Airflow oscillation regeneration device and method for treating solid hazardous waste salt

Abstract

The invention discloses an airflow oscillation regeneration device and method for treating solid hazardous waste salt. The method comprises a sodium precipitation system, an ammonium chloride precipitation system, a baking soda roughing system, a deamination system and a baking soda refining system. The method comprises the following steps: preparing sodium chloride slurry from industrial waste salt, and performing sodium precipitation, dehydration, cold precipitation, salting-out, dehydration and centrifugal packaging to obtain ammonium chloride; carrying out reaction absorption on the mother solution obtained by preparing ammonium chloride under the action of airflow oscillation of CO2 to generate a preparation solution; stirring and mixing the prepared solution and ammonium bicarbonate slurry, mixing and reacting under the airflow oscillation action of CO2 to generate coarse baking soda, mixing the coarse baking soda with solids separated by sodium precipitation and mother liquor obtained by preparing ammonium chloride for deamination, and dehydrating, centrifuging and drying to obtain refined baking soda. The reaction conversion rate of the solid hazardous waste salt can be increased, and the baking soda quality is improved.

Description

Technical Field

[0001] The invention belongs to the field of waste treatment applications, and in particular relates to an airflow oscillation regeneration device and method for treating solid hazardous waste salt. Background Art

[0002] According to incomplete statistics, the annual production of hazardous solid waste salt in the fine chemical industry, high-concentration wastewater, printing and dyeing, pharmaceuticals, pesticides, metallurgical industry, phosphorus chemical industry, new energy and other industries, lithium iron phosphate, ternary cathode materials, coal chemical industry and coal chemical industry is more than 30 million tons / year, and the hazardous solid waste salt itself contains a variety of harmful substances. If it is not fully treated, the hazardous solid waste salt containing complex organic matter will pose a serious threat to the environment; and the hazardous solid waste salt containing complex organic matter is also a concentrated resource, and its degree of danger and environmental damage are not necessarily greater than other chemical products, but as long as it is in accordance with the regulatory requirements and the resource disposal process is reasonably designed, it can not only produce huge social benefits, but also significant economic benefits.

[0003] At present, the main methods for the disposal of solid and hazardous waste salt in China are: landfill method, high temperature oxidation method, salt washing method, etc. The landfill method has the following problems: high investment, large land occupation, soil pollution; few rigid landfills; high landfill costs, each ton of waste salt costs 2,500 to 4,000 yuan in different regions, which is unaffordable for most companies, and solid and hazardous waste salt contains many valuable chemical resources, which are not reasonably recycled, resulting in great waste. Both high temperature oxidation method and salt washing method require a complex series of equipment for pollution-free treatment, which is more expensive.

[0004] In the existing technical solutions, such as the application announcement number CN 117326572 A solid hazardous waste salt regeneration device and method, including a solid hazardous waste salt refining system, a baking soda reaction system, a product refining system and an ammonium chloride system. The solid hazardous waste salt is subjected to high-temperature cracking, dissolution, refining, evaporation and centrifugation to obtain refined salt, which is respectively sent to the baking soda reaction system and the ammonium chloride system. The baking soda reaction system uses the ammonium chloride system to salt out the mother liquor and the refined salt for reaction, adjusts the particle size, and obtains baking soda through centrifugation. The ammonium chloride system uses the remaining mother liquor of the baking soda reaction system, adds the refined salt to precipitate ammonium chloride, and performs subsequent operations to finally obtain the by-product ammonium chloride; the product refining system uses the baking soda produced by the baking soda reaction system to decompose under heat to obtain soda ash, but the baking soda reaction system uses the ammonium chloride system to salt out the mother liquor and the refined salt for reaction, and reacts in a normal pressure reactor to produce baking soda. The reaction conversion rate is low, as low as about 70%, and the generated baking soda contains part of sodium carbonate, which affects the quality of the baking soda. In addition, multiple agitators and transfer pumps are added to the reactor, and the particle size of the baking soda is reduced under mechanical shear force. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide an airflow oscillation regeneration device and method for treating solid and hazardous waste salt, which can improve the reaction conversion rate of solid and hazardous waste salt and improve the quality of baking soda.

[0006] To achieve the above objectives, the present invention proposes the following technical solutions: An air flow oscillation regeneration device for treating solid hazardous waste salt comprises a sodium precipitation system, an ammonium chloride precipitation system, a baking soda crude system, a deammoniation system and a baking soda refining system.

[0007] The sodium precipitation system includes a sodium chloride pulping tank, a first sodium precipitation tower, a second sodium precipitation tower, a sodium precipitation belt filter and a first refined mother tank which are connected in sequence through pipelines, wherein the first refined mother tank is connected to the sodium precipitation belt filter through a pipeline; a first tail gas output pipe is provided on the top of the second sodium precipitation tower and is connected to the first sodium precipitation tower; the ammonium chloride precipitation system includes a cold precipitation tower, a salting-out tower, an ammonium chloride belt filter, an ammonium chloride centrifuge and an ammonium chloride packing machine and a second refined mother tank which are connected in sequence through pipelines, wherein the second refined mother tank is connected to the ammonium chloride belt filter through a pipeline, the cold precipitation tower is connected to the first refined mother tank through a pipeline, and a second tail gas output pipe is provided on the top of the salting-out tower and is connected to the cold precipitation tower.

[0008] The baking soda crude system comprises an air flow oscillation reaction tower, a pre-reaction tower, a carbon ammonium slurry tank, a crude baking soda belt filter, a crude mother storage tank connected to the crude baking soda belt filter through a pipeline, a water washing tower, a separator and a CO 2 The airflow oscillation reaction tower is connected to the pre-reaction tower, the carbon ammonium slurry tank, the crude baking soda filter and the CO through pipelines. 2 The airflow oscillation reaction tower is connected to the pre-reaction tower through a pipeline. The water washing tower, separator, CO 2 The compressors are connected in sequence through pipelines; the CO 2 The compressor is connected to the second sodium precipitation tower and the salting-out tower through pipelines, and the crude mother storage tank is connected to the first sodium precipitation tower through pipelines.

[0009] The deamination system comprises a first deamination kettle and a second deamination kettle connected by pipelines, wherein the first deamination kettle is respectively connected to a crude baking soda belt filter, a sodium precipitation belt filter, and a second refined mother tank through pipelines; the baking soda refining system comprises a baking soda belt filter, a baking soda centrifuge, a baking soda dryer, and a semi-brine storage tank connected to the baking soda belt filter in sequence through pipelines, wherein the baking soda belt filter is connected to the second deamination kettle through a pipeline, and the semi-brine storage tank is connected to a sodium chloride pulping tank through a pipeline.

[0010] Preferably, the first sodium precipitation tower and the second sodium precipitation tower are used in series to perform secondary sodium precipitation to ensure the conversion rate of the sodium precipitation system.

[0011] Preferably, the sodium chloride pulping tank is connected to the first sodium precipitation tower through a pipeline provided with a sodium chloride slurry transfer pump; the first sodium precipitation tower is connected to the second sodium precipitation tower through a pipeline provided with a sodium precipitation transfer pump; the first fine mother storage tank is connected to the cold precipitation tower through a pipeline provided with a first fine mother transfer pump; the first deamination kettle is connected to the second deamination kettle through a pipeline provided with a first deamination transfer pump, and the second deamination kettle is connected to the baking soda belt filter through a pipeline provided with a second deamination transfer pump; the salting-out tower is connected to the cold precipitation tower through a pipeline provided with a salting-out transfer pump, and is connected to the ammonium chloride belt filter through a pipeline provided with an ammonium chloride transfer pump; the second fine mother storage tank is connected to the pre-reaction tower through a pipeline provided with a second fine mother transfer pump; the pre-reaction tower is connected to the airflow oscillation reaction tower through a pipeline provided with a preparatory liquid transfer pump; the carbon ammonium phosphate pulping tank is connected to the airflow oscillation reaction tower through a pipeline provided with a carbon ammonium phosphate slurry transfer pump.

[0012] Preferably, an ultrasonic oscillator is provided in the airflow oscillation reaction tower, which can, on the one hand, evenly mix the materials in the tower, and on the other hand, prevent the baking soda produced by the reaction from clumping and adhering to the wall.

[0013] Preferably, a stirring device is provided at the top of the airflow oscillation reaction tower to mix the incoming ammonium carbonate slurry and the preparatory liquid evenly and allow them to react fully, thereby improving the conversion rate.

[0014] Preferably, the water scrubber is provided with a water scrubber circulating spray pump, the pre-reaction tower is provided with a fourth tail gas output pipe, the fourth tail gas output pipe is connected to the water scrubber, the water scrubber is provided with a gas output pipe connected to the separator, and the water scrubber sprays and absorbs ammonia in the tail gas output by the pre-reaction tower under the action of the water scrubber circulating spray pump, so that CO in the tail gas 2 transported to the separator.

[0015] Preferably, a cooling coil is provided in the cold precipitation tower, and the temperature in the tower is lowered by heat exchange of the refrigerant in the coil. An ultrasonic device is also provided to reduce crystallization of materials on the cooling coil.

[0016] Another object of the present invention is to provide a method for treating solid and hazardous waste salt with air flow oscillation regeneration, comprising: preparing sodium chloride slurry from industrial waste salt, and preparing ammonium chloride through sodium precipitation, dehydration, cold precipitation, salting out, dehydration, and centrifugal packaging; preparing the mother liquor from ammonium chloride in CO 2 The reaction absorption is carried out under the action of air flow vibration to produce a preparatory liquid; the preparatory liquid is stirred and mixed with the ammonium carbonate slurry, and the preparatory liquid is stirred and mixed with the ammonium carbonate slurry under the action of air flow vibration. 2 The mixture reacts under the action of air flow vibration to generate crude baking soda, which is mixed with the solid separated from sodium precipitation and the mother liquor obtained from ammonium chloride preparation to remove ammonia, and then refined baking soda is obtained through dehydration, centrifugation and drying.

[0017] The tail gas generated by cold analysis and pre-reaction is washed, separated and mixed with fresh CO2 After mixing, it is compressed and recycled to 0.1~0.2MPa to provide compressed CO for air flow oscillation reaction, sodium precipitation reaction and salting-out reaction. 2 The gas produces a oscillating mixing effect, optimizes the reaction effect, and at the same time converts all the small amount of carbonate ions present in the reaction into sodium bicarbonate, thereby increasing the reaction conversion rate of solid hazardous waste salt.

[0018] The sodium chloride slurry is subjected to two sodium precipitations and then cold precipitation, and the crude baking soda is dehydrated after two deammoniations, so as to further improve the reaction conversion rate of industrial waste salt.

[0019] Specifically, industrial waste salt generated by petrochemical, coal chemical, metallurgical and other industries is prepared into sodium chloride slurry in a sodium chloride slurry making tank, which is then pumped to the first sodium precipitation tower via an ammonium chloride slurry pump. The crude mother liquor in the crude mother liquor tank is sent to the first sodium precipitation tower. The tail gas at the top of the second sodium precipitation tower is sent to the first sodium precipitation tower. The first sodium precipitation tower is stirred and mixed under the action of the tail gas, and then the sodium precipitation material is pumped to the second sodium precipitation tower via a sodium precipitation transfer pump. CO is input into the second sodium precipitation tower. 2 Compressor output CO 2 Gas, in CO 2 Under the action of the gas, the solid and liquid in the second sodium precipitation tower vibrate and mix to react. The mixture in the second sodium precipitation tower is centrifuged by the sodium precipitation belt filter and the first refined mother liquor is sent to the first refined mother liquor tank for storage. The first refined mother liquor in the first refined mother liquor tank is sent to the cold precipitation tower by the first refined mother liquor transfer pump. The cold precipitation tower is cooled by the refrigerant to precipitate the ammonium chloride in the first refined mother liquor. The solid-liquid mixture overflows the salting-out tower. The ammonium chloride slurry in the ammonium chloride slurry tank is introduced into the salting-out tower according to a certain proportion. CO is introduced into the bottom of the salting-out tower. 2 Compressor output CO 2 Gas, in CO 2 Under the action of gas, the solid-liquid mixture in the salting-out tower is shaken, mixed and dissolved, and the tail gas at the top of the salting-out tower is discharged to the cooling tower for disturbance. The ammonium chloride slurry produced in the middle of the salting-out tower is pumped to the ammonium chloride belt filter for solid-liquid separation through the ammonium chloride transfer pump. The obtained solid ammonium chloride is further dehydrated by the ammonium chloride centrifuge, and then packaged by the ammonium chloride packaging machine to output the finished ammonium chloride product.

[0020] The second refined mother liquor obtained after solid-liquid separation in the ammonium chloride centrifuge is sent to the second refined mother liquor storage tank for storage, and then transported to the pre-reaction tower through the second refined mother liquor transfer pump. Under a certain reaction temperature and pressure, the tail gas at the top of the airflow oscillation reaction tower is sent to the pre-reaction tower. Under the action of the airflow oscillation of the tail gas, the reaction absorption is carried out in the pre-reaction tower to produce a preliminary liquid; the tail gas at the top of the pre-reaction tower is discharged to the water washing tower, and the ammonia in the tail gas of the pre-reaction tower is sprayed and absorbed by the water washing tower circulating spray pump, and the remaining CO 2 After the water is removed by the separator, it is mixed with fresh CO 2 Gas mixture enters CO2 The compressor compresses and then recycles it.

[0021] The preparatory liquid is pumped to the air flow oscillation reaction tower through the preparatory liquid transfer pump, and the ammonium carbonate slurry tank is pumped to the air flow oscillation reaction tower through the ammonium carbonate slurry transfer pump. The preparatory liquid and ammonium carbonate slurry are stirred and mixed in a certain proportion. 2 The compressor delivers CO to the air flow oscillation reaction tower 2 The gas reacts under the action of air flow vibration to generate crude baking soda, which is centrifuged through a crude baking soda belt filter. The crude baking soda solid after centrifugal separation and the solid after centrifugal separation by the sodium precipitation belt filter are sequentially sent to the first deamination kettle, and the second refined mother liquor in the second refined mother liquor tank is sent to the first deamination kettle through the second refined mother liquor transfer pump. The first deamination kettle is subjected to a primary deamination, and the mixture is then sent to the second deamination kettle through the first deamination transfer pump for a secondary deamination, and then sent to the baking soda belt filter through the second deamination transfer pump. After centrifugation through the baking soda belt filter, the obtained baking soda solid is further centrifuged and dehydrated through a baking soda centrifuge, and further dried through a baking soda desiccant to finally obtain refined baking soda. The crude mother liquor after centrifugal separation by the crude baking soda belt filter is sent to the crude mother liquor tank for storage for standby use.

[0022] The beneficial effects of the present invention are: The present invention forms a complete set of airflow oscillation regeneration device and method for treating solid and hazardous waste salt by arranging a sodium precipitation system, an ammonium chloride precipitation system, a baking soda roughing system, a deammoniation system and a baking soda refining system, which are used in coordination with each other and closely linked, and are suitable for large-scale production of annual waste salt treatment of less than 100,000 tons.

[0023] The present invention utilizes airflow oscillation reaction, and through airflow disturbance, the reaction materials are fully mixed and reacted in the reaction tower, thereby improving the reaction efficiency of sodium precipitation reaction, precipitation of ammonium chloride, and crude baking soda, thereby improving the reaction conversion rate of solid hazardous waste salt, and at the same time improving the production quality of baking soda and ammonium chloride.

[0024] The present invention utilizes air flow oscillation in an air flow oscillation reaction tower to fully mix and react reaction materials in the reaction tower, thereby reducing the use of agitators and reducing the use of transfer pumps in a baking soda crude system and a baking soda refining system, thereby ensuring the particle size requirements of the baking soda.

[0025] By adopting the above scheme, the present invention can improve the reaction conversion rate of solid hazardous waste salt and improve the production quality of baking soda and ammonium chloride. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is the overall process flow diagram of the present invention.

[0028] In the figure, 1-separator; 2-water washing tower; 3-pre-reaction tower; 4-air flow oscillation reaction tower; 5-carbon ammonium slurry tank; 6-coarse baking soda belt filter; 7-coarse mother storage tank; 8-water washing tower circulation spray pump; 9-preparatory liquid transfer pump; 10-CO 2 Compressor; 11-carbon ammonium slurry transfer pump; 12-baking soda centrifuge; 13-baking soda dryer; 14-baking soda belt filter; 15-semi-brine storage tank; 16-second deamination kettle; 17-first deamination kettle; 18-first deamination transfer pump; 19-second deamination transfer pump; 20-sodium chloride pulping tank; 21-sodium chloride slurry transfer pump; 22-first sodium precipitation tower; 23-sodium precipitation transfer pump; 24-second sodium precipitation tower; 25-sodium precipitation belt filter; 26-first refined mother storage tank; 27-first refined mother transfer pump; 28-salting out tower; 29-salting out transfer pump; 30-cold precipitation tower; 31-ammonium chloride transfer pump; 32-second refined mother transfer pump; 33-second refined mother storage tank; 34-ammonium chloride belt filter; 35-ammonium chloride centrifuge; 36-ammonium chloride packing machine. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] First embodiment: like Figure 1 As shown, an air flow oscillation regeneration device for treating solid hazardous waste salt includes a sodium precipitation system, an ammonium chloride precipitation system, a baking soda crude system, a deammoniation system, and a baking soda refining system.

[0034] The sodium precipitation system includes a sodium chloride pulping tank 20, a first sodium precipitation tower 22, a second sodium precipitation tower 24, a sodium precipitation belt filter 25 and a first refined mother tank 26 which are connected in sequence through pipelines, and the first refined mother tank 26 is connected to the sodium precipitation belt filter 25 through a pipeline; a first tail gas output pipe is provided on the top of the second sodium precipitation tower 24 and is connected to the first sodium precipitation tower 22; the ammonium chloride precipitation system includes a cold precipitation tower 30, a salting out tower 28, an ammonium chloride belt filter 34, an ammonium chloride centrifuge 35 and an ammonium chloride packing machine 36 and a second refined mother tank 33 which are connected in sequence through pipelines, the second refined mother tank 33 is connected to the ammonium chloride belt filter 36 through a pipeline, the cold precipitation tower 30 is connected to the first refined mother tank 26 through a pipeline, and a second tail gas output pipe is provided on the top of the salting out tower 28 and is connected to the cold precipitation tower 30.

[0035] The baking soda crude system comprises an air flow oscillation reaction tower 4, a pre-reaction tower 3, a carbon ammonium slurry tank 5, a crude baking soda belt filter 6, a crude mother storage tank 7 connected to the crude baking soda belt filter 6 through a pipeline, a water washing tower 2, a separator 1 and a CO 2 The airflow oscillation reaction tower 4 is connected to the pre-reaction tower 3, the carbon ammonium slurry tank 5, the crude baking soda belt filter 6 and the CO 2 The airflow oscillation reaction tower 4 is connected to the pre-reaction tower 3 by a third tail gas output pipe, and the water washing tower 2 is connected to the pre-reaction tower 3 by a pipeline. The water washing tower 2, the separator 1, and the CO 2 The compressors 10 are connected in sequence through pipelines; the CO2 The compressor 10 is connected to the second sodium precipitation tower 24 and the salting-out tower 28 through pipelines, and the crude mother storage tank 7 is connected to the first sodium precipitation tower 22 through pipelines.

[0036] The deamination system includes a first deamination kettle 17 and a second deamination kettle 16 connected by pipelines, and the first deamination kettle 17 is respectively connected to the crude baking soda belt filter 6, the sodium precipitation belt filter 25, and the second refined mother tank 33 through pipelines; the baking soda refining system includes a baking soda belt filter 14, a baking soda centrifuge 12, a baking soda dryer 13 and a semi-brine storage tank 15 connected to the baking soda belt filter 14 in sequence through pipelines, the baking soda belt filter 14 is connected to the second deamination kettle 16 through a pipeline, and the semi-brine storage tank 15 is connected to the sodium chloride pulping tank 20 through a pipeline.

[0037] The first sodium precipitation tower 22 and the second sodium precipitation tower 24 are used in series to perform secondary sodium precipitation to ensure the conversion rate of the sodium precipitation system.

[0038] The sodium chloride pulping tank 20 is connected to the first sodium precipitation tower 22 through a pipeline provided with a sodium chloride slurry transfer pump 21; the first sodium precipitation tower 22 is connected to the second sodium precipitation tower 24 through a pipeline provided with a sodium precipitation transfer pump 23; the first refined mother storage tank 26 is connected to the cold precipitation tower 30 through a pipeline provided with a first refined mother transfer pump 27; the first deamination kettle 17 is connected to the second deamination kettle 16 through a pipeline provided with a first deamination transfer pump 18, and the second deamination kettle 16 is connected to the sodium chloride slurry transfer pump 19 through a pipeline provided with a second deamination transfer pump 19. The belt filter 14 is connected; the salting-out tower 28 is connected to the cooling tower 30 through a pipeline provided with a salting-out transfer pump 29, and is connected to the ammonium chloride belt filter 34 through a pipeline provided with an ammonium chloride transfer pump 31; the second refined mother storage tank 33 is connected to the pre-reaction tower 3 through a pipeline provided with a second refined mother transfer pump 32; the pre-reaction tower 3 is connected to the airflow shock reaction tower 4 through a pipeline provided with a pre-liquid transfer pump 9; the carbon ammonium slurry tank 5 is connected to the airflow shock reaction tower 4 through a pipeline provided with a carbon ammonium slurry transfer pump 11.

[0039] The airflow oscillation reaction tower 4 is provided with an ultrasonic oscillator, which can, on the one hand, make the materials in the tower evenly mixed, and on the other hand, prevent the baking soda produced by the reaction from clumping and hanging on the wall.

[0040] A stirring device is provided at the top of the airflow oscillation reaction tower 4 for mixing the incoming ammonium carbonate slurry and the preparatory liquid evenly and allowing them to react fully, thereby improving the conversion rate.

[0041] The water scrubber 3 is provided with a water scrubber circulating spray pump 8, the pre-reaction tower 3 is provided with a fourth tail gas output pipe, the fourth tail gas output pipe is connected to the water scrubber 2, the water scrubber 2 is provided with a gas output pipe connected to the separator 1, and the water scrubber 2 sprays and absorbs ammonia in the tail gas outputted from the pre-reaction tower 3 under the action of the water scrubber circulating spray pump, so that CO in the tail gas is 2 Transported to separator 1.

[0042] The cold precipitation tower 30 is provided with a cooling coil to reduce the temperature in the tower through heat exchange with the refrigerant in the coil, and an ultrasonic device is also provided to reduce crystallization of materials on the cooling coil.

[0043] Second embodiment: A method for treating solid and hazardous waste salt by air flow oscillation regeneration, comprising: preparing sodium chloride slurry from industrial waste salt, and preparing ammonium chloride by sodium precipitation, dehydration, cold precipitation, salting out, dehydration, and centrifugal packaging; preparing the mother liquor obtained by preparing ammonium chloride in CO 2 The reaction absorption is carried out under the action of air flow vibration to produce a preparatory liquid; the preparatory liquid is stirred and mixed with the ammonium carbonate slurry, and the preparatory liquid is stirred and mixed with the ammonium carbonate slurry under the action of air flow vibration. 2 The mixture reacts under the action of air flow vibration to generate crude baking soda, which is mixed with the solid separated from sodium precipitation and the mother liquor obtained from ammonium chloride preparation to remove ammonia, and then refined baking soda is obtained through dehydration, centrifugation and drying.

[0044] The tail gas generated by cold analysis and pre-reaction is washed, separated and mixed with fresh CO 2 After mixing, it is compressed and recycled to 0.1~0.2MPa to provide compressed CO for air flow oscillation reaction, sodium precipitation reaction and salting-out reaction. 2 The gas produces a oscillating mixing effect, optimizes the reaction effect, and at the same time converts all the small amount of carbonate ions present in the reaction into sodium bicarbonate, thereby increasing the reaction conversion rate of solid hazardous waste salt.

[0045] The sodium chloride slurry is subjected to two sodium precipitations and then cold precipitation, and the crude baking soda is subjected to two deammoniations and then dehydrated, thereby further improving the reaction conversion rate of industrial waste salt.

[0046] By using the device provided in the first embodiment and the method provided in the second embodiment, the reaction conversion rate of industrial waste salt is finally increased to 80%, the purity of baking soda is increased by 20%, and the purity of ammonium chloride is also increased by 10%.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An airflow oscillation regeneration device for treating solid hazardous waste salt, characterized in that: It includes a sodium precipitation system, an ammonium chloride precipitation system, a baking soda roughing system, a deammoniation system, and a baking soda refining system; the sodium precipitation system includes a sodium chloride pulping tank, a first sodium precipitation tower, a second sodium precipitation tower, a sodium precipitation belt filter, and a first refined mother tank, which are sequentially connected through pipelines, and the second sodium precipitation tower is provided with a first tail gas output pipe connected to the first sodium precipitation tower; the ammonium chloride precipitation system includes a cold precipitation tower, a salting-out tower, an ammonium chloride belt filter, an ammonium chloride centrifuge, and an ammonium chloride packing machine, and a second refined mother tank connected to the ammonium chloride belt filter through a pipeline, the cold precipitation tower is connected to the first refined mother tank through a pipeline, and the salting-out tower is provided with a second tail gas output pipe connected to the cold precipitation tower; the baking soda roughing system includes an airflow oscillation reaction tower, a pre-reaction tower, an ammonium carbonate pulping tank, a crude baking soda belt filter, a crude mother tank connected to the crude baking soda belt filter, a water washing tower, a separator, and a CO2 compressor, and the airflow oscillation reaction tower is connected through a pipeline They are respectively connected to the pre-reaction tower, the ammonium carbonate pulping tank, the crude baking soda belt filter and the CO2 compressor. The airflow oscillation reaction tower is provided with a third tail gas output pipe connected to the pre-reaction tower. The water washing tower is connected to the pre-reaction tower through a pipeline, and the water washing tower, the separator and the CO2 compressor are connected in sequence through pipelines; the CO2 compressor is connected to the second sodium precipitation tower and the salting-out tower through a pipeline, and the crude mother storage tank is connected to the first sodium precipitation tower through a pipeline; the deamination system comprises a first deamination kettle and a second deamination kettle connected through pipelines, and the first deamination kettle is respectively connected to the crude baking soda belt filter, the sodium precipitation belt filter and the second refined mother storage tank through pipelines; the baking soda refining system comprises a baking soda belt filter, a baking soda centrifuge, a baking soda dryer and a semi-brine storage tank connected to the baking soda belt filter, which are connected in sequence through pipelines, the baking soda belt filter is connected to the second deamination kettle through a pipeline, and the semi-brine storage tank is connected to the sodium chloride pulping tank through a pipeline.

2. The airflow oscillation regeneration device for treating solid and hazardous waste salt according to claim 1 is characterized by: The sodium chloride pulping tank is connected to the first sodium precipitation tower through a pipeline provided with a sodium chloride slurry transfer pump; the first sodium precipitation tower is connected to the second sodium precipitation tower through a pipeline provided with a sodium precipitation transfer pump; the first refined mother storage tank is connected to the cold precipitation tower through a pipeline provided with a first refined mother transfer pump; the first deamination kettle is connected to the second deamination kettle through a pipeline provided with a first deamination transfer pump, and the second deamination kettle is connected to the baking soda belt filter through a pipeline provided with a second deamination transfer pump; the salting-out tower is connected to the cold precipitation tower through a pipeline provided with a salting-out transfer pump, and is connected to the ammonium chloride belt filter through a pipeline provided with an ammonium chloride transfer pump; the second refined mother storage tank is connected to the pre-reaction tower through a pipeline provided with a second refined mother transfer pump; the pre-reaction tower is connected to the airflow oscillation reaction tower through a pipeline provided with a preparatory liquid transfer pump; the carbon ammonium phosphate pulping tank is connected to the airflow oscillation reaction tower through a pipeline provided with a carbon ammonium phosphate slurry transfer pump.

3. The airflow oscillation regeneration device for treating solid and hazardous waste salt according to claim 1 is characterized by: An ultrasonic oscillator is arranged in the airflow oscillation reaction tower, and a stirring device is arranged on the top of the airflow oscillation reaction tower.

4. The airflow oscillation regeneration device for treating solid and hazardous waste salt according to claim 1 is characterized by: The water scrubber is provided with a water scrubber circulating spray pump, the pre-reaction tower is provided with a fourth tail gas output pipe, the fourth tail gas output pipe is connected to the water scrubber, and the water scrubber is provided with a gas output pipe connected to the separator.

5. The airflow oscillation regeneration device for treating solid and hazardous waste salt according to claim 1 is characterized by: The cooling tower is provided with a cooling coil and an ultrasonic device.

6. An airflow oscillation regeneration method for treating solid and hazardous waste salts suitable for the device described in claims 1 to 5, characterized in that: Industrial waste salt is made into sodium chloride slurry, and ammonium chloride is obtained through sodium precipitation, dehydration, cold precipitation, salting out, dehydration, centrifugal packaging; the mother liquor obtained from ammonium chloride is reacted and absorbed under the action of CO2 air flow vibration to produce a preparatory liquid; The preparatory liquid is stirred and mixed with the ammonium carbonate slurry, and reacted under the oscillation of CO2 gas flow to generate crude baking soda, which is mixed with the solid separated from the sodium precipitation and the mother liquor obtained from the preparation of ammonium chloride to remove ammonia, and refined baking soda is obtained through dehydration, centrifugation and drying.

7. The airflow oscillation regeneration method for treating solid hazardous waste salt according to claim 6 is characterized in that: The tail gas generated by cold analysis and pre-reaction is washed with water, separated and mixed with fresh CO2, and then compressed and recycled. It is compressed to 0.1~0.2MPa to provide compressed CO2 gas for air flow shock reaction, sodium precipitation reaction and salting-out reaction.

8. The airflow oscillation regeneration method for treating solid hazardous waste salt according to claim 6, characterized in that: The sodium chloride slurry is subjected to two sodium precipitations and then cold precipitation, and the crude baking soda is subjected to two deammoniations and then dehydrated.

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