CN213506070U - Sodium nitrate solution crystallization system - Google Patents
Sodium nitrate solution crystallization system Download PDFInfo
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- CN213506070U CN213506070U CN202022251235.1U CN202022251235U CN213506070U CN 213506070 U CN213506070 U CN 213506070U CN 202022251235 U CN202022251235 U CN 202022251235U CN 213506070 U CN213506070 U CN 213506070U
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Abstract
The utility model relates to a sodium nitrate solution crystallization system, the export of flash evaporation charge pump links to each other with the entry of flash evaporation tank, the bottom export of flash evaporation tank links to each other with the entry of cooling circulation pump through flash evaporation discharge pump, the export of cooling circulation pump links to each other with the entry of cooling heat exchanger, the export of cooling heat exchanger links to each other with the inlet pipe of cooling crystallizer, the circulation liquid outlet of cooling crystallizer links to each other with the entry of cooling circulation pump through the cooling circulation pipe; the outlet of the lower part of the side wall of the cooling crystallizer is connected with the inlet of a cooling crystal slurry pump, the outlet of the cooling crystal slurry pump is connected with a cooling thick tank and a cooling circulating pipe, the outlet of the bottom of the cooling thick tank is connected with a cooling centrifuge, the solid-phase outlet of the cooling thick tank is connected with a drying unit, the liquid-phase outlet and the upper overflow port of the cooling crystallizer are connected with the inlet of a cooling mother liquid tank together, and the outlet of the cooling mother liquid tank is connected with an outer discharge pipe of the cooling unit and the cooling circulating pipe through a cooling mother. The system can improve the production efficiency of the crystallized salt and improve the quality.
Description
Technical Field
The utility model relates to an industrial wastewater treatment system especially relates to a sodium nitrate solution crystal system, belongs to waste water utilization technical field.
Background
Toluene diisocyanate (TDI for short) is a main chemical raw material in polyurethane industry, has wide application, and is mainly used for producing polyurethane series products such as sponge, high-grade paint, high-grade adhesive, high-grade elastomer and the like.
Large amounts of waste water are produced during the production of TDI: red water, hydrogenated water, organic wastewater, inorganic wastewater, acidic water, and the like. The wastewater has the characteristics of high salt content, high aniline concentration, high chromaticity, high content of organic matters which are difficult to degrade and the like.
For such wastewater, a single biochemical method and a conventional chemical method are conventionally adopted for treatment, and a large amount of mixed salt wastewater rich in sodium nitrate, sodium chloride and sodium sulfate is generated. At present, mixed miscellaneous salt is qualified as hazardous waste and needs to be further treated, firstly, salt separation of sodium nitrate, sodium chloride and sodium sulfate is realized, and then the mixed miscellaneous salt is respectively recovered, so that resource utilization is realized, and the method is the best way for meeting the environment protection and improving the economic benefit of enterprises.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the problem that exists among the prior art, provide a sodium nitrate solution crystal system, can improve the productivity ratio of sodium nitrate crystal salt, improve the quality of crystal salt.
In order to solve the technical problem, the utility model discloses a sodium nitrate solution crystallization system, including the flash evaporation charge pump, the export of flash evaporation charge pump with the entry of flash evaporation tank links to each other, the flash evaporation tank top is connected with sodium nitrate flash steam pipe, the bottom export of flash evaporation tank links to each other with sodium nitrate cooling crystallization unit through flash evaporation discharge pump; the sodium nitrate cooling crystallization unit comprises a cooling crystallizer, a cooling heat exchanger and a cooling circulating pump, wherein the outlet of the flash evaporation discharging pump is connected with the inlet of the cooling circulating pump, the outlet of the cooling circulating pump is connected with the inlet of the cooling heat exchanger, the outlet of the cooling heat exchanger is connected with the feeding pipe of the cooling crystallizer, and the circulating liquid outlet of the cooling crystallizer is connected with the inlet of the cooling circulating pump through a cooling circulating pipe; the outlet of the lower part of the side wall of the cooling crystallizer is connected with the inlet of a cooling crystal slurry pump, the outlet of the cooling crystal slurry pump is connected with a cooling thick tank and the cooling circulating pipe, the outlet of the bottom of the cooling thick tank is connected with the inlet of a cooling centrifuge, the solid-phase outlet of the cooling centrifuge is connected with a sodium nitrate drying unit, the liquid-phase outlet of the cooling centrifuge is connected with the upper overflow port of the cooling crystallizer and the inlet of a cooling mother liquid tank, and the outlet of the cooling mother liquid tank is connected with an outer discharge pipe of the cooling unit and the cooling circulating pipe through a cooling mother liquid pump.
Compared with the prior art, the utility model discloses following beneficial effect has been obtained: sodium nitrate solution separated from the sodium chloride evaporative crystallization unit is sent to a flash tank by a flash feed pump, flash evaporation and temperature reduction are carried out under vacuum suction, and a part of sodium nitrate is separated out first, so that the energy consumption of the sodium nitrate cooling crystallization unit can be reduced; and (4) sending the sodium nitrate salt subjected to flash evaporation into a sodium nitrate cooling crystallization unit by a flash evaporation discharge pump for cooling crystallization. And a flash evaporation discharge pump sends new sodium nitrate into a cooling circulation pipe, the new sodium nitrate and the circulation liquid enter a cooling circulation pump together, the cooling circulation pump sends a sodium nitrate solution into a cooling heat exchanger to be cooled to normal temperature, a large amount of sodium nitrate is crystallized and separated out after the sodium nitrate solution enters a cooling crystallizer, and the overflow of the cooling crystallizer continues to enter the cooling circulation pipe for circulation. The shell pass of the cooling heat exchanger is provided with cooling water circulation through a first internal circulation pump, an outlet pipeline of the first internal circulation pump is connected with a first refrigerant cache barrel, an outlet of the first refrigerant cache barrel is connected with an inlet of a first refrigerator through a pump, and an outlet of the first refrigerator is connected with an inlet pipeline of the first internal circulation pump. And pumping the sodium nitrate crystal slurry at the bottom of the cooling crystallizer by a cooling crystal slurry pump, sending the sodium nitrate crystal slurry into a cooling thickening tank for caching, sending the sodium nitrate crystal slurry into a cooling centrifuge for solid-liquid separation to obtain high-purity sodium nitrate salt and sodium nitrate centrifugal mother liquor, and sending the obtained sodium nitrate salt into a sodium nitrate drying unit for drying to obtain high-purity sodium nitrate finished salt. The sodium nitrate centrifugal mother liquor, the overflow of the cooling thickening tank and the overflow at the top of the cooling crystallizer enter a cooling mother liquor tank together for collection, the concentration of sodium nitrate in the sodium nitrate centrifugal mother liquor is 41 percent, the concentration of sodium chloride is 7.6 percent, the sodium nitrate centrifugal mother liquor is pumped by a cooling mother liquor pump, and the sodium nitrate centrifugal mother liquor returns to an inlet of a sodium chloride evaporation crystallization unit from an outer discharge pipe of a cooling unit and can also return to a cooling circulation pipe for circulation or impurity salt preparation. The solubility of the sodium nitrate is reduced along with the reduction of the temperature, and the reduction of the solubility below 20 ℃ is gradual; the system cools the sodium nitrate solution to normal temperature for crystallization, and can improve the production efficiency.
As the improvement of the utility model, the dry unit of sodium nitrate includes the vibration drying bed, cooling centrifuge's solid phase export with the feed inlet of vibration drying bed links to each other, the hot-blast import of vibration drying bed links to each other with air heater's export, the hot air exitus of vibration drying bed links to each other with cyclone's air intake, cyclone's bottom discharge mouth with the discharge gate of vibration drying bed links to each other with sodium nitrate baling equipment jointly, cyclone's top air outlet passes through the draught fan and links to each other with water film dust collector's entry, water film dust collector's leakage fluid dram with the entry of cooling mother liquor jar links to each other. And (3) allowing sodium nitrate salt at the outlet of the cooling centrifuge to enter a vibration drying bed for drying, discharging the sodium nitrate salt from the vibration drying bed to obtain finished sodium nitrate salt with the purity of 98%, and packaging the finished sodium nitrate salt in sodium nitrate packaging equipment. After fresh air is sent into an air heater by an air blower to be heated, hot air enters from the lower part of a vibration drying bed, tail gas is discharged from the top of the vibration drying bed, collected materials also enter into a package after being dedusted by a cyclone dust collector, the tail gas is discharged from the top of the cyclone dust collector and enters into a water film deduster for dedusting under the suction of a draught fan, dedusting liquid returns to a cooling mother liquid tank for circulation, the discharge is stopped, and the materials are recovered.
As a further improvement of the utility model, the outlet of the cooling unit outer discharge pipe is connected with the feed inlet of the miscellaneous salt evaporation kettle, the bottom outlet of the miscellaneous salt evaporation kettle is connected with the inlet of the miscellaneous salt centrifuge, the liquid phase outlet of the miscellaneous salt centrifuge is connected with the miscellaneous salt mother liquor temporary storage tank, the outlet of the miscellaneous salt mother liquor temporary storage tank is connected with the reflux port of the miscellaneous salt evaporation kettle through the miscellaneous salt mother liquor reflux pump, and the solid phase outlet of the miscellaneous salt centrifuge is connected with the miscellaneous salt packaging equipment; and an exhaust port of the miscellaneous salt evaporation kettle is connected with an inlet of a surface air cooler II, and an outlet of the surface air cooler II is connected with a vacuum pump II. And waste mother liquor discharged from an outer discharge pipe of the cooling unit enters a mixed salt evaporation kettle for evaporation and crystallization, then enters a mixed salt centrifuge for solid-liquid separation, and is packed in a solid phase to obtain the marketable mixed salt. The mixed salt centrifugal mother liquor enters a mixed salt mother liquor temporary storage tank for storage, is pumped out by a mixed salt mother liquor reflux pump and returns to a mixed salt evaporation kettle for circulation; the waste mother liquor is solidified, so that the waste water is completely recycled, and the quality of the main product salt is improved. And under the suction of the vacuum pump II, the exhaust steam of the mixed salt evaporation kettle enters the surface air cooler II for condensation, and the mixed salt evaporation kettle is maintained under vacuum to accelerate evaporation. Condensed water in a jacket of the miscellaneous salt evaporation kettle enters a miscellaneous salt condensed water collecting tank for collection, and is sent to a condensed water recycling pipe by a miscellaneous salt condensed water pump for recycling.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.
Fig. 1 is a flow chart of the flash evaporation unit and the cooling and crystallizing unit of sodium nitrate according to the present invention.
Fig. 2 is a flow chart of the sodium nitrate drying unit of the present invention.
FIG. 3 is a flow chart of the miscellaneous salt recovery unit of the present invention.
In the figure: 1. a flash feed pump; 2. a sodium nitrate flash evaporation unit; 2a, a flash tank; 2b, a sodium nitrate flash tube; 2c, a flash evaporation discharge pump; 3. a sodium nitrate cooling and crystallizing unit; cooling the crystallizer; 3b, cooling the circulating pipe; 3c, cooling a circulating pump; 3d, cooling the heat exchanger; cooling the crystal slurry pump; 3f, cooling the thick tank; 3g, cooling the centrifuge; cooling the mother liquor tank for 3 h; 3j. a coolant mother liquor pump; 3k, discharging pipes outside the cooling unit; 3m, a first refrigerator; 3n, a first refrigerant cache barrel; 3p, an internal circulation pump I; 4. a sodium nitrate drying unit; 4a. a blower; 4b. an air heater; 4c, vibrating the drying bed; 4d, a cyclone dust collector; 4e, a draught fan; 4f, a water film deduster; 4g, sodium nitrate packaging equipment; 5. a miscellaneous salt recovery unit; 5a, evaporating a miscellaneous salt kettle; 5b, a miscellaneous salt centrifuge; 5c, temporarily storing the miscellaneous salt mother liquor; 5d, a miscellaneous salt mother liquor reflux pump; 5e, packaging equipment for miscellaneous salt; 5f, a surface cooler II; 5g, a vacuum pump II; 5h, a miscellaneous salt condensate water collection tank; 5j, a miscellaneous salt condensate pump; G1. a raw steam pipe; G2. a condensate recovery pipe; G3. a cooling water supply pipe; G4. a cooling water return pipe.
Detailed Description
As shown in figure 1, the sodium nitrate solution crystallization system of the utility model comprises a flash evaporation feed pump 1, a sodium nitrate flash evaporation unit 2 and a sodium nitrate cooling crystallization unit 3. The sodium nitrate flash unit 2 comprises a flash tank 2a, an inlet of the flash tank 2a is connected with an outlet of the flash feed pump 1, and the top of the flash tank 2a is connected with a sodium nitrate flash pipe 2 b; the bottom outlet of the flash tank 2a is connected with a sodium nitrate cooling crystallization unit 3 through a flash discharge pump 2c. Sodium nitrate solution separated from the sodium chloride evaporative crystallization unit 4 is sent to a flash tank 2a by a flash feed pump 1, and is subjected to flash evaporation and temperature reduction under vacuum suction, so that a part of sodium nitrate is separated out firstly, and the energy consumption of the sodium nitrate cooling crystallization unit 3 can be reduced; and sending the sodium nitrate salt subjected to flash evaporation into a sodium nitrate cooling and crystallizing unit 3 by a flash evaporation discharge pump 2c for cooling and crystallizing.
The sodium nitrate cooling crystallization unit 3 comprises a cooling crystallizer 3a, a cooling heat exchanger 3d and a cooling circulating pump 3c, an outlet of the flash evaporation discharging pump 2c is also connected with an inlet of the cooling circulating pump 3c, an outlet of the cooling circulating pump 3c is connected with an inlet of the cooling heat exchanger 3d, an outlet of the cooling heat exchanger 3d is connected with a feeding pipe of the cooling crystallizer 3a, and a circulating liquid outlet of the cooling crystallizer 3a is connected with an inlet of the cooling circulating pump 3c through a cooling circulating pipe 3b. An outlet at the lower part of the side wall of the cooling crystallizer 3a is connected with an inlet of a cooling crystal slurry pump 3e, an outlet of the cooling crystal slurry pump 3e is connected with a cooling thick tank 3f and a cooling circulating pipe 3b, an outlet at the bottom of the cooling thick tank 3f is connected with an inlet of a cooling centrifuge 3g, a solid phase outlet of the cooling centrifuge 3g is connected with a sodium nitrate drying unit 4, a liquid phase outlet of the cooling centrifuge 3g and an upper overflow port of the cooling crystallizer 3a are connected with an inlet of a cooling mother liquor tank 3h together, an outlet of the cooling mother liquor tank 3h is connected with a cooling unit external discharge pipe 3k and a cooling circulating pipe 3b through a cooling mother liquor pump 3j, and the cooling unit external discharge pipe 3k is connected with an inlet of a multi-effect.
And a flash evaporation discharging pump 2c sends new sodium nitrate into a cooling circulating pipe 3b, the new sodium nitrate and the circulating liquid enter a cooling circulating pump 3c together, the cooling circulating pump 3c sends the sodium nitrate solution into a cooling heat exchanger 3d to be cooled to normal temperature, a large amount of sodium nitrate is crystallized and separated out after the sodium nitrate solution enters a cooling crystallizer 3a, and the overflow of the cooling crystallizer 3a continues to enter the cooling circulating pipe 3b for circulation. The shell pass of the cooling heat exchanger 3d is provided with cooling water circulation by the internal circulation pump 3p, an outlet pipeline of the internal circulation pump 3p is connected with the refrigerant cache barrel 3n, an outlet of the refrigerant cache barrel 3n is connected with an inlet of the refrigerator 3m through a pump, and an outlet of the refrigerator 3m is connected with an inlet pipeline of the internal circulation pump 3p. The cooling water supply pipe G3 is connected to a cooling water inlet of the first freezer 3m, and a cooling water outlet of the first freezer 3m is connected to a cooling water return pipe G4.
And pumping the sodium nitrate crystal slurry at the bottom of the cooling crystallizer 3a by a cooling crystal slurry pump 3e, sending the sodium nitrate crystal slurry into a cooling thickening tank 3f for caching, then sending the sodium nitrate crystal slurry into a cooling centrifuge 3g for solid-liquid separation to obtain high-purity sodium nitrate salt and sodium nitrate centrifugal mother liquor, and sending the obtained sodium nitrate salt into a sodium nitrate drying unit 4 for drying to obtain high-purity sodium nitrate finished salt. The sodium nitrate centrifugal mother liquor, the overflow of the cooling thickening tank 3f and the overflow of the top of the cooling crystallizer 3a enter a cooling mother liquor tank 3h together for collection, the concentration of sodium chloride in the cooling mother liquor tank 3h is 7.6 percent, the concentration of sodium nitrate is 41 percent, the sodium nitrate is pumped out by a cooling mother liquor pump 3j and returns to the inlet of a sodium chloride evaporation crystallization unit 4 from an outer discharge pipe 3k of a cooling unit, and the sodium nitrate can also return to a cooling circulation pipe 3b for circulation or impurity salt preparation. The solubility of the sodium nitrate is reduced along with the reduction of the temperature, and the reduction of the solubility below 20 ℃ is gradual; the system cools the sodium nitrate solution to normal temperature for crystallization, and can improve the production efficiency.
As shown in fig. 2, the sodium nitrate drying unit 4 includes a vibration drying bed 4c, a solid phase outlet of the cooling centrifuge 3g is connected to a feed inlet of the vibration drying bed 4c, a hot air inlet of the vibration drying bed 4c is connected to an outlet of the air heater 4b, a hot air outlet of the vibration drying bed 4c is connected to an air inlet of the cyclone 4d, a bottom discharge port of the cyclone 4d and a discharge port of the vibration drying bed 4c are connected to the sodium nitrate packing device 4g, a top air outlet of the cyclone 4d is connected to an inlet of the water film dust collector 4f through an induced draft fan 4e, and a liquid discharge port of the water film dust collector 4f is connected to an inlet of the cooling mother liquid tank 3h.
And (3) allowing sodium nitrate salt at an outlet of the cooling centrifuge to enter a vibration drying bed 4c for drying, discharging the sodium nitrate salt from the vibration drying bed 4c to obtain finished sodium nitrate salt with the purity of 98%, and packaging the finished sodium nitrate salt in a sodium nitrate packaging device 4g. The product meets the standard of general industrial qualified products in GB/T4553-2016 industrial sodium nitrate and can be sold externally.
The hot side inlet of the air heater 4b is connected to the raw steam pipe G1, and the condensed water discharge port is connected to the condensed water recovery pipe G2. After fresh air is sent into the air heater 4b by the air blower 4a to be heated, hot air enters from the lower part of the vibration drying bed 4c, tail gas is discharged from the top of the vibration drying bed 4c, collected materials also enter into a package after being dedusted by the cyclone dust collector 4d, the tail gas is discharged from the top of the cyclone dust collector 4d, enters into the water film dust collector 4f to be dedusted under the suction of the draught fan 4e, dedusting liquid returns to the cooling mother liquid tank 3h to be circulated, the discharge is stopped, and the materials are recovered.
As shown in fig. 3, an outlet of the cooling unit external discharge pipe 3k is connected with a feed inlet of a mixed salt evaporation kettle 5a, a bottom outlet of the mixed salt evaporation kettle 5a is connected with an inlet of a mixed salt centrifuge 5b, a liquid phase outlet of the mixed salt centrifuge 5b is connected with a mixed salt mother liquor temporary storage tank 5c, an outlet of the mixed salt mother liquor temporary storage tank 5c is connected with a reflux port of the mixed salt evaporation kettle 5a through a mixed salt mother liquor reflux pump 5d, and a solid phase outlet of the mixed salt centrifuge 5b is connected with a mixed salt packaging device 5 e; an exhaust port of the miscellaneous salt evaporation kettle 5a is connected with an inlet of a surface air cooler II 5f, and an outlet of the surface air cooler II 5f is connected with a vacuum pump II 5g.
And the waste mother liquor discharged from the cooling unit outer discharge pipe 3k enters a mixed salt evaporation kettle 5a for evaporation and crystallization, then enters a mixed salt centrifuge 5b for solid-liquid separation, and is packed in a solid phase to obtain the saleable mixed salt. The miscellaneous salt centrifugal mother liquor enters a miscellaneous salt mother liquor temporary storage tank 5c for storage, is pumped out by a miscellaneous salt mother liquor reflux pump 5d and returns to the miscellaneous salt evaporation kettle 5a for circulation; the waste mother liquor is solidified, so that the waste water is completely recycled, and the quality of the main product salt is improved. And under the suction of a second vacuum pump 5g, the exhaust steam of the mixed salt evaporation kettle 5a enters a second surface air cooler 5f for condensation, and the mixed salt evaporation kettle 5a is maintained to accelerate evaporation under vacuum. The condensed water in the jacket of the miscellaneous salt evaporation kettle 5a enters a miscellaneous salt condensed water collecting tank 5h for collection, and is sent to a condensed water recycling pipe G2 for recycling by a miscellaneous salt condensed water pump 5j. The cooling water from the cooling water supply pipe G3 enters the cooling water inlet of the surface cooler two 5f, and the cooling outlet water of the surface cooler two 5f enters the cooling water return pipe G4.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention can also have other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention. The undescribed technical features of the present invention can be realized by or using the prior art, and are not described herein again.
Claims (3)
1. The utility model provides a sodium nitrate solution crystallization system, includes flash distillation charge pump which characterized in that: the outlet of the flash feed pump is connected with the inlet of the flash tank, the top of the flash tank is connected with a sodium nitrate flash pipe, and the bottom outlet of the flash tank is connected with a sodium nitrate cooling and crystallizing unit through a flash discharge pump; the sodium nitrate cooling crystallization unit comprises a cooling crystallizer, a cooling heat exchanger and a cooling circulating pump, wherein the outlet of the flash evaporation discharging pump is connected with the inlet of the cooling circulating pump, the outlet of the cooling circulating pump is connected with the inlet of the cooling heat exchanger, the outlet of the cooling heat exchanger is connected with the feeding pipe of the cooling crystallizer, and the circulating liquid outlet of the cooling crystallizer is connected with the inlet of the cooling circulating pump through a cooling circulating pipe; the outlet of the lower part of the side wall of the cooling crystallizer is connected with the inlet of a cooling crystal slurry pump, the outlet of the cooling crystal slurry pump is connected with a cooling thick tank and the cooling circulating pipe, the outlet of the bottom of the cooling thick tank is connected with the inlet of a cooling centrifuge, the solid-phase outlet of the cooling centrifuge is connected with a sodium nitrate drying unit, the liquid-phase outlet of the cooling centrifuge is connected with the upper overflow port of the cooling crystallizer and the inlet of a cooling mother liquid tank, and the outlet of the cooling mother liquid tank is connected with an outer discharge pipe of the cooling unit and the cooling circulating pipe through a cooling mother liquid pump.
2. The crystallization system of sodium nitrate solution according to claim 1, characterized in that: the dry unit of sodium nitrate includes the vibration drying bed, cooling centrifuge's solid phase export with the feed inlet of vibration drying bed links to each other, the hot-blast import of vibration drying bed links to each other with air heater's export, the hot air exitus of vibration drying bed links to each other with cyclone's air intake, cyclone's bottom discharge gate with the discharge gate of vibration drying bed links to each other with sodium nitrate baling equipment jointly, cyclone's top air outlet passes through the entry of draught fan with water film dust remover and links to each other, water film dust remover's leakage fluid dram with the entry of cooling mother liquor jar links to each other.
3. The crystallization system of sodium nitrate solution according to claim 1 or 2, characterized in that: the outlet of the cooling unit outer discharge pipe is connected with the feed inlet of a mixed salt evaporation kettle, the outlet at the bottom of the mixed salt evaporation kettle is connected with the inlet of a mixed salt centrifuge, the liquid-phase outlet of the mixed salt centrifuge is connected with a mixed salt mother liquor temporary storage tank, the outlet of the mixed salt mother liquor temporary storage tank is connected with the reflux port of the mixed salt evaporation kettle through a mixed salt mother liquor reflux pump, and the solid-phase outlet of the mixed salt centrifuge is connected with a mixed salt packaging device; and an exhaust port of the miscellaneous salt evaporation kettle is connected with an inlet of a surface air cooler II, and an outlet of the surface air cooler II is connected with a vacuum pump II.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113998825A (en) * | 2021-10-12 | 2022-02-01 | 铜陵有色金属集团股份有限公司 | Sodium nitrate evaporative crystallization device and application method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113998825A (en) * | 2021-10-12 | 2022-02-01 | 铜陵有色金属集团股份有限公司 | Sodium nitrate evaporative crystallization device and application method thereof |
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