Sorting system for refractory ferromanganese ore

Abstract

The invention provides a refractory ferromanganese ore separation system, and belongs to the technical field of refractory ferromanganese ore separation systems. The invention discloses a refractory ferromanganese ore separation system which comprises a feeding system, a preheating oxidation system, a fluidization synchronous reduction roasting system, a fluidization cooling oxidation system, an ore grinding magnetic separation system and a hot air circulation dust removal system. According to the system, a fluidized roasting technology is adopted to enable reducing gas and a solid material to be in close contact to generate a gas-solid efficient reaction, the material is heated through the preheating oxidation system, the material is heated uniformly, the next reduction reaction is facilitated, and the iron-containing manganese ore phase is accurately converted and generated in the fluidized reduction reaction system and the fluidized cooling oxidation system, so that the iron-containing manganese ore is obtained. And after the reduction reaction is finished, the mineral dissociation degree is increased through ore grinding, and iron and manganese resources are subjected to efficient magnetic separation through a magnetic separation system. The system is environment-friendly, relatively compact in process, relatively high in treatment capacity, relatively high in automation degree and capable of more accurately controlling conversion of an iron phase and a manganese phase.

Description

Technical Field

[0001] The invention belongs to the technical field of refractory iron-manganese ore beneficiation systems, and in particular relates to a refractory iron-manganese ore beneficiation system. Background Art

[0002] Manganese is an indispensable additive in steel production. It can effectively improve the strength, toughness and wear resistance of steel, and is crucial to improving the quality of steel products. However, in the field of refractory ferromanganese ore beneficiation, there have long been many severe challenges. Refractory ferromanganese ore has the characteristics of fine particle size of ferromanganese minerals, complex composition, and close symbiotic relationship, which makes it difficult for traditional beneficiation methods such as gravity separation, flotation, and magnetic separation to achieve ideal separation effects. Gravity separation is difficult to effectively separate fine-grained ferromanganese minerals, and the selectivity of flotation agents is poor. Magnetic separation is limited by the lack of obvious magnetic differences between ferromanganese minerals. These problems result in low recovery rates of existing technologies and difficulty in ensuring the grade of concentrates, which seriously restricts the efficient utilization of ferromanganese ore resources and has a negative impact on both economic and resource sustainability.

[0003] Common systems for processing iron-containing manganese ores include traditional beneficiation systems, chemical leaching systems, and pyrometallurgical systems. For high-iron, high-phosphorus lean manganese ores and polymetallic symbiotic manganese ores, due to their fine embedded particle size and large differences in properties, traditional beneficiation systems are difficult to obtain satisfactory sorting effects. Although chemical leaching systems and pyrometallurgical systems can improve the sorting effect, there are problems such as complex process flow, high energy consumption, inability to accurately control phase transformation, and the generation of a large amount of waste gas, waste slag and wastewater that easily pollute the environment. For emerging treatment systems such as microbial reduction and microwave reduction, they are still in the experimental stage and cannot be applied on a large scale. Therefore, developing a difficult-to-select iron-manganese ore treatment system that is environmentally friendly, has a large processing capacity, and has more accurate iron and manganese phase transformation is a major problem that needs to be overcome at present. In this context, the difficult-to-select iron-manganese ore treatment system used in the present invention realizes precise regulation of the difficult-to-select iron-manganese mineral phase through an innovative method of simultaneous reduction roasting and selective oxidation in the cooling stage. This technological breakthrough has opened up a new way to recover iron and manganese resources in a greener and more efficient way. Summary of the invention

[0004] In view of the problems existing in the prior art processing system for difficult-to-select ferromanganese ore, the difficult-to-select ferromanganese ore processing system disclosed in the present invention realizes precise control of the physical phase of the difficult-to-select ferromanganese ore through simultaneous reduction roasting and selective oxidation in the cooling stage, thereby recovering ferromanganese resources in a greener and more efficient manner.

[0005] The invention provides a refractory iron-manganese ore sorting system, comprising: a feeding system, a preheating oxidation system, a fluidized synchronous reduction roasting system, a fluidized cooling oxidation system, a grinding magnetic separation system and a dust removal system. The feeding system crushes, dries and disperses the raw ore into powder ore which enters the preheating oxidation system. The powder ore is heated, dehydrated and oxidized by the preheating oxidation system and then enters the fluidized synchronous reduction roasting system for reduction roasting in a reducing atmosphere. The reduced material after reduction roasting enters the fluidized cooling oxidation system. The fluidized cooling oxidation system first performs nitrogen cooling on the reduced material and then performs air cooling to generate a selective oxidation reaction. The discharged cooled material enters the grinding magnetic separation system and is separated and sorted into iron concentrate and manganese concentrate products through efficient magnetic separation. The dust removal system removes dust from the flue gas generated by the preheating oxidation system, the fluidized synchronous reduction roasting system and the fluidized cooling oxidation system and then discharges it.

[0006] Furthermore, the feeding system includes: a silo, a loss-in-weight scale, a 1# ball mill, a material dryer and a material disperser. The silo outlet is opposite to one end of the loss-in-weight scale, the other end of the loss-in-weight scale is connected to the feed port of the ball mill, the ball mill discharge port is connected to the feed port of the material dryer, the material dryer discharge port is connected to the feed port of the material disperser, and the material disperser discharge port is connected to the feed port of the preheating oxidation system.

[0007] Furthermore, the preheating oxidation system includes: a first-level cyclone separator, a first-level sealing valve, a preheating oxidation reactor, a second-level cyclone separator, a burner and a fan. The feed port of the first-level cyclone separator is connected to the discharge port of the feeding system, the air outlet of the first-level cyclone separator is connected to the air inlet of the dust removal system, the discharge port of the first-level cyclone separator is connected to the inlet of the first-level sealing valve, the outlet of the first-level sealing valve is connected to the feed port in the middle of the preheating oxidation reactor, the feed port of the preheating oxidation reactor is connected to the burner below, the bottom of the preheating oxidation reactor is provided with an air inlet, which is connected to the fan, the lower part and the bottom of the preheating oxidation reactor are provided with flue gas inlets, which are respectively connected to the flue gas outlets of the fluidized synchronous reduction roasting system and the fluidized cooling oxidation system, the discharge port at the top of the preheating oxidation reactor is connected to the feed port of the second-level cyclone separator, the air outlet of the second-level cyclone separator is connected to the feed port of the first-level cyclone separator, and the discharge port of the second-level cyclone separator is connected to the fluidized synchronous reduction roasting system.

[0008] Furthermore, the flue gas inlet at the lower part of the preheating oxidation reactor and the burner connecting port are symmetrically arranged.

[0009] Furthermore, the fluidized synchronous reduction roasting system includes: a secondary sealing valve, a fluidized synchronous reduction reactor and a tertiary cyclone separator, the secondary sealing valve inlet is connected to the secondary cyclone separator discharge port of the preheating oxidation system, the secondary sealing valve outlet is connected to the top feed port of the fluidized synchronous reduction reactor, the top discharge port of the fluidized synchronous reduction reactor is connected to the feed port of the tertiary cyclone separator, the bottom of the fluidized synchronous reduction reactor is provided with a reducing gas and nitrogen inlet, the outlet of the tertiary cyclone separator is connected to the flue gas inlet of the preheating oxidation system, the outlet of the tertiary cyclone separator is connected to the top recovery feed port of the fluidized synchronous reduction reactor, and the upper discharge port of the fluidized synchronous reduction reactor is connected to the feed port of the fluidized cooling oxidation system.

[0010] Furthermore, the fluidized synchronous reduction reactor is provided with 6 reaction chambers in total.

[0011] Furthermore, an electric heating device is provided on the inner wall of the fluidized synchronous reduction reactor.

[0012] Furthermore, the fluidized cooling oxidation system includes: a three-stage sealing valve, a cooling oxidation reactor and a four-stage cyclone separator, the inlet of the three-stage sealing valve is connected to the discharge port of the fluidized synchronous reduction roasting system, the outlet of the three-stage sealing valve is connected to the top feed port of the cooling oxidation reactor, the top discharge port of the cooling oxidation reactor is connected to the feed port of the four-stage cyclone separator, the air outlet of the four-stage cyclone separator is connected to the flue gas inlet of the preheating oxidation system, the discharge port of the four-stage cyclone separator is connected to the recovery feed port at the top of the cooling oxidation reactor, and the upper discharge port of the cooling oxidation reactor is connected to the feed port of the grinding magnetic separation system.

[0013] Furthermore, the grinding magnetic separation system includes: a four-stage sealing valve, a 2# ball mill, a weak magnetic separator, an iron concentrate pool and a manganese concentrate pool, the inlet of the four-stage sealing valve is connected to the discharge port of the fluidized cooling oxidation system, the outlet of the four-stage sealing valve is connected to the feed port of the 2# ball mill, the discharge port of the 2# ball mill is connected to the inlet of the weak magnetic separator, the upper magnetic product outlet of the weak magnetic separator is opposite to the iron concentrate pool, and the bottom of the weak magnetic separator is provided with a manganese concentrate outlet opposite to the manganese concentrate pool.

[0014] Furthermore, the dust removal system includes: a dust collector and a chimney, the dust collector inlet is connected to the air outlet of the preheating oxidation system, and the dust collector outlet is connected to the chimney.

[0015] The system uses fluidized bed roasting technology to bring the reducing gas into close contact with solid materials to produce an efficient gas-solid reaction. The materials are heated through a preheating oxidation system so that they are evenly heated, which is beneficial to the next reduction reaction. The precise transformation of iron-manganese-containing mineral phases occurs in the fluidized bed reduction reaction system and the fluidized bed cooling oxidation system. After the reduction reaction is completed, the mineral dissociation degree is increased through grinding, and then the iron-manganese resources are efficiently separated through a magnetic separation system.

[0016] The main gas flow direction in the present invention is:

[0017] Fluidized synchronous reduction reactor → three-stage cyclone separator, cooling oxidation reactor → four-stage cyclone separator, three-stage cyclone separator and four-stage cyclone separator → preheating oxidation reactor → two-stage cyclone separator → one-stage cyclone separator → dust collector → chimney.

[0018] The material trend of the present invention is:

[0019] Silo→loss-in-weight scale→1# ball mill→material dryer→material disperser→first-stage cyclone separator→first-stage sealing valve→preheating oxidation reactor→second-stage cyclone separator→second-stage sealing valve→fluidized synchronous reduction reactor→third-stage sealing valve→cooling oxidation reactor→fourth-stage sealing valve→2# ball mill→weak magnetic separator→iron concentrate pool, manganese concentrate pool.

[0020] Advantages and effects of the present invention:

[0021] 1. Abandon carbon reducing agents and embrace green hydrogen energy. This system adopts fluidized heating technology to fully stimulate the gas-solid reaction, and has a higher calorific value utilization efficiency than the rotary kiln and other process systems;

[0022] 2. Environmentally friendly. The process fluidized roasting system has its own dust removal device, and there is no need to build a new waste gas treatment device. The system can use green energy hydrogen as reducing gas to achieve zero carbon emissions;

[0023] 3. The process is relatively compact and the processing capacity is large. The process is in a closed state, the process is compact, and the whole process realizes continuous heat supply of materials. In the synchronous reduction roasting, since the reactor is equipped with 6 chambers, more materials can be processed at the same time, which greatly improves the reaction efficiency;

[0024] 4. The process has a high degree of automation. It can realize remote control and reduce the number of operating positions by about 40% compared with the rotary kiln-electric furnace process;

[0025] 5. The system of the present invention can more accurately control the transformation of iron and manganese phases. The generated magnetite (Fe3O4) and hematite (γ-Fe2O3) can more efficiently recover iron resources in difficult-to-select iron-manganese ore, and can accurately transform the phase of manganese ore (MnO), which can reduce the impact of the generation of ferromanganese ore (Mn3O4) and ferromanganese ore (Mn2O3) on subsequent leaching. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a refractory iron-manganese ore separation system according to Example 1 of the present invention;

[0027] Among them, 1. silo, 2. loss-in-weight scale, 3. No. 1 ball mill, 4. material dryer, 5. material disperser, 6. primary cyclone separator, 7. primary sealing valve, 8. preheating oxidation reactor, 9. secondary cyclone separator, 10. secondary sealing valve, 11. fluidized bed synchronous reduction reactor, 12. third-stage cyclone separator, 13. third-stage sealing valve, 14. cooling oxidation reactor, 15. fourth-stage cyclone separator, 16. fourth-stage sealing valve, 17. No. 2 ball mill, 18. weak magnetic separator, 19. iron concentrate pool, 20. manganese concentrate pool, 21. burner, 22. dust collector, 23. fan, 24. chimney. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions in the implementation of the present invention in conjunction with the embodiments and the accompanying drawings. It should be noted that the embodiments described in the present invention are only used to further explain and illustrate, rather than to limit the scope of application. Based on the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the protection scope of the present invention.

[0029] Example 1

[0030] A refractory iron and manganese ore separation system, such as Figure 1 As shown, it includes: a feeding system, a preheating oxidation system, a fluidized synchronous reduction roasting system, a fluidized cooling oxidation system, a grinding magnetic separation system and a dust removal system. The feeding system crushes the raw ore, dries and disperses it into powder ore, which enters the preheating oxidation system. The powder ore is heated, dehydrated and oxidized by the preheating oxidation system, and then enters the fluidized synchronous reduction roasting system for reduction roasting in a reducing atmosphere. The reduced material after reduction roasting enters the fluidized cooling oxidation system. The fluidized cooling oxidation system first nitrogen cools the reduced material, and then air cools it to produce a selective oxidation reaction. The discharged cooled material enters the grinding magnetic separation system, and is separated and selected into iron concentrate and manganese concentrate products through efficient magnetic separation. The dust removal system removes dust from the flue gas generated by the preheating oxidation system, the fluidized synchronous reduction roasting system and the fluidized cooling oxidation system before discharging.

[0031] The feeding system includes: a silo 1, a loss-in-weight scale 2, a 1# ball mill 3, a material dryer 4 and a material disperser 5;

[0032] The preheating oxidation system includes: a primary cyclone separator 6, a primary sealing valve 7, a preheating oxidation reactor 8, a secondary cyclone separator 9, a burner 21 and a fan 23;

[0033] The fluidized synchronous reduction roasting system comprises: a secondary sealing valve 10, a fluidized synchronous reduction reactor 11 and a tertiary cyclone separator 12;

[0034] The fluidized cooling oxidation system includes: a three-stage sealing valve 13, a cooling oxidation reactor 14 and a four-stage cyclone separator 15;

[0035] The grinding magnetic separation system includes: a four-stage sealing valve 16, a 2# ball mill 17, a weak magnetic separator 18, an iron concentrate pool 19 and a manganese concentrate pool 20;

[0036] The dust removal system includes: a dust collector 22 and a chimney 24;

[0037] The outlet of silo 1 is opposite to one end of weight loss scale 2, the other end of weight loss scale 2 is connected to the feed port of 1# ball mill 3, the discharge port of 1# ball mill 3 is connected to the feed port of material dryer 4, the discharge port of material dryer 4 is connected to the feed port of material disperser 5, the discharge port of material disperser 5 is connected to the feed port of primary cyclone separator 6, the air outlet of primary cyclone separator 6 is connected to dust collector 22, the outlet of dust collector 22 is connected to chimney 24, the discharge port of primary cyclone separator 6 is connected to the inlet of primary sealing valve 7, the outlet of primary sealing valve 7 is connected to the feed port in the middle of preheating oxidation reactor 8, a fuel gas inlet is arranged under the feed port of preheating oxidation reactor 8, which is connected to burner 21, and preheating oxidation reactor 8 is connected to the feed port of preheating oxidation reactor 8. The bottom of the preheating oxidation reactor 8 is provided with an air inlet, which is connected to the fan 23. The lower flue gas inlet of the preheating oxidation reactor 8 is connected to the outlet of the third-stage cyclone separator 12. The lower flue gas inlet of the preheating oxidation reactor 8 is connected to the outlet of the fourth-stage cyclone separator 15. The lower flue gas inlet of the preheating oxidation reactor 8 is symmetrically arranged with the fuel gas inlet. The upper discharge port of the preheating oxidation reactor 8 is connected to the feed port of the second-stage cyclone separator 9. The outlet of the second-stage cyclone separator 9 is connected to the feed port of the first-stage cyclone separator 6. The discharge port of the second-stage cyclone separator 9 is connected to the inlet of the second-stage sealing valve 10. The outlet of the second-stage sealing valve 10 is connected to the top feed port of the fluidized synchronous reduction reactor 11. The fluidized synchronous reduction reactor 11 is connected to the feed port of the second-stage sealing valve 10. The reactor 11 is provided with 6 reaction chambers in total. The inner wall of the fluidized synchronous reduction reactor 11 is provided with an electric heating wire. The top discharge port of the fluidized synchronous reduction reactor 11 is connected to the feed port of the three-stage cyclone separator 12. The bottom of the fluidized synchronous reduction reactor 11 is provided with a reducing gas (hydrogen) and nitrogen inlet, and the nitrogen is discharged from the discharge port. The outlet of the three-stage cyclone separator 12 is connected to the lower flue gas inlet of the preheating oxidation reactor 8. The discharge port of the three-stage cyclone separator 12 is connected to the recovery feed port at the top of the fluidized synchronous reduction reactor 11. The upper discharge port of the fluidized synchronous reduction reactor 11 is connected to the inlet of the three-stage sealing valve 13, and the outlet of the three-stage sealing valve 13 is connected to the top inlet of the cooling oxidation reactor 14. The material inlet is connected, the top discharge port of the cooling oxidation reactor 14 is connected with the feed inlet of the four-stage cyclone separator 15, the air outlet of the four-stage cyclone separator 15 is connected with the bottom flue gas inlet of the preheating oxidation reactor 8 of the preheating oxidation system, the discharge port of the four-stage cyclone separator 15 is connected with the top recovery feed inlet of the cooling oxidation reactor 14, the upper discharge port of the cooling oxidation reactor 14 is connected with the inlet of the four-stage sealing valve 16, the outlet of the four-stage sealing valve 16 is connected with the feed inlet of the 2# ball mill 17, the discharge port of the 2# ball mill 17 is connected with the inlet of the weak magnetic separator 18, the upper magnetic product outlet of the weak magnetic separator 18 is opposite to the iron concentrate pool 19, and the manganese concentrate outlet is provided at the bottom of the weak magnetic separator 18, which is opposite to the manganese concentrate pool 20.

[0038] The process flow of a refractory iron-manganese ore separation system of the present invention is as follows:

[0039] The refractory iron-manganese ore particles are transported to the 1# ball mill 3 through the silo 1 and the weight loss scale 2 for grinding, and then enter the material dryer 4 and the material disperser 5 in sequence for drying and dispersion, and then enter the primary cyclone separator 6 together with the dust-containing flue gas after gas-solid separation in the secondary cyclone separator 9 for gas-solid separation. The separated dust-containing flue gas is sent to the dust collector 22 and then discharged through the chimney 24. The separated material flows in one direction through the primary sealing valve 7 (the sealing valve effectively isolates the gas from flowing in reverse) and enters the preheating oxidation reactor 8. The material entering the preheating oxidation reactor 8 passes through the third cyclone separator 12 and the fourth cyclone separator 13. The circulating hot flue gas sent into the cyclone separator 15 is preheated, and the burner 21 heats the air. The material moves from bottom to top under the action of the hot flue gas and air and enters the secondary cyclone separator 9. After gas-solid separation in the secondary cyclone separator 9, the material flows unidirectionally to the fluidized synchronous reduction reactor 11 through the secondary sealing valve 10, and passes through the 6 reaction chambers of the fluidized synchronous reduction reactor 11 in sequence. The inner wall of the fluidized synchronous reduction reactor 11 is provided with an electric heating wire. H2 and N2 are introduced from the lower part of the fluidized synchronous reduction reactor 11. During the flow of the material, the hematite and pyrolusite contained in the iron-manganese ore are continuously reduced. The original reaction gradually transforms into magnetite and harzburgite. The flue gas at the top discharge port of the fluidized synchronous reduction reactor 11 carries fine particles into the three-stage cyclone separator 12. After gas-solid separation, the solid materials are recovered to the fluidized synchronous reduction reactor 11. The flue gas is sent to the flue gas inlet at the lower part of the preheating oxidation reactor 8. After the reduction reaction, the material enters the cooling oxidation reactor 14 through a one-way flow through the three-stage sealing valve 13. N2 cooling is first performed, and then air cooling is performed. After the reduction reaction, the material undergoes a targeted selective oxidation reaction in the cooling oxidation reactor 14, and the magnetite (Fe3O4) is accurately converted to The flue gas carries the fine particles into the four-stage cyclone separator 15. After gas-solid separation, the flue gas enters the flue gas inlet at the bottom of the preheating oxidation reactor 8. The solid materials are recovered to the cooling oxidation reactor 14. The materials after the cooling oxidation reaction flow through the four-stage sealing valve 16 in a one-way manner and enter the No. 2 ball mill 17. The materials are ball-milled to complete dissociation and enter the weak magnetic separator 18 to control the magnetic field strength, and the iron concentrate is sent to the iron concentrate pool, and the manganese concentrate is sent to the manganese concentrate pool.

Claims

1. A refractory iron-manganese ore separation system, characterized in that: include: The feeding system includes a feeding system, a preheating oxidation system, a fluidized synchronous reduction roasting system, a fluidized cooling oxidation system, a grinding magnetic separation system and a dust removal system. The feeding system crushes the raw ore, dries it and breaks it into powder ore, which enters the preheating oxidation system. The powder ore is heated, dehydrated and oxidized by the preheating oxidation system, and then enters the fluidized synchronous reduction roasting system for reduction roasting under a reducing atmosphere. The reduced material after reduction roasting enters the fluidized cooling oxidation system. The fluidized cooling oxidation system first cools the reduced material with nitrogen, and then cools it with air to cause a selective oxidation reaction. The discharged cooled material enters the grinding magnetic separation system, and is separated and selected into iron concentrate and manganese concentrate products through efficient magnetic separation. The dust removal system removes dust from the flue gas generated by the preheating oxidation system, the fluidized synchronous reduction roasting system and the fluidized cooling oxidation system before discharging.

2. A refractory iron-manganese ore separation system as claimed in claim 1, characterized in that: The feeding system includes: a silo, a loss-in-weight scale, a No. 1 ball mill, a material dryer and a material disperser. The silo outlet is opposite to one end of the loss-in-weight scale, the other end of the loss-in-weight scale is connected to the feed port of the ball mill, the ball mill discharge port is connected to the feed port of the material dryer, the material dryer discharge port is connected to the feed port of the material disperser, and the material disperser discharge port is connected to the feed port of the preheating oxidation system.

3. A refractory iron-manganese ore separation system as claimed in claim 1, characterized in that: The preheating oxidation system comprises: a primary cyclone separator, a primary sealing valve, a preheating oxidation reactor, a secondary cyclone separator, a burner and a fan. The feed port of the primary cyclone separator is connected to the discharge port of the feeding system, the air outlet of the primary cyclone separator is connected to the air inlet of the dust removal system, the discharge port of the primary cyclone separator is connected to the inlet of the primary sealing valve, the outlet of the primary sealing valve is connected to the feed port in the middle of the preheating oxidation reactor, the feed port of the preheating oxidation reactor is connected to the burner below, the bottom of the preheating oxidation reactor is provided with an air inlet, which is connected to the fan, the lower part and the bottom of the preheating oxidation reactor are provided with flue gas inlets, which are respectively connected to the flue gas outlets of the fluidized synchronous reduction roasting system and the fluidized cooling oxidation system, the discharge port at the top of the preheating oxidation reactor is connected to the feed port of the secondary cyclone separator, the air outlet of the secondary cyclone separator is connected to the feed port of the primary cyclone separator, and the discharge port of the secondary cyclone separator is connected to the fluidized synchronous reduction roasting system.

4. A refractory iron-manganese ore separation system as claimed in claim 3, characterized in that: The flue gas inlet at the lower part of the preheating oxidation reactor and the burner connecting port are symmetrically arranged.

5. A refractory iron-manganese ore separation system as claimed in claim 1, characterized in that: The fluidized synchronous reduction roasting system includes: a secondary sealing valve, a fluidized synchronous reduction reactor and a tertiary cyclone separator, the inlet of the secondary sealing valve is connected to the discharge port of the secondary cyclone separator of the preheating oxidation system, the outlet of the secondary sealing valve is connected to the top feed port of the fluidized synchronous reduction reactor, the top discharge port of the fluidized synchronous reduction reactor is connected to the feed port of the tertiary cyclone separator, the bottom of the fluidized synchronous reduction reactor is provided with a reducing gas and nitrogen inlet, the outlet of the tertiary cyclone separator is connected to the flue gas inlet of the preheating oxidation system, the discharge port of the tertiary cyclone separator is connected to the top recovery feed port of the fluidized synchronous reduction reactor, and the upper discharge port of the fluidized synchronous reduction reactor is connected to the feed port of the fluidized cooling oxidation system.

6. A refractory iron-manganese ore separation system as claimed in claim 5, characterized in that: The fluidized synchronous reduction reactor is equipped with 6 reaction chambers in total.

7. A refractory iron-manganese ore separation system as claimed in claim 5, characterized in that: The inner wall of the fluidized synchronous reduction reactor is provided with an electric heating device.

8. A refractory iron-manganese ore separation system as claimed in claim 1, characterized in that: The fluidized cooling oxidation system includes: a three-stage sealing valve, a cooling oxidation reactor and a four-stage cyclone separator, the inlet of the three-stage sealing valve is connected to the discharge port of the fluidized synchronous reduction roasting system, the outlet of the three-stage sealing valve is connected to the top feed port of the cooling oxidation reactor, the top discharge port of the cooling oxidation reactor is connected to the feed port of the four-stage cyclone separator, the air outlet of the four-stage cyclone separator is connected to the flue gas inlet of the preheating oxidation system, the discharge port of the four-stage cyclone separator is connected to the top recovery feed port of the cooling oxidation reactor, and the upper discharge port of the cooling oxidation reactor is connected to the feed port of the grinding magnetic separation system.

9. A refractory iron-manganese ore separation system as claimed in claim 1, characterized in that: The grinding magnetic separation system includes: a four-stage sealing valve, a No. 2 ball mill, a weak magnetic separator, an iron concentrate pool and a manganese concentrate pool. The inlet of the four-stage sealing valve is connected to the discharge port of the fluidized cooling oxidation system, the outlet of the four-stage sealing valve is connected to the feed port of the No. 2 ball mill, the discharge port of the No. 2 ball mill is connected to the inlet of the weak magnetic separator, the magnetic product outlet on the upper part of the weak magnetic separator is opposite to the iron concentrate pool, and the manganese concentrate outlet is provided at the bottom of the weak magnetic separator, opposite to the manganese concentrate pool.

10. A refractory iron-manganese ore separation system as claimed in claim 1, characterized in that: The dust removal system comprises: a dust collector and a chimney, the dust collector inlet is connected with the air outlet of the preheating oxidation system, and the dust collector outlet is connected with the chimney.

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