CN215403124U - Comprehensive utilization system for preparing sodium carbonate from sodium sulfate - Google Patents
Comprehensive utilization system for preparing sodium carbonate from sodium sulfate Download PDFInfo
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- CN215403124U CN215403124U CN202121251765.4U CN202121251765U CN215403124U CN 215403124 U CN215403124 U CN 215403124U CN 202121251765 U CN202121251765 U CN 202121251765U CN 215403124 U CN215403124 U CN 215403124U
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Abstract
The utility model provides a comprehensive utilization system of sodium sulfate preparation soda ash, including ammonium bicarbonate dissolving device, sodium sulfate dissolving device, reaction unit, solid-liquid separation equipment, washing unit, sodium bicarbonate preparation facilities, MVR evaporation plant and ammonium sulfate separator, ammonium bicarbonate dissolving device, the play liquid end of sodium sulfate dissolving device both all communicates with reaction unit, reaction unit's play liquid end and solid-liquid separation equipment's feed liquor end intercommunication, solid-liquid separation equipment respectively with washing unit, MVR evaporation plant realizes the intercommunication, sodium bicarbonate processing apparatus establishes in one side position department of washing unit, MVR evaporation plant is formed with mother liquor play liquid end and comdenstion water play liquid end, mother liquor play liquid end and ammonium sulfate separator intercommunication, comdenstion water play liquid end and sodium sulfate dissolving device intercommunication, ammonium sulfate separator's play liquid end and sodium sulfate dissolving device intercommunication. The structure is simple, the closed cycle is realized without waste liquid discharge, the environmental pollution is reduced, and the purposes of energy conservation, environmental protection and resource recycling are embodied.
Description
Technical Field
The utility model belongs to the technical field of resource recycling, and particularly relates to a comprehensive utilization system for preparing sodium carbonate from sodium sulfate.
Background
Various industrial byproducts and a large amount of industrial high-salinity wastewater are generated in the production process of the chemical industry, the industrial byproducts are important chemical basic raw materials, the sodium sulfate is a huge-storage industrial byproduct, the sodium sulfate is also called anhydrous sodium sulphate, and crystal water is mirabilite which is mainly generated in the processes of flue gas desulfurization, wastewater treatment and the like. The industrial high-salt wastewater has the characteristics of high COD (chemical oxygen demand), high ammonia nitrogen, high heavy metal content and difficult degradation, and if the industrial high-salt wastewater is directly discharged, severe environment damage is caused, so the high-salt wastewater needs to be subjected to a series of physical and chemical treatments, a large amount of salt mud is generated after the treatment, and the components of the salt mud are mainly sodium chloride and a large amount of sodium sulfate. However, because sodium sulfate products have small market demand and few effective resource utilization ways, most of the existing treatment methods mainly use stockpiling, which not only occupies precious land resources and causes resource waste, but also forms potential risk factors for the environment, because sodium sulfate is easily dissolved in water, sodium sulfate solids generated by some enterprises also contain a large amount of heavy metals such as vanadium, chromium, zinc and the like, and if the sodium sulfate solids are directly stockpiled without purification treatment, sodium sulfate solution containing a large amount of heavy metals flows outwards in rainy days, which pollutes precious water resources and soil, causes salinity of water and soil to rise, causes acidification of the water and reduction of pH, causes soil hardening, is not beneficial to growth of animals and plants, reduces crop yield and reduces quality of agricultural products; the sodium carbonate is an important chemical raw material, has the chemical name of sodium carbonate and the common name of soda, is white powder under the ordinary condition, is easy to dissolve in water, can be widely applied to industrial departments such as building materials, light industry, chemical industry, metallurgy, textile and the like, and is also an indispensable raw material for washing, acid neutralization and food processing in daily life of people; the method has quite wide development space and economic benefit if sodium sulfate can be used as a reaction raw material to prepare the calcined soda.
In view of the above, it is necessary to design a treatment system capable of efficiently recycling sodium sulfate. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a comprehensive utilization system for preparing sodium carbonate from sodium sulfate, which has a simple structure, realizes closed cycle without waste liquid discharge, is beneficial to preparing ammonium sulfate and sodium bicarbonate by taking industrial byproducts and sodium sulfate generated by waste water treatment as raw materials to react with an ammonium bicarbonate solution, and can further prepare sodium carbonate so as to reduce environmental pollution and embody the purposes of energy conservation, environmental protection and resource recycling.
The utility model aims to accomplish the task in such a way that a comprehensive utilization system for preparing sodium carbonate from sodium sulfate comprises an ammonium bicarbonate dissolving device, a sodium sulfate dissolving device, a reaction device, a solid-liquid separation device, a water washing device, a sodium bicarbonate preparation device, an MVR evaporation device and an ammonium sulfate separation device, wherein the liquid outlet ends of the ammonium bicarbonate dissolving device and the sodium sulfate dissolving device are communicated with the reaction device, the liquid outlet end of the reaction device is also communicated with the liquid inlet end of the solid-liquid separation device, the solid-liquid separation device is respectively communicated with the water washing device and the MVR evaporation device, the sodium bicarbonate treatment device is arranged at one side of the water washing device, the MVR evaporation device is provided with a mother liquid outlet end and a condensed water outlet end, the mother liquid outlet end of the mother liquid is communicated with the ammonium sulfate separation device, and the condensed water outlet end is communicated with the sodium sulfate dissolving device, and the liquid outlet end of the ammonium sulfate separation device is communicated with the sodium sulfate dissolving device.
In a specific embodiment of the utility model, the ammonium bicarbonate dissolving device comprises an ammonium bicarbonate dissolving kettle, an ammonium bicarbonate solution stirrer and an ammonium bicarbonate solution conveying pipeline, the ammonium bicarbonate solution stirrer extends into an internal hollow cavity of the ammonium bicarbonate dissolving kettle and can stir the solution, the ammonium bicarbonate solution conveying pipeline is arranged at a position close to the bottom end of the ammonium bicarbonate dissolving kettle in the height direction and communicates the ammonium bicarbonate dissolving kettle with the reaction device, an ammonium bicarbonate solution lifting pump, an ammonium bicarbonate solution regulating valve and an ammonium bicarbonate solution flow meter are sequentially arranged on the ammonium bicarbonate solution conveying pipeline, the ammonium bicarbonate solution lifting pump can pressurize and convey the solution in the ammonium bicarbonate dissolving kettle into the reaction device, and the ammonium bicarbonate solution flow meter can detect the flow rate of fluid in the ammonium bicarbonate solution conveying pipeline, and ammonium bicarbonate solution governing valve, ammonium bicarbonate solution flowmeter all realize electric connection with an ammonium bicarbonate solution controlling means, and ammonium bicarbonate solution flowmeter can be to ammonium bicarbonate solution controlling means output flow electromagnetic signal, and ammonium bicarbonate solution controlling means can to thereby ammonium bicarbonate solution governing valve output electromagnetic signal makes ammonium bicarbonate solution governing valve control flap switch volume adjustment solution flow.
In another specific embodiment of the present invention, the sodium sulfate dissolving apparatus includes a sodium sulfate dissolving kettle, a sodium sulfate solution stirrer and a sodium sulfate solution delivery pipe, the sodium sulfate solution stirrer protrudes into the hollow cavity inside the sodium bicarbonate dissolving kettle and can stir the solution, the sodium sulfate solution delivery pipe is disposed near the bottom end of the sodium sulfate dissolving kettle in the height direction and communicates the sodium sulfate dissolving kettle with the reaction apparatus, a sodium sulfate solution lift pump, a sodium sulfate solution regulating valve and a sodium sulfate solution flow meter are sequentially disposed on the sodium sulfate solution delivery pipe, the sodium sulfate solution lift pump can pressurize and deliver the solution in the sodium sulfate dissolving kettle to the reaction apparatus, and the sodium sulfate solution flow meter can detect the flow rate of the fluid in the sodium sulfate solution delivery pipe, and the sodium sulfate solution regulating valve and the sodium sulfate solution flowmeter are electrically connected with a sodium sulfate solution control device, the sodium sulfate solution flowmeter can output flow electromagnetic signals to the sodium sulfate solution control device, and the sodium sulfate solution control device can output electromagnetic signals to the sodium sulfate solution regulating valve so that the sodium sulfate solution regulating valve controls the valve opening and closing amount to adjust the solution flow.
In another specific embodiment of the present invention, the reaction apparatus includes a reaction kettle and a reaction stirrer, the reaction stirrer is inserted into a hollow cavity inside the reaction kettle and can stir the internal mixed solution, a temperature meter capable of detecting the internal temperature of the hollow cavity is disposed in the hollow cavity of the reaction kettle, a reaction kettle steam inlet is disposed near the bottom end of the reaction kettle body in the height direction, a steam conveying pipeline capable of conveying steam into the hollow cavity inside the reaction kettle is connected to the reaction kettle steam inlet, a steam regulating valve is disposed on the steam conveying pipeline, the temperature meter and the steam regulating valve are electrically connected to a temperature control device, the temperature meter can feed back electromagnetic signals converted from the temperature data inside the reaction kettle to the temperature control device in real time, and the steam regulating valve can control the valve switching value according to the signal fed back by the temperature control device to regulate the steam flow entering the hollow cavity of the reaction kettle in the steam conveying pipeline, so as to control the temperature in the reaction kettle.
In another specific embodiment of the present invention, the solid-liquid separation device includes a refrigerator and a high-pressure plate frame device which are communicated with each other through a pipeline, the refrigerator is communicated with the reaction kettle of the reaction device through a pipeline, the high-pressure plate frame device includes a salt cake output end and a filtrate outlet end, the salt cake output end is communicated with the input end of the water washing device through a pipeline, and the filtrate outlet end is communicated with the liquid inlet end of the MVR evaporation device through a pipeline.
In a further specific embodiment of the present invention, the water washing device includes a water washing tank, a water washing stirrer and a precipitation tank, the water washing tank and the precipitation tank are communicated with each other, the water washing stirrer extends into the hollow cavity of the water washing tank and can perform stirring operation, and a purified water inlet is formed at an upper portion of the water washing tank.
In a further embodiment of the present invention, the sodium bicarbonate treatment device comprises a dryer capable of preparing sodium bicarbonate and a calciner capable of preparing sodium carbonate.
In a more specific embodiment of the present invention, the ammonium sulfate separation device includes a temperature reduction device and a centrifuge, which are communicated with each other, a liquid inlet end of the temperature reduction device is communicated with a mother liquid outlet end of the MVR evaporation device through a pipeline, a liquid inlet end of the centrifuge is communicated with a liquid outlet end of the temperature reduction device through a pipeline, a reflux end and an ammonium sulfate solid output end are formed on the centrifuge, the reflux end is communicated with a sodium sulfate dissolution kettle of the sodium sulfate dissolution device through a pipeline, and the centrifuge outputs a finished product ammonium sulfate solid from the ammonium sulfate solid output end.
The technical scheme provided by the utility model has the technical effects that: the industrial byproduct sodium sulfate is used as a raw material and is reacted with ammonium bicarbonate to prepare an ammonium sulfate product and a sodium bicarbonate product, the ammonium sulfate product can be used as industrial waste, the sodium bicarbonate product can be reprocessed and calcined to prepare a finished product sodium carbonate, namely a soda ash product, the produced ammonium sulfate and sodium bicarbonate products have high additional values, wide market application prospects and high sodium sulfate conversion rate, the number of devices of the whole system is small, the comprehensive energy consumption and operation cost of preparation and production are reduced, meanwhile, closed-loop circulation without waste liquid discharge is realized, the high-efficiency treatment and resource utilization of the industrial byproduct sodium sulfate are realized, and the purposes of energy conservation, environmental protection and resource recycling are achieved.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.
In the figure: 1. the system comprises an ammonium bicarbonate dissolving device, 11 ammonium bicarbonate dissolving kettles, 12 ammonium bicarbonate solution stirrers, 13 ammonium bicarbonate solution conveying pipelines, 14 ammonium bicarbonate solution lifting pumps, 15 ammonium bicarbonate solution regulating valves, 16 ammonium bicarbonate solution flow meters and 17 ammonium bicarbonate solution control devices; 2. the device comprises a sodium sulfate dissolving device, 21 sodium sulfate dissolving kettles, 22 sodium sulfate solution stirrers, 23 sodium sulfate solution conveying pipelines, 24 sodium sulfate solution lifting pumps, 25 sodium sulfate solution regulating valves, 26 sodium sulfate solution flowmeters and 27 sodium sulfate solution control devices; 3. the system comprises a reaction device, 31, a reaction kettle, 311, a reaction kettle steam inlet, 32, a reaction stirrer, 33, a temperature instrument, 34, a steam conveying pipeline, 35, a steam regulating valve and 36, a temperature control device; 4. the system comprises a solid-liquid separation device, a refrigerator 41, a high-pressure plate frame device 42, a salt cake output end 421, a filtrate liquid outlet end 422, a high-pressure plate frame device, a high-pressure plate-solid separation device, a high-solid separation device, a high-solid separation device, high-solid separation device, a high-solid separation device, a high-solid separation device, high-solid separation device, a high-solid separation device, high-solid separation device, a high-solid separation device, high-solid separation device, a high-; 5. a water washing device, 51, a water washing tank, 511, a purified water adding port, 52, a water washing stirrer and 53, a settling tank; 6. a sodium bicarbonate preparation device, 61, a dryer and 62, a calcining furnace; 7, an MVR evaporation device, 71, a mother liquid outlet end, 72, a condensed water outlet end; 8. ammonium sulfate separator, 81 cooling equipment, 82 centrifuge, 821 reflux end, 822 ammonium sulfate solid output end.
Detailed Description
In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, should be considered as the technical scope of the present invention.
In the following description, any concept related to the directions or orientations of up, down, left, right, front and rear is based on the position state of fig. 1, and thus it should not be understood as a specific limitation to the technical solution provided by the present invention.
Referring to fig. 1, a comprehensive utilization system for preparing sodium carbonate from sodium sulfate is shown, which comprises an ammonium bicarbonate dissolving device 1, a sodium sulfate dissolving device 2, a reaction device 3, a solid-liquid separation device 4, a water washing device 5, a sodium bicarbonate preparation device 6, an MVR evaporation device 7 and an ammonium sulfate separation device 8, wherein liquid outlet ends of the ammonium bicarbonate dissolving device 1 and the sodium sulfate dissolving device 2 are communicated with the reaction device 3, a liquid outlet end of the reaction device 3 is also communicated with a liquid inlet end of the solid-liquid separation device 4, the solid-liquid separation device 4 is respectively communicated with the water washing device 5 and the MVR evaporation device 7, the sodium bicarbonate treatment device 6 is arranged at a position at one side of the water washing device 5, the MVR evaporation device 7 is provided with a mother liquid outlet end 71 and a condensed water outlet end 72, the mother liquid outlet end 71 is communicated with the ammonium sulfate separation device 8, the condensed water outlet 72 is connected to the sodium sulfate dissolving device 2, and the ammonium sulfate separating device 8 is connected to the sodium sulfate dissolving device 2.
In this embodiment, the ammonium bicarbonate dissolving apparatus 1 comprises an ammonium bicarbonate dissolving kettle 11, an ammonium bicarbonate solution stirring machine 12 and an ammonium bicarbonate solution delivery pipe 13, the ammonium bicarbonate solution stirring machine 12 extends into the hollow cavity inside the sodium bicarbonate dissolving kettle 11 and can stir the solution, the ammonium bicarbonate solution delivery pipe 13 is disposed near the bottom end of the ammonium bicarbonate dissolving kettle 11 in the height direction and connects the ammonium bicarbonate dissolving kettle 11 with the reaction apparatus 3, an ammonium bicarbonate solution lift pump 14, an ammonium bicarbonate solution regulating valve 15 and an ammonium bicarbonate solution flow meter 16 are sequentially disposed on the ammonium bicarbonate solution delivery pipe 13, the ammonium bicarbonate solution lift pump 14 can pressurize and deliver the solution in the ammonium bicarbonate dissolving kettle 11 into the reaction apparatus 3, and the ammonium bicarbonate solution flow meter 16 can detect the flow rate of the fluid in the ammonium bicarbonate solution delivery pipe 13, and the ammonium bicarbonate solution regulating valve 15 and the ammonium bicarbonate solution flow meter 16 are electrically connected with an ammonium bicarbonate solution control device 17, the ammonium bicarbonate solution flow meter 16 can output a flow electromagnetic signal to the ammonium bicarbonate solution control device 17, and the ammonium bicarbonate solution control device 17 can output an electromagnetic signal to the ammonium bicarbonate solution regulating valve 15, so that the ammonium bicarbonate solution regulating valve 15 controls the valve switching value to adjust the solution flow.
Further, the sodium sulfate dissolving apparatus 2 includes a sodium sulfate dissolving tank 21, a sodium sulfate solution stirrer 22, and a sodium sulfate solution transfer pipe 23, the sodium sulfate solution stirrer 22 is inserted into the hollow cavity inside the sodium bicarbonate dissolving tank 21 and can stir the solution, the sodium sulfate solution transfer pipe 23 is provided at a position near the bottom end of the sodium sulfate dissolving tank 21 in the height direction and communicates the sodium sulfate dissolving tank 21 with the reaction apparatus 3, a sodium sulfate solution lift pump 24, a sodium sulfate solution regulating valve 25, and a sodium sulfate solution flowmeter 26 are sequentially provided in the sodium sulfate solution transfer pipe 23, the sodium sulfate solution lift pump 24 can pressurize and transfer the solution in the sodium sulfate dissolving tank 22 into the reaction apparatus 3, and the sodium sulfate solution flowmeter 26 can detect the flow rate of the fluid in the sodium sulfate solution transfer pipe 23, the sodium sulfate solution regulating valve 25 and the sodium sulfate solution flowmeter 26 are electrically connected to a sodium sulfate solution control device 27, the sodium sulfate solution flowmeter 26 can output an electromagnetic flow signal to the sodium sulfate solution control device 27, and the sodium sulfate solution control device 27 can output an electromagnetic signal to the sodium sulfate solution regulating valve 25 so that the sodium sulfate solution regulating valve 25 controls the valve opening/closing amount to adjust the solution flow rate.
In the present embodiment, the ammonium bicarbonate solution regulating valve 15 and the sodium sulfate solution regulating valve 25 are preferably ZDLP-16P electric regulating valves manufactured by zhejiang fluid equipment ltd, and the ammonium bicarbonate solution flowmeter 16 and the sodium sulfate solution flowmeter 26 are preferably LDG-MK electromagnetic flowmeters manufactured by hangzhou america automation technology ltd, and the ammonium bicarbonate solution flowmeter 16 and the sodium sulfate solution flowmeter 26 both have output signals of 4 to 20 mA.
Further, the reaction apparatus 3 includes a reaction kettle 31 and a reaction stirrer 32, the reaction stirrer 32 is inserted into a hollow cavity inside the reaction kettle 31 and can stir the mixed solution therein, the reaction stirrer 32 can make the reaction between the saturated ammonium bicarbonate solution and the saturated sodium sulfate solution more sufficient, a temperature meter 33 capable of detecting the internal temperature of the hollow cavity is arranged in the hollow cavity of the reaction kettle 31, a reaction kettle steam inlet 311 is arranged at a position near the bottom end of the reaction kettle 31 in the height direction, a steam conveying pipe 34 capable of conveying steam into the hollow cavity inside the reaction kettle 31 is connected to the reaction kettle steam inlet 311, a steam regulating valve 35 is arranged on the steam conveying pipe 34, the temperature meter 33 and the steam regulating valve 35 are both electrically connected with a temperature control device 36, the temperature meter 33 can feed back electromagnetic signals converted from the temperature data in the reaction kettle 31 to the temperature control device 36 in real time, and the steam regulating valve 35 can control the valve switching value according to the signals fed back by the temperature control device 36 to regulate the steam flow entering the hollow cavity of the reaction kettle 31 in the steam conveying pipeline 34, so as to control the temperature in the reaction kettle 31.
With reference to fig. 1, the solid-liquid separation device 4 includes a freezer 41 and a high-pressure plate frame device 42 which are communicated with each other through a pipeline, the freezer 41 is communicated with the reaction kettle 31 of the reaction device 3 through a pipeline, the high-pressure plate frame device 42 includes a salt cake output end 421 and a filtrate outlet end 422, the salt cake output end 421 is communicated with the input end of the water washing device 5 through a pipeline, and the filtrate outlet end 422 is communicated with the liquid inlet end of the MVR evaporation device 7 through a pipeline.
In this embodiment, the washing apparatus 5 includes a washing tank 51, a washing stirrer 52 and a settling tank 53, the washing tank 51 and the settling tank 53 are communicated with each other, the washing stirrer 52 extends into a hollow cavity of the washing tank 51 to perform a stirring operation, and a purified water inlet 511 is opened at an upper portion of a body of the washing tank 51.
Further, the sodium bicarbonate treatment device 6 comprises a dryer 61 capable of preparing finished sodium bicarbonate and a calciner 62 capable of preparing finished sodium carbonate, the main reaction in the calciner 62 is to decompose sodium bicarbonate solid into sodium carbonate, carbon dioxide and water, and qualified sodium carbonate soda ash products can be generated, and the calciner 62 can be one of an external heating type rotary calciner, a steam calciner (internal heating type rotary kiln) or a boiling calciner (fluidized bed).
In this embodiment, the MVR evaporation device 7 is a device that employs a Mechanical Vapor Recompression (MVR) technology, which is a mechanical vapor recompression technology that uses secondary vapor generated by an evaporation system itself and energy thereof to increase low-grade vapor to a high-grade vapor heat source by mechanical work of a compressor, and the MVR evaporation device 7 can evaporate and separate the mixed filtrate separated in the solid-liquid separation device 4 into condensed water and mixed mother liquor containing ammonium sulfate and sodium sulfate and ammonium bicarbonate that are not completely reacted. The MVR evaporation plant can preferably select the high-efficiency energy-saving MVR evaporator produced by the Xishan snow wave chemical equipment factory in the Wuxi city.
Further, the ammonium sulfate separation device 8 includes a temperature reduction device 81 and a centrifuge 82 which are communicated with each other, a liquid inlet end of the temperature reduction device 81 is communicated with a mother liquid outlet end 71 of the MVR evaporation device 7 through a pipeline, a liquid inlet end of the centrifuge 82 is communicated with a liquid outlet end of the temperature reduction device 81 through a pipeline, a backflow end 821 and an ammonium sulfate solid output end 822 are formed on the centrifuge 82, the backflow end 821 is communicated with the sodium sulfate dissolving kettle 21 of the sodium sulfate dissolving device 2 through a pipeline, and the centrifuge 82 outputs an ammonium sulfate solid product from the ammonium sulfate solid output end 822.
Referring to fig. 1, the applicant briefly describes the working principle of the technical solution provided by the utility model: firstly, a worker adds solid ammonium bicarbonate into an ammonium bicarbonate dissolving kettle 11 of an ammonium bicarbonate dissolving device 1, adds purified water and starts an ammonium bicarbonate solution stirrer 12 to dissolve the solid ammonium bicarbonate to prepare a saturated ammonium bicarbonate solution, then adds solid sodium sulfate obtained by processing industrial byproducts or industrial wastewater into a sodium sulfate dissolving kettle 21 of a sodium sulfate dissolving device 2, adds purified water and starts a sodium sulfate solution stirrer 22 to dissolve the solid sodium sulfate to form a saturated sodium sulfate solution, then starts a sodium sulfate solution lift pump 24 to convey the saturated sodium sulfate solution into a reaction kettle 31 of the reaction device 3 through a sodium sulfate solution conveying pipeline 23, starts a reaction stirrer 32 after the saturated sodium sulfate solution is added to a set liquid level of the reaction kettle 31, starts an ammonium bicarbonate solution lift pump 14 to slowly add the saturated ammonium bicarbonate solution into the reaction kettle 3, and controls the steam inlet amount through a steam regulating valve 35 to regulate the temperature inside the reaction kettle 31, the saturated solution of ammonium bicarbonate and the saturated solution of sodium sulfate are subjected to chemical reaction in a reaction kettle 31, and the specific reaction principle is as follows: na (Na)2SO4+2NH4HCO3→2NaHCO3+(NH4)2SO4On the contraryThe reaction temperature is preferably 35-40 ℃, and the reaction time is preferably 1.5-2.0 h; the mixed solution generated by the reaction contains sodium bicarbonate and ammonium sulfate, the mixed solution enters a refrigerator 41 of a solid-liquid separation device 4 for freezing and cooling treatment, the cooled mixed solution enters high-pressure plate-frame equipment for solid-liquid separation, a solid salt cake containing sodium bicarbonate and a filtrate containing ammonium sulfate are formed after separation, the solid salt cake enters a water washing tank 51 of a water washing device 5 through a salt cake output end 421, purified water is added into a purified water adding port 511 of the water washing tank 51 at the moment, a water washing stirrer 52 is started to generate a saturated sodium bicarbonate solution, the saturated ammonium bicarbonate solution further flows into a precipitation tank 53 for precipitation, the sodium bicarbonate solid generated after precipitation can be fished out and conveyed to a dryer 61 of a sodium bicarbonate preparation device 6 for drying treatment to prepare a finished sodium bicarbonate solid product, and the sodium bicarbonate solid generated after precipitation can also be conveyed to a calciner 62 for calcining treatment to prepare a sodium carbonate solid product Preparing a product; the filtrate pressed out by the high-pressure plate frame device 42 enters the MVR evaporation device 7 for evaporation crystallization treatment, the condensed water formed after evaporation crystallization is conveyed to the sodium sulfate dissolving kettle of the sodium sulfate dissolving device 2 again through the condensed water outlet end 72 for water supplement, the mother liquor containing ammonium sulfate formed after evaporation crystallization enters the cooling equipment 81 of the ammonium sulfate separation device 8 through the mother liquor outlet end for cooling, the mother liquor after temperature reduction enters a centrifuge 82 for centrifugal solid-liquid separation operation, solid ammonium sulfate and mixed solution containing sodium sulfate and ammonium bicarbonate are formed after separation, the solid ammonium sulfate can be output outwards through an ammonium sulfate solid output end 822 for subsequent treatment as agricultural fertilizer, the mixed solution containing sodium sulfate and ammonium bicarbonate flows into the sodium sulfate solution kettle 21 of the sodium sulfate dissolving device 2 through the return end 821 for recycling.
In conclusion, the technical scheme provided by the utility model overcomes the defects in the prior art, successfully completes the utility model task and truly realizes the technical effects of the applicant in the technical effect column.
Claims (8)
1. A comprehensive utilization system for preparing sodium carbonate from sodium sulfate is characterized in that: comprises an ammonium bicarbonate dissolving device (1), a sodium sulfate dissolving device (2), a reaction device (3), a solid-liquid separation device (4), a washing device (5), a sodium bicarbonate preparation device (6), an MVR evaporation plant (7) and an ammonium sulfate separation device (8), wherein the liquid outlet ends of the ammonium bicarbonate dissolving device (1) and the sodium sulfate dissolving device (2) are communicated with the reaction device (3), the liquid outlet end of the reaction device (3) is communicated with the liquid inlet end of the solid-liquid separation device (4), the solid-liquid separation device (4) is communicated with the washing device (5) and the MVR evaporation plant (7) respectively, the sodium bicarbonate treatment device (6) is arranged at one side position of the washing device (5), and the MVR evaporation device (7) is formed with a mother liquid outlet end (71) and a condensed water outlet end (72), the mother liquor outlet end (71) is communicated with the ammonium sulfate separation device (8), the condensed water outlet end (72) is communicated with the sodium sulfate dissolving device (2), and the outlet end of the ammonium sulfate separation device (8) is also communicated with the sodium sulfate dissolving device (2).
2. The comprehensive utilization system for preparing soda ash from sodium sulfate according to claim 1, wherein the ammonium bicarbonate dissolving device (1) comprises an ammonium bicarbonate dissolving kettle (11), an ammonium bicarbonate solution stirring machine (12) and an ammonium bicarbonate solution conveying pipeline (13), the ammonium bicarbonate solution stirring machine (12) extends into the hollow cavity inside the ammonium bicarbonate dissolving kettle (11) and can stir the solution, the ammonium bicarbonate solution conveying pipeline (13) is arranged at a position near the bottom end of the ammonium bicarbonate dissolving kettle (11) in the height direction and communicates the ammonium bicarbonate dissolving kettle (11) with the reaction device (3), and an ammonium bicarbonate solution lifting pump (14), an ammonium bicarbonate solution regulating valve (15) and an ammonium bicarbonate solution flow meter (16) are arranged on the ammonium bicarbonate solution conveying pipeline (13) in sequence, ammonium bicarbonate solution elevator pump (14) can dissolve the solution pressure boost in the cauldron (11) with ammonium bicarbonate and carry in reaction unit (3), and ammonium bicarbonate solution flowmeter (16) can detect the interior fluid flow of ammonium bicarbonate solution pipeline (13), and ammonium bicarbonate solution governing valve (15), ammonium bicarbonate solution flowmeter (16) all realize electrical connection with an ammonium bicarbonate solution controlling means (17), and ammonium bicarbonate solution flowmeter (16) can export flow electromagnetic signal to ammonium bicarbonate solution controlling means (17), and ammonium bicarbonate solution controlling means (17) can to thereby ammonium bicarbonate solution governing valve (15) output electromagnetic signal makes ammonium bicarbonate solution governing valve (15) control valve switching value adjustment solution flow.
3. The comprehensive utilization system for preparing soda ash from sodium sulfate according to claim 1, wherein the sodium sulfate dissolving device (2) comprises a sodium sulfate dissolving kettle (21), a sodium sulfate solution stirrer (22) and a sodium sulfate solution conveying pipeline (23), the sodium sulfate solution stirrer (22) extends into the hollow cavity inside the sodium bicarbonate dissolving kettle (21) and can stir the solution, the sodium sulfate solution conveying pipeline (23) is arranged at a position near the bottom end of the sodium sulfate dissolving kettle (21) in the height direction and communicates the sodium sulfate dissolving kettle (21) with the reaction device (3), a sodium sulfate solution lifting pump (24), a sodium sulfate solution regulating valve (25) and a sodium sulfate solution flowmeter (26) are sequentially arranged on the sodium sulfate solution conveying pipeline (23), and the sodium sulfate solution lifting pump (24) can pressurize and convey the solution in the sodium sulfate dissolving kettle (22) to the reverse side The device (3) is characterized in that the sodium sulfate solution flowmeter (26) can detect the flow rate of fluid in the sodium sulfate solution conveying pipeline (23), the sodium sulfate solution regulating valve (25) and the sodium sulfate solution flowmeter (26) are electrically connected with a sodium sulfate solution control device (27), the sodium sulfate solution flowmeter (26) can output flow electromagnetic signals to the sodium sulfate solution control device (27), and the sodium sulfate solution control device (27) can output electromagnetic signals to the sodium sulfate solution regulating valve (25) so that the sodium sulfate solution regulating valve (25) controls the valve opening and closing amount to adjust the solution flow rate.
4. The comprehensive utilization system for preparing soda ash from sodium sulfate according to claim 1, wherein the reaction device (3) comprises a reaction kettle (31) and a reaction stirrer (32), the reaction stirrer (32) extends into the hollow cavity inside the reaction kettle (31) and can stir the internal mixed solution, a temperature instrument (33) capable of detecting the internal temperature of the hollow cavity is arranged in the hollow cavity of the reaction kettle (31), a reaction kettle steam inlet (311) is arranged at a position near the bottom end of the kettle body of the reaction kettle (31) in the height direction, a steam conveying pipeline (34) capable of conveying steam into the hollow cavity inside the reaction kettle (31) is connected to the reaction kettle steam inlet (311), and a steam regulating valve (35) is arranged on the steam conveying pipeline (34), temperature appearance (33), steam control valve (35) all realize electric connection with a temperature control device (36), and this temperature appearance (33) can feed back the electromagnetic signal that the inside temperature data of reation kettle (31) converted to temperature control device (36) in real time, just steam control valve (35) can be according to the signal control valve switching value adjustment that temperature control device (36) fed back steam delivery pipeline (34) inside the steam flow of entering the cavity of reation kettle (31) to control the inside temperature of reation kettle (31).
5. The comprehensive utilization system for preparing soda ash from sodium sulfate according to claim 1, wherein the solid-liquid separation device (4) comprises a refrigerator (41) and a high-pressure plate frame device (42) which are communicated with each other through a pipeline, the refrigerator (41) is communicated with the reaction kettle (31) of the reaction device (3) through a pipeline, the high-pressure plate frame device (42) comprises a salt cake output end (421) and a filtrate outlet end (422), the salt cake output end (421) is communicated with the input end of the water washing device (5) through a pipeline, and the filtrate outlet end (422) is communicated with the liquid inlet end of the MVR evaporation device (7) through a pipeline.
6. The comprehensive utilization system for preparing soda ash from sodium sulfate according to claim 1, characterized in that the water washing device (5) comprises a water washing tank (51), a water washing stirrer (52) and a settling tank (53), the water washing tank (51) and the settling tank (53) are communicated with each other, the water washing stirrer (52) is inserted into a hollow cavity of the water washing tank (51) and can be stirred, and a purified water inlet (511) is formed in the upper part of the tank body of the water washing tank (51).
7. The comprehensive utilization system for sodium sulfate-based soda ash production according to claim 1, wherein said sodium bicarbonate treatment device (6) comprises a dryer (61) capable of producing sodium bicarbonate and a calciner (62) capable of producing sodium carbonate.
8. The comprehensive utilization system for preparing soda ash from sodium sulfate according to claim 1, wherein the ammonium sulfate separation device (8) comprises a temperature reduction device (81) and a centrifuge (82) which are communicated with each other, a liquid inlet end of the temperature reduction device (81) is communicated with a mother liquor outlet end (71) of the MVR evaporation device (7) through a pipeline, a liquid inlet end of the centrifuge (82) is communicated with a liquid outlet end of the temperature reduction device (81) through a pipeline, a reflux end (821) and an ammonium sulfate solid output end (822) are formed on the centrifuge (82), the reflux end (821) is communicated with a sodium sulfate dissolving kettle (21) of the sodium sulfate dissolving device (2) through a pipeline, and the centrifuge (82) outputs a finished product ammonium sulfate solid from the ammonium sulfate solid output end (822).
Priority Applications (1)
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