CN211644617U - System for producing optical glass-grade potassium nitrate by using sodium nitrate high-temperature mother liquor - Google Patents
System for producing optical glass-grade potassium nitrate by using sodium nitrate high-temperature mother liquor Download PDFInfo
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Abstract
The utility model relates to a technical field of potassium nitrate production system is a system for produce light glass level potassium nitrate with sodium nitrate high temperature mother liquor, and it is including batching jar, plate and frame pressure filter, vacuum crystallizer, first filtration washing device, dissolving tank, cooling crystallizer, second filtration washing device, first double-stage material pushing centrifuge, the second double-stage material pushing centrifuge, fluidized bed desiccator, two effect evaporation ware. The utility model discloses the aqueous solution that each production processes produced can both obtain abundant cyclic utilization, make potassium ion's total yield more than 95%, nitrate ion's total yield is more than 98%, no wastewater discharge, the consumption of water reduces by a wide margin, the solubility that utilizes the potassium nitrate is influenced by the temperature great, and the solubility of other miscellaneous salt (sodium chloride, sodium sulfate etc.) receives the less principle of temperature influence, carry out twice crystallization and twice washing to the potassium nitrate, can effectively get rid of the impurity ion in the potassium nitrate crystal, obtain the optical glass level potassium nitrate of purity more than 99.9%.
Description
Technical Field
The utility model relates to a technical field of potassium nitrate production system is a system for produce light glass level potassium nitrate with sodium nitrate high temperature mother liquor.
Background
The optical glass-grade potassium nitrate is mainly used for strengthening glass (the thickness of which is less than 0.7 mm) of a touch screen (a mobile phone, a computer, a cash dispenser and the like), and the glass is placed in molten potassium nitrate salt to form compressive stress on the surface of the glass through sodium and potassium exchange, so that the strength of the glass is increased, and the characteristics of difficult damage and easy processing are achieved. At present, few enterprises can produce optical glass-grade potassium nitrate, and the main reason is that the optical glass-grade potassium nitrate is required to have high purity, the impurity content is required to reach the ppm level, and impurities harmful to human bodies are even required to reach the ppb level, so that the optical glass-grade potassium nitrate has strict requirements on production raw materials, production processes, production environments and the like.
At present, the mainstream production process of high-purity glass-grade potassium nitrate mainly comprises two types: one method is to produce potassium nitrate by using ammonium nitrate and potassium chloride as raw materials, then further remove impurities (mainly removing impurities by an alkaline process) and purify the potassium nitrate to produce high-purity light wave-level potassium nitrate, and because byproducts of the reaction are not easy to dissolve in water, the raw materials are impure, the environment is not clean and the like, a certain indexes are not easy to reach in the production process, and the product percent of pass is only about 70%; the other method is the purification production of waste potassium nitrate or industrial potassium nitrate after glass strengthening, and adopts a recrystallization process to produce high-purity optical wave-level potassium nitrate, the difficulty of the process is the treatment of evaporated liquor, because the raw materials contain impurities, the impurities are gradually enriched in the production process, when reaching a certain degree, such as the content of chloride ions in the dissolved liquor is more than 3g/L, the problem of influencing the product quality exists, so that the liquid generated in the reaction process needs to be discharged outwards according to the actual situation, the raw material yield is low, and the environment is polluted. The other production processes are eliminated due to high production cost or poor product quality as proved by practice, the existing production process for producing the optical glass-grade potassium nitrate generally has the problems of high energy consumption and large water consumption, and the purity of potassium nitrate products in the working section is low due to the fact that the post-washing liquid cannot be completely emptied when the potassium nitrate crystals are washed, so that the optical glass-grade potassium nitrate production process which is low in energy consumption, low in water consumption, free of pollution, high in raw material yield and product qualification rate and convenient to control is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a system for produce light glass level potassium nitrate with sodium nitrate high temperature mother liquor has overcome above-mentioned prior art not enough, and its production technology that can effectively solve current light glass level potassium nitrate ubiquitous energy consumption is high, the water consumption is many, there is the problem that pollutes, raw materials yield and product percent of pass are low, be not convenient for control.
The purpose of the application is realized as follows: the system for producing the optical glass-grade potassium nitrate by using the high-temperature sodium nitrate mother liquor comprises a batching tank, a plate-and-frame filter press, a vacuum crystallizer, a first filtering and washing device, a dissolving tank, a cooling crystallizer, a second filtering and washing device, a first double-stage material-pushing centrifugal machine, a second double-stage material-pushing centrifugal machine, a fluidized bed dryer and a double-effect evaporator, wherein a heating device and a stirring device are arranged in the batching tank, a liquid-phase discharge port on the batching tank is communicated with a feed port of the plate-and-frame filter press, a liquid-phase outlet of the plate-and-frame filter press is communicated with a feed port of the vacuum crystallizer, a crystal slurry outlet of the vacuum crystallizer is communicated with a feed port of the first filtering and washing device, a solid-phase outlet on the first filtering and washing device is communicated with the dissolving tank, a heating device is also arranged, the liquid outlet of the dissolving tank is communicated with the feed inlet of the cooling crystallizer, the crystal slurry outlet of the cooling crystallizer is communicated with the feed inlet of a second filtering and washing device, the solid phase outlet of the second filtering and washing device is communicated with the feed inlet of a first double-stage material-pushing centrifugal machine, the liquid phase outlet of the second filtering and washing device is communicated with a fourth liquid storage tank, the liquid phase outlet of the first double-stage material-pushing centrifugal machine is communicated with the fourth liquid storage tank, the solid phase outlet of the first double-stage material-pushing centrifugal machine is communicated with the feed inlet of a fluidized bed dryer, the discharge outlet of the fluidized bed dryer is communicated with the feed inlet of a packaging machine, a liquid collecting tank is arranged below the plate-and-frame filter press, the liquid collecting tank is communicated with the first liquid storage tank, a second double-stage material-pushing centrifugal machine and a double-effect evaporator are also arranged outside the batching tank, the solid phase, the liquid outlets of the first liquid storage tank and the third liquid storage tank are respectively communicated with the batching tank, the other liquid phase outlet on the batching tank is communicated with the feed inlet of the double-effect evaporator, the discharge port of the double-effect evaporator is communicated with a fifth liquid storage tank, the liquid outlet of the fifth liquid storage tank is communicated with the batching tank, and the liquid outlets of the second liquid storage tank and the fourth liquid storage tank are communicated with the feed inlet of the first filtering and washing device.
The following are further optimization or/and improvement of the technical scheme of the utility model: further, the heating device is a coil communicated with the heating steam, and the stirring device is a stirring paddle driven by a motor.
Further, the first filtering and washing device and the second filtering and washing device respectively comprise a frame, a tipping bucket mechanism, a spiral conveyor, a filtering pump and a control host, wherein the tipping bucket mechanism and the spiral conveyor are respectively arranged on the frame, the control host is arranged outside the frame, a filter plate is arranged in a hopper on the tipping bucket mechanism, an upper feed inlet of the spiral conveyor corresponds to the dumping side of the hopper on the tipping bucket mechanism, a filter liquid pipe and a filtering tank are also arranged below the hopper, one end of the filter liquid pipe is communicated with the bottom of the hopper, the other end of the filter liquid pipe is communicated with the bottom of the filtering tank, the bottom of the filtering tank is provided with the filtering pump communicated with the filtering tank, the top of the filtering tank is provided with a vacuum pipe, a material inlet of the hopper is a feed inlet of the filtering and washing device, a discharge outlet of the spiral conveyor is a solid phase outlet of the filtering and washing device, a discharge outlet of the filtering pump is a liquid phase outlet of the filtering, the control host is respectively and electrically connected with the tipping bucket mechanism, the screw conveyor and the suction filtration pump so as to control the operation of the tipping bucket mechanism, the screw conveyor and the suction filtration pump.
Furthermore, the tipping mechanism comprises a hopper, hydraulic cylinders and a hydraulic station, wherein the front side and the rear side of the outer wall of the bottom of the hopper are fixedly connected with rotating shafts, a bearing seat corresponding to the rotating shafts is fixedly arranged on the rack, the rotating shafts are arranged in the bearing seat, the rack opposite to the dumping side of the hopper is provided with at least one hydraulic cylinder, a piston rod on the hydraulic cylinder is hinged with the outer wall of the hopper, the hydraulic station is arranged outside the rack, the hydraulic station is connected with the hydraulic cylinders, and the hydraulic station is electrically connected with the control host.
Furthermore, at least one vibrator is further installed on the outer wall of the hopper, and the control host is electrically connected with the vibrator to control the operation of the vibrator.
The utility model has the advantages that:
1. the utility model discloses a semi-manufactured goods in sodium nitrate workshop is sodium nitrate high temperature mother liquor (120 ℃ -150 ℃) and is as the raw materials, produce high-purity glass level potassium nitrate, can not only make full use of the heat in the sodium nitrate high temperature mother liquor to reduce the steam consumption in the production technology process, but also reduce the operation link compared with the technology of utilizing finished product sodium nitrate to produce potassium nitrate, reduce the technology energy consumption, improve the energy utilization rate, because the sodium nitrate high temperature mother liquor can adopt the pipeline transport, so the flow of solution is easily and accurately controlled, the batching precision is improved and the automation level of batching is improved;
2. the water solution produced by each production process of the utility model can be fully recycled, so that the total yield of potassium ions is more than 95%, the total yield of nitrate ions is more than 98%, and no waste water is discharged;
3. the utility model utilizes the principle that the solubility of potassium nitrate is greatly influenced by temperature and the solubility of other miscellaneous salts (sodium chloride, sodium sulfate and the like) is less influenced by temperature, and carries out twice crystallization and twice washing on potassium nitrate, thereby effectively removing impurity ions in potassium nitrate crystals and finally obtaining the optical glass-grade potassium nitrate with the qualification rate of more than 95 percent and the purity of more than 99.9 percent;
4. compared with the existing potassium nitrate production system, the first filtering and washing device and the second filtering and washing device are of the unique structure of the utility model, are used for the solid-liquid separation of crystal mush and the washing of potassium nitrate crystals, and through the arrangement of the first filtering and washing device and the second filtering and washing device, the liquid in the hopper can be quickly pumped to be dry, no residual liquid is really realized in the hopper, and because the residual liquid contains various impurities, the problem that the purity of potassium nitrate products in the workshop section is low due to the existence of the residual liquid in the prior art can be effectively avoided, the qualification rate and the purity of finished potassium nitrate products in the light glass grade can be effectively ensured, the first filtering and washing device and the second filtering and washing device can realize the automatic transfer of materials and the quick separation between solid and liquid when in work, the potassium nitrate crystals do not need to be manually transferred, the time and labor are saved, the efficiency is, has strong practicability.
Drawings
The specific structure of the application is given by the following figures and examples:
FIG. 1 is a schematic connection structure diagram of a system for producing optical glass-grade potassium nitrate by using high-temperature mother liquor of sodium nitrate;
FIG. 2 is a schematic process flow diagram of the production of optical glass-grade potassium nitrate by using the structure shown in FIG. 1;
FIG. 3 is a schematic structural diagram of the first filtering and washing device and the second filtering and washing device.
Legend: 1. the device comprises a dosing tank, 2, a plate-and-frame filter press, 3, a vacuum crystallizer, 4, a hopper, 5, a suction filtration tank, 6, a suction filtration pump, 7, a filter plate, 8, a screw conveyor, 9, a vacuum tube, 10, a filter liquor tube, 11, a cooling crystallizer, 12, a first double-stage material-pushing centrifugal machine, 13, a second double-stage material-pushing centrifugal machine, 14, a fluidized bed dryer, 15, a two-effect evaporator, 16, a first liquid storage tank, 17, a second liquid storage tank, 18, a third liquid storage tank, 19, a fourth liquid storage tank, 20, a fifth liquid storage tank, 21, a dissolving tank, 22, a liquid collecting tank, 23, a hydraulic cylinder, 24, a bearing seat, 25, a vibrator, 26, a feeding hole of a filtering and washing device, 27, a solid phase outlet of the filtering and washing device, 28 and.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the scope of the present invention is not limited thereto, and the specific embodiments can be determined according to the technical solution and practical circumstances of the present invention.
As shown in attached figures 1 and 3, the system for producing optical glass-grade potassium nitrate by using sodium nitrate high-temperature mother liquor comprises a mixing tank 1, a plate-and-frame filter press 2, a vacuum crystallizer 3, a first filtering and washing device, a dissolving tank 21, a cooling crystallizer 11, a second filtering and washing device, a first double-stage material-pushing centrifugal machine 12, a second double-stage material-pushing centrifugal machine 13, a fluidized bed dryer 14 and a double-effect evaporator 15, wherein a heating device and a stirring device are arranged in the mixing tank 1, a liquid-phase discharge port on the mixing tank 1 is communicated with a feed port of the plate-and-frame filter press 2, a liquid-phase outlet of the plate-and-frame filter press 2 is communicated with a feed port of the vacuum crystallizer 3, a crystal slurry outlet of the vacuum crystallizer 3 is communicated with a feed port of the first filtering and washing device, a solid-phase outlet on the first filtering and washing device is communicated with the dissolving tank 21, a heating device, A second liquid storage tank 17 and a third liquid storage tank 18, wherein the liquid outlet of a dissolving tank 21 is communicated with the feed inlet of a cooling crystallizer 11, the magma outlet of the cooling crystallizer 11 is communicated with the feed inlet of a second filtering and washing device, the solid phase outlet of the second filtering and washing device is communicated with the feed inlet of a first double-stage pushing centrifugal machine 12, the liquid phase outlet of the second filtering and washing device is communicated with a fourth liquid storage tank 19, the liquid phase outlet of the first double-stage pushing centrifugal machine 12 is communicated with the fourth liquid storage tank 19, the solid phase outlet of the first double-stage pushing centrifugal machine 12 is communicated with the feed inlet of a fluidized bed drying machine 14, the discharge port of the fluidized bed drying machine 14 is communicated with the feed inlet of a packaging machine, a liquid collecting tank 22 is arranged below the plate-and frame filter press 2, the liquid collecting tank 22 is communicated with the first liquid storage tank 16, a second double-stage pushing centrifugal machine 13 and a double-effect evaporator 15 are also, the liquid phase outlet of the second double-stage material pushing centrifuge 13 is communicated with a third liquid storage tank 18, the liquid outlets of the first liquid storage tank 16 and the third liquid storage tank 18 are respectively communicated with a dosing tank 1, the other liquid phase outlet on the dosing tank 1 is communicated with the feed inlet of a double-effect evaporator 15, the discharge outlet of the double-effect evaporator 15 is communicated with a fifth liquid storage tank 20, the liquid outlet of the fifth liquid storage tank 20 is communicated with the dosing tank 1, and the liquid outlets of the second liquid storage tank 17 and the fourth liquid storage tank 19 are communicated with the feed inlet of the first filtering and washing device. The heating device is a coil communicated with the heating steam, and the stirring device is a stirring paddle driven by a motor.
The utility model discloses a mode that the transfer between the liquid material was gone into through the pipeline gravity flow and the delivery pump is gone into shifts, the transfer between the solid material shifts through pipeline free fall and through the mode of conveyer belt conveying, plate and frame filter press 2, vacuum crystallizer 3, cooling crystallizer 11, first double-stage material pushing centrifuge 12, second double-stage material pushing centrifuge 13, fluidized bed dryer 14, two effect evaporator 15 all are current well-known technique, and two effect evaporator 15 is exactly to establish ties by two evaporators and constitutes, the utility model discloses a sodium nitrate high temperature mother liquor adopts the peculiar natronite mineral resources in Sinkiang area, through breakage, leaching, evaporation formation sodium nitrate high temperature mother liquor, wherein except containing the required sodium nitrate of preparation potassium nitrate, still contain sodium chloride, miscellaneous salt such as sodium sulfate, the utility model discloses the solubility that mainly utilizes the potassium nitrate of its purification principle that the sodium nitrate high temperature mother liquor produced with potassium chloride reaction is received temperature shadow The noise is large, the solubility of other miscellaneous salts is affected by the temperature and is carried out less, in addition, the design of the first filtering and washing device and the second filtering and washing device which are special in the utility model can realize the automatic transfer of materials and the rapid separation between solid and liquid without the manual work participating in the transfer of potassium nitrate crystals, the time and labor saving efficiency is high, the liquid generated by the first filtering and washing device, the second filtering and washing device, the first double-stage material pushing centrifugal machine 12 and the second double-stage material pushing centrifugal machine 13 can be fully recycled to a washing process and a salt washing process, the consumption of water resources is greatly reduced, the total yield of potassium ions is more than 95 percent, the total yield of nitrate ions is more than 98 percent, and the raw material waste is reduced, therefore, the utility model has no waste water in the operation process, the byproduct waste salt (sodium chloride) can be continuously recycled, through corresponding technical means, purified to industrial sodium chloride, used as raw materials of soda ash, PVC and the like, and has no pollution to the environment.
The utility model discloses to the concrete purification process of potassium nitrate as follows: the mixed liquor in the batching tank 1 is naturally cooled and settled, the bottom salt slurry containing part of mixed salt and potassium nitrate crystals is left in the batching tank 1, the supernatant (potassium nitrate saturated solution) enters a plate-and-frame filter press 2 to be further purified and subjected to solid-liquid separation so as to obtain purer potassium nitrate filter-pressing supernatant, the filter-pressing supernatant passes through a vacuum crystallizer 3, primary crystal slurry containing a large amount of potassium nitrate crystals can be obtained, after the primary crystal slurry enters a first filtering and washing device, the solid-liquid separation of the primary crystal slurry can be realized through a vacuum tube 9 and a suction pump 6, primary crystal substances and primary crystal mother liquor of potassium nitrate are obtained, the primary crystal substances are positioned on a filter plate 7, the primary crystal substances and the primary crystal mother liquor are mutually separated, the content of impurity ions in the primary crystal substances can be reduced, and then the primary crystal substances are washed in a first filtering and washing device for two times, the content of impurity ions in the primary potassium nitrate crystals can be further reduced, the ions with the highest impurity ion content are chloride ions, the primary potassium nitrate crystals are washed by two times by a primary filtering and washing device, the content of the chloride ions in the primary washed substances is ensured to be below 0.09%, the content of other impurity ions is also lower, when the primary washed substances of the potassium nitrate crystals are sent into a dissolving tank 21 to be heated and dissolved, a coarse potassium nitrate aqueous solution is formed, the coarse potassium nitrate aqueous solution can obtain a secondary crystal slurry containing a large amount of potassium nitrate crystals by cooling a crystallizer 11, in order to avoid the precipitation of miscellaneous salts (the raw materials often contain a certain amount of sodium sulfate and sodium chloride), a certain amount of water is added in the crystallization stage to adjust the water balance, after the secondary crystal slurry enters a second filtering and washing device, the solid-liquid separation of the secondary crystal slurry can be realized by a vacuum pump 9 and a suction pump 6, obtain the secondary crystallization thing and the secondary crystallization mother liquor of potassium nitrate, the alternate segregation of secondary crystallization thing and secondary crystallization mother liquor, can reduce the content of impurity ion in the potassium nitrate secondary crystallization thing again, the secondary crystallization thing carries out the washing once again in the second filters the washing device afterwards, can further reduce the content of impurity ion in the potassium nitrate secondary crystallization thing again, through dehydration spin-dry and stoving packing, the final qualification rate that obtains is greater than 95%, the purity is greater than the light glass level potassium nitrate finished product of 99.9%, first filtration washing device, the setting of second filtration washing device can further effectively ensure the qualification rate and the purity of light glass level potassium nitrate finished product.
Further, as shown in fig. 1 and 3, the first filtering and washing device and the second filtering and washing device each include a frame, a tipping mechanism, a screw conveyor 8, a suction pump 6, and a control host, the tipping mechanism and the screw conveyor 8 are respectively mounted on the frame, the control host is disposed outside the frame, a filter plate 7 is mounted in a hopper 4 on the tipping mechanism, an upper feed port of the screw conveyor 8 corresponds to a dumping side of the hopper 4 on the tipping mechanism, a filtrate pipe 10 and a suction tank 5 are further disposed below the hopper 4, one end of the filtrate pipe 10 is communicated with a bottom of the hopper 4, the other end of the filtrate pipe 10 is communicated with a bottom of the suction tank 5, the suction pump 6 communicated with the suction tank 5 is mounted at the bottom of the suction tank 5, a vacuum pipe 9 is disposed at the top of the suction tank 5, a material inlet of the hopper 4 is a feed port 26 of the filtering and washing device, a discharge port of the screw conveyor 8 is a solid phase outlet 27 of the filtering and washing device, the discharge port of the suction filtration pump 6 is a liquid phase outlet 28 of the filtration washing device, and the control host is respectively and electrically connected with the tipping bucket mechanism, the screw conveyor 8 and the suction filtration pump 6 to control the operation of the tipping bucket mechanism, the screw conveyor and the suction filtration pump.
Compared with the existing high-purity potassium nitrate production system, the first filtering and washing device and the second filtering and washing device are the unique design of the utility model, the working principle of the first filtering and washing device is the same as that of the second filtering and washing device, the first filtering and washing device is taken as an example for illustration, when in use, the vacuumizing pipe 9 is connected with the vacuumizing system, the primary crystal slurry which comes out from the vacuum crystallizer 3 and contains a large amount of potassium nitrate crystals enters the hopper 4 of the first filtering and washing device, the vacuumizing system and the suction pump 6 are simultaneously started, negative pressure is formed in the suction filtration tank 5 at the moment, liquid contained in the crystal slurry in the hopper 4, namely, the primary crystal mother liquid can continuously enter the suction filtration tank 5 along the filtrate pipe 10 and is temporarily stored, meanwhile, the suction pump 6 at the bottom of the suction filtration tank 5 synchronously pumps out the primary crystal mother liquid in the suction filtration tank 5, send into and save in first liquid storage pot 16, the primary crystallization thing of potassium nitrate is located filter plate 7 this moment, through such a mode, can all take out the drying and discharge outward with the primary crystallization mother liquor short time in the hopper 4, with this quick separation between primary crystallization thing in the realization primary crystal thick liquid and the primary crystallization mother liquor, evacuation pipe 9 sets up the top at suction filtration jar 5, consequently also can further avoid the mother liquor in suction filtration jar 5 to enter into vacuum pumping system in, prevent that the mother liquor from causing the destruction to vacuum pumping system.
The filter plate 7 is made of filter cloth with frames, after the primary crystallization mother liquor in the hopper 4 is pumped, washing water is needed to be used for washing so as to further reduce the impurity content in the primary crystallization, therefore, after the washing water is added, the vacuum pumping system and the suction pump 6 are used again to pump out the washing water completely, the primary post-washing of potassium nitrate crystals is obtained on the filter plate 7, at the moment, the tipping mechanism is controlled by the control host machine, the hopper 4 pours the primary post-washing of potassium nitrate crystals into the spiral conveyor 8, and the primary post-washing is conveyed to the next process for continuous processing under the transportation of the spiral conveyor 8.
Because first filtration washing device, set up suction pump 6 and the evacuation pipe 9 that is connected with the evacuation system on the suction filtration jar 5 of second filtration washing device, so can drain the liquid in the hopper 4 fast, no raffinate in the hopper 4 has really been accomplished, because contain various impurity in the raffinate, consequently can effectively avoid among the prior art because the existence of raffinate, lead to the problem that the purity of this workshop section potassium nitrate product is low, first filtration washing device filters the washing device with the second and at the during operation, can realize the automatic transportation of material and the flash separation between solid-liquid, need not artifical participation and transport the potassium nitrate crystal, labour saving and time saving is efficient, and simple structure, low in manufacturing cost, very strong practicality has.
Further, as shown in fig. 1 and 3, the tipping mechanism includes a hopper 4, a hydraulic cylinder 23, and a hydraulic station, wherein the front and back sides of the outer wall of the bottom of the hopper 4 are fixedly connected with a rotating shaft, a bearing seat 24 corresponding to the rotating shaft is fixedly arranged on the frame, the rotating shaft is arranged in the bearing seat 24, at least one hydraulic cylinder 23 is arranged on the frame opposite to the dumping side of the hopper 4, a piston rod on the hydraulic cylinder 23 is hinged with the outer wall of the hopper 4, the hydraulic station is arranged outside the frame, the hydraulic station is connected with the hydraulic cylinder 23, and the hydraulic station is electrically connected with the.
The screw conveyer 8 is the prior known technology, the tipping bucket mechanism has a plurality of structural forms, as long as the tipping bucket mechanism can tip materials into the screw conveyer 8, the technical proposal introduced by the utility model is only one of the two, when the tipping bucket mechanism of the utility model needs to tip materials into the screw conveyor 8, firstly, the control mainframe box sends a control signal to the hydraulic station, the hydraulic station will start to operate after receiving the control signal, so that the piston rod on the hydraulic cylinder 23 extends outwards, then the hopper 4 is turned over, the potassium nitrate crystals on the filter plate 7 are poured into the spiral conveyer 8 for transportation, after the hopper 4 stays in the turning over state for a period of time, the hydraulic station can withdraw the hydraulic cylinder 23 by sending a withdrawing command through the control host, and then make the hopper 4 return to the original vertical state, this tipping bucket mechanism simple structure, the working property is stable.
Further, as shown in fig. 3, at least one vibrator 25 is further mounted on the outer wall of the hopper 4, and the control host is electrically connected with the vibrator 25 to control the operation thereof.
As shown in the attached figures 1 to 3, the method for producing the optical glass-grade potassium nitrate by using the system comprises the following steps:
(1) preparing materials: adding sodium nitrate high-temperature mother liquor, proportioning liquid and potassium chloride into a proportioning tank 1, enabling the molar ratio of potassium ions to nitrate radicals in materials in the proportioning tank 1 to be 0.5-1.1, starting a stirring device and a heating device on the proportioning tank 1, controlling the stirring strength and the heating strength of the proportioning tank 1, controlling the heating temperature to be 100-110 ℃, completely dissolving the materials in the proportioning tank 1, keeping the slightly-boiling and non-overflowing state for 1.5-3 h, enabling the sodium nitrate high-temperature mother liquor and the potassium chloride to fully react to form potassium nitrate, then closing the stirring device and the heating device, naturally cooling and settling the materials in the proportioning tank 1 for 0.5-2h (enabling the solid content to be 30-45%), forming supernatant (saturated solution of potassium nitrate) and bottom salt slurry (sodium sulfate, sodium chloride and part of potassium nitrate in the sodium nitrate high-temperature mother liquor), when the density of the supernatant is measured to be 1.498-1.581kg/L, the use requirement is met, otherwise, the mixture liquid needs to be prepared again, the mixture liquid is the liquid in the fifth liquid storage tank 20 in the step (10), when the production is started, no liquid exists in the fifth liquid storage tank 20, and the mixture liquid is replaced by additional clear water;
(2) and (3) filter pressing: inputting the supernatant obtained in the step (1) into a plate-and-frame filter press 2, and further purifying and carrying out solid-liquid separation on the supernatant to form filter-pressed clear liquid and sludge;
(3) vacuum crystallization: conveying the filter-pressing clear liquid in the step (2) into a vacuum crystallizer 3, controlling the pressure in the vacuum crystallizer 3 to be-90 KPa to-100 KPa, controlling the crystallization temperature to be 20-40 ℃, crystallizing for 3-10 h to form primary crystal slurry containing a large amount of potassium nitrate crystals, conveying the primary crystal slurry into a hopper 4 of a first filtering and washing device for solid-liquid separation to form primary crystal mother liquid and primary crystals of potassium nitrate, conveying the primary crystal mother liquid to a first liquid storage tank 16 by a suction filtration pump 6 of the first filtering and washing device for primary washing brine in the step (10), and conveying the primary crystals on a filter plate 7 of the first filtering and washing device;
(4) primary washing: washing the primary crystal in the step (3) with primary washing water and secondary washing water respectively for two times, to remove impurity ions other than potassium nitrate crystals, so that the chlorine ion content in the primary-washed product is 0.09% or less, then the washing operation is finished to form a first washed object, a first washed liquid and a second washed liquid, the first washed liquid is sent to a third liquid storage tank 18 through a suction filtration pump 6 of the first filtering and washing device to be used as secondary washing brine in the step (10), conveying two washing liquids into the second liquid storage tank 17 through the suction pump 6 of the first filtering and washing device, wherein the first washing water and the second washing water are respectively the liquid in the second liquid storage tank 17 and the fourth liquid storage tank 19 in the steps (6) - (8), when the production is started, the second liquid storage tank 17 and the fourth liquid storage tank 19 have no liquid, and the first washing water and the second washing water are replaced by additional clear water;
(5) dissolving: the primary washed object in the step (4) is conveyed to a dissolving tank 21 containing deionized water after coming out of a spiral conveyor 8 of a first filtering and washing device, and then is heated and dissolved by a heating device, wherein the heating temperature is controlled between 100 ℃ and 110 ℃ to form a crude potassium nitrate aqueous solution;
(6) cooling and crystallizing: conveying the crude potassium nitrate aqueous solution obtained in the step (5) into a cooling crystallizer 11 for cooling crystallization, controlling the crystallization temperature to be between 20 and 40 ℃, crystallizing for 3 to 10 hours to form secondary crystal slurry containing a large amount of potassium nitrate crystals, conveying the secondary crystal slurry into a hopper 4 of a second filtering and washing device for solid-liquid separation to form secondary crystal mother liquor and potassium nitrate, conveying the secondary crystal mother liquor into a fourth liquid storage tank 19 for storage through a suction filtration pump 6 of the second filtering and washing device, and retaining the secondary crystal on a filter plate 7 of the second filtering and washing device;
(7) and (3) secondary washing: adding deionized water into a hopper 4 of the second filtering and washing device to wash the secondary crystals in the step (6), further removing impurity ions in the potassium nitrate to obtain purer secondary potassium nitrate washes, and conveying the washed deionized water into a fourth liquid storage tank 19 for storage through a suction pump 6 of the second filtering and washing device;
(8) dewatering and spin-drying: conveying the secondary washed objects in the step (7) out of the spiral conveyor 8 of the second filtering and washing device into a first double-stage pusher centrifuge 12 for dewatering and spin-drying to form a first thrown liquid and wet potassium nitrate crystals, and conveying the first thrown liquid into a fourth liquid storage tank 19 for storage;
(9) drying and packaging: conveying the wet potassium nitrate crystals obtained in the step (8) into a fluidized bed dryer 14 for drying, and finally packaging by a packaging machine to obtain a high-purity optical glass-grade potassium nitrate finished product;
(10) salt washing: stopping the operation of the steps (1) to (9), conveying the liquid in the first liquid storage tank 16 into the proportioning tank 1 as primary salt washing water, carrying out primary dissolution on the bottom salt slurry generated in the step (1) to recover potassium nitrate, sodium nitrate and potassium chloride remained in the bottom salt slurry again, conveying the generated dissolved solution into the dual-effect evaporator 15 for evaporation concentration to form a concentrated solution, conveying the concentrated solution into the fifth liquid storage tank 20 for storage, conveying the liquid in the third liquid storage tank 18 into the proportioning tank 1 as secondary salt washing water, carrying out secondary dissolution on the bottom salt slurry remained after primary salt washing, conveying the generated dissolved solution into the dual-effect evaporator 15 for evaporation concentration, conveying the generated concentrated solution into the fifth liquid storage tank 20 for storage, finally conveying the bottom salt slurry remained after secondary salt washing into the second dual-stage material pushing centrifugal machine 13 for dewatering, and (3) forming waste salt and second thrown liquid, conveying the second thrown liquid into the third liquid storage tank 18 and recycling the second thrown liquid as a part of secondary salt washing water in the next salt washing process, and after salt washing is finished, implementing the steps (1) to (9) to perform a new cycle of circulation.
And (3) after the operation of the steps (1) to (10) for a period of time, washing sludge in the plate-and-frame filter press 2 with clear water to ensure the normal operation of the plate-and-frame filter press 2, naturally settling the slag washing water after the slag washing water enters the liquid collecting tank 22, conveying the slag washing water generated after settling into the first liquid storage tank 16 to be used as part of primary salt washing water to enter a salt washing procedure for recycling, and finally discharging the sludge precipitated at the bottom of the liquid collecting tank 22 to a waste residue stack.
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 (5)
1. A system for producing optical glass-grade potassium nitrate by using sodium nitrate high-temperature mother liquor is characterized by comprising a batching tank, a plate-and-frame filter press, a vacuum crystallizer, a first filtering and washing device, a dissolving tank, a cooling crystallizer, a second filtering and washing device, a first double-stage material-pushing centrifugal machine, a second double-stage material-pushing centrifugal machine, a fluidized bed dryer and a double-effect evaporator, wherein a heating device and a stirring device are arranged in the batching tank, a liquid-phase discharge port on the batching tank is communicated with a feed port of the plate-and-frame filter press, a liquid-phase outlet of the plate-and-frame filter press is communicated with a feed port of the vacuum crystallizer, a crystal slurry outlet of the vacuum crystallizer is communicated with a feed port of the first filtering and washing device, a solid-phase outlet on the first filtering and washing device is communicated with the dissolving tank, a heating device, A second liquid storage tank and a third liquid storage tank, wherein a liquid outlet of the dissolving tank is communicated with a feed inlet of the cooling crystallizer, a crystal slurry outlet of the cooling crystallizer is communicated with a feed inlet of a second filtering and washing device, a solid phase outlet of the second filtering and washing device is communicated with a feed inlet of a first double-stage material-pushing centrifugal machine, a liquid phase outlet of the second filtering and washing device is communicated with a fourth liquid storage tank, a liquid phase outlet of the first double-stage material-pushing centrifugal machine is communicated with a fourth liquid storage tank, a solid phase outlet of the first double-stage material-pushing centrifugal machine is communicated with a feed inlet of a fluidized bed drying machine, a discharge outlet of the fluidized bed drying machine is communicated with a feed inlet of a packaging machine, a liquid collecting tank is arranged below the plate-and frame filter press and communicated with the first liquid storage tank, a second double-stage material-pushing centrifugal machine and a, the liquid phase outlet of the second double-stage material pushing centrifugal machine is communicated with the third liquid storage tank, the liquid outlets of the first liquid storage tank and the third liquid storage tank are respectively communicated with the batching tank, the other liquid phase outlet on the batching tank is communicated with the feed inlet of the double-effect evaporator, the discharge outlet of the double-effect evaporator is communicated with the fifth liquid storage tank, the liquid outlet of the fifth liquid storage tank is communicated with the batching tank, and the liquid outlets of the second liquid storage tank and the fourth liquid storage tank are communicated with the feed inlet of the first filtering and washing device.
2. The system for producing optical glass-grade potassium nitrate by using the sodium nitrate high-temperature mother liquor as claimed in claim 1, wherein the heating device is a coil pipe communicated with heating steam, and the stirring device is a stirring paddle driven by a motor.
3. The system for producing optical glass-grade potassium nitrate by using sodium nitrate high-temperature mother liquor as claimed in claim 1 or 2, characterized in that the first filtering and washing device and the second filtering and washing device both comprise a frame, a tipping mechanism, a screw conveyor, a suction pump and a control host, wherein the tipping mechanism and the screw conveyor are respectively installed on the frame, the control host is arranged outside the frame, a filter plate is installed in a hopper on the tipping mechanism, an upper feed port of the screw conveyor corresponds to the dumping side of the hopper on the tipping mechanism, a filter liquid pipe and a suction tank are further arranged below the hopper, one end of the filter liquid pipe is communicated with the bottom of the hopper, the other end of the filter liquid pipe is communicated with the bottom of the suction tank, the suction pump communicated with the suction tank is installed at the bottom of the suction tank, a vacuum pipe is arranged at the top of the suction tank, and a material inlet of the hopper is a feed port of the filtering and washing device, the discharge port of the screw conveyer is a solid phase outlet of the filtering and washing device, the discharge port of the suction pump is a liquid phase outlet of the filtering and washing device, and the control host is electrically connected with the tipping bucket mechanism, the screw conveyer and the suction pump respectively so as to control the operation of the tipping bucket mechanism, the screw conveyer and the suction pump.
4. The system for producing optical glass-grade potassium nitrate by using the sodium nitrate high-temperature mother liquor as claimed in claim 3, wherein the tipping mechanism comprises a hopper, hydraulic cylinders and a hydraulic station, wherein rotating shafts are fixedly connected to the front side and the rear side of the outer wall of the bottom of the hopper, bearing seats corresponding to the rotating shafts are fixedly arranged on the rack, the rotating shafts are arranged in the bearing seats, at least one hydraulic cylinder is arranged on the rack opposite to the dumping side of the hopper, a piston rod on each hydraulic cylinder is hinged to the outer wall of the hopper, the hydraulic station is arranged outside the rack and connected with the hydraulic cylinders, and the hydraulic station is electrically connected with the control host.
5. The system for producing optical glass-grade potassium nitrate by using the sodium nitrate high-temperature mother liquor as claimed in claim 4, wherein at least one vibrator is further mounted on the outer wall of the hopper, and the control host is electrically connected with the vibrator to control the operation of the vibrator.
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| CN201922081242.9U CN211644617U (en) | 2019-11-27 | 2019-11-27 | System for producing optical glass-grade potassium nitrate by using sodium nitrate high-temperature mother liquor |
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| CN201922081242.9U CN211644617U (en) | 2019-11-27 | 2019-11-27 | System for producing optical glass-grade potassium nitrate by using sodium nitrate high-temperature mother liquor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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