Combustion product recycling device for metallurgical micro powder preparation

Abstract

The utility model discloses a recycling device for combustion products prepared from metallurgical micro powder, and belongs to the technical field of metallurgical micro powder preparation. The micro iron powder prepared by the micro iron powder preparation device is stored, and heat generated in the preparation process is conveyed to a park heating system to be recycled; the stored micro iron powder is combusted through a micro powder combustion device to generate iron oxide powder, heat generated in the process is converged into a park heating system, and generated flue gas enters a waste heat boiler for secondary utilization; the waste heat boiler exchanges heat to generate low-temperature flue gas, and the low-temperature flue gas enters the dust removal system to be subjected to dust removal and then returns to the micro iron powder preparation system to be used for cooling the micro iron powder. The iron oxide powder is reduced through the iron oxide hydrogen reduction system to obtain pure iron powder, and the pure iron powder is recycled into the micro iron powder preparation system and participates in preparation of the micro iron powder again. According to the utility model, the cooperative work of all systems is realized, the heat generated in the production process is efficiently utilized, the pollutant discharge is reduced, and the efficiency and the stability of the whole production process are improved.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical micro powder preparation technology, and relates to a combustion product recycling device for metallurgical micro powder preparation. Background Technology

[0002] In the field of metallurgical micro powder preparation and related energy utilization, current technological applications face many problems that urgently need to be solved. These problems not only cause waste of resources, but also have a significant negative impact on the environment.

[0003] On the one hand, in existing technologies, the preparation process of micro iron powder suffers from severe heat loss. The preparation of micro iron powder typically involves a series of complex physical and chemical processes, which often require a large amount of energy. However, due to limitations in process design and equipment performance, a significant amount of heat is not effectively collected and utilized, but instead dissipates into the surrounding environment in various forms.

[0004] On the other hand, traditional heating methods mainly rely on burning coal or natural gas to provide heat energy. During combustion, coal and natural gas release large amounts of pollutants such as carbon dioxide, sulfur oxides, and nitrogen oxides. Carbon dioxide is a major greenhouse gas, and its large-scale emissions exacerbate global warming, posing a serious threat to the Earth's ecological balance and the sustainable development of human society. Sulfur oxides and nitrogen oxides are important precursors to air pollution problems such as acid rain and smog, severely impacting air quality, harming human health, and damaging the ecological environment.

[0005] Given the dual problems of large heat loss in the preparation process of micro-iron powder and serious pollution from traditional heating methods in the existing technology, developing a device that can realize the recycling of combustion products in the preparation of metallurgical micro-powder is of great practical significance. Utility Model Content

[0006] The purpose of this invention is to provide a combustion product recycling device for the preparation of metallurgical micro powders, so as to solve the technical problems of large heat loss and high pollutant emissions in the preparation process of micro iron powders and traditional heating methods.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model provides a device for recycling combustion products prepared from metallurgical micro powders, comprising:

[0009] A micro iron powder preparation system, comprising a micro iron powder preparation device; the micro iron powder generated by the micro iron powder preparation device is stored in a micro iron powder supply box, and the outlet of the micro iron powder supply box is connected to a steam heating system for an iron powder combustion boiler;

[0010] The iron powder combustion boiler steam heating system includes an iron powder combustion device and a waste heat boiler. The iron powder combustion device is connected to an iron powder feeding box and is used to burn iron powder to obtain iron oxide powder. The iron oxide powder is then transported to an iron oxide hydrogen reduction system. The heat generated by the iron powder combustion device enters the park heating system, and the flue gas generated enters the waste heat boiler.

[0011] The park heating system includes a heat exchange station and a heating device connected in sequence; the inlet of the heat exchange station is connected to an iron powder combustion device.

[0012] The iron oxide hydrogen reduction system is used to reduce iron oxide to obtain pure iron powder, and the pure iron powder is returned to the micro iron powder preparation system through the iron powder conveying system.

[0013] Furthermore, the micro iron powder preparation device includes a granulation chamber; a through hole is provided at the top center of the granulation chamber for molten iron to flow in; a nitrogen nozzle and a water atomizing nozzle are also installed at the top of the granulation chamber, and the granulated iron micro powder enters the iron micro powder storage box through the outlet on one side of the bottom of the granulation chamber; the iron micro powder storage box is connected to the micro iron powder feeding box through a hopper elevator.

[0014] Furthermore, the inner wall of the granulation chamber is provided with a first water-cooled wall, which is connected to a first steam drum; the first steam drum is connected to a heat exchange station.

[0015] Furthermore, the iron powder combustion device includes an iron powder combustion furnace; a flue gas outlet is provided on one side of the iron powder combustion furnace and connected to a waste heat boiler; an iron powder burner is provided on the other side of the iron powder combustion furnace and connected to a micro iron powder feeding box; a second water-cooled wall is provided on the inner wall of the iron powder combustion furnace; the second water-cooled wall is connected to a second steam drum outside the iron powder combustion furnace and the second steam drum is connected to a heat exchange station.

[0016] Furthermore, a conical iron oxide powder collection area is provided at the bottom of the iron powder combustion furnace; an impeller feeder is installed at the bottom outlet of the iron oxide powder collection area.

[0017] Furthermore, a buried tube heat exchanger is installed in the iron oxide powder collection area, and the buried tube heat exchanger is connected to the second water-cooled wall.

[0018] Furthermore, the outlet of the heating device is sequentially connected to a return water station, a demineralized water tank, and a deaerator; the deaerator is connected to a waste heat boiler.

[0019] Furthermore, the flue gas outlet of the waste heat boiler is connected to a dust removal system; the dust removal system is connected to the bottom of the micro iron powder preparation device via a circulating fan, and is used to cool the micro iron powder prepared.

[0020] Furthermore, the iron oxide hydrogen reduction system includes an iron oxide reduction belt, a slow cooling belt of the reduction furnace, a rapid cooling belt of the reduction furnace, a nitrogen device, and an ammonia decomposition device; the iron powder in the micro iron powder feeding box passes through the iron oxide reduction belt, the slow cooling belt of the reduction furnace, and the rapid cooling belt of the reduction furnace in sequence via a steel belt to obtain pure iron powder; the steel belt is connected to a passive roller and a driving roller respectively, and the driving roller is connected to a variable frequency motor; the nitrogen device and the ammonia decomposition device provide nitrogen and hydrogen to the iron oxide reduction belt respectively.

[0021] Furthermore, an iron powder thickness adjustment plate is also provided at the entrance of the iron oxide reduction zone.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention discloses a combustion product recycling device for metallurgical micro-powder preparation. The micro-iron powder prepared by the micro-iron powder preparation device is stored, and the heat generated during the preparation process is transferred to the park's heating system for recycling. The stored micro-iron powder is burned by a micro-powder combustion device to generate iron oxide powder, and the heat generated during this process is fed into the park's heating system. The resulting flue gas is then recycled into a waste heat boiler. The waste heat boiler generates low-temperature flue gas, which is then removed by a dust removal system and returned to the micro-iron powder preparation system for cooling the micro-iron powder. The iron oxide powder is reduced to pure iron powder through an iron oxide hydrogen reduction system, which can then be recycled back to the micro-iron powder preparation system for further micro-iron powder preparation. This invention integrates multiple systems, including micro-iron powder preparation, combustion heating, park heating, and iron oxide hydrogen reduction, achieving synergistic operation between these systems. It efficiently utilizes the heat generated during production, reduces pollutant emissions, and improves the efficiency and stability of the entire production process. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a combustion product recycling device for metallurgical micro powder preparation according to the present invention.

[0026] Figure 2 This is a schematic diagram of the steam heating system of the iron powder combustion boiler of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the iron oxide hydrogen reduction system of this utility model.

[0028] Wherein: 1-Fine iron powder preparation system; 101-Fine iron powder feeding box; 102-Granulation chamber; 103-Fine iron powder storage box; 104-Hopper elevator; 105-First steam drum; 2-Fine iron powder combustion boiler steam heating system; 201-Waste heat boiler; 202-Fine iron powder combustion furnace; 203-Fine iron powder burner; 204-Second water-cooled wall; 205-Second steam drum; 206-Iron oxide powder collection area; 207-Impeller feeder; 208-Demineralized water tank; 209-Deaerator; 21 0-Dust removal system; 211-Circulating fan; 3-Park heating system; 301-Heat exchange station; 302-Heating device; 303-Return water station; 4-Iron oxide hydrogen reduction system; 401-Iron powder conveying system; 402-Iron oxide reduction belt; 403-Reduction furnace slow cooling belt; 404-Reduction furnace rapid cooling belt; 405-Steel belt; 406-Passive roller; 407-Active roller; 408-Variable frequency motor; 409-Iron powder thickness adjustment plate; 410-Nitrogen device; 411-Ammonia decomposition device. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] The present invention will now be described in further detail with reference to the accompanying drawings:

[0036] See Figure 1This utility model discloses a combustion product recycling device for metallurgical micropowder preparation, comprising a micro iron powder preparation system 1, a micro iron powder combustion boiler steam heating system 2, a park heating system 3, and an iron oxide hydrogen reduction system 4. Specifically, the micro iron powder preparation system 1 includes a micro iron powder preparation device; the outlet of the micro iron powder preparation device is connected to a micro iron powder feeding box 101, and the generated micro iron powder is stored in the micro iron powder feeding box 101. The outlet of the micro iron powder feeding box 101 is connected to the micro iron powder combustion boiler steam heating system 2. The micro iron powder combustion boiler steam heating system 2 includes a micro iron powder combustion device and a waste heat boiler 201; the micro iron powder combustion device is connected to the micro iron powder feeding box 101 and is used to burn micro iron powder to obtain iron oxide powder, which is then transported to the iron oxide hydrogen reduction system 4; the micro iron powder combustion device is also connected to the park heating system 3 and the waste heat boiler 201 through pipes, respectively, with the generated heat entering the park heating system 3 and the generated flue gas entering the waste heat boiler 201. The park heating system 3 includes a heat exchange station 301 and a heating device 302 connected in sequence; the inlet of the heat exchange station 301 is connected to an iron powder combustion device. The iron oxide hydrogen reduction system 4 is used to reduce iron oxide to obtain pure iron powder, and the pure iron powder is returned to the iron powder preparation system 1 through the iron powder conveying system 401. In this embodiment, while the iron powder combustion boiler steam heating system 2 burns iron powder to produce iron oxide powder, the heat generated is effectively utilized in the park heating system 3 to provide heating services for the park, realizing the cascade utilization of energy and improving the comprehensive energy utilization efficiency. The flue gas generated by the iron powder combustion device enters the waste heat boiler 201 to further recover the waste heat in the flue gas, which can be used to generate steam or other heat energy needs, reducing energy waste and lowering production costs. By returning the pure iron powder obtained from the iron oxide hydrogen reduction system 4 to the iron powder preparation system 1, the recycling of iron resources is realized, improving resource utilization, reducing raw material consumption and waste generation, which is in line with the concept of sustainable development.

[0037] In one feasible embodiment of this utility model, the micro iron powder preparation device includes a granulation chamber 102; a through hole is provided at the top center of the granulation chamber 102 for molten iron to flow in; a nitrogen nozzle and a water atomizing nozzle are also installed at the top of the granulation chamber 102, and the granulated iron micro powder enters the iron micro powder storage tank 103 through an outlet on one side of the bottom of the granulation chamber 102; the iron micro powder storage tank 103 is connected to the micro iron powder feeding tank 101 via a hopper elevator 104. The inner wall of the granulation chamber 102 is provided with a first water-cooled wall, and the first water-cooled wall is connected to a first steam drum 105; the first steam drum 105 is connected to a heat exchange station 301. In this embodiment, pure iron powder is heated in a smelting furnace to become molten iron, which flows into the granulation chamber 102 to form a column of molten iron. Under the action of high-pressure nitrogen and high-pressure water, it is jet-granulated to prepare micro iron powder. The heat generated in the process and the liquid heat exchange in the water-cooled wall are collected and saturated steam is generated in the first steam drum 105. The saturated steam can be further fed into the heat exchange station 301 for recycling. The flue gas generated in the granulation chamber 102 can also be fed into the waste heat boiler 201 for recycling.

[0038] In one feasible embodiment of this utility model, see [link to relevant documentation]. Figure 2 The iron powder combustion device includes an iron powder combustion furnace 202; a flue gas outlet is provided on one side of the iron powder combustion furnace 202, connected to a waste heat boiler 201; an iron powder burner 203 is provided on the other side of the iron powder combustion furnace 202, the iron powder burner 203 is connected to a micro iron powder supply box 101, and is designed with two air supply points; a second water-cooled wall 204 is provided on the inner wall of the iron powder combustion furnace 202; the second water-cooled wall 204 is connected to a second steam drum 205 outside the iron powder combustion furnace 202, and the second steam drum 205 is connected to a heat exchange station 301. A conical iron oxide powder collection area 206 is provided at the bottom of the iron powder combustion furnace 202; an impeller feeder 207 is installed at the bottom outlet of the iron oxide powder collection area 206. A buried tube heat exchanger 212 is installed in the iron oxide powder collection area 206, and the buried tube heat exchanger 212 is connected to the second water-cooled wall 204. In this embodiment, the waste heat boiler 201 adopts a cylindrical structure, with internal insulation made of zirconium-containing aluminum silicate fiber and an inner liner made of 310S stainless steel. The cylinder and elliptical end caps of the second steam drum 205 are made of 345R steel. The pressure vessel steel plate is manufactured, inspected, and accepted according to GB150. The boiler has a small footprint, saving floor space, and its flue gas treatment section is simpler than that of a coal-fired fluidized bed boiler. The iron powder channel is located at the center of the iron powder burner 203. A compressed air pipeline is installed at the center of the channel to inject the iron powder. The iron powder outlet is equipped with a Laval nozzle structure to achieve primary air injection and preliminary mixing of the iron powder. The oxygen pipe sends pure oxygen gas to the annular gas channel inside the burner, and oxygen is injected through eight evenly distributed branch pipes to achieve secondary air to fully mix and assist combustion of the iron powder, generating iron oxide powder. The reaction formula is:

[0039] 3Fes + 2O2g → Fe3O4s + 3354.96kJ

[0040] It is known that 1g of metallic iron releases 19.97kJ of heat when burned in oxygen. The boiler emits no carbon dioxide, no nitrogen dioxide, and no sulfur dioxide.

[0041] In one feasible embodiment of this utility model, the outlet of the heating device 302 is sequentially connected to the return water station 303, the demineralized water tank 208, and the deaerator 209; the deaerator 209 is connected to the waste heat boiler 201. The flue gas outlet of the waste heat boiler 201 is connected to the dust removal system 210; the dust removal system 210 is connected to the bottom of the micro iron powder preparation device via a circulating fan 211 for cooling the prepared micro iron powder.

[0042] In one feasible embodiment of this utility model, see [link to relevant documentation]. Figure 3 The iron oxide hydrogen reduction system 4 includes an iron oxide reduction belt 402, a reduction furnace slow cooling belt 403, a reduction furnace rapid cooling belt 404, a nitrogen device 410, and an ammonia decomposition device 411. The iron powder in the micro iron powder feeding box 101 passes through the iron oxide reduction belt 402, the reduction furnace slow cooling belt 403, and the reduction furnace rapid cooling belt 404 in sequence via a steel belt 405 to obtain pure iron powder. The steel belt 405 is connected to a passive roller 406 and a drive roller 407, respectively, and the drive roller 407 is connected to a variable frequency motor 408. An iron powder thickness adjustment plate 409 is also provided at the inlet of the iron oxide reduction belt 402. The nitrogen device 410 and the ammonia decomposition device 411 provide nitrogen and hydrogen to the iron oxide reduction belt 402, respectively. In this embodiment, hydrogen gas generated by ammonia decomposition is used as a reducing agent, and nitrogen gas is used as a protective gas inside the furnace. The reduction furnace is divided into sections with temperature control, and slow cooling and rapid cooling sections are set up, resulting in good reduction effect. Iron powder combustion produces Fe3O4, and Fe3O4 + 4H2 = 3Fe + 4H2O. After passing through a continuous belt-type iron oxide hydrogen reduction furnace, Fe powder is produced and enters the boiler for repeated combustion.

[0043] The working principle of this utility model is as follows:

[0044] The micro iron powder preparation device prepares micro iron powder and stores it in the micro iron powder supply box 101; the heat generated during the preparation process is transported to the heat exchange station 301 of the park heating system 3.

[0045] The micro iron powder is burned in the micro powder combustion device to generate iron oxide powder. The heat generated in the process is collected into the heat exchange station 301, and the generated flue gas enters the waste heat boiler 201 for secondary utilization. The waste heat boiler 201 generates low-temperature flue gas through heat exchange. The low-temperature flue gas enters the dust removal system 210 for dust removal and then returns to the micro iron powder preparation system 1 for cooling the micro iron powder.

[0046] Iron oxide powder is reduced in iron oxide hydrogen reduction system 4 to obtain pure iron powder, and the pure iron powder is recycled to micro iron powder preparation system 1 for micro iron powder preparation.

[0047] The heat from the heat exchange station 301 enters the heating device 302 for heating, and the heat exchange produces cooling water. After treatment, the cooling water is returned to the waste heat boiler 201 for recycling.

[0048] This invention produces 200-500 mesh iron powder by granulation of molten iron using water and nitrogen jets. Under pure oxygen-assisted combustion, it achieves zero carbon dioxide emissions, generating iron(III) oxide solid which can be recycled after hydrogen reduction. This reduces air pollution. Existing industrial parks or residential areas can utilize iron powder combustion for heating, resulting in zero carbon dioxide, sulfur dioxide, and nitrogen dioxide emissions, and no slag output. Furthermore, the burned iron oxide is treated in a hydrogen reduction furnace to generate iron powder for recycling, improving energy efficiency, reducing production costs, and decreasing reliance on traditional energy sources such as coal or natural gas. This achieves green and sustainable development in the preparation and heating processes of metallurgical powders.

[0049] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for recycling combustion products prepared from metallurgical micropowders, characterized in that, include: A micro iron powder preparation system (1), wherein the micro iron powder preparation system (1) includes a micro iron powder preparation device; The iron powder produced by the iron powder preparation device is stored in the iron powder feeding box (101), and the outlet of the iron powder feeding box (101) is connected to the iron powder combustion boiler steam heating system (2). The iron powder combustion boiler steam heating system (2) includes an iron powder combustion device and a waste heat boiler (201); the iron powder combustion device is connected to the iron powder feeding box (101) and is used to burn iron powder to obtain iron oxide powder, which is then transported to the iron oxide hydrogen reduction system (4); the heat generated by the iron powder combustion device enters the park heating system (3), and the generated flue gas enters the waste heat boiler (201). The park heating system (3) includes a heat exchange station (301) and a heating device (302) connected in sequence; the inlet of the heat exchange station (301) is connected to an iron powder combustion device; The iron oxide hydrogen reduction system (4) is used to reduce iron oxide to obtain pure iron powder, and the pure iron powder is returned to the micro iron powder preparation system (1) through the iron powder conveying system (401).

2. The combustion product recycling device for metallurgical micro powder preparation according to claim 1, wherein the micro iron powder preparation device includes a granulation chamber (102); a through hole is provided at the top center of the granulation chamber (102) for molten iron to flow in; a nitrogen nozzle and a water atomizing nozzle are also installed at the top of the granulation chamber (102), and the granulated iron micro powder enters the iron micro powder storage box (103) through the outlet on one side of the bottom of the granulation chamber (102); the iron micro powder storage box (103) is connected to the micro iron powder feeding box (101) through a hopper elevator (104).

3. The combustion product recycling device for metallurgical micro powder preparation according to claim 2, wherein the inner wall of the granulation chamber (102) is provided with a first water-cooled wall, and the first water-cooled wall is connected to a first steam drum (105); the first steam drum (105) is connected to a heat exchange station (301).

4. A combustion product recycling device for metallurgical micro powder preparation according to claim 1, wherein the iron micro powder combustion device includes an iron powder combustion furnace (202); a flue gas outlet is provided on one side of the iron powder combustion furnace (202) and connected to a waste heat boiler (201); an iron powder burner (203) is provided on the other side of the iron powder combustion furnace (202) and the iron powder burner (203) is connected to a micro iron powder feeding box (101); a second water-cooled wall (204) is provided on the inner wall of the iron powder combustion furnace (202); the second water-cooled wall (204) is connected to a second steam drum (205) outside the iron powder combustion furnace (202) and the second steam drum (205) is connected to a heat exchange station (301).

5. The combustion product recycling device for metallurgical powder preparation according to claim 4, wherein a conical iron oxide powder collection area (206) is provided at the bottom of the iron powder combustion furnace (202); and an impeller feeder (207) is installed at the bottom outlet of the iron oxide powder collection area (206).

6. The combustion product recycling device for metallurgical micro powder preparation according to claim 5, wherein an embedded tube heat exchanger (212) is installed in the iron oxide powder collection area (206), and the embedded tube heat exchanger (212) is connected to the second water-cooled wall (204).

7. The combustion product recycling device for metallurgical micro powder preparation according to claim 1, wherein the outlet of the heating device (302) is sequentially connected to a return water station (303), a demineralized water tank (208), and a deaerator (209); the deaerator (209) is connected to a waste heat boiler (201).

8. The combustion product recycling device for metallurgical micro powder preparation according to claim 1, wherein the flue gas outlet of the waste heat boiler (201) is connected to a dust removal system (210); the dust removal system (210) is connected to the bottom of the micro iron powder preparation device through a circulating fan (211) for cooling the micro iron powder prepared.

9. A combustion product recycling device for metallurgical micro powder preparation according to claim 1, wherein the iron oxide hydrogen reduction system (4) comprises an iron oxide reduction belt (402), a reduction furnace slow cooling belt (403), a reduction furnace rapid cooling belt (404), a nitrogen device (410), and an ammonia decomposition device (411); the iron powder in the micro iron powder feeding box (101) passes through the iron oxide reduction belt (402), the reduction furnace slow cooling belt (403), and the reduction furnace rapid cooling belt (404) in sequence via a steel belt (405) to obtain pure iron powder; the steel belt (405) is connected to a passive roller (406) and an active roller (407) respectively, and the active roller (407) is connected to a variable frequency motor (408); the nitrogen device (410) and the ammonia decomposition device (411) provide nitrogen and hydrogen to the iron oxide reduction belt (402) respectively.

10. The combustion product recycling device for metallurgical micro powder preparation according to claim 9, wherein an iron powder thickness adjustment plate (409) is further provided at the inlet of the iron oxide reduction zone (402).

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