Water-containing dangerous waste residue dewatering and drying device and process

Abstract

The invention provides a water-containing dangerous waste residue dewatering and drying device and process. The device comprises a feeding machine, a catalyst pre-drying box, an electric heating drying box, a tail gas adsorption box, a discharging hopper, a conveying belt and an induced draft fan. The invention further provides a water-containing hazardous waste residue dewatering and drying process, the water-containing hazardous waste residues are smashed into small particles through the device, and the dewatered hazardous waste residues are obtained through pre-dewatering catalyst treatment, electric heating drying treatment and tail gas adsorption. The device and the process provided by the invention are simple in flow, can realize continuous and efficient dehydration, drying and weight reduction of the water-containing dangerous waste residue material, and have good application prospects, and no harmful gas escapes in the process.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid hazardous waste treatment, and relates to a treatment device and process for water-containing hazardous waste residue materials, and specifically relates to a deep dehydration and drying device and process for water-containing hazardous waste residue materials. Background Art

[0002] During the production process, smelters inevitably produce wastewater / waste acid containing heavy metals. Generally, smelters use neutralization, sulfidation and other processes to treat such heavy metal wastewater and waste acid, transfer the heavy metals in them into solids, and achieve wastewater purification. However, a large amount of hazardous waste residues containing toxic heavy metals such as copper, zinc, lead, and arsenic are also produced. The hazardous waste residues obtained after the filter press process still contain a large amount of water (the water content ranges from 10% to 85%). At present, under the increasingly stringent environmental protection requirements, smelting companies need to invest a lot of money to treat such high-water content hazardous waste residues.

[0003] Drying hazardous waste slag can reduce its weight, thereby saving the company's hazardous waste treatment costs. However, in addition to heavy metals and moisture, hazardous waste slag from smelting companies usually contains corrosive acidic liquids, gases and gases with certain toxicity. At the same time, for some sulfide heavy metal hazardous waste slag, due to the strong viscosity of the material, it causes great difficulties in the distribution and dehydration of the hazardous waste slag.

[0004] Some companies have tried to use rotary kilns to dry and reduce the weight of hazardous waste residues, but the entire process cannot be operated unmanned, it is difficult to achieve continuous operation, and the health risks to personnel are relatively high; in addition, due to the high adsorption energy of hazardous waste solid particles on the surface free water, it also creates certain difficulties in drying and reducing the weight of hazardous waste residues, increasing costs. The patent (CN202011531925.0) discloses a method for drying arsenic sulfide residues by microwave heating, which has a good drying effect, but the continuity of feeding, drying efficiency, safety and other aspects have not yet been solved.

[0005] Therefore, it is urgent to design and develop a continuously operating, automated, safe and efficient device and process for drying and weight reduction of water-containing hazardous waste residues, so as to alleviate the burden on enterprises to a certain extent. Summary of the invention

[0006] In order to solve the above problems, the purpose of the present invention is to provide a dehydration and drying device for water-containing hazardous waste slag, which can achieve continuous, safe and efficient drying and weight reduction of water-containing hazardous waste slag, reduce the enterprise's hazardous waste slag disposal costs, and bring economic and environmental benefits to the enterprise.

[0007] Another object of the present invention is to provide a process for dehydrating and drying water-containing hazardous waste residue.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a dehydration and drying device for water-containing hazardous waste residue, including a feeder, a catalyst pre-drying box, an electric heating drying box, a tail gas adsorption box, a conveyor belt, a discharge hopper, and an induced draft fan;

[0009] Among them, the feeder, catalyst pre-drying box, electric heating drying box, tail gas adsorption box, and discharge hopper are arranged in sequence;

[0010] The conveyor belt is horizontally arranged in the middle and lower parts of the catalyst pre-drying box, the electric heating drying box, and the tail gas adsorption box;

[0011] The starting end of the conveyor belt penetrates into the feeder and is located below the feed processing unit of the feeder;

[0012] The end of the conveyor belt extends into the inlet of the discharge hopper;

[0013] The catalyst pre-drying box side wall middle and lower part or the catalyst pre-drying box bottom is connected to the catalyst pre-drying box exhaust pipe, the electric drying box top or side wall is connected to the electric drying box exhaust pipe, the tail gas adsorption box side wall is connected to the tail gas adsorption box air inlet pipe, the tail gas adsorption box is provided with a tail gas adsorption box air outlet pipe on the other side wall, the catalyst pre-drying box exhaust pipe and the electric drying box exhaust pipe are combined into an exhaust main pipe, the exhaust main pipe is connected to the air inlet end of the induced draft fan, and the air outlet end of the induced draft fan is connected to the tail gas adsorption box air inlet pipe;

[0014] The catalyst pre-drying box is provided with a catalyst storage and release component, the main body of the catalyst storage and release component is a hollow structure, the top of the main body is provided with a catalyst dosing tube, the dosing port at the end of the catalyst dosing tube is opened at the top of the catalyst pre-drying box, the bottom of the main body is provided with a plurality of injection ports parallel to the running direction of the conveyor belt, and the catalyst storage and release component is provided with a pre-dehydrated catalyst;

[0015] A mesh partition is arranged inside the tail gas adsorption box above the conveyor belt, and an alkaline adsorbent is arranged on the mesh partition.

[0016] As described above, the water-containing hazardous waste residue is arsenic sulfide residue or lime neutralized residue, and the water content of the water-containing hazardous waste residue is 10% to 85%.

[0017] As described above, the feed processing unit of the feeder is a double-roller mace, which is composed of two parallel maces, each mace is composed of a center rod and a plurality of teeth on the surface of the center rod, and the plurality of teeth are arranged alternately; a row of mud scraping teeth are arranged in parallel on both sides of the inner wall of the feeder parallel to the center rod of the mace, and the teeth of the mace are arranged alternately with the mud scraping teeth.

[0018] As described above, the teeth of the mace and the scraping teeth are columnar teeth, or the teeth of the mace and the scraping teeth are triangular teeth.

[0019] As mentioned above, the number of teeth in one circle of the mace is 3-8.

[0020] As mentioned above, the pre-dehydration catalyst is a ceramic ball with a thin layer of nanocellulose attached to the surface, and the diameter of the ceramic ball is 0.5 to 2 cm.

[0021] Nanocellulose is a highly hydrophilic substance that can compete with water-containing hazardous waste residues for water molecules, reduce the binding force between water and hazardous waste residues, and make it easier for water to evaporate and remove in the subsequent electric drying oven. With the micro-negative pressure environment formed by the induced draft fan in the catalyst pre-drying box, the nanocellulose on the surface of the ceramic ball can be continuously sprinkled onto the surface of the material in trace amounts.

[0022] As described above, the alkaline adsorbent inside the exhaust gas adsorption box is an SDG type adsorbent; the material of the conveyor belt is polytetrafluoroethylene or stainless steel; the material of the housing of the induced draft fan is an acid-resistant and corrosion-resistant material, preferably PP or PTFE.

[0023] The casing of the induced draft fan is made of acid-resistant and corrosion-resistant material because the induced draft fan discharges acidic gas. The acid-resistant and corrosion-resistant material can prevent the induced draft fan from being damaged and affecting the operation of the equipment.

[0024] The present invention also provides a dehydration and drying process for treating water-containing hazardous waste residues using the above device, comprising the following steps:

[0025] 1) Feeding: The water-containing hazardous waste residue is crushed into small particles with a particle size of 0.5-3 cm in the feeder, and sprinkled from the discharge port of the feeder onto the moving conveyor belt;

[0026] Since the water-containing hazardous waste residue is in block form, by crushing it into small particles, the surface area of ​​the water-containing hazardous waste residue is increased, which can improve the dehydration efficiency.

[0027] 2) Pre-drying: Small particles of water-containing hazardous waste slag enter the catalyst pre-drying box along the conveyor belt, and the pre-dehydrated catalyst pre-installed in the catalyst storage and release component is evenly sprinkled on the water-containing hazardous waste slag under the slightly negative pressure environment created by the induced draft fan;

[0028] 3) Electric drying: The small particles of water-containing hazardous waste slag continue to move forward with the conveyor belt and enter the electric drying box, where they are dehydrated. The dehydrated small particles of hazardous waste slag pass through the cavity at the lower end of the tail gas adsorption box and enter the discharge hopper and are collected;

[0029] 4) Tail gas adsorption: The gas generated after dehydration of water-containing hazardous waste slag is discharged into the tail gas adsorption box under the action of the induced draft fan, and the gas purified by the alkaline adsorbent is discharged through the outlet of the tail gas adsorption box.

[0030] The gases produced after dehydration of water-containing hazardous waste slag are acidic gases, such as hydrogen sulfide and sulfur dioxide, which are removed by adsorption by alkaline adsorbents, thus avoiding the emission of harmful gases into the atmosphere.

[0031] As described above, the ratio of the feeding speed in step 1) to the power of the electric drying oven in step 3) is 20-60kg / h:10KW; the amount of pre-dehydration catalyst sprinkled in step 2) is 10 micrograms of pre-dehydration catalyst per kilogram of small particles of water-containing hazardous waste residue.

[0032] The present invention crushes the blocky water-containing hazardous waste residue into small particles through the double-roller inner-rotating mace component inside the feeder, and the dehydration effect is effectively improved; the induced draft fan creates a micro-negative pressure environment in the whole device, firstly, continuously takes away the evaporated gas in the electric drying box, and improves the dehydration effect; secondly, creates a negative pressure environment in the whole device, effectively avoids the leakage of harmful gases, and is beneficial to the health of operators; thirdly, the pre-dehydration catalyst in the catalyst storage and release component is continuously sprinkled on the water-containing hazardous waste residue; the pre-dehydration catalyst is an organic hydrophilic Catalyst, a nanocellulose layer is attached to the surface of the ceramic ball. Nanocellulose is a highly hydrophilic substance that can compete with water-containing hazardous waste residues for water molecules, reduce the binding force between water and hazardous waste residues, and make it easier for water to evaporate and remove in the subsequent electric drying oven. An extremely small amount (microgram level) of catalyst can effectively reduce the binding force between water and hazardous waste residues, thereby assisting the subsequent process of dehydrating hazardous waste residues; the evaporated gas in the electric drying oven is purified through the exhaust gas adsorption box, and the acidic harmful gas therein is effectively removed, controlling the emission of harmful gases into the atmosphere.

[0033] The beneficial effects of the present invention are:

[0034] The present invention provides a dehydration and drying device and a treatment process for water-containing hazardous waste residues. The water-containing hazardous waste residues can be crushed, and the conveyor belt feeding, pre-dehydration catalyst and electric heating drying can be used for continuous and efficient dehydration and drying to reduce weight. According to the properties of the material, when the water content of the water-containing hazardous waste residues is between 50% and 85%, the weight loss rate can reach 25% to 50%; when the water content of the water-containing hazardous waste residues is between 10% and 50%, the weight loss rate can reach 0 to 30%. The entire treatment process does not require manual intervention, and no harmful gas escapes during the process, which has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the dehydration and drying equipment and process flow of water-containing hazardous waste residue.

[0036] Figure 2 Schematic diagram of the double roller mace teeth and the scraping teeth as sharp teeth inside the feeder.

[0037] Figure 3A three-dimensional schematic diagram of a single mace with sharp teeth.

[0038] Figure 4 Schematic diagram of the teeth of the double-roller mace inside the feeder and the scraper teeth being columnar teeth.

[0039] Figure 5 A three-dimensional schematic diagram of a single mace with columnar teeth.

[0040] Reference numerals

[0041] 1: feeder; 12: mace; 121: center rod; 122: teeth; 13: scraper teeth; 2: catalyst pre-drying box; 21: catalyst dosing pipe; 22: catalyst storage and release component; 23: injection port; 24: catalyst pre-drying box exhaust pipe; 3: electric drying box; 31: heating unit; 32: electric drying box exhaust pipe; 33: exhaust main pipe; 4: exhaust gas adsorption box; 41: exhaust gas adsorption box inlet pipe; 42: exhaust gas adsorption box outlet pipe; 43: mesh partition; 5: unloading hopper; 6: conveyor belt; 7: induced draft fan. DETAILED DESCRIPTION

[0042] The embodiments of the present invention will be described in detail and comprehensively below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0043] like Figure 1 The figure shows a dehydration and drying device for water-containing hazardous waste residues of the present invention, which mainly includes a feeder 1, a catalyst pre-drying box 2, an electric drying box 3, an exhaust gas adsorption box 4, a conveyor belt 6, a discharge hopper 5, and an induced draft fan 7;

[0044] Among them, a feeder 1, a catalyst pre-drying box 2, an electric drying box 3, an exhaust gas adsorption box 4, and a discharge hopper 5 are arranged in sequence;

[0045] The conveyor belt 6 is horizontally arranged through the middle and lower parts of the catalyst pre-drying box 2, the electric heating drying box 3, and the tail gas adsorption box 4;

[0046] The starting end of the conveyor belt 6 penetrates into the feeder 1 and is located below the feed processing unit of the feeder 1;

[0047] The end of the conveyor belt 6 extends into the entrance of the discharge hopper 5;

[0048] The catalyst pre-drying box 2 is connected to the catalyst pre-drying box exhaust pipe 24 at the middle and upper part of the side wall, the electric drying box 3 is connected to the electric drying box exhaust pipe 32 at the top or side wall, the exhaust gas adsorption box 4 is connected to the exhaust gas adsorption box air inlet pipe 41, and the exhaust gas adsorption box air outlet pipe 42 is arranged on the side wall opposite to the air inlet of the exhaust gas adsorption box 4, the catalyst pre-drying box exhaust pipe 24 and the electric drying box exhaust pipe 32 are merged into an exhaust main pipe 33, the exhaust main pipe 33 is connected to the air inlet end of the induced draft fan 7, and the air outlet end of the induced draft fan 7 is connected to the exhaust gas adsorption box air inlet pipe 41;

[0049] The catalyst pre-drying box 2 is provided with a catalyst storage and release component 22. The main body of the catalyst storage and release component 22 is a hollow structure. A catalyst dosing pipe 21 is provided on the top of the main body. The dosing port at the end of the catalyst dosing pipe 21 is opened on the top of the catalyst pre-drying box 2 for adding catalyst. The bottom end of the main body is parallel to the running direction of the conveyor belt 6 and is provided with a plurality of injection ports 23. A pre-dehydrated catalyst is provided in the catalyst storage and release component 22.

[0050] The top of the electric drying oven 3 is provided with a plurality of heating units 31; the heating units 31 are heating tubes, heating rods or other commercial

[0051] A mesh partition 43 is arranged inside the tail gas adsorption box 4 above the conveyor belt, and an alkaline adsorbent is arranged on the mesh partition 43, such as a commercial SDG type adsorbent.

[0052] The water-containing hazardous waste residue is arsenic sulfide residue or lime neutralized residue, and the water content of the water-containing hazardous waste residue is 10% to 85%. If the water content is lower than 10%, it does not need to be dried. If the water content exceeds 85%, the material cannot be dried due to the high water content and high viscosity. It needs to be reduced to below 85% before the device of the present invention can be used for treatment.

[0053] like Figures 2 to 5 As shown, the feeding processing unit of the feeder is a double-roller mace, which is composed of two parallel maces 12, and the mace 12 is composed of a center rod 121 and a plurality of teeth 122 on the surface of the center rod 121, and the plurality of teeth 122 are staggered; a row of scraping teeth 13 are parallelly arranged on both sides of the inner wall of the feeder parallel to the center rod 121 of the mace, and the teeth 122 of the mace are staggered with the scraping teeth 13.

[0054] The teeth of the mace and the scraping teeth can be sharp teeth (triangular teeth), such as Figure 2 and Figure 3 As shown, or columnar teeth, such as Figure 4 and Figure 5 shown.

[0055] The number of teeth in one circle of the mace is 3-8, and is 6 in the present embodiment.

[0056] The pre-dehydration catalyst is a ceramic ball with a nano-cellulose thin layer attached to the surface, and the diameter of the ceramic ball is 0.5 to 2 cm.

[0057] The alkaline adsorbent inside the exhaust gas adsorption box is SDG type adsorbent.

[0058] The conveyor belt is made of PTFE or stainless steel.

[0059] The material of the induced draft fan housing is an acid-resistant and corrosion-resistant material, preferably PP or PTFE, and PP in this embodiment.

[0060] The dehydration and drying device for water-containing hazardous waste slag provided by the present invention has a double-roller mace built in the lower part of the feeder, the saw teeth of the two maces are arranged in an alternating manner, and the double rollers are driven by a motor to rotate inward to achieve crushing of block materials and continuous and uniform feeding.

[0061] The catalyst pre-drying box has a built-in catalyst storage and release component. The catalyst storage and release component is made of corrosion-resistant organic plastic pipes. Pre-dehydrated catalyst is pre-installed inside the plastic pipes. The catalyst is continuously sprinkled on the surface of the water-containing hazardous waste slag moving with the conveyor belt under the negative pressure environment created by the induced draft fan.

[0062] The water-containing hazardous waste residue that has been catalyzed by the pre-dehydration catalyst enters the electric drying box for dehydration and drying. According to the processing scale, the electric drying box is installed in a multi-stage series manner, and the boxes are sealed and connected to each other to avoid leakage of harmful gases.

[0063] The gas evaporated in the electric drying box enters the exhaust gas adsorption box through the induced draft fan; the induced draft fan housing is made of acid-resistant and corrosion-resistant materials, including PP and PTFE.

[0064] Using the above Figure 1The device shown is a dehydration and drying process for water-containing hazardous waste residues, wherein the water-containing hazardous waste residues to be treated are poured into a feeder 1 at one time or continuously, and under the internal rotation action of the built-in double-roller mace 12 of the feeder, the hazardous waste residues are crushed by the staggered mace serrations 122 and evenly and continuously sprinkled on the conveyor belt 6 moving below; small particles of hazardous waste residues enter the catalyst pre-drying box 2 along the conveyor belt, and the pre-dehydrated catalyst pre-installed in the catalyst storage and release component 22 is continuously sprinkled onto the surface of the small particles of hazardous waste residues under the action of the induced draft fan 7. Only a very small amount of the hydrophilic organic pre-dehydration catalyst is needed to effectively reduce the binding force between the moisture and the small particles of hazardous waste residues, thereby strengthening the dehydration of the hazardous waste residues in subsequent processes, and the pre-dehydrated catalyst in the catalyst storage and release component can be dosed through the catalyst dosing pipe 21; the small particles of hazardous waste residues enter the electric drying box 3, and are quickly dehydrated under the action of the efficient heating unit 31 of the electric drying box 3; the electric The power selection of the drying box 3 is related to the material discharge speed. When the material discharge speed is 20-60kg / h, the power of the electric drying box 3 is 10KW to achieve good dehydration of small particles of hazardous waste slag. When the power of the electric drying box 3 reaches 100KW, it can withstand a material discharge speed of 10 times of 10KW; the steam generated in the electric drying box 3 is discharged through the electric drying box exhaust pipe 32 under the suction action of the induced draft fan 7, and then enters the exhaust gas adsorption box 4 through the exhaust gas adsorption box inlet pipe 41. The SDG alkaline adsorbent in the exhaust gas adsorption box effectively adsorbs harmful gases in the steam, and the purified gas is discharged into the exhaust gas main of the smelting enterprise through the exhaust gas adsorption box outlet pipe 42 for further treatment. An alkali liquid absorption system can be added at the rear end of the exhaust gas adsorption box outlet pipe to further purify the exhaust gas before discharging it into the exhaust gas main of the smelting enterprise; the small particles of hazardous waste slag that have been deeply dehydrated and dried enter the unloading hopper 5 for collection and external disposal.

[0065] After the water-containing hazardous waste slag is treated by the water-containing hazardous waste slag dehydration and drying device and process of the present invention, the moisture in the hazardous waste slag is effectively removed. For the water-containing hazardous waste slag after the plate and frame filter press commonly seen in smelting enterprises, the weight of the hazardous waste slag can be reduced by more than 30% by adopting the device and process of the present invention.

[0066] Example 1

[0067] The moisture content of arsenic sulfide slag after plate and frame filter press of a copper smelting enterprise is 50%. A certain amount of arsenic sulfide slag is placed in a feeder. The electric drying oven is two-stage series with a total power of 12kW. The conveyor belt moving speed is set to 0.5m / s. The feeding speed of the arsenic sulfide slag is adjusted by adjusting the rotation speed of the double-roller mace inside the feeder. At each feeding speed, the final weight loss of the arsenic sulfide slag is shown in Table 1 below.

[0068] Table 1

[0069] Raw material mass (kg) Processing capacity (kg / h) Weight after drying (kg) Weight loss (kg) Weight loss rate (%) 31.5 34.6 21 10.5 33.3 25.0 30.2 15.5 9.5 38.0 30 26.1 18 12 40

[0070] Example 2

[0071] The moisture content of the lime neutralization slag after the plate and frame filter press of a zinc smelting enterprise is 65%. A certain amount of lime neutralization slag is placed in the feeder. The electric drying oven is 2-stage series with a total power of 12kW. The conveyor belt moving speed is set to 0.5m / s. The feeding speed of the arsenic sulfide slag is adjusted by adjusting the rotation speed of the double-roller mace inside the feeder. At each feeding speed, the final weight loss of the lime neutralization slag is shown in Table 2 below.

[0072] Table 2

[0073] Raw material mass (kg) Processing capacity (kg / h) Weight after drying (kg) Weight loss (kg) Weight loss rate (%) 28.2 32.4 19.6 8.6 30.5 26.3 28.2 16.6 9.7 36.9 32.8 25.6 19.2 13.6 41.5

[0074] It can be seen from the above embodiments that the dehydration and drying device and treatment process for water-containing hazardous waste slag provided by the present invention can continuously and efficiently dehydrate and dry the water-containing hazardous waste slag to reduce its weight by crushing the water-containing hazardous waste slag, combining conveyor belt feeding, pre-dehydration catalyst and electric heating drying, without the need for human intervention, and without the escape of harmful gases during the process, and has good application prospects.

[0075] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A dehydration and drying device for water-containing hazardous waste residue, characterized in that: It includes feeder, catalyst pre-drying box, electric drying box, tail gas adsorption box, conveyor belt, discharge hopper and induced draft fan; Among them, the feeder, catalyst pre-drying box, electric heating drying box, tail gas adsorption box, and discharge hopper are arranged in sequence; The conveyor belt is horizontally arranged in the middle and lower parts of the catalyst pre-drying box, the electric heating drying box, and the tail gas adsorption box; The starting end of the conveyor belt penetrates into the feeder and is located below the feed processing unit of the feeder; The end of the conveyor belt extends into the inlet of the discharge hopper; The catalyst pre-drying box side wall middle and lower part or the catalyst pre-drying box bottom is connected to the catalyst pre-drying box exhaust pipe, the electric drying box top or side wall is connected to the electric drying box exhaust pipe, the tail gas adsorption box side wall is connected to the tail gas adsorption box air inlet pipe, the tail gas adsorption box is provided with a tail gas adsorption box air outlet pipe on the other side wall, the catalyst pre-drying box exhaust pipe and the electric drying box exhaust pipe are combined into an exhaust main pipe, the exhaust main pipe is connected to the air inlet end of the induced draft fan, and the air outlet end of the induced draft fan is connected to the tail gas adsorption box air inlet pipe; The catalyst pre-drying box is provided with a catalyst storage and release component, the main body of the catalyst storage and release component is a hollow structure, the top of the main body is provided with a catalyst dosing tube, the dosing port at the end of the catalyst dosing tube is opened at the top of the catalyst pre-drying box, the bottom of the main body is provided with a plurality of injection ports parallel to the running direction of the conveyor belt, and the catalyst storage and release component is provided with a pre-dehydrated catalyst; A plurality of heating units are arranged on the top of the electric drying oven; A mesh partition is arranged inside the tail gas adsorption box above the conveyor belt, and an alkaline adsorbent is arranged on the mesh partition.

2. The device for dehydrating and drying water-containing hazardous waste residue according to claim 1 is characterized in that: The water-containing hazardous waste residue is arsenic sulfide residue or lime neutralized residue, and the water content of the water-containing hazardous waste residue is 10% to 85%.

3. The device for dehydrating and drying water-containing hazardous waste residue according to claim 1 is characterized in that: The feeding processing unit of the feeder is a double-roller mace, which is composed of two parallel maces, each mace is composed of a center rod and a plurality of teeth on the surface of the center rod, and the plurality of teeth are arranged in a staggered manner; a row of mud scraping teeth are arranged in parallel on both sides of the inner wall of the feeder parallel to the center rod of the mace, and the teeth of the mace are arranged in a staggered manner with the mud scraping teeth.

4. The device for dehydrating and drying water-containing hazardous waste residue according to claim 3 is characterized in that: The teeth of the mace and the scraping teeth are columnar teeth, or the teeth of the mace and the scraping teeth are triangular teeth.

5. The device for dehydrating and drying water-containing hazardous waste residue according to claim 3 is characterized in that: The number of teeth of the mace along a circle of the central stick is 3-8.

6. The device for dehydrating and drying water-containing hazardous waste residue according to claim 1 is characterized in that: The pre-dehydration catalyst is a ceramic ball with a nanocellulose thin layer attached to the surface, and the diameter of the ceramic ball is 0.5 to 2 cm.

7. The device for dehydrating and drying water-containing hazardous waste residue according to claim 1 is characterized in that: The alkaline adsorbent inside the exhaust gas adsorption box is an SDG type adsorbent; the material of the conveyor belt is polytetrafluoroethylene or stainless steel; the material of the shell of the induced draft fan is an acid-resistant and corrosion-resistant material.

8. The device for dehydrating and drying water-containing hazardous waste residue according to claim 7 is characterized in that: The acid-resistant and corrosion-resistant material is PP or PTFE.

9. A process for dehydrating and drying water-containing hazardous waste residues using the device according to any one of claims 1 to 8, characterized in that: The steps include: 1) Feeding: The water-containing hazardous waste residue is crushed into small particles with a particle size of 0.5-3 cm in the feeder, and sprinkled from the discharge port of the feeder onto the moving conveyor belt; 2) Pre-drying: Small particles of water-containing hazardous waste slag enter the catalyst pre-drying box along the conveyor belt, and the pre-dehydrated catalyst pre-installed in the catalyst storage and release component is evenly sprinkled on the water-containing hazardous waste slag under the slightly negative pressure environment created by the induced draft fan; 3) Electric drying: The small particles of water-containing hazardous waste slag continue to move forward with the conveyor belt and enter the electric drying box, where they are dehydrated. The dehydrated small particles of hazardous waste slag pass through the cavity at the lower end of the tail gas adsorption box and enter the discharge hopper and are collected; 4) Tail gas adsorption: The gas generated after dehydration of water-containing hazardous waste slag is discharged into the tail gas adsorption box under the action of the induced draft fan, and the gas purified by the alkaline adsorbent is discharged through the outlet of the tail gas adsorption box.

10. The process for dehydrating and drying water-containing hazardous waste residue according to claim 9, characterized in that: The ratio of the feeding speed in step 1) to the power of the electric drying oven in step 3) is 20-60kg / h:10KW; In step 2), the amount of pre-dehydration catalyst sprinkled is 10 micrograms of pre-dehydration catalyst per kilogram of small particles of water-containing hazardous waste residue.

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