Circulating re-granulating device for sintering mixture

Abstract

The utility model relates to the technical field of sintering mixture grading, and particularly discloses a sintering mixture circulating re-granulating device which comprises a screening structure, and the screening structure comprises a roller screen which is arranged at a discharging port of a secondary mixing machine and is composed of 20 screen rollers. The conveying structure comprises a second belt conveyor arranged below the roller screen and a third belt conveyor arranged below the first discharging opening, fine ore can be pre-screened through the roller screen, particles smaller than 3 mm are pre-screened out of the mixture, and the proportion of the part larger than 3 mm in the sintered mixture is increased; screen underflow smaller than 3 mm is conveyed into the feeding port of the primary mixing machine in the opposite direction through the second belt conveyor, the mixture smaller than 3 mm participates in primary uniform mixing and secondary granulation again, the proportion of the particle fraction smaller than 3 mm of the sintered mixture is reduced, the air permeability of a sintered material layer is effectively improved, a foundation can be provided for sintering of a thick material layer, and the production cost is reduced. Fuel is saved while the quality of sintered ore is improved, and the cost of sintered ore is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sintering mixture grading technical field, specifically disclose a kind of sintering mixture cyclic regranulation device. BACKGROUND

[0002] Currently, the basic process flow of traditional sintering process is: batching-mixing-one mixing-two mixing-sintering-cooling. In the case of fine ore as the main sintering raw material, the two mixing granulation effect has been greatly improved. At present, the proportion of two mixing sintering material >3mm in each large steel enterprise in China is higher than 70%, and some enterprises can reach more than 80%. The improvement of two mixing granulation effect optimizes the permeability of sintering material layer, and then improves the whole sintering yield, quality and preparation.

[0003] To improve the sintering mixture granulation effect, people have developed many new technologies, such as double-layer composite granulation technology, binder adding technology, adding three mixing reinforced granulation technology, particle size optimization technology, etc. The development of these technologies has effectively improved the sintering mixture granulation effect, but also brings additional process or equipment to the sintering process, making the sintering more complex and not easy to operate on site. In addition to the particle size distribution of raw materials, the composition of the mixture, especially the composition of coke powder and quicklime, also has a great influence on the two mixing granulation effect. However, the controllability of sintering raw materials in actual production is relatively small, so it is very important to optimize the sintering granulation from the process point of view.

[0004] The proportion of fine ore in sintering will become larger and larger, and in the process of fine ore sintering granulation, the large particles of fine ore have a great influence on two mixing granulation. It participates in mixing and granulation in two mixing, on the one hand, the surface of large particle fine ore is relatively smooth, which is not suitable for spherical granulation, and on the other hand, it also destroys the spherical particles in the rolling process, which deteriorates the granulation and affects the sintering permeability. Therefore, a sintering mixture cyclic regranulation device is needed to solve this problem. SUMMARY

[0005] The utility model provides a kind of sintering mixture cyclic regranulation device, with can fundamentally solve the proportion of mixture less than 3mm particle level, improve the sintering material layer permeability, can provide basis for sintering thick material layer, improve sintering ore production quality while saving fuel, reduce sintering ore cost.

[0006] The utility model is realized as follows: a kind of sintering mixture cyclic regranulation device, including one mixing machine and two mixing machines and the fifth belt conveyor being arranged between the discharge port of one mixing machine and the feed inlet of two mixing machines, the feed inlet of one mixing machine is provided with the fourth belt conveyor;The other end of the two mixing machines is provided with a screening structure, and a conveying structure is arranged below the screening structure.

[0007] The screening structure comprises a roller screen provided at the discharge port of the secondary mixing machine and composed of 20 screen rollers, the gap between the screen rollers is 3mm, and the inclination angle of the roller screen is 10°.

[0008] The conveying structure comprises a second belt conveyor provided below the roller screen, a first discharge port provided at the left side of the second belt conveyor, a third belt conveyor provided below the first discharge port, and a second discharge port provided between the lower side of the third belt conveyor and the upper side of a fourth belt conveyor.

[0009] Preferably, the first discharge port and the second discharge port are both straight-through discharge ports, and the discharge ports of the first discharge port and the second discharge port are both expanded outward by 15cm.

[0010] Preferably, protective nets are mounted on the two sides of the outer wall of the second belt conveyor through supports.

[0011] Preferably, the roller screen is provided with an inclined first belt conveyor at the downward end.

[0012] Preferably, a baffle is arranged between the lower side of the roller screen and the second belt conveyor.

[0013] Preferably, the roller screen is made of special wear-resistant stainless steel.

[0014] Preferably, supports are mounted on the outer walls of the primary mixing machine and the secondary mixing machine.

[0015] The sintering mixture circulating and re-granulating device has the following advantages:

[0016] 1. The sintering mixture circulating and re-granulating device is provided with the roller screen with a gap of 3mm between the screen rollers, so that the fine ore is pre-screened from the mixture, and the proportion of the mixture larger than 3mm is increased.

[0017] 2. The screened material smaller than 3mm is transported to the feeding port of the primary mixing machine in the reverse direction through the second belt conveyor, so that the mixture smaller than 3mm is re-used for the primary mixing and the secondary granulation, the proportion of the mixture smaller than 3mm is reduced, the permeability of the sintering mixture is effectively improved, the sintering thick layer is provided, the quality of the sintered ore is improved, the fuel is saved, and the cost of the sintered ore is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings used in the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, the elements or parts are not necessarily drawn according to the actual proportions.

[0019] Figure 1 It is a whole structure diagram of the sintering mixture circulating and regranulating device.

[0020] Figure 2 It is a structure diagram of the belt conveyor.

[0021] Figure 3 It is a structure diagram of the discharge port. Figure 4 It is a structure diagram of the second discharge port and the belt conveyor.

[0022] In the drawings, 1, roller screen; 101, baffle; 2, first belt conveyor; 3, second belt conveyor; 301, protective net; 4, first discharge port; 5, third belt conveyor; 6, second discharge port; 7, fourth belt conveyor; 8, primary mixer; 9, fifth belt conveyor; 10, secondary mixer. DETAILED DESCRIPTION

[0023] The present application will be further described below in conjunction with the drawings and specific embodiments, so as to help understand the content of the present application. The methods used in the present application are conventional methods unless otherwise specified; the raw materials and devices used are conventional commercially available products unless otherwise specified.

[0024] Please refer to Figures 1-4 A sintering mixture circulating and regranulating device, comprising a primary mixer 8, a secondary mixer 10 and a fifth belt conveyor 9 arranged between the discharge port of the primary mixer 8 and the feeding port of the secondary mixer 10, a fourth belt conveyor 7 arranged at the feeding port of the primary mixer 8; a screening structure arranged at the other end of the secondary mixer 10, and a conveying structure arranged below the screening structure.

[0025] The screening structure comprises a roller screen 1 arranged at the discharge port of the secondary mixer 10 and composed of 20 screen rollers, the gap between the screen rollers being 3mm, and the inclination angle of the roller screen 1 being 10°.

[0026] The conveying structure comprises a second belt conveyor 3 arranged below the roller screen 1, a first discharge port 4 arranged at the left side of the second belt conveyor 3, a third belt conveyor 5 arranged below the first discharge port 4, and a second discharge port 6 arranged between the third belt conveyor 5 and above the fourth belt conveyor 7.

[0027] In the embodiment, the roller screen 1 with a gap of 3 mm is installed between the discharge port of the secondary mixer 10 and the first belt conveyor 2, so that the fine ore is pre-screened, the particles smaller than 3 mm are pre-screened from the mixture, the proportion of the part larger than 3 mm in the sintering mixture is improved, the second belt conveyor 3 is installed below the roller screen 1 and is used for conveying the mixture smaller than 3 mm screened by the roller screen, the undersize material smaller than 3 mm is conveyed in the reverse direction by the second belt conveyor 3, falls on the third belt conveyor 5 through the first discharge port 4, falls on the fourth belt conveyor 7 through the second discharge port 6, and is conveyed to the feeding port of the primary mixer 8 through the fourth belt conveyor 7, so that the mixture smaller than 3 mm is re-involved in the primary mixing and secondary granulation, the proportion of the sintering mixture smaller than 3 mm is reduced, the sintering layer permeability is effectively improved, the thick sintering layer is provided, the sintering ore production quality is improved, and the fuel is saved and the sintering ore cost is reduced.

[0028] As a technical optimization scheme of the utility model, the first discharge port 4 and the second discharge port 6 adopt straight-through discharge ports, and the discharge ports of the first discharge port 4 and the second discharge port 6 are expanded outward by 15 cm.

[0029] In the embodiment, the first discharge port 4 and the second discharge port 6 adopt straight-through discharge ports and are expanded outward by 15 cm, so that the equipment wear degree is reduced and the service life is prolonged.

[0030] As a technical optimization scheme of the utility model, the two sides of the outer wall of the second belt conveyor 3 are both provided with protective nets 301 through supports.

[0031] In the embodiment, the protective nets 301 can effectively limit the direct contact of workers, equipment and materials, and prevent injury accidents caused by accidental touch or accident.

[0032] As a technical optimization scheme of the utility model, the roller screen 1 is provided with the first belt conveyor 2 arranged in an inclined manner at one end of the roller screen 1.

[0033] In the embodiment, the first belt conveyor 2 can convey the mixture larger than 3 mm to the next sintering process.

[0034] As a technical optimization scheme of the utility model, the roller screen 1 is provided with a baffle 101 below the roller screen 1 and between the baffle 101 and the second belt conveyor 3.

[0035] In the embodiment, the baffle 101 can guide the mixture smaller than 3 mm screened to fall on the second belt conveyor 3 smoothly.

[0036] As a technical optimization scheme of the utility model, the roller screen 1 is made of special wear-resistant stainless steel.

[0037] In the embodiment, the roller screen 1 is made of special wear-resistant stainless steel, which can improve the wear resistance and service life of the roller screen 1, and has good corrosion resistance.

[0038] As a technical optimization scheme of the utility model, the outer wall of the primary mixing machine 8 and the secondary mixing machine 10 is provided with a support.

[0039] In the embodiment, the primary mixing machine 8 and the secondary mixing machine 10 are supported by the support.

[0040] The working principle and use process of the utility model are as follows: the roller screen 1 with a gap of 3 mm is installed between the discharge port of the secondary mixing machine 10 and the first belt conveyor 2, which can pre-screen the fine ore, and the particles smaller than 3 mm are pre-screened from the mixed material, so that the proportion of the part larger than 3 mm in the sintering mixed material is improved; a second belt conveyor 3 is installed below the roller screen 1, which can be used for transporting the mixed material smaller than 3 mm screened by the roller screen, the screened material smaller than 3 mm is transported in the opposite direction by the second belt conveyor 3, falls on the third belt conveyor 5 through the first discharge port 4, and then falls on the fourth belt conveyor 7 through the second discharge port 6, and is transported to the inlet of the primary mixing machine 8 through the fourth belt conveyor 7, so that the mixed material smaller than 3 mm is reused for primary mixing and secondary granulation, the proportion of the sintering mixed material smaller than 3 mm is reduced, the sintering material layer permeability is effectively improved, the sintering thick material layer is provided, the sintering ore production quality is improved, fuel is saved, and the sintering ore cost is reduced.

[0041] In the description of the utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the utility model.

[0042] The above is only a specific embodiment of the utility model, and cannot limit the scope of the utility model, so the replacement of equivalent components or equivalent changes and modifications made within the scope of the utility model patent protection range shall still belong to the scope covered by the claims of the utility model.

Claims

1. A sinter mix recycling granulation plant comprising a primary mixer (8) and a secondary mixer (10) and a fifth belt conveyor (9) disposed between the discharge outlet of the primary mixer (8) and the inlet of the secondary mixer (10), a fourth belt conveyor (7) being disposed at the inlet of the primary mixer (8); characterized in that: The other end of the secondary mixing machine (10) is provided with a screening structure, and the lower side of the screening structure is provided with a conveying structure; The screening structure comprises a roller screen (1) composed of 20 screen rollers and arranged at the discharge port of the secondary mixing machine (10), the gap between the screen rollers is 3mm, and the inclination angle of the roller screen (1) is 10°. The conveying structure comprises a second belt conveyor (3) arranged below the roller screen (1), a first discharge port (4) arranged on the left side of the second belt conveyor (3), a third belt conveyor (5) arranged below the first discharge port (4), and a second discharge port (6) arranged between the lower side of the third belt conveyor (5) and the upper side of a fourth belt conveyor (7).

2. A sinter mix recycle repelletizing apparatus according to claim 1 wherein: The first discharge port (4) and the second discharge port (6) are both straight-through discharge ports, and the discharge ports of the first discharge port (4) and the second discharge port (6) are both expanded outward by 15cm.

3. A sinter mix recycle repelietizing apparatus according to claim 1 wherein: Protective nets (301) are mounted on the two sides of the outer wall of the second belt conveyor (3) through supports.

4. A sinter mix recycle repelietizing apparatus according to claim 1 wherein: The downwardly inclined end of the roller screen (1) is provided with a first belt conveyor (2) arranged obliquely.

5. A sinter mix recycle repelietizing apparatus according to claim 1 wherein: A baffle (101) is arranged between the lower side of the roller screen (1) and the second belt conveyor (3).

6. A sinter mix recycle repelietizing apparatus according to claim 1 wherein: The roller screen (1) is made of special wear-resistant stainless steel.

7. A sinter mix recycle repelletizing apparatus according to claim 2 wherein: Supports are mounted on the outer walls of the primary mixing machine (8) and the secondary mixing machine (10).

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