An apparatus and method for treating industrial mixed salt

Abstract

The application relates to the technical field of industrial miscellaneous salt treatment, in particular to a device and method for treating industrial miscellaneous salt. In order to solve the problem that the existing industrial miscellaneous salt treatment method is not environmentally friendly, a new device and method for treating industrial miscellaneous salt are provided, which comprise a medium-frequency furnace, the top of the medium-frequency furnace is provided with a flue gas outlet, the top end of the medium-frequency furnace is provided with a feeding opening, the feeding opening is sealingly provided with a feeding machine, the bottom end of the medium-frequency furnace is provided with a discharging opening, and the flue gas outlet of the medium-frequency furnace is connected with a tail gas treatment system. The device and method are a brand-new device and method for treating industrial miscellaneous salt, that is, the industrial miscellaneous salt is mixed with auxiliary materials and is melted into a glass phase melt, which is used as a raw material in the glass industry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial mixed salt treatment, in particular to a device and method for treating industrial mixed salt. BACKGROUND

[0002] Industrial mixed salt is a solid hazardous waste containing one or more inorganic salts such as sodium chloride, sodium nitrate, calcium chloride, magnesium chloride, and sodium sulfide. Industrial mixed salt has a strong irritating odor, is highly toxic, has complex components, and is difficult to dispose. Traditional industrial mixed salt treatment mostly uses landfill disposal, which can cause great hidden dangers to local environmental protection and safety. SUMMARY

[0003] The present application provides a new device and method for treating industrial mixed salt to solve the problem of environmental pollution in the existing industrial mixed salt treatment method.

[0004] The present application is implemented by using the following technical solutions:

[0005] A device for treating industrial mixed salt includes a medium frequency furnace, a smoke outlet is arranged at the top of the medium frequency furnace, a feeding port is arranged at the top end of the medium frequency furnace, a screw feeder is arranged at the feeding port, a discharge port is arranged at the bottom end of the medium frequency furnace, and the smoke outlet of the medium frequency furnace is connected with a tail gas treatment system.

[0006] Further, the tail gas treatment system includes a bag-type dust collector, a purification tower, a water removal device, a liquefaction device, and a CO2 purification device. The smoke outlet of the medium frequency furnace is in communication with the smoke inlet of the bag-type dust collector. The smoke outlet of the bag-type dust collector is in communication with the smoke inlet of the purification tower. The smoke outlet of the purification tower is in communication with the gas inlet of the water removal device. The gas outlet of the water removal device is in communication with the gas inlet of the liquefaction device. The purification outlet of the liquefaction device is used for extracting SO2. The gas outlet of the liquefaction device is in communication with the gas inlet of the CO2 purification device. The CO2 purification device adsorbs the remaining SO2. The gas outlet of the CO2 purification device is used for extracting CO2.

[0007] Further, the feeding port of the medium frequency furnace is two and symmetrically arranged at the top end of the medium frequency furnace. Screw feeders are arranged at the two feeding ports to facilitate uniform feeding and further improve the treatment effect of industrial mixed salt.

[0008] Further, the discharge port of the intermediate frequency furnace is fixed with an L-shaped melt buffer cavity, one end of the cavity of the L-shaped melt buffer cavity is in sealed communication with the discharge port of the intermediate frequency furnace, and the other end of the cavity of the L-shaped melt buffer cavity is arranged higher than the discharge port of the intermediate frequency furnace, so that the glass phase melt can be temporarily buffered in the L-shaped melt buffer cavity after being discharged from the discharge port of the intermediate frequency furnace, the lower part of the heat source is closed, the heat loss is reduced, and the glass phase melt temporarily buffered in the L-shaped melt buffer cavity is discharged from the other end of the cavity of the L-shaped melt buffer cavity after the subsequent industrial miscellaneous salt mixture is dissolved in the intermediate frequency furnace to form the glass phase melt.

[0009] The method for processing industrial miscellaneous salt by the above device comprises the following steps in sequence: 1) batching: the industrial miscellaneous salt is mixed with silica sand and coal powder to form an industrial miscellaneous salt mixture (the proportions of the industrial miscellaneous salt, the silica sand and the coal powder are different according to the different components of the industrial miscellaneous salt, and the specific proportions can be obtained by routine experiments by those skilled in the art, for example, when the components of the industrial miscellaneous salt are Na2SO4 and a small amount of Na2CO3, the mass ratio of the industrial miscellaneous salt, the silica sand and the coal powder is (4-5):(6-5.4):(0.1-0.4)); 2) starting the furnace: the industrial miscellaneous salt mixture is first added into the intermediate frequency furnace through the charging port at the top end of the intermediate frequency furnace, and fuel is added at the flue gas outlet of the intermediate frequency furnace, so that the industrial miscellaneous salt mixture is burned and melted into a glass phase; 3) starting the furnace: the intermediate frequency furnace is started, and the flue gas outlet is connected with the tail gas treatment system, and the addition of the industrial miscellaneous salt mixture to the charging port at the top end of the intermediate frequency furnace is started, the intermediate frequency furnace uses the principle of intermediate frequency electromagnetic induction to melt and dissolve the industrial miscellaneous salt mixture, the glass phase melt formed by the melting and dissolving is discharged from the discharge port at the bottom end of the intermediate frequency furnace and is recycled as raw material for producing glass, and the tail gas generated in the melting and dissolving process is discharged from the flue gas outlet of the intermediate frequency furnace and enters the tail gas treatment system, and the tail gas is treated and discharged.

[0010] Further, the tail gas treatment system comprises a bag-type dust collector, a purification tower, a water removal device, a liquefaction device and a CO2 purification device, the tail gas discharged from the flue gas outlet of the intermediate frequency furnace is sequentially subjected to dust removal, purification and water removal by the bag-type dust collector, the purification tower and the water removal device, and then is cooled by the liquefaction device and SO2 is extracted by using the different liquefaction temperatures of SO2 and CO2, and the remaining flue gas enters the CO2 purification device to extract CO2.

[0011] Principle: industrial miscellaneous salt is added to silica sand and carbon powder to form an industrial miscellaneous salt mixture, which is melted by fuel combustion to form a glass phase melt, and then the glass phase melt is used to start the medium frequency furnace to melt the industrial miscellaneous salt mixture added into the medium frequency furnace subsequently by using the medium frequency induction principle, the melted glass phase melt is discharged from the discharge port of the medium frequency furnace, during which, the industrial miscellaneous salt mixture is continuously added, the glass phase melt is continuously generated, and the medium frequency furnace is continuously operated to continuously dissolve the subsequently added industrial miscellaneous salt mixture, so that continuous operation is realized, and the generated glass phase melt is used as raw material for various glass production; at the same time, the tail gas generated by heating the industrial miscellaneous salt mixture by the medium frequency induction principle mainly contains SO2, CO2 and H2O, and the dust content is low, so the tail gas discharged from the flue gas outlet of the medium frequency furnace is sequentially subjected to dust removal, purification and water removal through a bag type dust collector, a purification tower and a water removal device, and then the tail gas is cooled through a liquefaction device, and SO2 is extracted by using the different liquefaction temperatures of SO2 and CO2, and the remaining flue gas enters a CO2 purification device to extract CO2 after the CO2 purification device adsorbs the remaining SO2.

[0012] The beneficial effects of the present application are as follows: the device and method of the present application are a new device and method for processing industrial miscellaneous salt, which comprehensively utilizes industrial miscellaneous salt resources, turns waste into treasure, and makes the industrial miscellaneous salt mixed with auxiliary materials and melted into a glass phase melt, which is used as raw material for the glass industry, at the same time, the medium frequency furnace itself is used to heat metal materials, and the present application forms a conductive glass phase by starting the furnace, and then uses the glass phase to melt the subsequently added industrial miscellaneous salt mixture by using the medium frequency induction principle, in addition, the dust content of the tail gas generated by the medium frequency furnace is low, and the tail gas is treated and collected into SO2 and CO2 products, which benefits the country and the people, and improves the existing disposal method of industrial miscellaneous salt in terms of environmental protection and safety, and plays a great role in energy saving and carbon reduction. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without any creative labor.

[0015] Figure 1 It is the overall structure schematic diagram of the device of the present application.

[0016] In the diagram: 1-Induction furnace, 2-Flue gas outlet, 3-Screw feeder, 4-Discharge port, 5-Bag dust collector, 6-Purification tower, 7-Water separator, 8-Liquefaction device, 9-CO2 purification device, 10-L-type melt buffer chamber. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0018] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0020] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0021] like Figure 1 As shown, an apparatus for processing industrial miscellaneous salts includes a medium-frequency furnace 1, a flue gas outlet 2 at the top of the furnace 1, a feeding port at the top of the furnace 1, a screw feeder 3 sealed at the feeding port, a discharge port 4 at the bottom of the furnace 1, and the flue gas outlet 2 of the furnace 1 is connected to a tail gas treatment system.

[0022] In specific implementation, the exhaust gas treatment system includes a bag filter 5, a purification tower 6, a water separator 7, a liquefaction device 8, and a CO2 purification device 9. The flue gas outlet 2 of the medium-frequency furnace 1 is connected to the flue gas inlet of the bag filter 5. The flue gas outlet 2 of the bag filter 5 is connected to the flue gas inlet of the purification tower 6. The flue gas outlet 2 of the purification tower 6 is connected to the gas inlet of the water separator. The gas outlet of the water separator is connected to the gas inlet of the liquefaction device 8. The purification outlet of the liquefaction device 8 is used to extract SO2. The gas outlet of the liquefaction device 8 is connected to the gas inlet of the CO2 purification device 9. The gas outlet of the CO2 purification device 9 is used to extract CO2.

[0023] In specific implementation, the intermediate frequency furnace 1 has two feeding openings which are symmetrically arranged at the top end of the intermediate frequency furnace 1, and each feeding opening is provided with a screw feeder 3, so that the feeding is uniform, and the treatment effect of the industrial miscellaneous salt is further improved.

[0024] In specific implementation, the discharge opening 4 of the intermediate frequency furnace 1 is fixed with an L-shaped melt buffer cavity 10, one end of the L-shaped melt buffer cavity 10 is in sealed communication with the discharge opening 4 of the intermediate frequency furnace 1, and the other end of the L-shaped melt buffer cavity 10 is arranged higher than the discharge opening 4 of the intermediate frequency furnace 1, so that the glass phase melt discharged from the discharge opening 4 of the intermediate frequency furnace 1 can be temporarily buffered in the L-shaped melt buffer cavity 10, the lower part of the heat source is closed, the heat loss is reduced, and the glass phase melt formed after the subsequent industrial miscellaneous salt mixture is dissolved in the intermediate frequency furnace 1 is discharged from the other end of the L-shaped melt buffer cavity 10.

[0025] The method for treating industrial miscellaneous salt by the above device comprises the following steps in sequence: 1) batching: the industrial miscellaneous salt is mixed with silica sand and coal powder to form an industrial miscellaneous salt mixture (the proportions of the industrial miscellaneous salt, the silica sand and the coal powder are different according to the components of the industrial miscellaneous salt, and the specific proportions can be obtained by routine experiments by those skilled in the art, for example, when the components of the industrial miscellaneous salt are Na2SO4 and a small amount of Na2CO3, the mass ratio of the industrial miscellaneous salt, the silica sand and the coal powder is (4-5):(6-5.4):(0.1-0.4); 2) starting the furnace: the industrial miscellaneous salt mixture is first added into the intermediate frequency furnace 1 through the feeding opening at the top end of the intermediate frequency furnace 1, and fuel is added at the flue gas outlet 2 of the intermediate frequency furnace 1, so that the industrial miscellaneous salt mixture is burned and heated to be melted into a glass phase; 3) starting the furnace: the intermediate frequency furnace 1 is started, and the flue gas outlet 2 is connected to the tail gas treatment system, and the addition of the industrial miscellaneous salt mixture to the feeding opening at the top end of the intermediate frequency furnace 1 is started, the intermediate frequency furnace 1 melts the industrial miscellaneous salt mixture by the principle of intermediate frequency electromagnetic induction, the glass phase melt formed by the melting is discharged from the discharge opening 4 at the bottom end of the intermediate frequency furnace 1 and is recycled as raw material for producing glass, and the tail gas generated in the melting process is discharged from the flue gas outlet 2 of the intermediate frequency furnace 1 and enters the tail gas treatment system, and the tail gas is treated and then discharged.

[0026] In specific implementation, the tail gas treatment system comprises a bag-type dust collector 5, a purification tower 6, a water removal device 7, a liquefaction device 8 and a CO2 purification device 9, the tail gas discharged from the flue gas outlet 2 of the intermediate frequency furnace 1 passes through the bag-type dust collector 5, the purification tower 6 and the water removal device in sequence, is dusted, purified and dehydrated, is then cooled by the liquefaction device 8, and SO2 is extracted by taking advantage of the different liquefaction temperatures of SO2 and CO2, the remaining flue gas enters the CO2 purification device 9, and CO2 is extracted after the CO2 purification device 9 adsorbs the remaining SO2.

[0027] Principle: industrial miscellaneous salt is added to silica sand and carbon powder to form an industrial miscellaneous salt mixture, which is melted by fuel combustion to form a glass phase melt. Then, the glass phase melt is used to start the medium frequency furnace 1 to melt the industrial miscellaneous salt mixture added into the medium frequency furnace 1 by using the medium frequency induction principle. The melted glass phase melt is discharged from the discharge port 4 of the medium frequency furnace 1. During this period, the industrial miscellaneous salt mixture is continuously added, the glass phase melt is continuously generated, and the medium frequency furnace 1 is continuously operated. The continuously added industrial miscellaneous salt mixture is continuously dissolved to form a continuous operation. The generated glass phase melt is then used as raw material for various glass production. At the same time, the tail gas generated by melting the industrial miscellaneous salt mixture by the medium frequency induction principle mainly contains SO2, CO2, and H2O, and has low dust content. Therefore, the tail gas discharged from the flue gas outlet 2 of the medium frequency furnace 1 is sequentially subjected to dust removal, purification, and water removal by the bag-type dust collector 5, the purification tower 6, and the water removal device 7. Then, the tail gas is cooled by the liquefaction device 8, SO2 is extracted by using the different liquefaction temperatures of SO2 and CO2, the remaining flue gas enters the CO2 purification device 9, and CO2 is extracted after the CO2 purification device adsorbs the remaining SO2.

[0028] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Although the foregoing embodiments are described in detail, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should be covered in the protection scope of the claims.

Claims

1. A method for treating industrial mixed salt, which is implemented by a device for treating industrial mixed salt, characterized by, The device comprises a medium frequency furnace (1), the top of the medium frequency furnace (1) is provided with a flue gas outlet (2), the top end of the medium frequency furnace (1) is provided with a feeding port, the feeding port is sealingly provided with a screw feeder (3), the bottom end of the medium frequency furnace (1) is provided with a discharge port (4), the flue gas outlet (2) of the medium frequency furnace (1) is connected with a tail gas treatment system, the discharge port (4) of the medium frequency furnace (1) is fixed with an L-shaped melt buffer cavity (10), one end of the L-shaped melt buffer cavity (10) is sealingly communicated with the discharge port (4) of the medium frequency furnace (1), and the other end of the L-shaped melt buffer cavity (10) is arranged higher than the discharge port (4) of the medium frequency furnace (1), the tail gas treatment system comprises a bag-type dust collector (5), a purification tower (6), a water trap (7), a liquefaction device (8) and a CO2 purification device (9), the flue gas outlet (2) of the medium frequency furnace (1) is communicated with a flue gas inlet of the bag-type dust collector (5), the flue gas outlet (2) of the bag-type dust collector (5) is communicated with a flue gas inlet of the purification tower (6), the flue gas outlet (2) of the purification tower (6) is communicated with a gas inlet of the water trap, the gas outlet of the water trap is communicated with a gas inlet of the liquefaction device (8), the purification outlet of the liquefaction device (8) is used for extracting SO2, the gas outlet of the liquefaction device (8) is communicated with a gas inlet of the CO2 purification device (9), the CO2 purification device (9) adsorbs the remaining SO2, and the gas outlet of the CO2 purification device (9) is used for extracting CO2. The method comprises the following steps in sequence: 1) batching: industrial miscellaneous salt is mixed with silica sand and carbon powder to form an industrial miscellaneous salt mixture; 2) starting the furnace: the industrial miscellaneous salt mixture is first added into the medium frequency furnace (1) through the feeding port at the top end of the medium frequency furnace (1), and fuel is added at the flue gas outlet (2) of the medium frequency furnace (1) to make the industrial miscellaneous salt mixture burn and melt into a glass phase; 3) starting the furnace: the medium frequency furnace (1) is started, and the flue gas outlet (2) is connected with a tail gas treatment system, and the industrial miscellaneous salt mixture is continuously added into the feeding port at the top end of the medium frequency furnace (1), the industrial miscellaneous salt mixture is melted by the medium frequency electromagnetic induction principle of the medium frequency furnace (1), the glass phase melt formed by melting is discharged from the discharge port (4) at the bottom end of the medium frequency furnace (1) and is recycled as a raw material for producing glass, and the tail gas generated in the melting process is discharged from the flue gas outlet (2) of the medium frequency furnace (1) and enters the tail gas treatment system, and the tail gas is treated and discharged.

2. A method for treating industrial mixed salt according to claim 1, characterized in that, The feeding port of the medium frequency furnace (1) is two and symmetrically distributed on the top end of the medium frequency furnace (1), and the screw feeders (3) are arranged at the two feeding ports.

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