washing machine, the discharge end of the primary spiral salt washing machine is communicated with the feed end of the secondary spiral salt washing machine, the discharge end of the secondary spiral salt washing machine is communicated with the feed end of, a waste salt washing water pipeline communicated with the input end of a first liquid storage tank is arranged on the first-stage spiral salt washing machine and the second-stage spiral salt washing machine, liquid in the first liquid storage tank is communicated with a mixed salt reaction tank as a mixture liquid, a discharge pipe is communicated with the feed end of the plate-and-frame filter press, a liquid collecting tank is arranged below the plate-and-frame filter press to collect plate-and-frame washing water for washing the plate-and-frame filter press, liquid in the liquid collecting tank is communicated with the first-stage spiral salt washing machine as waste salt washing water, the filtrate output end of the plate-and-frame filter press is communicated with the feed end of a cooling crystallizer, one part of crystallization mother liquid in the cooling crystallizer is communicated with the input end of a second liquid storage tank through a pipeline, the other part of crystallization mother liquid is communicated with the input end of a third liquid storage tank through a pipeline, liquid in the second liquid storage tank is communicated with the first-, the crystallization output end of the cooling crystallizer is communicated with the feed end of a first-stage washer, the mixed salt washing water in the first-stage washer is communicated with the input end of a fourth liquid storage tank through a pipeline, the liquid in the fourth liquid storage tank is used as waste salt washing water to be communicated with a second-stage spiral salt washing machine, the discharge end of the first-stage washer is communicated with the feed end of a second-stage washer, the discharge end of the second-stage washer is communicated with the feed end of a third-stage washer, the discharge end of the third-stage washer is communicated with the feed end of a second piston pushing centrifuge, the discharge end of the second piston pushing centrifuge corresponds to the input end of a conveyor belt, the output end of the conveyor belt corresponds to the feed end of a fluidized bed dryer, a fifth liquid storage tank for storing the mixed salt washing water of the second-stage washer is arranged between the first-stage washer and the second-stage washer, the liquid in the fifth liquid storage tank is, a sixth liquid storage tank for storing the mixed salt washing water of the third-stage washer is arranged between the second-stage washer and the third-stage washer, the liquid in the sixth liquid storage tank is used as the mixed salt washing water of the second-stage washer and communicated with the second-stage washer, and a soft water input pipeline is further arranged on the third-stage washer and used as a source of the mixed salt washing water of the third-stage washer.
The invention has reasonable and compact structure, utilizes the sodium nitrate contained in the high-temperature sodium nitrate mother liquor to carry out potassium preparation reaction with the potassium chloride added externally to generate potassium nitrate and a certain proportion of unreacted sodium nitrate, and carries out washing, impurity removal and trimming proportion on the sodium nitrate and the potassium nitrate by controlling the temperature according to the change of the solubility of the sodium nitrate and the potassium nitrate in water along with the temperature until the mixed salt of the sodium nitrate and the potassium nitrate reaches the set proportion.
Drawings
The specific structure of the application is given by the following figures and examples:
FIG. 1 is a schematic process flow diagram of a mixed salt production system of sodium nitrate and potassium nitrate.
Legend: 1. the system comprises a salt mixing reaction tank, 2, a plate-and-frame filter press, 3, a cooling crystallizer, 4, a first-stage washer, 5, a second-stage washer, 6, a third-stage washer, 7, a liquid collecting tank, 8, a first piston pushing centrifugal machine, 9, a second piston pushing centrifugal machine, 10, a conveying belt, 11, a fluidized bed dryer, 12, a first-stage spiral salt washing machine, 13, a second-stage spiral salt washing machine, 14, a first liquid storage tank, 15, a second liquid storage tank, 16, a third liquid storage tank, 17, a fourth liquid storage tank, 18, a fifth liquid storage tank, 19 and a sixth liquid storage tank.
Detailed Description
The present application is not limited to the following examples, and specific implementations may be determined according to the technical solutions and practical situations of the present application.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 in the specification.
The invention is further described below with reference to examples and figures, examples being: as shown in figure 1, the mixed salt production system of sodium nitrate and potassium nitrate comprises a mixed salt reaction tank 1, a plate-and-frame filter press 2, a cooling crystallizer 3, a primary washer 4, a secondary washer 5, a tertiary washer 6, a liquid collecting tank 7, a first piston pushing centrifugal machine 8, a second piston pushing centrifugal machine 9, a conveyor belt 10, a fluidized bed dryer 11, a primary spiral salt washer 12, a secondary spiral salt washer 13, a first liquid storage tank 14, a second liquid storage tank 15, a third liquid storage tank 16 and a fourth liquid storage tank 17, wherein a heating device and a stirring device are arranged in the mixed salt reaction tank 1, the mixed salt reaction tank 1 is provided with a feeding pipe for feeding high-temperature sodium nitrate mother liquor and potassium chloride solution, a discharging pipe for discharging reaction clear liquid and a waste pipe for discharging waste salt at the bottom of the tank, the waste pipe is communicated with the feeding end of the primary spiral salt washer 12, the discharging end of the primary spiral salt washer 12 is communicated with the feeding end of the secondary spiral salt washer 13, the discharge end of a secondary spiral salt washing machine 13 is communicated with the feed end of a first piston pushing centrifuge 8, waste salt washing water pipelines communicated with the input end of a first liquid storage tank 14 are arranged on a primary spiral salt washing machine 12 and the secondary spiral salt washing machine 13, liquid in the first liquid storage tank 14 is communicated with a mixed salt reaction tank 1 as a mixture liquid, a discharge pipe is communicated with the feed end of a plate-and-frame filter press 2, a liquid collecting tank 7 is arranged below the plate-and-frame filter press 2 to collect plate-and-frame washing water for washing the plate-and-frame filter press 2, liquid in the liquid collecting tank 7 is communicated with the primary spiral salt washing machine 12 as waste salt washing water, the filtrate output end of the plate-and-frame filter press 2 is communicated with the feed end of a cooling crystallizer 3, one part of crystal mother liquid in the cooling crystallizer 3 is communicated with the input end of a second liquid storage tank 15 through a pipeline, the other part of the, the liquid in the second liquid storage tank 15 is used as waste salt washing water to be communicated with a primary spiral salt washing machine 12, the liquid in the third liquid storage tank 16 is used as a proportioning liquid to be communicated with a mixed salt reaction tank 1, the crystallization output end of the cooling crystallizer 3 is communicated with the feed end of the primary washing machine 4, the mixed salt washing water in the primary washing machine 4 is communicated with the input end of a fourth liquid storage tank 17 through a pipeline, the liquid in the fourth liquid storage tank 17 is used as waste salt washing water to be communicated with a secondary spiral salt washing machine 13, the discharge end of the primary washing machine 4 is communicated with the feed end of a secondary washing machine 5, the discharge end of the secondary washing machine 5 is communicated with the feed end of a tertiary washing machine 6, the discharge end of the tertiary washing machine 6 is communicated with the feed end of a second piston material-pushing centrifugal machine 9, the discharge end of the second piston material-pushing centrifugal machine 9 corresponds to the input end of a conveyor belt 10, the output end of the conveyor, a fifth liquid storage tank 18 for storing the water after the mixed salt washing of the secondary washer 5 is arranged between the primary washer 4 and the secondary washer 5, the liquid in the fifth liquid storage tank 18 is used as the mixed salt washing water of the primary washer 4 to be communicated with the primary washer 4, a sixth liquid storage tank 19 for storing the water after the mixed salt washing of the tertiary washer 6 is arranged between the secondary washer 5 and the tertiary washer 6, the liquid in the sixth liquid storage tank 19 is used as the mixed salt washing water of the secondary washer 5 to be communicated with the secondary washer 5, and a soft water input pipeline is also arranged on the tertiary washer 6 to be used as the source of the mixed salt washing water of the tertiary washer 6.
The high-temperature sodium nitrate mother liquor used in the invention is a one-effect evaporation mother liquor prepared from nitratine, the concentration of the high-temperature sodium nitrate mother liquor is between 900-1200g/l, the sodium nitrate solution with the concentration is not easy to be directly added into potassium chloride for reaction, mainly because the conversion time is prolonged, the waste salt is not easy to separate or the entrainment amount is too large, in order to avoid the situation, the liquid in the first liquid storage tank 14 and the third liquid storage tank 16 can be added as a dosing liquid, the concentration of the sodium nitrate in the raw material liquid reaches 600-950g/l, then the potassium chloride is added for potassium dosing reaction, the potassium dosing reaction is carried out for evaporation reaction for 1-4 hours within the temperature range of 90-120 ℃, then the mixture is clarified for 1 hour under the heat preservation state, a supernatant (mainly potassium nitrate and a certain proportion of unreacted sodium nitrate solution) and bottom waste salt are obtained, and the bottom waste salt discharged from the mixed salt reaction tank 1 is sequentially pumped into a primary spiral salt washer 12, And washing in the secondary spiral salt washing machine 13 to recycle useful ions such as nitrate, sodium ions and potassium ions, wherein waste salt washing water in the primary spiral salt washing machine 12 comes from liquid pumped by a rear second liquid storage tank 15 and a liquid collecting tank 7, waste salt washing water in the secondary spiral salt washing machine 13 comes from liquid pumped by a rear fourth liquid storage tank 17, and waste salt washing water of the primary spiral salt washing machine 12 and the secondary spiral salt washing machine 13 uniformly flows into a first liquid storage tank 14 for storage so as to be used as a dosing liquid for the potassium mixing reaction in the next salt mixing reaction tank 1. The waste salt discharged by the secondary spiral salt washer 13 enters the first piston pusher centrifuge 8, and is subjected to solid-liquid separation by the first piston pusher centrifuge 8, and the waste salt solid is finally discharged into a salt pile for uniform treatment.
After the sodium nitrate high-temperature mother liquor and the potassium chloride solution react in the mixed salt reaction tank 1, the supernatant in the mixed salt reaction tank 1 is pumped into the plate and frame filter press 2 by using a pump, the supernatant is filtered and purified to obtain purer sodium nitrate and potassium nitrate filtrate, after the plate and frame filter press 2 operates for a period of time, mud cakes on the plate and frame need to be cleaned, and plate and frame washing water can flow into and be stored in the liquid collecting tank 7 in the process of washing the plate and frame filter press 2 so as to be used by the one-level spiral salt washing machine 12 during salt washing.
And (3) the filtrate output from the plate-and-frame filter press 2 enters the cooling crystallizer 3 through a pump to perform crystallization reaction, the working temperature in the cooling crystallizer 3 is 20-40 ℃, the filtrate enters the cooling crystallizer 3 and then reacts for 1-4 hours, sodium nitrate crystals, potassium nitrate crystals and crystallization mother liquor are finally obtained, a part of crystallization mother liquor enters a third storage tank to be stored and used as a proportioning liquid for potassium reaction in the next mixed salt reaction tank 1, and the other part of crystallization mother liquor is stored in a second storage tank 15 and used together with the liquid in the liquid collecting tank 7 as waste salt washing water of the primary spiral salt washing machine 12.
The crystal in the cooling crystallizer 3 enters a primary scrubber 4, a secondary scrubber 5 and a tertiary scrubber 6 in sequence in a pumping mode, in the process, the crystal (mixed salt of sodium nitrate and potassium nitrate) is respectively washed by three stages of countercurrent flows by saturated solution, and according to the change of the solubility of the sodium nitrate and the potassium nitrate in water along with the temperature, and washing, impurity removal and proportion correction are carried out on the mixed salt by controlling the temperature until the mixed salt of the potassium nitrate and the sodium nitrate reaches a set proportion (4: 6), the mixed salt washed water of the primary scrubber 4 is pumped into a fourth liquid storage tank 17 and is reserved as the waste salt washing water of the secondary spiral type salt washing machine 13, the mixed salt washed water of the secondary scrubber 5 is pumped into a fifth liquid storage tank 18 and is reserved as the waste salt washing water of the primary scrubber 4, and the mixed salt washed water of the tertiary scrubber 6 is pumped into a sixth liquid storage tank 19 and is reserved as the waste salt washing water of the secondary scrubber 5.
The ratio (4: 6) of potassium nitrate to sodium nitrate in the crystal after the three-stage countercurrent washing is not changed greatly, the content of chloride ions in the crystal can be reduced to be below 0.05%, the sum of the content of potassium ions and the content of nitrate ions is less than 2%, the washing water of the three-stage washer 6 is from soft water (distilled water) input by a soft water input pipeline, after the crystal is washed and tested by the three-stage washer 6 to be qualified, the mixed salt in the three-stage washer 6 is pumped into a second piston pusher centrifuge 9 for solid-liquid separation, the mixed salt is input into a fluidized bed dryer 11 through a conveyor belt 10 for thorough drying, and finally the mixed salt is packaged by a packaging machine to obtain a finished product of the mixed salt of potassium nitrate and sodium nitrate with high purity according to a certain ratio.
The plate and frame filter press 2, the cooling crystallizer 3, the first piston pushes away material centrifuge 8, the second piston pushes away material centrifuge 9, one-level spiral salt washer 12, the spiral salt washer 13 of second grade, fluidized bed dryer 11 all is current well-known technology, mix salt retort 1 is including setting up respectively at jar body upside, the inlet pipe of downside, the waste pipe, be provided with the discharging pipe that is linked together with plate and frame filter press 2 feed end in the middle part of jar body, still be provided with the batching pipe that is linked together with first liquid storage pot 14, third liquid storage pot 16 on jar body respectively, the internal heating device of jar is the coil pipe that is linked together with external heating steam, agitating unit is motor drive's stirring rake, the stirring portion of stirring rake sets up to in the jar body. The first-stage washer 4, the second-stage washer 5 and the third-stage washer 6 comprise a salt washing pool and a stirring paddle driven by a motor, and the stirring part of the stirring paddle extends into the salt washing pool. The first-level spiral salt washing machine 12 and the second-level spiral salt washing machine 13 are both spiral salt washing machines in the prior art, are similar to a spiral conveyor in structure, rotate by a spiral, play a role in stirring, washing and conveying mixed salt, spray and enter washing liquid from the middle of the spiral salt washing machine, and perform countercurrent washing opposite to logistics, suspended impurities overflow from a tail overflow groove, and precipitated impurities are periodically discharged from a tank bottom blow-down valve.
The method can directly, continuously and efficiently produce the mixed salt consisting of the sodium nitrate and the potassium nitrate, has low production cost, can recycle the wastewater in each link, effectively avoids waste, and has the advantages of energy conservation, environmental protection and little pollution.
The foregoing description is by way of example only and is not intended as limiting the embodiments of the present application. All obvious variations and modifications of the present invention are within the scope of the present invention.
Claims (1)
1. A mixed salt production system of sodium nitrate and potassium nitrate is characterized by comprising a mixed salt reaction tank, a plate-and-frame filter press, a cooling crystallizer, a primary washer, a secondary washer, a tertiary washer, a liquid collecting tank, a first piston pushing centrifugal machine, a second piston pushing centrifugal machine, a conveyor belt, a fluidized bed dryer, a primary spiral salt washer, a secondary spiral salt washer, a first liquid storage tank, a second liquid storage tank, a third liquid storage tank and a fourth liquid storage tank, wherein a heating device and a stirring device are installed in the mixed salt reaction tank, the mixed salt reaction tank is provided with a feeding pipe for feeding high-temperature sodium nitrate mother liquor and potassium chloride solution, a discharging pipe for discharging reaction clear liquid and a waste pipe for discharging waste salt at the bottom of the tank, the waste pipe is communicated with the feeding end of the primary spiral salt washer, the discharging end of the primary spiral salt washer is communicated with the feeding end of the secondary spiral salt washer, the discharge end of the secondary spiral salt washing machine is communicated with the feed end of the first piston pushing centrifuge, waste salt washing water pipelines communicated with the input end of the first liquid storage tank are arranged on the primary spiral salt washing machine and the secondary spiral salt washing machine, liquid in the first liquid storage tank is communicated with the mixed salt reaction tank as a mixture, the discharge pipe is communicated with the feed end of the plate-and-frame filter press, a liquid collecting tank is arranged below the plate-and-frame filter press to collect plate-and-frame washing water for washing the plate-and-frame filter press, the liquid in the liquid collecting tank is communicated with the primary spiral salt washing machine as waste salt washing water, the filtrate output end of the plate-and-frame filter press is communicated with the feed end of the cooling crystallizer, one part of crystallization mother liquid in the cooling crystallizer is communicated with the input end of the second liquid storage tank through a pipeline, the other part of crystallization mother liquid is communicated with the input end of the third liquid storage tank through a pipeline, the liquid in the third liquid storage tank is communicated with the mixed salt reaction tank as a mixture, the crystallization output end of the cooling crystallizer is communicated with the feed end of the first-stage washer, the mixed salt washing water in the first-stage washer is communicated with the input end of the fourth liquid storage tank through a pipeline, the liquid in the fourth liquid storage tank is communicated with the second-stage spiral salt washing machine as waste salt washing water, the discharge end of the first-stage washer is communicated with the feed end of the second-stage washer, the discharge end of the second-stage washer is communicated with the feed end of the third-stage washer, the discharge end of the third-stage washer is communicated with the feed end of the second piston material-pushing centrifugal machine, the discharge end of the second piston material-pushing centrifugal machine corresponds to the input end of the conveyor belt, the output end of the conveyor belt corresponds to the feed end of the fluidized bed dryer, a fifth liquid storage tank for storing the mixed salt washing water of the, the liquid in the fifth liquid storage tank is used as the mixed salt washing water of the first-stage washer and communicated with the first-stage washer, a sixth liquid storage tank for storing the mixed salt washing water of the third-stage washer is arranged between the second-stage washer and the third-stage washer, the liquid in the sixth liquid storage tank is used as the mixed salt washing water of the second-stage washer and communicated with the second-stage washer, and a soft water input pipeline is further arranged on the third-stage washer and used as a source of the mixed salt washing water of the third-stage washer.
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| CN202010931414.1A CN111849427A (en) | 2020-09-07 | 2020-09-07 | Mixed salt production system of sodium nitrate and potassium nitrate |
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| CN202010931414.1A CN111849427A (en) | 2020-09-07 | 2020-09-07 | Mixed salt production system of sodium nitrate and potassium nitrate |
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| CN101234768A (en) * | 2007-01-31 | 2008-08-06 | 新疆硝石钾肥有限公司 | Method for producing potassium nitrate by sodium nitrate and potassium chloride double decomposition reaction |
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| CN205709906U (en) * | 2016-06-11 | 2016-11-23 | 新疆硝石钾肥有限公司 | Balanced recycle mother solution equipment for purifying based on evaporation salt making system |
| CN110560454A (en) * | 2019-09-02 | 2019-12-13 | 南京格洛特环境工程股份有限公司 | Recycling treatment process for low-boiling-point waste salt |
| CN110963511A (en) * | 2019-11-27 | 2020-04-07 | 新疆硝石钾肥有限公司 | System and method for producing optical glass-grade potassium nitrate by using sodium nitrate high-temperature mother liquor |
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2020
- 2020-09-07 CN CN202010931414.1A patent/CN111849427A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234768A (en) * | 2007-01-31 | 2008-08-06 | 新疆硝石钾肥有限公司 | Method for producing potassium nitrate by sodium nitrate and potassium chloride double decomposition reaction |
| CN102585779A (en) * | 2011-11-18 | 2012-07-18 | 牟邦志 | Preparation method of high-purity heat-conduction energy storage molten salt |
| CN103539166A (en) * | 2013-10-31 | 2014-01-29 | 洛阳氟钾科技有限公司 | Method for preparing potassium nitrate by use of potassium feldspar |
| CN205709906U (en) * | 2016-06-11 | 2016-11-23 | 新疆硝石钾肥有限公司 | Balanced recycle mother solution equipment for purifying based on evaporation salt making system |
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