CN215743486U - Gamma-FeOOH catalyst synthesizer - Google Patents

Abstract

The utility model discloses a gamma-FeOOH catalyst synthesis device, which comprises a modification tank and an air drying furnace, wherein a catalyst blank formed by iron shavings pressed in a mould is alternately placed in the modification tank and the air drying furnace for reaction; the modification tank is provided with an electrolyte solution charging and discharging opening, electrolyte solution is charged into the interior of the modification tank through the electrolyte solution charging and discharging opening, the interior of the modification tank is connected with an air inlet system, and the air inlet system is arranged at the bottom of the modification tank; the air drying furnace is provided with a through air flow passage, one end of the air flow passage is in butt joint with a fan, the air outlet end of the fan in butt joint with the air drying furnace is provided with a humidifying-heating device, the bottom of the air drying furnace is also provided with a residual liquid collector, and the residual liquid collector is returned to the interior of the modification tank through a conveying pipeline.

Description

Gamma-FeOOH catalyst synthesizer

Technical Field

The utility model discloses a gamma-FeOOH catalyst synthesis device, and relates to a preparation technology of a sewage treatment catalyst with gamma-FeOOH loaded on the surface and iron shavings as a carrier.

Background

The surprising potential iron oxyhydroxides (FeOOH, especially γ -FeOOH) as functional materials for the field of sewage treatment has attracted the attention of researchers. The currently marketed gamma-FeOOH material is powdery, and because a large amount of ferrous salts and other medicaments are used in the synthesis process, the cost is high; and the powder form of the material makes the practical application scene very easy to be limited.

The waste iron shavings generated by steel processing are used as raw materials, a layer of gamma-FeOOH is formed on the surface of the iron shavings by modification and natural oxidation, so that the raw material cost for synthesizing the gamma-FeOOH can be reduced, the iron shavings can be used as a good carrier of the gamma-FeOOH, the contact area of the gamma-FeOOH and sewage in the sewage treatment process is increased, and the application scene of the gamma-FeOOH catalyst is greatly widened.

But original iron shavings present the heliciform that the size differs, directly pile up, its overall structure can be too loose, and the loading degree of difficulty is very big when using in batches under this state, and the iron base catalyst material of small batch can adopt a small amount of iron shavings to synthesize through laboratory manual operation, and the iron shavings volume that large-scale industrial production relates is great, if adopt loose structure's iron shavings to prepare according to the experimental mode directly, the iron shavings capacity that once only can handle is limited, adopt the required production time of natural oxidation process longer simultaneously, production preparation inefficiency.

Disclosure of Invention

The technical problem solved by the utility model is as follows: aiming at the problem that the gamma-FeOOH catalyst taking the iron shavings as the carrier has low production efficiency in the industrial preparation process, the efficient and stable gamma-FeOOH catalyst synthesis device is provided.

The utility model is realized by adopting the following technical scheme:

a gamma-FeOOH catalyst synthesizer comprises a modification tank 1 and an air drying furnace 2, wherein a catalyst blank 4 formed by iron shavings pressed in a mould is alternately placed in the modification tank 1 and the air drying furnace 2 for reaction;

the modifying tank 1 is provided with an electrolyte solution charging and discharging port 11, the electrolyte solution is charged into the modifying tank 1 through the electrolyte solution charging and discharging port 1, the interior of the modifying tank 1 is connected with an air inlet system 15, and the air inlet system 15 is arranged at an air inlet at the bottom of the modifying tank 1 and is provided with a micro-bubble generator 14;

the air drying furnace 2 is provided with a through air flow channel, one end of the air flow channel is in butt joint with a fan 21, the air outlet end of the fan 21 in butt joint with the air drying furnace 2 is provided with a humidifying-heating device 22, the bottom of the air drying furnace 2 is also provided with a residual liquid collector 27, the residual liquid collector 27 is connected back to the interior of the modification tank 1 through a conveying pipeline,

the automatic control unit 3 is in communication connection with the air inlet system 15, the humidifying-warming device 22 and the fan 21, and controls the automatic operation of the modification tank and the air drying furnace.

Further, in the gamma-FeOOH catalyst synthesis device, the modification tank 1 is a vertical tank body, the catalyst blank 4 is stacked in the modification tank 1 along the vertical direction, and the inner wall of the tank body of the modification tank 1 is provided with a positioning block for stacking and positioning the catalyst blank.

Furthermore, in the gamma-FeOOH catalyst synthesis device, a dissolved oxygen probe 12 is arranged inside the modification tank 1, and the dissolved oxygen probe 12 is in feedback connection with an air intake system 15 and a microbubble generator 14 through an automatic control unit 3, so that the dissolved oxygen of the electrolyte solution inside the modification tank 1 is maintained at 7-10 mg/L.

Further, in the gamma-FeOOH catalyst synthesis device, a pH probe 13 is arranged inside the modification tank 1, the modification tank 1 is also connected with an acid-base pump 17, and the pH probe 13 is in feedback connection with the acid-base pump 17 through an automatic control unit 3 to maintain the pH value of the electrolyte solution inside the modification tank 1 to be 6.0-7.2.

Further, in the gamma-FeOOH catalyst synthesis device, the modification tank 1 is further connected with a reflux pump 16, an inlet of the reflux pump 16 is butted to the bottom of the modification tank 1, and an outlet of the reflux pump 16 is butted to the top of the modification tank 1.

Further, in the gamma-FeOOH catalyst synthesis device, the air drying furnace 2 is a vertical furnace body, the catalyst blank 4 is stacked inside the air drying furnace 2 along the vertical direction, and a positioning block for stacking and positioning the catalyst blank is arranged on the inner wall of the furnace body of the air drying furnace 2.

Further, in the gamma-FeOOH catalyst synthesis device, the top and bottom openings of the air drying furnace 2 form a vertically through air flow channel, the bottom opening of the air drying furnace 2 is butted with the residual liquid collector 27, and the fan 21 is butted with the bottom opening of the air drying furnace 2 in a lateral direction.

Further, in the gamma-FeOOH catalyst synthesis device, a humidity probe 23 is arranged inside the air drying furnace 2, the humidity probe 23 is in feedback connection with a controller of the humidifying-heating device 22 through the automatic control unit 3, and the air drying temperature inside the air drying furnace 2 is controlled to be 30-45 ℃.

Further, in the gamma-FeOOH catalyst synthesis device, a temperature probe 24 is arranged inside the air drying furnace 2, and the temperature probe 24 is in feedback connection with a controller of the humidifying-heating device 22 through the automatic control unit 3 to control the humidity inside the air drying furnace 2 to be 92-98%.

Furthermore, in the gamma-FeOOH catalyst synthesis device, the top of the catalyst blank 4 is provided with a lifting handle 41 for transferring, so that the catalyst blank is conveniently transferred between the modification tank and the air drying furnace.

The catalyst raw material iron shavings adopted by the utility model are generated in the process of cutting steel, and the materials are cheap and easy to obtain and are convenient to process. The extrusion density of the iron shavings is 200-400 g/L; too low an extrusion density leads to a lower active ingredient content per unit volume, impairing the practical use, while too high an extrusion density leads to a decrease in the porosity of the catalyst and an increase in the flow resistance of the fluid medium.

The method extrudes the iron shavings into a catalyst blank with a cylindrical, square or fan-shaped structure with certain density by a mould pressing device so as to facilitate the subsequent synthesis device to modify the catalyst blank; and putting the pretreated and cleaned catalyst blank into a modification tank, injecting an electrolyte solution to immerse the catalyst blank, and starting an automatic control unit of the modification tank. When the system is in operation, the automatic control unit adjusts the gas quantity of the gas supply system according to the real-time dissolved oxygen level of the electrolyte solution. In addition, the control system can also control the operation of the acid-base adding pump according to the real-time pH value of the solution. After the treatment of the modification tank, an intermediate product 'green rust' is formed on the surface of the iron shavings of the catalyst raw blank; and transferring the catalyst blank subjected to the electrolyte soaking modification to an air drying furnace, and starting an automatic control unit of the air drying furnace. When the air drying furnace operates, the automatic controller can adjust the operation of the humidifier and the fan through the real-time temperature and humidity conditions in the unit, and further adjust and control the air humidity in the unit. After the treatment of the unit, the green rust on the surface of the blank can be converted into an active component gamma-FeOOH; and (3) circulating the catalyst blank between the modification tank and the air drying furnace for 4-5 times, so that a compact gamma-FeOOH active layer can be formed on the surface of the blank, and the final gamma-FeOOH catalyst finished product is obtained.

In the device for synthesizing the gamma-FeOOH catalyst, when the catalyst blank is transferred from the modification tank to the air drying furnace, the surface of the catalyst blank not only has the patina, but also has a thicker electrolyte solution layer, and the patina can be induced to be further converted into the gamma-FeOOH by the electrolyte solution at a very high dissolved oxygen level. And when the thickness of the liquid layer is reduced to a certain range, the forming rate of gamma-FeOOH on the surface of the liquid layer is greatly increased. Therefore, the air drying furnace automatically adjusts the reaction conditions through the automatic control unit, and actively adjusts the power of the fan and the humidifier through monitoring the temperature and the humidity of the air flow in the system in real time to ensure the thickness of the liquid layer on the surface of the catalyst blank, so that the deep modification process of the air drying furnace on the catalyst blank is ensured, the oxidation efficiency of the iron shaving is greatly improved, and the industrial preparation efficiency of the gamma-FeOOH is improved.

In conclusion, the gamma-FeOOH catalyst synthesis device disclosed by the utility model ensures that the standard modularized gamma-FeOOH catalyst can be stably synthesized on a large scale by modifying the combination of the modification tank and the air drying furnace and maintaining the optimal modification conditions by the automatic control system in each unit.

The utility model is further described with reference to the following figures and detailed description.

Drawings

FIG. 1 is a schematic view of the overall structure of a γ -FeOOH catalyst synthesis apparatus of an embodiment.

FIG. 2 is a schematic view of a configuration of a reforming pot in an example.

FIG. 3 is a schematic view of the structure of the air drying furnace in the embodiment.

Reference numbers in the figures:

1-a modification tank, 11-an electrolyte solution charging and discharging port, 12-a dissolved oxygen probe, 13-a pH probe, 14-a microbubble generator, 15-an air inlet system, 16-a reflux pump, 17-an acid-base pump,

2-air drying furnace, 21-blower, 22-humidifying-warming device, 23-humidity probe, 24-temperature probe, 25-blower controller, 26-humidifying-warming controller, 27-residual liquid collector,

3-an automatic control unit for controlling the operation of the device,

4-catalyst blank, 41-hoisting handle.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only a few embodiments of the utility model, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses.

Examples

As shown in FIG. 1, the gamma-FeOOH catalyst synthesis device shown in the figure is a preferred scheme of the utility model, and specifically comprises a modification tank 1, an air drying furnace 2 and an automatic control unit 3, wherein, the interior of the modification tank 1 is filled with electrolyte solution, a catalyst blank 4 formed by iron shavings pressed in a mould is immersed in the electrolyte solution of the modification tank 1, electrolyte dipping modification is carried out on the iron shavings of the catalyst blank 4, the modified catalyst blank 4 in the modification tank 1 is transferred into an air drying furnace 2, the rapid oxidation is carried out through the air current circulating in the air drying furnace 2, the catalyst blank 4 is alternately arranged in the modification tank 1 and the air drying furnace 2 for reaction, compact gamma-FeOOH is formed on the surface of the iron shavings, and the reaction conditions in the modification tank 1 and the air drying furnace 2 are automatically adjusted and controlled through the automatic control unit 3.

When the modifying tank is in operation, ferrous ions and ferric ions can be generated on the surface of the iron shavings of the catalyst blank through oxygen absorption corrosion, and the ions are complexed with other anions and converted into green rust. When the air drying furnace is in operation, under the ventilation condition, the residual electrolyte solution on the iron shavings of the catalyst blank can continuously initiate oxygen absorption corrosion, and the degree of the electrolyte solution is far greater than that in the modification tank. And under the ventilation condition, when the thickness of the liquid film on the surface of the blank is reduced to a certain degree, the oxygen absorption corrosion rate is further improved, and the patina begins to be converted into gamma-FeOOH. And after the cyclic treatment of the air drying furnace for 4-5 times, a compact gamma-FeOOH active layer is formed on the surface of the catalyst blank.

Specifically, as shown in fig. 2, the modification tank 1 of the present embodiment is provided with an electrolyte solution charging/discharging port 11, the electrolyte solution charging/discharging port 11 is connected to an electrolyte solution delivery pump through a valve, the electrolyte solution is charged into the modification tank 1 through the electrolyte solution charging/discharging port 1, and the electrolyte solution charging/discharging port 11 is located at the bottom of the side surface of the modification tank 1. Meanwhile, the interior of the modification tank 1 is connected with an air inlet system 15, the air inlet system 15 can directly adopt a mature fan system to introduce external air into the interior of the modification tank 1 for aeration, a micro-bubble generator 14 is arranged at an air inlet of the air inlet system 15, which is arranged at the bottom of the modification tank 1, the micro-bubble generator 14 adopts a micro-nano-bubble generator, and fine micro-bubbles with the diameter of 20-80 microns are generated in the interior of the modification tank 1 by the air introduced by the air inlet system 15 for aeration.

The modification tank 1 of this embodiment is a vertical tank body, catalyst blank 4 piles up inside modification tank 1 along vertical direction, the internal wall bottom of jar of modification tank 1 is equipped with the locating piece that is used for catalyst blank to pile up the location, the catalyst blank 4 that is located modification tank 1 bottommost passes through the locating piece to be fixed in modification tank 1 bottom, and fill the mouth with the electrolyte solution of bottom and keep a certain distance with the microbubble generator, other catalyst blanks 4 then directly pile up and place on the catalyst of bottommost layer is former blank in advance, guarantee that all catalyst blanks all submerge in the electrolyte solution of modification tank 1, electrolyte solution can get into in the compressed iron shavings gap in the catalyst blank, with iron shavings raw materials abundant contact reaction.

A dissolved oxygen probe 12 and a pH probe 13 are arranged in the modification tank 1 and are connected with an acid-base pump 17, wherein the dissolved oxygen probe 12 is in feedback connection with an air intake system 15 and a microbubble generator 14 through an automatic control unit 3, the air volume of the air intake system is adjusted according to a feedback signal of the dissolved oxygen probe 12, and the dissolved oxygen of the electrolyte solution in the modification tank 1 is maintained at 7-10 mg/L; the pH probe 13 is in feedback connection with an acid-base pump 17 through an automatic control unit 3, the acid-base addition of the electrolyte solution in the modification tank is adjusted according to a feedback signal of the pH probe 13, the pH value of the electrolyte solution in the modification tank 1 is maintained to be 6.0-7.2, the electrolyte solution is an important guarantee for forming a gamma-FeOOH active layer on the surface of the catalyst blank, and other types of FeOOH (such as alpha-FeOOH and beta-FeOOH) can be avoided; and the proper pH range can enable the surface of the catalyst blank to form the important precursor of gamma-FeOOH, namely the patina, and the formation of the patina is not facilitated by over-high or over-low pH.

This embodiment is in order to further improve the modified efficiency of catalyst plumule 4 in modified 1 inside jars, modified jar 1 still is equipped with backwash pump 16, backwash pump 16's import dock to modified jar 1 bottom, backwash pump 16's export dock to modified jar 1 top, through containing the electrolyte solution of a large amount of dissolved oxygen to modified jar 1 top through backwash pump 16 circulating pump with modified jar 1 bottom, a distribution for the electrolyte in the keeping device is even, avoid local pH, the unbalance of dissolved oxygen, improve the catalyst plumule reaction efficiency that modified 1 upper portion was piled up, guarantee that all catalyst plumules that modified 1 inside was piled up can both produce unanimous modified reaction effect, the catalyst quality of large-scale production has further been promoted.

As shown in fig. 3, the air drying furnace 2 of this embodiment forms a through air flow channel, the catalyst blank 4 is placed inside the air flow channel, a blower 21 is disposed in the air flow channel in a butt joint manner, the blower rapidly circulates air flow introduced into the air drying furnace from gaps between the iron shavings of the catalyst blank in the air flow channel to rapidly air-dry the catalyst blank, a humidifying-heating device 22 is disposed at an air outlet end of the blower 21 in a butt joint manner with the air drying furnace 2 to heat and humidify the air flow introduced into the air drying furnace 2. If the inlet air humidity is low, the surface drying degree of the top catalyst blank and the bottom in the air drying furnace is not uniform at the same time during air drying, and when the bottom is completely air-dried, the top can be extremely wet. The humidification is to improve the condition of uneven humidity of the upper layer and the lower layer of the air drying furnace as much as possible, ensure that the modification environment difference of all catalyst blanks in the air drying furnace is not large, and ensure the reaction consistency of all catalyst blanks stacked in the air drying furnace 2.

Specifically, the air-dry stove 2 of this embodiment adopts vertical furnace body, and catalyst embryo 4 piles up inside air-dry stove 2 along vertical direction, and the furnace body inner wall of air-dry stove 2 is equipped with and is used for the catalyst embryo to pile up the locating piece of location, and is the same with modified jar 1, and the catalyst embryo 4 that is located air-dry stove 2 bottommost passes through the locating piece to be fixed in the bottom of air-dry stove 2, and other catalyst embryos 4 then directly pile up and place on the catalyst embryo in advance of bottommost. The top and the bottom opening at air-dry stove 2 form vertical through-going airflow channel, and catalyst embryo 4 piles up and places in airflow channel, and the bottom opening and the raffinate collector 27 of air-dry stove 2 dock, collect the electrolyte solution that air-dry 2 inside catalyst embryos of air-dry stove dropped in-process to with raffinate collector 27 through transfer line return to connect to inside modification tank 1, realize electrolyte solution's circulation recycle. In order not to affect the positional arrangement of the fan 21 and the residual liquid collector, the fan 21 is laterally butted against the bottom opening of the air drying furnace 2.

The air drying furnace 2 is internally provided with a humidity probe 23 and a temperature probe 24 which are used for adjusting the operation of the humidification-warmer 22 and the fan 21 according to the real-time air condition in the air drying furnace 2, the humidity probe 23 is in feedback connection with a humidification-warming controller 26 of the humidification-warmer 22 through an automatic control unit 3, the air drying temperature in the air drying furnace 2 is controlled to be 30-45 ℃, the temperature probe 24 is arranged in the air drying furnace 2, the temperature probe 24 is in feedback connection with a controller of the humidification-warmer 22 through the automatic control unit 3, and the humidity in the air drying furnace 2 is controlled to be 92-98%.

In order to facilitate the transportation of catalyst proembryo 4 between modified jar 1 and air-dry stove 2 to remove, modified jar 1 all sets up the top cap that the top can be opened with air-dry stove 2 in this embodiment, all is equipped with the gas outlet on the top cap, and the frame main part top of catalyst proembryo 4 sets up hoist and mount handle 41, is convenient for hoist and mount the catalyst proembryo.

Referring again to fig. 1, the automatic control unit 3 in this embodiment is in communication with the air intake system 15 of the modification tank 1, the microbubble generator 14, the ph pump 17, the humidification-warmer 22 of the air drying furnace 2, and the blower 21, and controls the automatic operation of the modification tank and the air drying furnace. The automatic control unit 3 receives the detection signals of the dissolved oxygen probe 12, the pH probe 13, the humidity probe 23 and the temperature probe 24, wherein, the automatic control unit 3 can control the operation of the air inlet system and the acid-base pump according to the electrolyte condition fed back by the pH/dissolved oxygen probe, so that the air inlet system and the acid-base adding pump can blow gas into the modification tank 1 and inject acid-base medicament, further stabilizing the pH value and the dissolved oxygen of the electrolyte in a proper range, stably modifying the catalyst blank, the operation of the humidifying and heating controller and the fan controller is adjusted according to the air state in the air drying furnace 2 fed back by the temperature/humidity probe to indirectly control the operation power of the humidifying-heating device 22 and the fan 21, further, the humidity and the temperature of the air in the air drying furnace 2 are stabilized in a proper range, so that the modification of the catalyst blank is rapidly and stably carried out.

The automatic control unit 3 in this embodiment may be programmed by using a PLC controller, and the specific communication connection manner and the control circuit design of the PLC controller are both conventional automatic control technologies, and this embodiment aims to provide a hardware solution for automatically controlling a synthesis apparatus for producing a γ -FeOOH catalyst, and the specific signal communication and control circuit of the automatic control unit 3 are conventional designs that can be performed by those skilled in the art, and this embodiment is not described herein again.

In this embodiment, the specific operation process for synthesizing and producing the γ -FeOOH catalyst by using the iron shavings subjected to compression molding as the carrier is as follows:

(1) removing residual oil on the surface of the iron shavings by using waste water, and extruding the iron shavings into a catalyst blank with a cylindrical, square or fan-shaped structure with certain density by using a mould pressing device so as to modify the catalyst blank by using a subsequent synthesis device;

(2) and (2) putting the catalyst blank processed in the step (1) into a modification tank, then injecting an electrolyte solution to immerse the blank, and starting an automatic control unit of the modification tank. The automatic control unit will adjust the gas capacity of the gas supply system according to the real-time dissolved oxygen level of the electrolyte solution. In addition, the control system can also control the operation of the acid-base adding pump according to the real-time pH value of the solution. After the treatment of the modification tank, an intermediate product 'green rust' is formed on the surface of the iron shavings of the catalyst raw blank;

(3) and (3) transferring the catalyst blank processed in the step (2) to an air drying furnace, and starting an automatic control unit of the air drying furnace. The automatic control unit can adjust the operation of the humidifying-heating device and the fan through the real-time temperature and humidity conditions in the air drying furnace, and further adjust and control the air humidity in the air drying furnace. After the treatment of the air drying furnace, the green rust on the surface of the blank can be converted into an active component gamma-FeOOH;

(4) and (3) circulating the step (2) and the step (3) for 4-5 times, and forming a compact gamma-FeOOH active layer on the iron shaving surface of the catalyst blank to obtain a final gamma-FeOOH catalyst finished product.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art.

Claims (10)

1. A gamma-FeOOH catalyst synthesis device is characterized in that: comprises a modification tank (1) and an air drying furnace (2), wherein a catalyst blank (4) formed by iron shavings pressed in a mould is alternately placed in the modification tank (1) and the air drying furnace (2) for reaction;

the modified tank (1) is provided with an electrolyte solution charging and discharging port (11), the electrolyte solution is charged into the modified tank (1) through the electrolyte solution charging and discharging port (1), the modified tank (1) is connected with an air intake system (15), and the air intake system (15) is arranged at an air inlet at the bottom of the modified tank (1) and is provided with a micro-bubble generator (14);

the air drying furnace (2) is provided with a through airflow channel, one end of the airflow channel is in butt joint with a fan (21), the air outlet end of the fan (21) in butt joint with the air drying furnace (2) is provided with a humidifying-heating device (22), the bottom of the air drying furnace (2) is also provided with a residual liquid collector (27), the residual liquid collector (27) is connected back to the interior of the modification tank (1) through a conveying pipeline,

the automatic humidifier also comprises an automatic control unit (3), wherein the automatic control unit (3) is in communication connection with the air inlet system (15), the humidifying-warming device (22) and the fan (21).

2. The apparatus for synthesizing γ -FeOOH catalyst according to claim 1, wherein: the modified tank (1) is a vertical tank body, the catalyst blank (4) is stacked in the modified tank (1) along the vertical direction, and the inner wall of the tank body of the modified tank (1) is provided with a positioning block for stacking and positioning the catalyst blank.

3. The apparatus for synthesizing γ -FeOOH catalyst according to claim 2, wherein: modified jar (1) inside is equipped with dissolved oxygen probe (12), dissolved oxygen probe (12) are through automatic control unit (3) and air intake system (15) and microbubble generator (14) feedback connection.

4. The apparatus for synthesizing γ -FeOOH catalyst according to claim 3, wherein: the modified tank (1) is internally provided with a pH probe (13), the modified tank (1) is also connected with an acid-base pump (17), and the pH probe (13) is connected with the acid-base pump (17) in a feedback manner through an automatic control unit (3).

5. The apparatus for synthesizing γ -FeOOH catalyst according to claim 4, wherein: the modification tank (1) is also connected with a reflux pump (16), an inlet of the reflux pump (16) is butted to the bottom of the modification tank (1), and an outlet of the reflux pump (16) is butted to the top of the modification tank (1).

6. The apparatus for synthesizing γ -FeOOH catalyst according to claim 1, wherein: air-dry stove (2) and be vertical furnace body, catalyst embryo (4) are piled up inside air-dry stove (2) along vertical direction, the furnace body inner wall of air-dry stove (2) is equipped with and is used for the catalyst embryo to pile up the locating piece of location.

7. The apparatus of claim 6, wherein: the top and bottom openings of the air drying furnace (2) form a vertical through airflow channel, the bottom opening of the air drying furnace (2) is butted with a residual liquid collector (27), and the fan (21) is butted with the bottom opening of the air drying furnace (2) in the lateral direction.

8. The apparatus of claim 7, wherein: the air drying furnace (2) is internally provided with a humidity probe (23), and the humidity probe (23) is connected with a controller of the humidifying-heating device (22) in a feedback manner through an automatic control unit (3).

9. The apparatus for synthesizing γ -FeOOH catalyst according to claim 8, wherein: the air drying furnace (2) is internally provided with a temperature probe (24), and the temperature probe (24) is in feedback connection with a controller of the humidifying-heating device (22) through an automatic control unit (3).

10. The apparatus for synthesizing γ -FeOOH catalyst according to claim 2 or 6, wherein: and a hoisting handle (41) for transportation is arranged at the top of the catalyst blank (4).

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