A method of reinforced pelletization of iron ore blends with composite drive

Abstract

The present application relates to a kind of composite drive's iron ore mixture intensification granulation method, first sintered material is added from the feed inlet on the storage hopper into storage hopper;Motor and water pump are started, motor drives shearing knife fast rotation, external storage hopper is rotated simultaneously, so that sintered material is rapidly and uniformly mixed in mixing area, while spraying atomized water on the surface of sintered material, sintered material gradually slides from mixing area to granulation area;After sintered material enters granulation area, continue to spray atomized water to the material in granulation area, sintered material particles that surface is fully wetted under the action of high-speed rotating shearing knife, constantly collide, rub, extrude, gradually coalesce and grow to form sintered raw material quasi-particle with uniform particle size, after granulation, sintered raw material particles are discharged from the discharge port on the storage hopper.The present application method improves the collision frequency between sintered material particles by the simultaneous rotation of shearing knife inside the storage hopper and external storage hopper, reduces the segregation of material composition and particle size, and obtains better granulation effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sintering in the metallurgical industry, in particular to a composite driving method for strengthening granulation of iron ore mixture. BACKGROUND

[0002] As an important process of steel production, blast furnace ironmaking is to load iron-containing raw materials, fuels and other auxiliary raw materials into the blast furnace in the appropriate proportion, and to ensure the smooth movement of iron ore mixture in the blast furnace, so as to carry out the subsequent ironmaking process and obtain qualified molten iron. However, for natural ores, their different chemical properties and particle size distribution cannot effectively ensure the uniformity of the materials entering the blast furnace. At the same time, in order to ensure good permeability and low coke ratio of the blast furnace, the iron-containing raw materials must be agglomerated. At present, sintering is one of the main agglomeration processes used in China, and sinter still dominates the ironmaking production in China, with the average proportion of sinter in the blast furnace charge being more than 75%. Although the sintering process has been criticized for its long-term pollution emission problem, its advantages such as wide adaptability to raw materials, strong solid waste disposal capacity, high production efficiency and outstanding metallurgical performance are still irreplaceable by other processes. From the comprehensive point of view of the current industrial situation, resource conditions and steel supply and demand relationship in China, sintering will still occupy a dominant position in the future. Sinter is a man-made rich ore with a certain particle size composition, which is obtained by mixing uniform iron-containing raw materials such as powder ore, concentrate and sintered return ore with fluxes such as limestone and dolomite and fuel, then increasing the particle size of the mixture to a certain extent through the granulation link, and then sintering through the sintering machine. In this process, factors such as uniformity of composition, accurate particle size and moisture of the mixture in the mixing and granulation link directly affect the vertical sintering speed in the subsequent sintering process and the quality of the sinter, so the mixing and granulation link is particularly important in the whole sintering process.

[0003] The existing granulation process mainly uses a cylindrical mixer for mixing and granulation, and according to the different types of processed ores and particle sizes, it can be divided into two-stage cylindrical granulation and three-stage cylindrical granulation processes. The two-stage cylindrical granulation process is divided into two links of primary mixing and secondary mixing. The primary mixing type sintering is a mixing process of raw materials with part of water, and the secondary mixing is a granulation process of the mixture. The three-stage process is an additional granulation process based on the two-stage granulation process.

[0004] The core equipment of the granulation process is a cylindrical mixer, which has the advantages of simple equipment and low cost. However, it is difficult for the cylindrical mixer to uniformly disperse the moisture, and uneven distribution of moisture may lead to uneven distribution of particle size, thereby affecting the granulation effect. In addition, the mixing of sintering material in the cylinder is mainly in the radial direction, and it is difficult to mix uniformly in the axial direction, thereby causing segregation of raw material components. And with the increase of the proportion of fine iron concentrate in the sintering raw material, higher requirements are put forward for the mixing and granulation of the raw material. Especially, the traditional sintering process is designed based on rich ore powder sintering, and cannot effectively handle a large amount of fine iron ore with poor wettability. The mixing and granulation effect is poor when the proportion of fine ore is high. The traditional cylindrical granulation process cannot meet the requirements of granulation of poor wettability and thick material layer sintering. Therefore, it is necessary to improve the existing sintering granulation process, improve the uniformity of sintering raw material in the granulation process, and obtain granules with uniform particle size and better strength, thereby improving the sintering speed and sinter quality.

[0005] In recent years, experts have proposed a strong mixing process. Chinese patent CN108114626A proposes a mixer for improving the uniformity of sinter granulation. The idea is also to improve the uniformity of sinter mixing through strong mixing. The strong mixing granulation process does not essentially change the granulation method, but changes the material mixing method. Therefore, this process still belongs to two-stage or three-stage granulation process. Chinese patent CN107304461B proposes a strong mixing process and device for sinter production. The difference between this process and the traditional cylindrical granulation process is that a vertical strong mixer is used instead of a cylindrical mixer for uniform mixing of sintering material. However, the final granulation process still uses a cylindrical mixer. Chinese patent CN111041195A proposes a strong mixing-uniform granulation method for strengthening high-proportion fine raw material sintering. Like Chinese patent CN107304461B, the overall device includes a traditional cylindrical device and a strong mixing device. The device occupies a relatively large area and has a high cost. It cannot solve the problem of scaling on the inner wall of the cylinder during production, which may result in unsatisfactory production efficiency. In addition, it is difficult to design a flexible strong mixer that meets the requirements. SUMMARY

[0006] In view of the above problems existing in the prior art, the technical problem to be solved by the present application is how to economically and efficiently install a rotating shaft and a shearing knife in a large cylindrical granulation device, that is, to add a shearing knife inside the cylindrical device without affecting the normal operation of the external cylindrical device, and to improve the mixing and granulation effect of the granulator.

[0007] To solve the above technical problems, the application adopts the following technical scheme: a composite driving iron ore mixture intensified granulation method, characterized in that: an improved cylinder mixer is used, the improved cylinder mixer comprises a storage barrel, a transmission shaft is arranged in the storage barrel along the length direction of the storage barrel, one end of the transmission shaft is fixedly connected with a motor, a plurality of connecting rods are arranged on the transmission shaft, the plurality of connecting rods are uniformly arranged along the length direction of the transmission shaft, and the projection of the plurality of connecting rods on the upper end face or the lower end face of the storage barrel is equal in included angle between adjacent two connecting rods;

[0008] The other end of the connecting rod is fixedly connected with a shearing knife.

[0009] The storage barrel can be divided into a mixing area, a granulation area and a discharge area along the length direction of the storage barrel, wherein the axial length of the mixing area accounts for 20% to 30% of the total axial length of the storage barrel, the axial length of the granulation area accounts for 60% to 70% of the total axial length of the storage barrel, and the axial length of the discharge area accounts for 5% to 10% of the total axial length of the storage barrel.

[0010] The iron ore mixture intensified granulation method comprises the following steps:

[0011] S1: uniformly mixed ore, iron concentrate, dolomite, limestone, quicklime, coke and returned ore are weighed according to the existing mass percentage to obtain sintering material;

[0012] The sintering material is added into the storage barrel from the feeding port on the storage barrel.

[0013] The filling rate of the sintering material in the storage barrel is not more than 15%.

[0014] S2: start the motor and the water pump, the motor drives the shearing knife to rotate rapidly, the terminal linear velocity of the shearing knife is controlled to be 1.5-3.0 m / s, specifically, it can be selected as 1.5 m / s, 1.8 m / s, 2 m / s, 2.5 m / s or 3.0 m / s, preferably 1.9 m / s, the linear velocity of the outer storage barrel is controlled to be 1.0-1.6 m / s, 1.0 m / s, 1.2 m / s or 1.6 m / s, preferably 1.4 m / s, the sintering material is rapidly and uniformly mixed in the mixing area, and at the same time, 80% of the total added water is sprayed on the surface of the sintering material in the form of atomized water, the particle size of the water droplets is controlled to be in the range of 0.3-0.5 mm; under the action of the shearing knife, the water is uniformly distributed on the surface of the sintering material particles, and the sintering material gradually slides from the mixing area to the granulation area.

[0015] S3: after the sintering material enters the granulation area, 20% of the total added water is continuously sprayed on the material in the granulation area in the form of atomized water, the particle size of the water droplets is controlled to be in the range of 0.2-0.3 mm, and the sintering material particles with fully wetted surface are continuously collided, rubbed and extruded under the action of the high-speed rotating shearing knife, gradually coalesce and grow to form sintering raw material quasi-particles with uniform particle size.

[0016] S4: After the granulation is completed, the sintered raw material quasi-particles that come out of the granulation zone are subjected to post-granulation treatment in the discharge area to obtain sintered raw material particles, and the sintered raw material particles are discharged from the discharge port on the storage barrel.

[0017] Preferably, the shearing knife is plow-shaped, and the front part is a triangular sharp head.

[0018] Preferably, the transmission shaft is combined by a plurality of transmission shaft segments, two adjacent transmission shaft segments are connected through a shaft coupling, and a support rod with one end penetrating through the shaft coupling is fixed at the connection of the two adjacent transmission shaft segments. A plurality of support rods are arranged in a diverging manner along the radial direction of the transmission shaft, and the included angle of adjacent two support rods is equal.

[0019] Preferably, the ratio of the rotating diameter of the shearing knife to the diameter of the storage barrel is 0.75-1.0, and can be 0.75, 0.8, 0.9 or 1.0.

[0020] Preferably, the included angle between the transmission shaft and the horizontal line is 0-10°, and can be 2°, 3°, 5°, 7°, 8° or 10°.

[0021] Preferably, the rotating directions of the storage barrel and the shearing knife are opposite.

[0022] Compared with the prior art, the present application has at least the following advantages:

[0023] 1. The present application adopts a composite driving mode to independently rotate the shearing knife and the storage barrel. This scheme can directly modify the original storage barrel, reduce investment costs, and combine mixing and granulation to reduce the demand for land.

[0024] 2. The size and rotating diameter of the shearing knife added to the cylindrical mixer can be designed as needed to reduce manufacturing costs and installation difficulty. In the present application, the transmission shaft is installed in sections to ensure the strength of the transmission shaft and reduce the manufacturing cost of the transmission shaft.

[0025] 3. The present application increases a high-speed rotating shearing knife on the basis of the original mixing cylinder, and the axial and radial forces generated by the collision of the sintered material particles make the mixing effect of the sintered material particles better than that of a simple cylindrical mixer, reducing the segregation of the composition and particle size of the material, and making the water distribution in the device more uniform.

[0026] 4. The present application can realize reverse rotation of the shearing knife and the storage barrel due to the use of a composite driving mode. Since the particles form a circulating flow in the bottom area of the cylinder and have more opportunities for friction and collision in the bottom area, the mixing and granulation effects are better.

[0027] 5. By applying the method provided by this invention, and taking into account investment costs, the rotational motion of the shearing blade added to the original cylinder can overcome problems such as scaling on the inner wall of the cylinder, thereby reducing maintenance time and costs. Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of the improved cylindrical mixer, including a storage tank.

[0029] Figure 2 for Figure 1 The front view.

[0030] In the diagram, the components are: storage bin-1, drive shaft-2, shearing blade-3, connecting rod-4, support rod-5, coupling-6, inlet-7, and outlet-8. Detailed Implementation

[0031] The present invention will now be described in further detail.

[0032] This invention proposes a composite-driven enhanced granulation method for iron ore mixtures. By simultaneously rotating the shear blades inside the storage tank and the storage tank outside, the collision frequency between sintered material particles is increased, reducing the segregation of material composition and particle size, and achieving better granulation results.

[0033] See Figure 1 and Figure 2 A composite-driven method for enhanced granulation of iron ore mixtures is disclosed, employing an improved cylindrical mixer. The improved cylindrical mixer includes a storage hopper, inside which a drive shaft 2 is arranged along its length. One end of the drive shaft 2 is fixedly connected to a motor. The improved cylindrical mixer includes two motors: one for driving the drive shaft 2 and the other for driving the storage hopper. Multiple connecting rods 4 are provided on the drive shaft 2, evenly arranged along its length. The included angle between adjacent connecting rods 4 is equal in their projections onto the upper or lower end face of the storage hopper. A shearing blade 3 is fixedly connected to the other end of each connecting rod 4.

[0034] The storage tank can be divided into a mixing zone, a granulation zone, and a discharge zone along its length. The axial length of the mixing zone accounts for 20% to 30% of the total axial length of the storage tank, the axial length of the granulation zone accounts for 60% to 70% of the total axial length of the storage tank, and the axial length of the discharge zone accounts for 5% to 10% of the total axial length of the storage tank.

[0035] The method for strengthening the granulation of iron ore mixtures includes the following steps:

[0036] S1: Weigh the mixed ore, iron concentrate, dolomite, limestone, quicklime, coke, and return ore according to the existing mass percentages to obtain the sintering material.

[0037] The sintering material is added into the storage bucket from the feeding port 7 on the storage bucket, and the filling rate of the sintering material in the storage bucket is not more than 15%.

[0038] S2: Start the motor and the water pump, and start the motor to drive the shearing knife 3 to rotate rapidly. The terminal linear velocity of the shearing knife 3 is controlled to be 1.5-3.0 m / s, preferably 1.9 m / s, and the linear velocity of the outer storage bucket is controlled to be 1.0-1.6 m / s, preferably 1.4 m / s, so that the sintering material is rapidly and uniformly mixed in the mixing area, and at the same time, 80% of the total added water is sprayed on the surface of the sintering material in the form of atomized water, and the particle size of the water droplets is controlled to be 0.3-0.5 mm. Under the action of the shearing knife 3, the water is uniformly distributed on the surface of the sintering material particles, and the sintering material gradually slides from the mixing area to the granulation area, and reaches the granulation area under the rotation and conveying of the shearing knife 3.

[0039] S3: After the sintering material enters the granulation area, continue to spray 20% of the total added water on the material in the granulation area in the form of atomized water, and control the particle size of the water droplets to be 0.2-0.3 mm. The sintering material particles with fully wetted surface are continuously collided, rubbed and extruded under the action of the high-speed rotating shearing knife 3, and gradually coalesce and grow to form sintered raw material quasi-particles with uniform particle size.

[0040] S4: After the granulation is completed, the sintered raw material quasi-particles from the granulation area are subjected to post-granulation treatment in the discharging area to obtain sintered raw material particles, which are discharged from the discharging port 8 on the storage bucket.

[0041] Specifically, the shearing knife 3 is plow-shaped, and the front part is a triangular sharp head. The triangular sharp head at the front part can drive the raw material to be lifted by entering the inside of the material, and the smooth curved surface structure at the rear part plays a flow dividing role, so that the material particles move to both sides, promoting the axial movement of the material.

[0042] Specifically, the transmission shaft 2 is composed of a plurality of transmission shaft segments, and adjacent two transmission shaft segments are connected through a shaft coupling 6. A support rod 5 with one end penetrating through the shaft coupling 6 is fixed at the connection position of the adjacent two transmission shaft segments. The support rod 5 is in a plurality, and the plurality of support rods 5 are arranged in a divergent manner along the radial direction of the transmission shaft 2, and the included angle of adjacent two support rods 5 is equal. The transmission shaft is divided into multiple segments for connection, and a support rod 5 is added at the connection position to ensure that the transmission shaft will not be elastically fluctuated up and down due to the excessive length, and the strength and rigidity of the shaft are increased. The side of the support rod connected with the transmission shaft 2 is fixedly connected, so that it can be synchronized with the rotation of the external cylinder. The support rod is connected with the two transmission shafts through the shaft coupling 6 on one side of the transmission shaft, and the shaft coupling and the support rod are fixedly connected, and the two transmission shafts are gap-connected, so that the support rod plays a fixing role while not affecting the movement of the transmission shaft.

[0043] Specifically, the ratio of the rotating diameter of the shearing knife 3 to the diameter of the storage barrel is 0.75-1.0. When the ratio is 1.0, the particles are mixed more uniformly, but the requirement for the material is higher due to the large torque of the shearing knife. When the ratio is less than 0.75, the kinetic energy of the sintering material particles increases slowly, which affects the granulation effect.

[0044] Specifically, the angle between the transmission shaft 2 and the horizontal line is 0-10°. The transmission shaft is thus arranged to reduce the hindering effect of the support rod and the connecting rod on the axial movement of the raw material, and to ensure that the raw material moves from the inlet to the outlet. The speed of the raw material moving is different at different angles between the transmission shaft and the horizontal line. Specifically, when the length of the cylinder is 13.4 m, the angle between the transmission shaft and the horizontal line is set to 2.5°, the transmission shaft is slowly inclined from left to right, the left end of the transmission shaft is high, and the right end is low. At this time, the mixing+granulation time is 8 min.

[0045] Specifically, the rotation directions of the storage barrel and the shearing knife 3 are opposite, that is, the storage barrel and the shearing knife 3 adopt the reverse rotation mode. At this time, the kinetic energy of the particles is the largest, a circulating flow is formed in the bottom area of the cylinder, and the particles have more opportunities to collide and rub in the bottom area, which is the most favorable for granulation.

[0046] Embodiment 1: A composite driving method for strengthening the granulation of iron ore mixture, comprising the following steps:

[0047] S1: The mixed ore, iron concentrate, dolomite, limestone, quicklime, coke and returned ore are weighed according to the existing mass percentage, as shown in Table 1. The particle size distribution of the iron ore powder is shown in Table 2.

[0048] The prepared sintering material is added into the storage barrel through the inlet 7, and the filling rate of the sintering material in the storage barrel is 15%.

[0049] S2: Start the motor and the water pump, start the motor to drive the shearing knife to rotate quickly, adjust the frequency converter to control the linear speed of the end of the shearing knife 3 to be 1.9 m / s, and the linear speed of the outer storage barrel to be 1.4 m / s, so that the sintering material is quickly and uniformly mixed in the mixing area. At the same time, spray 80% of the total added water on the surface of the sintering material in the form of atomized water, control the particle size of the water droplets to be between 0.3-0.5 mm; under the action of the shearing knife 3, the water is uniformly distributed on the surface of the sintering material particles, and the raw material gradually slides from the mixing area to the granulation area. Under the rotation and transmission of the shearing knife, it reaches the granulation area.

[0050] S3: After the sintering material enters the granulation area, continue to spray 20% of the total added water on the material in the granulation area in the form of atomized water, control the particle size of the water droplets to be between 0.2-0.3 mm, and the surface of the sintering material particles is fully wetted. Under the action of the high-speed rotating shearing knife, the sintering material particles collide, rub and extrude constantly, gradually coalesce and grow to form sintering raw material quasi-particles with uniform particle size.

[0051] S4: After the granulation is completed, the sintered green sinter quasi-particles discharged from the granulation zone are subjected to post-granulation treatment in the discharging zone to obtain sintered green sinter particles, which are discharged from the discharging port.

[0052] The total amount of water to be added is calculated in advance in the granulation process, so that the moisture content of the sintered green sinter particles is 8.8 wt.%. After the granulation is completed, the sintered green sinter particles are distributed into the sintering pot. First, 2 kg of finished sinter with a particle size of 10-16 mm is loaded into the bottom of the sintering pot to form a bottom layer with a thickness of 10 mm, and then the sintering mixture is added to the sintering pot. The ignition device is moved to directly above the sintering pot, and then the combustion-supporting fan is started, and pre-ventilation is performed for 1 min before ignition. Ignition is performed at an ignition temperature of 1050℃ for 2 min, and after the ignition is completed, the ignition device is removed, and then sintering is performed under a negative pressure of 10 kPa. The particle size, air permeability index and sinter index of the mixture after granulation according to the present application are shown in Tables 3 and 4.

[0053] Comparative Example 1

[0054] The mixed ore, iron concentrate, dolomite, limestone, quicklime, coke and returned ore are weighed according to the existing mass percentage, as shown in Table 1. First, the prepared sintering mixture is added to the cylindrical mixer, and the motor is started to control the linear velocity of the cylinder at 1.4 m / s. The mixture is subjected to first-stage cylindrical mixing, and 80% of the total amount of added water is sprayed as atomized water with a droplet size range of 0.3-0.5 mm. Then, the mixed material is added to the second-stage cylinder for granulation, and 20% of the total amount of added water is sprayed as atomized water with a droplet size range of 0.2-0.3 mm to the material in the granulation zone. The sintering mixture particles with a fully wetted surface are continuously subjected to collision, friction and extrusion under the action of the rotation of the cylinder, gradually coalesce and grow to form sintered green sinter quasi-particles with uniform particle size. The total amount of water to be added is calculated in advance in this process, so that the moisture content of the green sinter quasi-particles is about 8.8 wt.%. After the granulation is completed, the granulated mixture is distributed into the sintering pot, and ignition is performed at an ignition temperature of 1050℃ for 2 min, and then sintering is performed under a negative pressure of 10 kPa. The particle size, air permeability index and sinter index of the mixture after granulation according to the present application are shown in Tables 3 and 4.

[0055] Table 1 Mass percentage of sintering raw materials

[0056] Variety Mixed ore Iron concentrate Dolomite Limestone Quicklime Coke breeze Return fines Proportion / % 42.96 25.00 2.86 2.67 3.48 3.38 19.65

[0057] Table 2 Particle size composition of iron ore fines

[0058] Particle size / mm >8 5~8 3~5 2~3 1~2 0.5~1 <0.5 Proportion / % 2.22 12.39 14.96 10.55 13.51 34.20 12.17

[0059] Table 3 Granule size composition of the mixed material after granulation

[0060] Scheme Average particle size / mm +3 mm content / % Uniformity index / % Permeability index / JPU Degree of crushing / number of times Example 1 4.8 65 63 47 11 Comparative Example 1 4.3 52 48 23 19

[0061] Table 4 Sinter quality indicators

[0062] Granulation process Bed thickness / mm Vertical sintering speed / mm min -1 ]] Sintered ore yield / % Drop strength / % Tumbler index / % High shear granulation 500 27.32 82.95 89.78 73.04 Cylinder granulation 500 25.25 82.05 83.23 71.66 High shear granulation 900 22.50 83.14 85.43 74.41 Cylinder granulation 900 19.56 81.37 88.81 71.74

[0063] According to the results in Table 3, the proportion of +3 mm particle size in the quasi-particles obtained by the high-shear granulator is significantly higher than that of the drum granulator, and the uniformity index of the quasi-particles obtained by the high-shear granulator is significantly higher than that of the drum granulator, which can obtain quasi-particles with more uniform particle size. Under the same concentrate proportion, the permeability of the quasi-particle layer obtained by the high-shear granulator is about 24 JPU higher than that of the drum granulator. Quasi-particles with uniform particle size have good permeability, which ensures the subsequent downdraft sintering process, indicating that the high-shear granulator has better granulation capacity than the drum granulator under the same conditions.

[0064] According to the results shown in Table 4, when the sintering mixture prepared by the high-shear granulation process is sintered, the vertical sintering speed of the quasi-particles obtained is significantly higher than that of the drum granulator. Further analysis of the sintered ore yield obtained from the sintering cup experiment shows that the sintered ore yield obtained by the high-shear granulation process is higher, indicating that the quasi-particles obtained by the high-shear granulator can obtain sintered ore with higher yield at a faster vertical sintering speed. In addition, the sintered ore drop strength and drum index corresponding to the high-shear process are higher than those of the drum process. The main reason is that the quasi-particles obtained by the high-shear process have good particle size uniformity, the sintering material layer has a relatively loose accumulation structure, good permeability, and a relatively uniform sintering process, and the temperature distribution in the sintering material layer is relatively uniform. The generated binding liquid phase can also smoothly adhere to the surface of the particles, and after cooling and crystallization, it forms sintered ore with better strength. Overall, the high-shear granulation process can obtain sintered ore with better quality than the drum granulation process at a faster speed, so its efficiency is significantly higher.

[0065] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, which should be covered by the scope of the claims of the present application.

Claims

1. A method of composite driven iron ore burden intensification granulation, characterized by: The improved cylinder mixer is used, which comprises a storage barrel, a transmission shaft (2) arranged in the length direction of the storage barrel, one end of the transmission shaft (2) is fixedly connected with a motor, a plurality of connecting rods (4) are arranged on the transmission shaft (2), the plurality of connecting rods (4) are uniformly arranged along the length direction of the transmission shaft (2), and the included angle of adjacent two connecting rods (4) is equal in the projection of the upper end face or the lower end face of the storage barrel; The other end of the connecting rod (4) is fixedly connected with a shearing knife (3); the shearing knife (3) is plow-shaped, the front part is a triangular sharp head; The transmission shaft (2) is composed of a plurality of transmission shaft segments, adjacent two transmission shaft segments are connected through a shaft coupling (6), the connecting position of the adjacent two transmission shaft segments is fixedly connected with a support rod (5) penetrating through the shaft coupling (6), the support rod (5) is a plurality of, the plurality of support rods (5) are arranged in a divergent shape along the radial direction of the transmission shaft (2), and the included angle of adjacent two support rods (5) is equal; The rotation directions of the storage barrel and the shearing knife (3) are opposite; The storage barrel is divided into a mixing area, a granulating area and a discharging area along the length direction, wherein the axial length of the mixing area accounts for 20% to 30% of the total axial length of the storage barrel, the axial length of the granulating area accounts for 60% to 70% of the total axial length of the storage barrel, and the axial length of the discharging area accounts for 5% to 10% of the total axial length of the storage barrel; The iron ore mixture strengthening granulation method comprises the following steps: S1: uniformly mixing the mixed ore, iron concentrate, dolomite, limestone, quicklime, coke and returned ore according to the existing mass percentage to obtain sintering material; The sintering material is added into the storage barrel from the feeding port (7) on the storage barrel; The filling rate of the sintering material in the storage barrel is not more than 15%; S2: start the motor and the water pump, the motor drives the shearing knife (3) to rotate rapidly, the terminal linear velocity of the shearing knife (3) is controlled to be 1.5-3.0 m / s, the rotation linear velocity of the outer storage barrel is controlled to be 1.0-1.6 m / s, the sintering material is rapidly and uniformly mixed in the mixing area, and at the same time, 80% of the total added water is sprayed on the surface of the sintering material in the form of atomized water, the water droplet size is controlled to be 0.3-0.5 mm; under the action of the shearing knife (3), the water is uniformly distributed on the surface of the sintering material particles, and the sintering material gradually slides from the mixing area to the granulating area; S3: after the sintering material enters the granulating area, 20% of the total added water is continuously sprayed on the material in the granulating area in the form of atomized water, the water droplet size is controlled to be 0.2-0.3 mm, and the sintering material particles with fully wetted surface are continuously collided, rubbed and extruded under the action of the high-speed rotating shearing knife (3), gradually coalesce and grow to form sintering green material quasi-particles with uniform particle size; S4: after the granulation is completed, the sintering green material quasi-particles from the granulating area are subjected to post-granulation treatment in the discharging area to obtain sintering green material particles, and the sintering green material particles are discharged from the discharging port (8) on the storage barrel.

2. A method of composite driven iron ore burden intensively granulating as claimed in claim 1 wherein: The rotation diameter of the shearing knife (3) and the diameter of the storage barrel are in a ratio of 0.75-1.

0.

3. A method of composite driven iron ore burden intensively granulating as claimed in claim 2 wherein: The included angle between the transmission shaft (2) and the horizontal line is 0-10°.

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