Equipment for the oxygen-free pyrolysis treatment of industrial waste salt

Abstract

This utility model relates to equipment for the oxygen-free pyrolysis treatment of industrial waste salt, specifically to equipment for the oxygen-free pyrolysis treatment of industrial waste salt. The equipment includes an oxygen-free insulated box, the inner wall of which is lined with an insulation layer. The equipment is characterized by a waste salt pyrolysis furnace fixedly installed inside the oxygen-free insulated box, and a shield-shaped spiral feeder installed inside the furnace. One end of the spiral feeder is connected to a feed driver located outside the oxygen-free insulated box. A waste salt feed pipe extending upwards from one end of the furnace is provided, and a discharge device is provided at the lower part of the other end. This utility model places the waste salt pyrolysis furnace and secondary combustion chamber inside the oxygen-free insulated box, ensuring an oxygen-free state during the pyrolysis process, eliminating the need for inert gas protection, and guaranteeing the safe operation of the waste salt pyrolysis furnace and the requirement for complete carbonization of organic matter.

Description

Technical Field

[0001] This utility model relates to the field of industrial waste salt treatment technology, specifically to an equipment for the oxygen-free pyrolysis treatment of industrial waste salt. Background Technology

[0002] Currently, equipment for the pyrolysis treatment of industrial waste salt includes high-temperature melting equipment, rotary kiln equipment, and microwave pyrolysis equipment. High-temperature melting involves heating the industrial waste salt until it is completely melted into a liquid state. The temperature is usually determined based on the composition of the waste salt (typically not lower than 800℃). In this state, the organic matter in the waste salt is completely decomposed or oxidized. The molten salt is then cooled to below 95℃ by circulating water and sent to the downstream resource recovery process. Rotary kiln pyrolysis generally has two stages: the first stage removes moisture from the waste salt, and the second stage completely removes, decomposes, and oxidizes the organic matter in the waste salt in a relatively low and non-molten state, achieving the purpose of refining. Microwave pyrolysis technology utilizes the energy of the electric field lost by the waste salt itself to generate heat, and then uses the heat generated after the waste salt receives microwave radiation (temperature adjustable) to pyrolyze the organic matter.

[0003] The above-mentioned equipment can basically meet the function of TOC removal when the composition of waste salt is relatively stable. However, analysis of the source of industrial waste salt shows that fluctuations in waste salt are normal. Compared with pure salt, the difference in eutectic temperature of waste salt is greatly affected by changes in waste salt composition. Therefore, the above technologies usually face problems such as poor continuous stability (i.e., easy salt scale formation and low online rate of the device), high operating costs (incomplete impurity removal, requiring the setting of deep impurity removal units and concentration, which leads to high energy consumption and high cost), and insufficient by-product quality. Therefore, this utility model provides a continuous temperature, low carbon and high efficiency industrial waste salt pyrolysis treatment device. Utility Model Content

[0004] The purpose of this invention is to provide an industrial waste salt disposal device and its usage method that can operate continuously, stably, and efficiently from anaerobic pyrolysis waste salt, in order to solve the problems mentioned in the background art.

[0005] This utility model relates to equipment for the oxygen-free pyrolysis treatment of industrial waste salt, including an oxygen-free heat preservation box, the inner wall of which is covered with a heat insulation layer, a waste salt pyrolysis furnace is fixedly installed inside the oxygen-free heat preservation box, a shield-shaped spiral pusher is installed inside the waste salt pyrolysis furnace, and one end of the shield-shaped spiral pusher is connected to a pusher driver located outside the oxygen-free heat preservation box.

[0006] The waste salt pyrolysis furnace is equipped with a waste salt feed pipe extending upward into an oxygen-free and heat-insulating box at one end, and a discharge device is provided at the lower part of the other end of the waste salt pyrolysis furnace.

[0007] A secondary combustion chamber is also fixedly installed inside the oxygen-insulated box above the waste salt pyrolysis furnace. The secondary combustion chamber is connected to the waste salt pyrolysis furnace through a pyrolysis gas discharge pipe. An exhaust gas discharge pipe extending out of the oxygen-insulated box is also installed on the secondary combustion chamber. A pyrolysis flue gas treatment device is connected to the exhaust gas discharge pipe.

[0008] It also includes a secondary combustion chamber burner located outside the oxygen-insulated box, with one end of the secondary combustion chamber burner passing through the oxygen-insulated box and extending into the secondary combustion chamber.

[0009] Preferably, the waste salt pyrolysis furnace is a hollow column, and both ends of the waste salt pyrolysis furnace are welded to the inner walls of the corresponding sides of the oxygen-insulated box.

[0010] The waste salt pyrolysis furnace is surrounded by three cylindrical arc surfaces, two of which are arranged side by side and the third arc surface. The two side-by-side arc surfaces that are close to each other are connected, and the two arc surfaces that are far apart from each other are connected through the third arc surface.

[0011] The central axes of the three cylindrical arc surfaces are set parallel to each other;

[0012] Pyrolysis furnace discharge pipes are provided on both parallel arc surfaces, and the pyrolysis furnace discharge pipes are connected to the discharge device.

[0013] A shield-shaped spiral feeder is installed in each of the two parallel arc surfaces.

[0014] Preferably, two waste salt feed pipes are provided on the third arc surface, and the two waste salt feed pipes are respectively provided in the regions of the two parallel arc surfaces.

[0015] Preferably, the diameters of the circles containing the two parallel arc surfaces are equal.

[0016] Preferably, the shield-shaped spiral feeder is a shield-shaped spiral feeder whose size matches the cylindrical arc surface it is located on.

[0017] Preferably, two waste salt pyrolysis furnaces are provided, which are arranged in parallel to each other, and the two waste salt pyrolysis furnaces are respectively connected to the secondary combustion chamber through pyrolysis gas discharge pipes.

[0018] Preferably, the discharge device includes a pyrolysis discharge screw conveyor, one end of which is welded to the inner wall of one side of the oxygen-free insulation box, and the other end of which extends out from the other side of the oxygen-free insulation box and is connected to a waste salt discharge port.

[0019] The pyrolysis discharge screw conveyor is connected in sequence to a discharge gearbox and a discharge motor located outside the oxygen-free insulated box at the end furthest from the waste salt discharge port.

[0020] Preferably, the pusher driver includes a connected pusher motor, which is connected to the shield-shaped spiral pusher via a pusher gearbox.

[0021] Preferably, the waste salt pyrolysis furnace is also connected to a fault salt discharge port located outside the oxygen-free insulation box at the end near the waste salt feed pipe.

[0022] The oxygen-free insulated box is also equipped with a maintenance manhole.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] (1) This utility model sets the waste salt pyrolysis furnace and the secondary combustion chamber in an oxygen-free and heat-insulating box to ensure that the pyrolysis process is in an oxygen-free state, without the need for inert gas protection, thus ensuring the safe operation of the waste salt pyrolysis furnace and the requirement for full carbonization of organic matter.

[0025] (2) The spiral feeder used in the waste salt pyrolysis furnace is a shield-shaped spiral feeder with a size that matches the cylindrical arc surface, which ensures that the material is heated evenly, reduces turbulence, reduces dust production, and ensures continuous, stable and efficient operation of the equipment. The online rate of the equipment can reach more than 95% throughout the year.

[0026] (3) This utility model combines direct combustion, radiant heating and disturbed heating, making full use of heat while ensuring the uniformity of heating of the waste salt pyrolysis furnace. The temperature difference is no more than 25 degrees, which completely solves the problem of coking or salt sticking caused by uneven heating, and further ensures the continuous and reliable operation of this utility model.

[0027] (4) The present invention has dynamic (combustion, pyrolysis and transportation) and static (heated space) partitions, and the static space adopts a rectangular structure, which is easier to process, select materials and carry out insulation construction; the dynamic space is miniaturized, which is more conducive to the selection of dynamic equipment and materials, and ultimately makes the overall cost of the device lower and easier to manufacture.

[0028] (5) The shield-shaped spiral feeder and the high pyrolysis temperature of not less than 650 degrees Celsius installed in the waste salt pyrolysis furnace enable industrial waste salt to not only remove organic matter through pyrolysis, but also to undergo partial melting metathesis reaction and sintering process between impurity cation compounds and carbonates in this environment, thereby solidifying the impurity metal cations and filtering them out in the subsequent dissolution process, which greatly reduces the requirements for subsequent waste salt resource utilization pretreatment. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model.

[0030] Figure 2 This is the left view of the present invention.

[0031] Attached reference numerals: 1-Oxygen-free insulation box, 2-Insulation layer, 3-Secondary combustion chamber, 4-Secondary combustion chamber burner, 5-Waste salt pyrolysis furnace, 6-Shield-shaped screw conveyor, 7-Pushing gearbox, 8-Pushing motor, 9-Pyrolysis furnace discharge pipe, 10-Pyrolysis discharge screw conveyor, 11-Discharge gearbox, 12-Discharge motor, 13-Waste salt inlet pipe, 14-Waste salt outlet, 15-Waste gas exhaust pipe, 16-Support, 17-Secondary combustion chamber fixture, 18-Pyrolysis gas exhaust pipe, 19-Faulty salt discharge port, 20-Maintenance manhole. Detailed Implementation

[0032] The present invention will be described below with reference to the accompanying drawings:

[0033] See Figure 1 This utility model discloses an equipment for the oxygen-free pyrolysis treatment of industrial waste salt, including an oxygen-free heat preservation box 1, on which an insulation layer 2 is laid on the inner wall of the oxygen-free heat preservation box 1. A waste salt pyrolysis furnace 5 is fixedly installed inside the oxygen-free heat preservation box 1. A shield-shaped spiral pusher 6 is installed inside the waste salt pyrolysis furnace 5. One end of the shield-shaped spiral pusher 6 is connected to a pusher driver located outside the oxygen-free heat preservation box 1.

[0034] The waste salt pyrolysis furnace 5 is provided with a waste salt feed pipe 13 extending upward from the oxygen-free heat preservation box 1 at one end, and a discharge device is provided at the lower part of the other end of the waste salt pyrolysis furnace 5.

[0035] A secondary combustion chamber 3 is fixedly installed inside the oxygen-insulated box 1 above the waste salt pyrolysis furnace 5. The secondary combustion chamber 3 is fixedly connected to the oxygen-insulated box 1 via a secondary combustion chamber fixer 17. The secondary combustion chamber 3 is connected to the waste salt pyrolysis furnace 5 via a pyrolysis gas discharge pipe 18. An exhaust gas discharge pipe 15 extending out of the oxygen-insulated box 1 is also provided on the secondary combustion chamber 3. A pyrolysis flue gas treatment device is connected to the exhaust gas discharge pipe 15. A support 16 is provided at the bottom of the oxygen-insulated box 1.

[0036] It also includes a secondary combustion chamber burner 4 installed outside the oxygen-free insulation box 1, one end of which passes through the oxygen-free insulation box 1 and extends into the secondary combustion chamber 3.

[0037] The fuel gas and auxiliary fuel gas enter the secondary combustion chamber 3 through the secondary combustion chamber burner 4 for ignition and furnace baking. Under the heat insulation effect of the oxygen-free insulation box 1, a heating atmosphere is formed, so that the waste salt pyrolysis furnace 5 in the oxygen-free insulation box 1 is heated as a whole, thereby ensuring the uniformity of heating of the waste salt pyrolysis furnace 5, completely solving the problem of coking or salt adhesion caused by uneven heating, and further ensuring the continuous and reliable operation of this equipment.

[0038] In one embodiment, see Figure 2 The waste salt pyrolysis furnace 5 is a hollow column, and its two ends are welded to the inner walls of the oxygen-insulating and heat-preserving box 1 on both sides respectively.

[0039] The peripheral surface of the waste salt pyrolysis furnace 5 is surrounded by three cylindrical arc surfaces, two of which are arranged side by side and the other is the third arc surface. The two side-by-side arc surfaces that are close to each other are connected, and the two arc surfaces that are far apart from each other are connected through the third arc surface.

[0040] The central axes of the three cylindrical arc surfaces are set parallel to each other;

[0041] Pyrolysis furnace discharge pipes 9 are provided on both parallel arc surfaces, and the pyrolysis furnace discharge pipes 9 are connected to the discharge device.

[0042] A shield-shaped spiral feeder 6 is installed in each of the two parallel arc surfaces.

[0043] In one embodiment, two waste salt feed pipes 13 are provided on the third arc surface, and the two waste salt feed pipes 13 are respectively provided in the regions where the two parallel arc surfaces are located.

[0044] The diameters of the circles containing two parallel arc surfaces are equal.

[0045] In one embodiment, the shield-shaped spiral feeder 6 is a shield-shaped spiral feeder 6 whose size matches the cylindrical arc surface it is located on.

[0046] In one embodiment, two waste salt pyrolysis furnaces 5 are provided, which are arranged in parallel to each other, and the two waste salt pyrolysis furnaces 5 are respectively connected to the secondary combustion chamber 3 through pyrolysis gas discharge pipes 18.

[0047] The discharge device includes a pyrolysis discharge screw conveyor 10. One end of the pyrolysis discharge screw conveyor 10 is welded to the inner wall of one side of the oxygen-free insulation box 1, and the other end of the pyrolysis discharge screw conveyor 10 extends out from the other side of the oxygen-free insulation box 1 and is connected to a waste salt discharge port 14.

[0048] The end of the pyrolysis discharge screw conveyor 10 away from the waste salt discharge port 14 is connected in sequence to the discharge gearbox 11 and the discharge motor 12, which are located outside the oxygen-free insulation box 1.

[0049] The pusher driver includes a connected pusher motor 8, which is connected to the shield-shaped spiral pusher 6 via a pusher gearbox 7.

[0050] The waste salt pyrolysis furnace 5 is also connected to a fault salt discharge port 19 located outside the oxygen-free insulation box 1 at one end near the waste salt feed pipe 13.

[0051] The oxygen-free insulated box 1 is also equipped with a maintenance manhole 20.

[0052] This utility model ensures that large components such as the oxygen-free insulation box 1 are welded to the end face of the waste salt pyrolysis furnace 5, and the end face of the secondary combustion chamber 3 is welded to the oxygen-free insulation box 1. Small components such as the pusher gearbox 7 and the screw pusher are connected to the oxygen-free insulation box 1 by mechanical seals, and all external connection ports and maintenance ports are connected to the oxygen-free insulation box 1 by flanges. The micro-negative pressure operation inside the waste salt pyrolysis furnace 5 ensures that the pyrolysis process is in an oxygen-free state, without the need for inert gas protection. Essentially, this guarantees the safe operation of the pyrolysis furnace and the requirement for full carbonization of organic matter.

[0053] A method of use, comprising the following steps, for equipment used in the oxygen-free pyrolysis treatment of industrial waste salt:

[0054] 1) The fuel gas and auxiliary fuel gas enter the secondary combustion chamber 3 through the secondary combustion chamber burner 4 to ignite and heat the furnace until the temperature inside the waste salt pyrolysis furnace 5 reaches the temperature required for waste salt pyrolysis. This temperature is not less than 650 degrees and the temperature difference inside the waste salt pyrolysis furnace 5 is not greater than 25 degrees.

[0055] 2) When the discharge motor 12 is powered on, it drives the discharge gearbox 11 and the pyrolysis discharge screw conveyor 10 to operate. The waste salt is slowly transported from one end to the other end through the shield-shaped screw pusher 6. After pyrolysis, it falls into the pyrolysis discharge screw conveyor 10 through the other end for discharge. The residence time of the waste salt in the waste salt pyrolysis furnace 5 is controlled to be 30~90 minutes. Since the pyrolysis flue gas treatment device is connected to the exhaust pipe 15 and the pyrolysis flue gas treatment device is connected to the induced draft fan, the furnace is under a slight negative pressure, ensuring that the oxygen concentration in the waste salt pyrolysis furnace 5 is not greater than 0.2%.

[0056] 3) The pyrolysis gas generated during the pyrolysis of waste salt is drawn into the secondary combustion chamber 3, burned by the flame at the end of the secondary combustion chamber burner 4, and generates exhaust gas. The residence time of the pyrolysis gas in the secondary combustion chamber 3 is not less than 2 seconds, so as to carry out complete combustion and ensure that the combustible components in the pyrolysis gas are completely oxidized.

[0057] 4) The pyrolysis waste salt generated by the waste salt pyrolysis furnace 5 is discharged outside the equipment through the discharge device;

[0058] 5) When the equipment is shut down due to an accident or during scheduled maintenance, the residual waste salt in the pyrolysis furnace can be discharged from the faulty salt discharge port 19 by reversing the spiral feeder; or the oxygen-free insulation box 1 can be accessed for inspection and maintenance through the maintenance manhole 20.

[0059] Example 1:

[0060] (1) First, the composition of the waste salt needs to be tested. Specific test indicators include various inorganic salts, such as sodium sulfate, sodium chloride, sodium nitrate, sodium carbonate, etc., as well as the total organic carbon (TOC) value. According to the key components, which are generally components with low melting points, such as sodium nitrate and sodium thiosulfate, they are classified and put into different raw material tanks or raw material troughs. Then, according to the laboratory's guidance on compatibility, various types of waste salt are transported and mixed by metering screws, i.e., compatibility, and then uniformly fed into pyrolysis. The purpose of this is to ensure that the composition of the waste salt entering pyrolysis is relatively uniform within a certain range, and to ensure the effective adjustment of pyrolysis operating conditions.

[0061] (2) The equipment for feeding into the pyrolysis can be one or more of belt conveyors, screw conveyors, and bucket elevators, depending on the layout design and equipment selection of different projects;

[0062] (3) The raw material entering the equipment of the present invention for the oxygen-free pyrolysis treatment of industrial waste salt is slowly conveyed from one end to the other end through the shield-shaped spiral feeder 6 built into the waste salt pyrolysis furnace 5. The heat generated by the continuous combustion in the built-in secondary combustion chamber 3 heats the raw material in the waste salt pyrolysis furnace 5. The temperature can be controlled at 500~800℃, depending on the composition of the raw material. Usually, it is an oxygen-free operation. The TOC in the raw material is pyrolyzed into carbon under oxygen-free conditions. Some impurities such as copper, iron, calcium, magnesium, silicon and other substances react with oxygen-containing substances to generate metal oxides that are insoluble in water. After pyrolysis, the material is discharged through the other end into the pyrolysis discharge spiral conveyor 10.

[0063] (4) The exhaust gas after pyrolysis first enters the secondary combustion chamber 3 for secondary combustion. The hydrogen sulfide, carbon monoxide and other substances in it are burned into sulfur dioxide, carbon dioxide and other substances. Depending on the temperature of the exhaust gas, it is possible to choose whether heat recovery is required. Generally speaking, the exhaust gas needs to be treated by the pyrolysis exhaust gas treatment device before being discharged. The exhaust gas is discharged after being cooled, dusted, desulfurized and denitrified. The pyrolysis exhaust gas treatment device and method can be redesigned according to the composition of the exhaust gas. This type of technology is a mature technology. For example, the process route of quench tower + dry deacidification + bag dust collector + ammonia injection + SCR + induced draft fan + chimney can be adopted.

[0064] (5) When treating sodium-based waste salt whose main components are sodium chloride and sodium sulfate, if the mass ratio of sodium sulfate to sodium chloride is greater than 3:1, the operating temperature is usually 600~650℃; under this temperature condition, and when TOC is greater than 10000mg / kg, the pyrolysis time is usually 80~90 minutes, and when TOC is less than 10000mg / kg, the pyrolysis time is generally less than 70 minutes; when the mass ratio of sodium sulfate to sodium chloride is close to 1:1, the operating temperature is usually 500~550℃, and when TOC is greater than 10000mg / kg, the pyrolysis time is usually 90 minutes, and when TOC is less than 10000mg / kg, the pyrolysis time is generally 70~90 minutes.

[0065] Example 2:

[0066] (1) When treating industrial waste salt rich in sodium thiosulfate produced by the waste alkali treatment unit, the pyrolysis reaction of sodium thiosulfate should be considered in addition to the pyrolysis of TOC.

[0067] (2) When processing this type of salt, since the reaction requires a certain amount of oxygen, a certain concentration of oxygen (0% to 1%) is allowed during operation to ensure that TOC is removed while also decomposing sodium thiosulfate into gas and sodium sulfate. Finally, sodium sulfate is recovered through the salt separation device.

[0068] (3) This type of waste salt generally contains sodium sulfate and sodium carbonate in addition to sodium thiosulfate. Due to the different production process, this type of waste salt contains less hardness ions. Therefore, the operation process does not require semi-melting operation, but only solid pyrolysis. However, considering the shortening of the pyrolysis time, the pyrolysis temperature is generally 650 degrees and the pyrolysis time is 60 minutes.

[0069] (4) The waste gas generated in this process contains a certain amount of sulfur dioxide. The flue gas treatment unit needs to set up alkaline washing for deep removal until the emission meets the standards. The waste liquid (containing sodium sulfite, concentration of about 4%m) discharged from the alkaline washing periodically can be aerated and converted into sodium sulfate and then mixed into the salt separation device to produce sodium sulfate together.

[0070] Example 3:

[0071] (1) Industrial waste salt in the coal chemical industry usually has a low TOC content, less than 10,000 mg / kg. The combustible components produced by anaerobic pyrolysis are few. During pyrolysis, combustible gases need to be continuously burned for heat supply. Therefore, when this device treats industrial waste salt, a certain amount of organic waste liquid can be mixed with waste salt at the front end to reduce the amount of combustible gas.

[0072] (2) This implementation method can significantly reduce the operating cost of industrial waste salt, with a reduction rate of up to 30%.

Claims

1. Equipment for the oxygen-free pyrolysis treatment of industrial waste salt, comprising an oxygen-free insulated box, wherein the inner wall of the oxygen-free insulated box is lined with an insulation layer, characterized in that, The oxygen-free insulation box is fixedly equipped with a waste salt pyrolysis furnace, and the waste salt pyrolysis furnace is equipped with a shield-shaped spiral pusher. One end of the shield-shaped spiral pusher is connected to a pusher driver located outside the oxygen-free insulation box. The waste salt pyrolysis furnace is equipped with a waste salt feed pipe extending upward into an oxygen-free and heat-insulating box at one end, and a discharge device is provided at the lower part of the other end of the waste salt pyrolysis furnace. A secondary combustion chamber is also fixedly installed inside the oxygen-insulated box above the waste salt pyrolysis furnace. The secondary combustion chamber is connected to the waste salt pyrolysis furnace through a pyrolysis gas discharge pipe. An exhaust gas discharge pipe extending out of the oxygen-insulated box is also installed on the secondary combustion chamber. A pyrolysis flue gas treatment device is connected to the exhaust gas discharge pipe. It also includes a secondary combustion chamber burner located outside the oxygen-insulated box, with one end of the secondary combustion chamber burner passing through the oxygen-insulated box and extending into the secondary combustion chamber.

2. The equipment for the oxygen-free pyrolysis treatment of industrial waste salt as described in claim 1, characterized in that, The waste salt pyrolysis furnace is a hollow column, and its two ends are welded to the inner walls of the corresponding oxygen-insulated box. The waste salt pyrolysis furnace is surrounded by three cylindrical arc surfaces, two of which are arranged side by side and the third arc surface. The two side-by-side arc surfaces that are close to each other are connected, and the two arc surfaces that are far apart from each other are connected through the third arc surface. The central axes of the three cylindrical arc surfaces are set parallel to each other; Pyrolysis furnace discharge pipes are provided on both parallel arc surfaces, and the pyrolysis furnace discharge pipes are connected to the discharge device. A shield-shaped spiral feeder is installed in each of the two parallel arc surfaces.

3. The equipment for the oxygen-free pyrolysis treatment of industrial waste salt as described in claim 2, characterized in that, Two waste salt feed pipes are provided on the third arc surface, with the two waste salt feed pipes respectively corresponding to the areas of the two parallel arc surfaces.

4. The equipment for the oxygen-free pyrolysis treatment of industrial waste salt as described in claim 2, characterized in that, The diameters of the circles containing the two parallel arc surfaces are equal.

5. The equipment for the oxygen-free pyrolysis treatment of industrial waste salt as described in claim 2, characterized in that, The shield-shaped spiral feeder is a shield-shaped spiral feeder whose size matches the cylindrical arc surface it is located on.

6. The equipment for the oxygen-free pyrolysis treatment of industrial waste salt as described in claim 1, characterized in that, The waste salt pyrolysis furnace is configured as two parallel furnaces, and each furnace is connected to the secondary combustion chamber via a pyrolysis gas exhaust pipe.

7. The equipment for the oxygen-free pyrolysis treatment of industrial waste salt as described in claim 1, characterized in that, The discharge device includes a pyrolysis discharge screw conveyor. One end of the pyrolysis discharge screw conveyor is welded to the inner wall of one side of the oxygen-free insulation box, and the other end of the pyrolysis discharge screw conveyor passes through the other side of the oxygen-free insulation box and is connected to a waste salt discharge port. The pyrolysis discharge screw conveyor is connected in sequence to a discharge gearbox and a discharge motor located outside the oxygen-free insulated box at the end furthest from the waste salt discharge port.

8. The equipment for the oxygen-free pyrolysis treatment of industrial waste salt as described in claim 1, characterized in that, The pusher driver includes a connected pusher motor, which is connected to the shield-shaped spiral pusher via a pusher gearbox.

9. The equipment for the oxygen-free pyrolysis treatment of industrial waste salt as described in claim 1, characterized in that, The waste salt pyrolysis furnace is also connected to a fault salt discharge port located outside the oxygen-free insulation box at one end near the waste salt feed pipe. The oxygen-free insulated box is also equipped with a maintenance manhole.

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