Reaction system for dissolving out red mud by utilizing high-iron bauxite

Abstract

The utility model discloses a reaction system for dissolving out red mud by using high-iron bauxite, and aims to solve the problems that the red mud is difficult to settle and separate, the grade of produced iron is lower than the standard of iron ore concentrate raw materials and the like in the traditional high-iron bauxite treatment process. The reaction system comprises dissolution equipment, first filtering equipment, a Bayer process processing unit, red mud upgrading equipment, second filtering equipment and a firing unit, according to the method, high-iron bauxite is treated through dissolution equipment and red mud upgrading equipment, then solid-liquid separation is carried out through first filtering equipment and second filtering equipment, aluminum and iron components in the high-iron bauxite are fully separated twice, and finally, the upgraded high-iron red mud is fired, so that the red-mud-based iron ore concentrate is obtained. Through the arrangement, the utilization rate of iron and aluminum is increased, and meanwhile, the total iron content in the red mud is increased, so that the red mud reaches the iron-containing standard of iron ore concentrate.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of metal smelting, especially relates to a reaction system for dissolving red mud from high-iron bauxite. BACKGROUND

[0002] High-iron bauxite plays an important role in modern alumina industry. The high-iron bauxite generally contains more than 25% of iron oxide, and contains hematite, magnetite, limonite and other iron-containing minerals. The traditional high-iron bauxite processing method is difficult to efficiently extract aluminum and iron resources.

[0003] In the traditional high-iron bauxite processing process, the red mud is usually dispersed and screened out by magnetic separation to obtain iron concentrate; or the red mud is dried and ground to obtain fine particle materials, and then the red mud preformed granular materials are processed into high furnace sintered ore. The above methods have problems such as difficulty in red mud settling and separation, and the iron grade of the output is far lower than the standard of iron concentrate raw materials. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a reaction system for dissolving red mud from high-iron bauxite, which aims to solve the problems of difficulty in red mud settling and separation in the traditional high-iron bauxite processing process, and the problem of low iron grade of the output being lower than the standard of iron concentrate raw materials.

[0005] To solve the above problems, the utility model provides a reaction system for dissolving red mud from high-iron bauxite, which comprises: a dissolution device, a first filtering device, a Bayer process unit, a red mud upgrading device, a second filtering device and a firing unit;

[0006] The dissolution device is provided with a high-iron bauxite inlet and a first mixed ore pulp outlet, the dissolution device performs dissolution reaction on the high-iron bauxite to obtain a first mixed ore pulp;

[0007] The first filtering device is provided with a first mixed ore pulp inlet, a high-iron red mud residue outlet and an aluminum ore filtrate outlet, the first mixed ore pulp outlet is connected with the first mixed ore pulp inlet, and the aluminum ore filtrate outlet is connected with the Bayer process unit;

[0008] The first filtering device receives the first mixed ore pulp through the first mixed ore pulp inlet, and performs solid-liquid separation on the first mixed ore pulp to obtain high-iron red mud residue and aluminum ore filtrate;

[0009] The Bayer process unit receives the aluminum ore filtrate, and generates alumina from the aluminum ore filtrate by the Bayer process;

[0010] The red mud upgrading device is provided with a high-iron red mud residue inlet, an acid liquid inlet and a second mixed ore slurry outlet, the high-iron red mud residue outlet is connected with the high-iron red mud residue inlet, the red mud upgrading device receives the high-iron red mud residue through the high-iron red mud residue inlet, reacts the high-iron red mud residue with the acid liquid received from the acid liquid inlet, and obtains the second mixed ore slurry;

[0011] The second filtering device is provided with a second mixed ore slurry inlet, a high-iron red mud residue upgrading outlet and an aluminum-sodium mineral filtrate outlet, the second mixed ore slurry outlet is connected with the second mixed ore slurry inlet, the second filtering device receives the second mixed ore slurry through the second mixed ore slurry inlet, carries out pressure filtration treatment on the second mixed ore slurry, and obtains the high-iron red mud residue upgrading and the aluminum-sodium mineral filtrate;

[0012] The high-iron red mud residue upgrading outlet is connected with the firing unit, the firing unit receives the high-iron red mud residue upgrading, carries out firing treatment on the high-iron red mud residue upgrading, and obtains the red mud-based iron concentrate.

[0013] Preferably, the aluminum-sodium mineral filtrate outlet is connected with the Bayer process unit, the Bayer process unit also receives the aluminum-sodium mineral filtrate, and generates aluminum oxide from the aluminum-sodium mineral filtrate through the Bayer process.

[0014] Preferably, the firing unit comprises a pelletizing device and a roasting device, the pelletizing device is provided with a high-iron red mud residue upgrading inlet, a sintering mixture inlet and a red mud-based pellet outlet, the roasting device is provided with a red mud-based pellet inlet and a red mud-based iron concentrate outlet, the high-iron red mud residue upgrading outlet is connected with the high-iron red mud residue upgrading inlet, the sintering mixture inlet is used for the sintering mixture to enter the pelletizing device, the pelletizing device processes the high-iron red mud residue upgrading and the sintering mixture into the red mud-based pellet, the red mud-based pellet outlet is connected with the red mud-based pellet inlet, and the roasting device carries out roasting treatment on the red mud-based pellet to obtain the red mud-based iron concentrate and discharge the red mud-based iron concentrate along the red mud-based iron concentrate outlet.

[0015] Preferably, the sintering mixture comprises coke, lime and iron concentrate.

[0016] Preferably, the reaction system further comprises a drying device, the high-iron red mud residue upgrading outlet is connected with the inlet of the drying device, the outlet of the drying device is connected with the high-iron red mud residue upgrading inlet, and the drying device carries out drying treatment on the high-iron red mud residue upgrading.

[0017] Preferably, the reaction system further comprises a weighing device, the weighing device is used for weighing the starting weight of the high-iron bauxite, and the outlet of the weighing device is connected with the high-iron bauxite inlet.

[0018] Preferably, the leaching device is further provided with a steam inlet and an alkali inlet, the steam inlet is used for steam to enter the leaching device, and the alkali inlet is used for alkali to enter the leaching device.

[0019] Preferably, the reaction system further comprises a neutralization device, the bauxite sodium mineral filtrate outlet is connected with an inlet of the neutralization device, an outlet of the neutralization device is connected with the bayer process unit, and the neutralization device is used for neutralizing acid liquid in the bauxite sodium mineral filtrate.

[0020] Preferably, the reaction system further comprises a collection device, and the red mud-based iron concentrate outlet is connected with an inlet of the collection device.

[0021] Preferably, the first filtering device is in a sealed state during solid-liquid separation, and the first filtering device is connected with a first pressurizing device.

[0022] Preferably, the second filtering device is in a sealed state during solid-liquid separation, and the second filtering device is connected with a second pressurizing device.

[0023] The reaction system for leaching red mud from high-iron bauxite ore is provided, the leaching device and the red mud upgrading device are used for processing, and then the first filtering device and the second filtering device are used for solid-liquid separation, so that the aluminum and iron components in the high-iron bauxite ore are fully separated twice, and the utilization rate of iron and aluminum is improved; further, after the high-iron bauxite ore enters the leaching device, the obtained first mixed ore slurry directly enters the first filtering device, so that the redundant process of dilution and precipitation in the traditional process is omitted, and the work efficiency is improved; through the red mud upgrading device, the different dissolution speeds of the iron-containing minerals and the bauxite sodium minerals in the red mud in the acid leaching process are utilized, the competitive dissolution of the bauxite sodium and other impurity minerals is realized, the total iron content in the red mud can be further improved, and the iron content standard of the iron concentrate can be reached; the upgraded red mud can be directly used as one of the raw materials of sintering mixture, tailings are not discharged, and the full utilization of the red mud is realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a reaction system for leaching red mud from high-iron bauxite ore according to an embodiment of the utility model;

[0025] Figure 2 is an inlet and outlet schematic view of each device in the reaction system for leaching red mud from high-iron bauxite ore according to an embodiment of the utility model.

[0026] REFERENCE SIGNS:

[0027] 1, weighing device;

[0028] 2. Dissolution apparatus; 2a. High-iron bauxite inlet; 2b. First mixed slurry outlet; 2c. Steam inlet; 2d. Alkaline liquor inlet;

[0029] 3. First filtration apparatus; 3a. First mixed slurry inlet; 3b. High-iron red mud filter cake outlet; 3c. Alumina liquor outlet;

[0030] 4. Bayer process unit;

[0031] 5. Red mud upgrading apparatus; 5a. High-iron red mud filter cake inlet; 5b. Acid liquor inlet; 5c. Second mixed slurry outlet;

[0032] 6. Second filtration apparatus; 6a. Second mixed slurry inlet; 6b. Upgraded high-iron red mud filter cake outlet; 6c. Alumina-sodium mineral liquor outlet;

[0033] 7. Drying apparatus;

[0034] 8. Pelletising apparatus; 8a. Upgraded high-iron red mud filter cake inlet; 8b. Sintered mix inlet; 8c. Red mud-based pellet outlet;

[0035] 9. Roasting apparatus; 9a. Red mud-based pellet inlet; 9b. Red mud-based iron concentrate outlet;

[0036] 10. Collection apparatus;

[0037] 11. Neutralisation apparatus. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the present application clearer, further detailed descriptions will be given below with reference to the embodiments and in conjunction with the drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following descriptions, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present application.

[0039] In conjunction with Figure 1 and Figure 2The utility model provides a kind of reaction system of utilizing high iron bauxite leaching red mud, comprising: leaching equipment 2, first filter equipment 3, bayer method processing unit 4, red mud upgrading equipment 5, second filter equipment 6 and firing unit;Leaching equipment 2 is provided with high iron bauxite entrance 2a and first mixed ore pulp outlet 2b, and leaching equipment 2 carries out leaching reaction to high iron bauxite, obtains first mixed ore pulp;First filter equipment 3 is provided with first mixed ore pulp entrance 3a, high iron red mud filter residue outlet 3b and aluminium ore filtrate outlet 3c, and first mixed ore pulp outlet 2b is connected with first mixed ore pulp entrance 3a, and aluminium ore filtrate outlet 3c is connected with bayer method processing unit 4;First filter equipment 3 receives first mixed ore pulp by first mixed ore pulp entrance 3a, and carries out solid-liquid separation to first mixed ore pulp, obtains high iron red mud filter residue and aluminium ore filtrate;Bayer method processing unit 4 receives aluminium ore filtrate, and aluminium ore filtrate is generated alumina by bayer method;Red mud upgrading equipment 5 is provided with high iron red mud filter residue entrance 5a, acid liquid entrance 5b and second mixed ore pulp outlet 5c, and high iron red mud filter residue outlet 3b is connected with high iron red mud filter residue entrance 5a, and red mud upgrading equipment 5 receives high iron red mud filter residue by high iron red mud filter residue entrance 5a, and high iron red mud filter residue is reacted with the acid liquid received from acid liquid entrance 5b, to obtain second mixed ore pulp;Second filter equipment 6 is provided with second mixed ore pulp entrance 6a, upgrading high iron red mud filter residue outlet 6b and aluminium sodium mineral filtrate outlet 6c, and second mixed ore pulp outlet 5c is connected with second mixed ore pulp entrance 6a, and second filter equipment 6 receives second mixed ore pulp by second mixed ore pulp entrance 6a, and carries out pressure filtration treatment to second mixed ore pulp, to obtain upgrading high iron red mud filter residue and aluminium sodium mineral filtrate;Upgrading high iron red mud filter residue outlet 6b is connected with firing unit, and firing unit receives upgrading high iron red mud filter residue, and carries out firing treatment to upgrading high iron red mud filter residue, to obtain red mud-based iron concentrate.Through leaching equipment 2 and red mud upgrading equipment 5 processing, then respectively through first filter equipment 3 and second filter equipment 6 solid-liquid separation, aluminium and iron components in high iron bauxite are fully separated twice, iron and aluminium can be obtained after reaction system processing, improve the separation efficiency of iron and aluminium, and the utilization rate of iron and aluminium can also be improved;Further, after high iron bauxite enters leaching equipment 2, the first mixed ore pulp obtained directly enters first filter equipment 3, and the tedious process of dilution and precipitation still needs in traditional process is saved, so that the work efficiency is improved;Through red mud upgrading equipment 5, the leaching speed of iron-containing minerals and aluminium sodium minerals in red mud is different in acid leaching process, so that the speeded-up leaching of aluminium sodium and other impurity minerals is realized, and the total iron content in red mud can be further improved to reach the iron content standard of iron concentrate.

[0040] It should be noted that the specific model and structure of each device in the reaction system are not limited here, and the related processing operations of the high-iron bauxite can be met. The specific position and structure of the inlet and outlet of each device are not limited, and the related conversion operations of the high-iron bauxite can be met, and the processed product can be transported to the next device or the final product. In the reaction system provided by the utility model, the high-iron red mud residue preliminarily screened is reacted with acid liquid by setting the red mud upgrading device 5, and the dissolution speed difference of different mineral phases is utilized, that is, the dissolution rate of aluminum sodium minerals is greater than that of iron minerals. After the high-iron red mud residue and the acid liquid are mixed, the residual aluminum sodium minerals in the high-iron red mud residue preferentially react with the acid liquid, further reducing the content of aluminum and sodium in the high-iron red mud residue, and then increasing the total iron content in the red mud, so that the iron content reaches the standard of iron concentrate. The type of acid liquid is not limited here, and in the optional case, the acid liquid is inorganic acid, such as hydrochloric acid, nitric acid, sulfuric acid, etc., and in another optional case, the acid liquid is organic acid, such as oxalic acid, acetic acid, etc. The reaction time in the red mud upgrading device 5 is not limited here, and is determined according to the weight of the high-iron red mud residue and the concentration of the acid liquid, etc. In an embodiment of the utility model, the concentration of the acid liquid is 0.01-10 mol / L, and the reaction time in the red mud upgrading device 5 can be 5-60 min. The order of the high-iron red mud residue and the acid liquid entering the red mud upgrading device 5 is not limited, and the specific position of the high-iron red mud residue inlet 5a and the acid liquid inlet 5b is not limited.

[0041] In the preferred case, the leaching device 2 is also provided with a steam inlet 2c and an alkali inlet 2d, the steam inlet 2c is used for the steam to enter the leaching device 2, and the alkali inlet 2d is used for the alkali to enter the leaching device 2. Through such a setting, high-temperature steam and alkali are introduced into the leaching device 2 to carry out leaching reaction on the high-iron bauxite, and form the first mixed ore pulp. In the process of forming the first mixed ore pulp by reacting in the leaching device 2, high-temperature steam and high-concentration alkali are introduced into the leaching device, and temperature control, pressure control and time control leaching reaction are carried out at the same time. The flow rate of the steam and the concentration of the alkali are not limited here, and in an embodiment of the utility model, the reaction temperature in the leaching device 2 is controlled at 230-280℃, the reaction pressure is 1-6 MPa, the reaction time is optionally 10-120 min, the alkali concentration is 20-200 g / L, and the solid-liquid ratio of the high-iron bauxite and the alkali is 100-400 g / L. The order of the high-iron bauxite, the steam and the alkali entering the leaching device 2 is not limited here, and the three can be reacted in the leaching device 2 to generate the first mixed ore pulp. Through such a setting, in the leaching process, temperature control, pressure control and time control are realized, which realizes the dissolution of aluminum at the same time, and also realizes the transformation of iron-containing mineral phases such as hematite, goethite and siderite in the high-iron bauxite, which is beneficial to the subsequent upgrading treatment of the iron-containing red mud.

[0042] In the preferred case, the sodium aluminate mineral filtrate outlet 6c is connected with the bayer process unit 4, and the bayer process unit 4 also receives the sodium aluminate mineral filtrate to generate alumina by bayer process. It should be noted that the specific process and related equipment of the bayer process unit 4 are not limited here, as long as the bayer process unit 4 can generate alumina by bayer process with the aluminum mineral filtrate and the sodium aluminate mineral filtrate. Through such a setting, the recovered treatment of the obtained sodium aluminate mineral filtrate after secondary filtration is carried out, the recovery rate of aluminum is further improved, and the discharge of the filtrate after secondary filtration is avoided, thereby reducing environmental pollution and saving costs.

[0043] In the preferred case, the firing unit includes a pelletizing device 8 and a roasting device 9, the pelletizing device 8 is provided with a high-quality high-iron red mud filter residue inlet 8a, a sintering mixture inlet 8b, and a red mud-based pellet outlet 8c, the roasting device 9 is provided with a red mud-based pellet inlet 9a and a red mud-based iron concentrate outlet 9b, the high-quality high-iron red mud filter residue outlet 6b is connected with the high-quality high-iron red mud filter residue inlet 8a, the sintering mixture inlet 8b is used for the sintering mixture to enter the pelletizing device 8, the pelletizing device 8 processes the high-quality high-iron red mud filter residue and the sintering mixture into red mud-based pellets, the red mud-based pellet outlet 8c is connected with the red mud-based pellet inlet 9a, and the roasting device 9 roasts the red mud-based pellets to obtain red mud-based iron concentrate and discharges the red mud-based iron concentrate along the red mud-based iron concentrate outlet 9b. Further, the sintering mixture includes coke, lime, and iron concentrate. Here, the specific proportion range of coke, lime, and iron concentrate is not limited, and is adjusted according to the specific chemical composition in the high-quality high-iron red mud residue. An embodiment of the present application provides that the proportion of coke, lime, iron concentrate, and high-quality high-iron red mud in the overall weight is: coke accounts for 1-10%, lime accounts for 1-10%, iron concentrate accounts for 40-60%, and high-quality high-iron red mud accounts for 10-40%. After the high-quality high-iron red mud enters the pelletizing device 8, the high-quality high-iron red mud is mixed with coke, lime, and iron concentrate in proportion, and the pelletizing device 8 processes the mixed high-quality high-iron red mud and sintering mixture into red mud-based pellets. Here, the processing mode of the pelletizing device 8 is not limited, which can be that a stirring device and a pelletizing tool are arranged in the pelletizing device 8, the high-quality high-iron red mud and the sintering mixture are fully mixed after entering the stirring device, and then pass through the pelletizing tool to process the red mud-based pellets, or artificial stirring, processing, and the like are adopted. The red mud after upgrading can be directly used as one of the raw materials of the sintering mixture, tailing discharge is avoided, and full utilization of the red mud is realized. In the roasting device 9, the red mud-based pellets are converted into red mud-based iron concentrate after high-temperature roasting. Here, the operation time of the roasting device 9 is not limited, and is determined according to the weight of the red mud-based pellets for single firing. In an embodiment of the present application, the firing temperature of the roasting device 9 is 1200-1350°C.

[0044] In the preferred case, the reaction system further comprises a drying device 7, the outlet of the upgraded high-iron red mud filter residue 6b is connected with the inlet of the drying device 7, the outlet of the drying device 7 is connected with the inlet of the upgraded high-iron red mud filter residue 8a, and the drying device 7 is used for drying the upgraded high-iron red mud filter residue. The upgraded high-iron red mud filter residue after drying treatment and the sintered mixture are processed into red mud-based pellets, which reduces the moisture in the red mud-based pellets and is beneficial to improve the roasting effect of the roasting device 9. The structure and drying method of the drying device 7 are not limited here, and the drying device 7 can be an oven or a dryer.

[0045] In the preferred case, the reaction system further comprises a weighing device 1, which is used for weighing the starting weight of the high-iron bauxite, and the outlet of the weighing device 1 is connected with the inlet of the high-iron bauxite 2a. Through such a setting, the weight of the high-iron bauxite entering the reaction system at a time is obtained, and the operating conditions of the subsequent devices and the weight of other materials such as acid solution and sintered mixture that need to be added are determined according to the weight of the high-iron bauxite, so that the operation of the reaction system is smoother, and the utilization rate of iron and aluminum is further improved. Further, the reaction system further comprises a collection device 10, and the outlet of the red mud-based iron concentrate 9b is connected with the inlet of the collection device 10. The collection device 10 is used for collecting the output red mud-based iron concentrate.

[0046] In the preferred case, the reaction system further comprises a neutralization device 11, the outlet of the aluminum-sodium mineral filtrate 6c is connected with the inlet of the neutralization device 11, the outlet of the neutralization device 11 is connected with the inlet of the Bayer process unit 4, and the neutralization device 11 is used for neutralizing the acid solution in the aluminum-sodium mineral filtrate. Here, the specific neutralization method of the aluminum-sodium mineral filtrate in the neutralization device 11 is not limited, as long as the acid solution in the aluminum-sodium mineral filtrate can be neutralized to meet the requirements of entering the Bayer process unit 4.

[0047] In a preferred embodiment, the first filter device 3 is in a sealed state during solid-liquid separation, and the first filter device 3 is connected to a first boosting device. Furthermore, the second filter device 6 is in a sealed state during solid-liquid separation, and the second filter device 6 is connected to a second boosting device. The first boosting device is used to increase the pressure in the first filter device 3. The first filter device 3 is connected after the dissolution device 2. After high-pressure filtration and separation, some problems such as poor flocculation effect of high-iron red mud, long sedimentation and separation time, and low filtration efficiency are solved, thereby improving the filtration efficiency of the first mixed slurry. The second boosting device is used to increase the pressure in the second filter device 6 and improve the filtration efficiency of the second mixed slurry. The connection relationship between the first boosting device and the first filter device 3, and the second boosting device and the second filter device 6 is not limited here. The first boosting device and the second boosting device can be fixedly arranged on the first filter device 3 and the second filter device 6 respectively, or one boosting device can boost the pressure of the first filter device 3 and the second filter device 6 at the same time. In one embodiment of the present invention, the pressure in the first filter device 3 is 1-6 MPa, and the pressure in the second filter device 6 is 1-6 MPa. It should be noted that the pressure in the first filter device 3 and the second filter device 6 is adjusted according to the filtering requirements, and the pressures in the two devices may be different.

[0048] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A reaction system for dissolving red mud using high-iron bauxite, characterized in that: include: A dissolution device (2), a first filtering device (3), a Bayer process unit (4), a red mud upgrading device (5), a second filtering device (6) and a firing unit; The dissolution equipment (2) is provided with a high-iron bauxite inlet (2a) and a first mixed slurry outlet (2b), and the dissolution equipment (2) performs a dissolution reaction on the high-iron bauxite to obtain a first mixed slurry; The first filtering device (3) is provided with a first mixed slurry inlet (3a), a high iron red mud residue outlet (3b) and an aluminum ore filtrate outlet (3c), the first mixed slurry outlet (2b) is connected to the first mixed slurry inlet (3a), and the aluminum ore filtrate outlet (3c) is connected to the Bayer process processing unit (4); The first filtering device (3) receives the first mixed slurry through a first mixed slurry inlet (3a), and performs solid-liquid separation on the first mixed slurry to obtain high-iron red mud residue and aluminum ore filtrate; The Bayer process processing unit (4) receives the aluminum ore filtrate and generates aluminum oxide through the Bayer process. The red mud upgrading equipment (5) is provided with a high-iron red mud filter residue inlet (5a), an acid solution inlet (5b) and a second mixed slurry outlet (5c); the high-iron red mud filter residue outlet (3b) is connected to the high-iron red mud filter residue inlet (5a); the red mud upgrading equipment (5) receives the high-iron red mud filter residue through the high-iron red mud filter residue inlet (5a), reacts the high-iron red mud filter residue with the acid solution received from the acid solution inlet (5b), and obtains a second mixed slurry; The second filtering device (6) is provided with a second mixed slurry inlet (6a), an upgraded high-iron red mud filter residue outlet (6b) and a sodium aluminum mineral filtrate outlet (6c); the second mixed slurry outlet (5c) is connected to the second mixed slurry inlet (6a); the second filtering device (6) receives the second mixed slurry through the second mixed slurry inlet (6a), performs filter pressing treatment on the second mixed slurry, and obtains the upgraded high-iron red mud filter residue and the sodium aluminum mineral filtrate; The upgraded high-iron red mud filter residue outlet (6b) is connected to the firing unit, and the firing unit receives the upgraded high-iron red mud filter residue and fires the upgraded high-iron red mud filter residue to obtain red mud-based iron concentrate.

2. The reaction system according to claim 1, characterized in that The sodium aluminum mineral filtrate outlet (6c) is connected to the Bayer process processing unit (4), and the Bayer process processing unit (4) also receives the sodium aluminum mineral filtrate and generates aluminum oxide from the sodium aluminum mineral filtrate through the Bayer process.

3. The reaction system according to claim 2, characterized in that The firing unit includes a pelletizing device (8) and a roasting device (9). The pelletizing device (8) is provided with an upgraded high-iron red mud filter residue inlet (8a), a sintered mixture inlet (8b) and a red mud-based pellet outlet (8c). The roasting device (9) is provided with a red mud-based pellet inlet (9a) and a red mud-based iron concentrate outlet (9b). The upgraded high-iron red mud filter residue outlet (6b) is connected to the upgraded high-iron red mud filter residue inlet (8a). The sintered mixture inlet (8b) is used for the sintered mixture to enter the pelletizing device (8). The pelletizing device (8) processes the upgraded high-iron red mud filter residue and the sintered mixture into red mud-based pellets. The red mud-based pellet outlet (8c) is connected to the red mud-based pellet inlet (9a). The roasting device (9) roasts the red mud-based pellets to obtain red mud-based iron concentrate and discharges the concentrate along the red mud-based iron concentrate outlet (9b).

4. The reaction system according to claim 3, characterized in that The reaction system further comprises a drying device (7), the outlet (6b) of the upgraded high-iron red mud filter residue is connected to the inlet of the drying device (7), the outlet of the drying device (7) is connected to the inlet (8a) of the upgraded high-iron red mud filter residue, and the drying device (7) dries the upgraded high-iron red mud filter residue.

5. The reaction system according to claim 1, characterized in that The reaction system further comprises a weighing device (1), wherein the weighing device (1) is used to weigh the initial weight of the high-iron bauxite, and the outlet of the weighing device (1) is connected to the high-iron bauxite inlet (2a).

6. The reaction system according to claim 5, characterized in that The dissolution equipment is further provided with a steam inlet (2c) and an alkali solution inlet (2d), wherein the steam inlet (2c) is used for steam to enter the dissolution equipment, and the alkali solution inlet (2d) is used for alkali solution to enter the dissolution equipment.

7. The reaction system according to claim 1, characterized in that The reaction system further comprises a neutralization device (11), the sodium aluminum mineral filtrate outlet (6c) is connected to the inlet of the neutralization device (11), the outlet of the neutralization device (11) is connected to the Bayer process unit (4), and the neutralization device (11) is used to neutralize the acid in the sodium aluminum mineral filtrate.

8. The reaction system according to claim 1, characterized in that The reaction system further comprises a collecting device (10), and the red mud-based iron concentrate outlet (9b) is connected to the inlet of the collecting device (10).

9. The reaction system according to any one of claims 1 to 8, characterized in that The first filtering device (3) is in a sealed state during solid-liquid separation, and the first filtering device (3) is connected to a first pressurizing device.

10. The reaction system according to any one of claims 1 to 8, characterized in that The second filtering device (6) is in a sealed state during solid-liquid separation, and the second filtering device (6) is connected to a second pressurizing device.

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