A deep reduction device for preparing ceramsite by using red mud tailings after iron extraction

Abstract

The utility model discloses a kind of deep reduction device for preparing ceramsite by red mud tailings after extracting iron, including high-temperature reduction furnace and regenerative burner, the upper surface of the high-temperature reduction furnace is equipped with red mud feed hopper, the upper surface of the high-temperature reduction furnace is equipped with multiple reduction calcining chamber connected with the red mud feed hopper, the inside of the high-temperature reduction furnace is equipped with multiple heating chamber matched with the reduction calcining chamber, the deep reduction device for preparing ceramsite by red mud tailings after extracting iron is convenient to speed up the heat transfer and temperature rise of reduction calcining chamber by setting heat conducting plate and heating chamber, improve production efficiency, by setting reduction gas branch pipe, reduction gas inlet pipe, control valve and reduction gas connecting pipeline, it is convenient to inject reduction gas into each reduction calcining chamber, by setting, by setting temperature sensor, it is convenient to monitor the temperature in reduction calcining chamber, ensure that the deep reduction reaction of red mud can be smoothly carried out.

Description

Technical Field

[0001] This utility model relates to the field of mineral processing technology, specifically a deep reduction device for preparing ceramsite from tailings after iron extraction from red mud. Background Technology

[0002] In the metallurgical industry, the treatment of red mud has always been of paramount importance. As an industrial waste generated during the alumina refining process from bauxite, red mud is not only produced in huge quantities but also contains various valuable metals. Improper treatment can not only occupy a large amount of land resources but also cause serious pollution to soil, water, and air. Extracting iron from red mud can achieve resource recycling and effectively reduce environmental pollution. Deep reduction of red mud is a key technology to achieve this goal. It is a process that uses high-temperature reduction roasting to gradually convert iron oxides (such as hematite) in red mud into metallic iron. Its core lies in achieving efficient recovery and resource utilization of iron by precisely controlling the raw material ratio, temperature, atmosphere, and reaction time. The tailings after iron extraction from red mud also have high utilization value and can be used to prepare ceramsite, thereby maximizing resource utilization. In this process, the deep reduction device plays an important role. This device extracts iron from red mud at high temperatures, and after the iron is separated from the tailings, the tailings can be used to make ceramsite. However, existing deep red mud reduction devices have significant shortcomings, including low thermal utilization efficiency and difficulty in achieving precise temperature control, which to some extent restricts the efficient utilization of red mud resources. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a deep reduction device for preparing ceramsite using tailings from red mud iron extraction. This device facilitates faster heating of the reduction calcination chamber, has high heat utilization efficiency, and is easy to monitor the temperature of the reduction calcination chamber, thus effectively solving the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A deep reduction device for preparing ceramsite from tailings after iron extraction from red mud includes a high-temperature reduction furnace and a regenerative burner. The upper surface of the high-temperature reduction furnace is provided with a red mud feed hopper. Multiple reduction and calcination chambers connected to the red mud feed hopper are formed on the upper surface of the high-temperature reduction furnace. Multiple heating chambers cooperating with the reduction and calcination chambers are formed inside the high-temperature reduction furnace. Temperature sensors cooperating with the heating chambers are provided on the outer surface of the high-temperature reduction furnace. A high-temperature flue gas distribution pipe is connected to the side of each heating chamber. The end of the high-temperature flue gas distribution pipe is connected to a high-temperature flue gas main pipe cooperating with the regenerative burner. A reducing gas injection component is installed on the side of the high-temperature reduction furnace. A material discharge pipe is connected to the bottom of the reduction and calcination chambers, and a material control valve is installed on the material discharge pipe.

[0006] As a preferred technical solution of this utility model, a reduction calcination chamber is provided between every two heating chambers, and both sides of the reduction calcination chamber are heated simultaneously to improve the heating rate of the reduction calcination chamber.

[0007] As a preferred technical solution of this utility model, a heat-conducting plate is provided between the heating chamber and the reduction calcination chamber. Specifically, the heat-conducting plate is a high-temperature resistant heat-conducting plate, which facilitates rapid heat conduction between the heating chamber and the reduction calcination chamber. The heating chambers on both sides facilitate rapid heating of the reduction calcination chamber, so that the red mud can reach the temperature required for the reduction reaction more quickly.

[0008] As a preferred technical solution of this utility model, the outer surface of the high-temperature reduction furnace is provided with a reduction tail gas discharge pipe. Each heating chamber is connected to the reduction tail gas discharge pipe through a gas pipe, which facilitates the discharge of high-temperature reduction tail gas from different reduction calcination chambers. The high-temperature reduction tail gas can be centrally discharged and used for heating in other production processes, thus saving energy.

[0009] As a preferred embodiment of this invention, the reducing gas injection component includes a reducing gas distribution pipe disposed on the outer surface of the high-temperature reduction furnace. Multiple reducing gas connection pipes are provided on the side of the high-temperature reduction furnace. One end of each reducing gas connection pipe is connected to the reducing gas distribution pipe, and the other end is connected to the reduction calcination chamber. A reducing gas inlet pipe is connected to the circumference of the reducing gas distribution pipe, which facilitates the injection of reducing gas into different reduction calcination chambers and promotes the deep reduction reaction of red mud.

[0010] As a preferred technical solution of this utility model, multiple control valves are installed on the reducing gas branch pipe, and the entry of reducing gas into different reducing gas chambers is controlled by the multiple control valves.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This deep reduction device for preparing ceramsite from tailings after iron extraction from red mud is designed with heat-conducting plates and heating chambers to accelerate heat transfer and temperature rise in the reduction calcination chamber, thereby improving production efficiency. The device also features reducing gas distribution pipes, reducing gas inlet pipes, control valves, and reducing gas connection pipelines to facilitate the injection of reducing gas into each reduction calcination chamber. Furthermore, temperature sensors are installed to monitor the temperature within the reduction calcination chambers, ensuring the smooth progress of the deep reduction reaction of the red mud. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2This is a schematic diagram of the structure from another direction of the present invention.

[0015] Figure 3 This is a partial cross-sectional structural diagram of the present invention.

[0016] Figure 4 This is a partial cross-sectional structural diagram of the present invention from another direction.

[0017] In the diagram: 1. High-temperature reduction furnace; 2. Regenerative burner; 3. Temperature sensor; 4. Reduction calcination chamber; 5. Red mud feed hopper; 6. Reduction gas branch pipe; 7. Reduction gas inlet pipe; 8. Control valve; 9. Reduction gas connection pipe; 10. Material control valve; 11. Material discharge pipe; 12. Reduction tail gas discharge pipe; 13. Heat-conducting plate; 14. Heating chamber; 15. High-temperature flue gas branch pipe; 16. High-temperature flue gas main pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 This utility model provides a technical solution:

[0020] A deep reduction device for preparing ceramsite using tailings from iron extraction from red mud includes a high-temperature reduction furnace 1 and a regenerative burner 2. The upper surface of the high-temperature reduction furnace 1 is provided with a red mud feed hopper 5, and multiple reduction calcination chambers 4 connected to the red mud feed hoppers 5 are opened on the upper surface of the high-temperature reduction furnace 1. Multiple heating chambers 14 that cooperate with the reduction calcination chambers 4 are opened inside the high-temperature reduction furnace 1. Temperature sensors 3 that cooperate with the heating chambers 14 are provided on the outer surface of the high-temperature reduction furnace 1. The temperature sensors 3 can be thermocouple sensors or infrared temperature sensors. A high-temperature flue gas distribution pipe 15 is connected to the side of the heating chamber 14, and a high-temperature flue gas main pipe 16 that cooperates with the regenerative burner 2 is connected to the end of the high-temperature flue gas distribution pipe 15. A reducing gas injection component is installed on the side of the high-temperature reduction furnace 1, and a material discharge pipe 11 is connected to the bottom of the reduction calcination chambers 4. A material control valve 10 is installed on the material discharge pipe 11.

[0021] A reduction calcination chamber 4 is provided between every two heating chambers 14.

[0022] The reduction calcination chamber 4 has a long strip structure. The heating chambers 14 on both sides can accelerate the heating of the reduction calcination chamber 4, so that the red mud can reach the temperature required for the reduction reaction more quickly and evenly.

[0023] A heat-conducting plate 13 is provided between the heating chamber 14 and the reduction calcination chamber 4. The high-temperature resistant heat-conducting plate 13 can be a zirconia ceramic plate.

[0024] The outer surface of the high-temperature reduction furnace 1 is provided with a reduction tail gas discharge pipe 12, and each heating chamber 14 is connected to the reduction tail gas discharge pipe 12 through a gas pipe.

[0025] The reducing gas addition assembly includes a reducing gas branch pipe 6 located on the outer surface of the high-temperature reduction furnace 1. Multiple reducing gas connection pipes 9 are provided on the side of the high-temperature reduction furnace 1. One end of the reducing gas connection pipe 9 is connected to the reducing gas branch pipe 6, and the other end of the reducing gas connection pipe 9 is connected to the reduction calcination chamber 4. A reducing gas inlet pipe 7 is connected to the circumference of the reducing gas branch pipe 6.

[0026] Multiple control valves 8 are installed on the reducing gas branch pipe 6.

[0027] Red mud pellets are fed into different reduction and calcination chambers 4 in the high-temperature reduction furnace 1 using the red mud feed hopper 5. The reduction and calcination chambers 4 are heated simultaneously by multiple heating chambers 14 through the regenerative burner 2, the high-temperature flue gas main pipe 16, and multiple high-temperature flue gas branch pipes 15, ensuring uniform and efficient heating of the red mud pellets. The temperature of the reduction and calcination chambers 4 is monitored by the temperature sensor 3, allowing the red mud pellets to reach the temperature required for the reduction reaction more quickly. Reducing gas is injected into different reduction and calcination chambers 4 through the reducing gas inlet pipe 7, the reducing gas branch pipe 6, the control valve 8, and the reducing gas connecting pipe 9. After the reduction reaction, the red mud pellets move from top to bottom under the action of gravity and are discharged along the material discharge pipe 11. After the red mud pellets are discharged, impurities are removed by magnetic separation, and then elemental iron and molten slag are separated at high temperature. The molten slag can be separated to make ceramsite.

[0028] Both the regenerative burner 2 and the temperature sensor 3 are common models available on the market. Both the regenerative burner 2 and the temperature sensor 3 are electrically connected to the external control switch group, and their electrical connection is a common method in the prior art.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A deep reduction device for preparing ceramsite from tailings after iron extraction from red mud, comprising a high-temperature reduction furnace (1) and a regenerative burner (2), characterized in that: The upper surface of the high-temperature reduction furnace (1) is provided with a red mud feed hopper (5). The upper surface of the high-temperature reduction furnace (1) is provided with a plurality of reduction calcination chambers (4) connected to the red mud feed hopper (5). The interior of the high-temperature reduction furnace (1) is provided with a plurality of heating chambers (14) that cooperate with the reduction calcination chambers (4). The outer surface of the high-temperature reduction furnace (1) is provided with a temperature sensor (3) that cooperates with the heating chambers (14). The side of the heating chambers (14) is connected to a high-temperature flue gas branch pipe (15). The end of the high-temperature flue gas branch pipe (15) is connected to a high-temperature flue gas main pipe (16) that cooperates with the regenerative burner (2). The side of the high-temperature reduction furnace (1) is equipped with a reducing gas injection component. The bottom of the reduction calcination chamber (4) is connected to a material discharge pipe (11). A material control valve (10) is installed on the material discharge pipe (11).

2. The deep reduction device for preparing ceramsite from tailings after iron extraction from red mud according to claim 1, characterized in that: A reduction calcination chamber (4) is provided between every two heating chambers (14).

3. The deep reduction device for preparing ceramsite from tailings after iron extraction from red mud according to claim 1, characterized in that: A heat-conducting plate (13) is provided between the heating chamber (14) and the reduction calcination chamber (4).

4. The deep reduction device for preparing ceramsite from tailings after iron extraction from red mud according to claim 1, characterized in that: The outer surface of the high-temperature reduction furnace (1) is provided with a reduction tail gas discharge pipe (12), and each of the heating chambers (14) is connected to the reduction tail gas discharge pipe (12) through a gas pipe.

5. The deep reduction device for preparing ceramsite from tailings after iron extraction from red mud according to claim 1, characterized in that: The reducing gas addition assembly includes a reducing gas branch pipe (6) disposed on the outer surface of the high-temperature reduction furnace (1). Multiple reducing gas connection pipes (9) are provided on the side of the high-temperature reduction furnace (1). One end of the reducing gas connection pipe (9) is connected to the reducing gas branch pipe (6), and the other end of the reducing gas connection pipe (9) is connected to the reduction calcination chamber (4). A reducing gas inlet pipe (7) is connected to the circumference of the reducing gas branch pipe (6).

6. The deep reduction apparatus for preparing ceramsite from tailings after iron extraction from red mud according to claim 5, characterized in that: Multiple control valves (8) are installed on the reducing gas branch pipe (6).

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