System for screening iron slag produced by rotary kiln

Abstract

The utility model discloses a system for screening iron slag produced by a rotary kiln, which comprises a screening unit for screening the iron slag, so that the screened iron slag is sent to the next process, and the unscreened iron slag is sent to a steelmaking converter to serve as a cooling agent to be reused; according to the iron slag screening device, iron slag is screened according to the iron-making or steel-making iron-containing material particle size charging standard, so that the iron slag is more effectively and completely recycled, the environmental protection risk of a steel mill is eliminated, and solid waste of the steel mill has certain economic value.

Description

Technical Field

[0001] The utility model belongs to the field of metallurgical solid waste resource recycling, and in particular relates to a system for screening iron slag produced by a rotary kiln. Background Art

[0002] Steelmaking sludge is a metallurgical solid waste, which contains a large amount of iron. Because steelmaking sludge contains a high level of zinc, zinc will corrode the linings of iron-making and steel-making furnaces. Direct addition and use will affect the normal production of the system, and stockpiling will bring certain environmental risks to the steel plant. Therefore, the zinc and iron elements in steelmaking sludge must be separated in order to effectively recycle and reuse the steelmaking sludge.

[0003] A rotary kiln is a device that processes solid materials mechanically, physically or chemically. It is classified into cement kilns, metallurgical chemical kilns and lime kilns. Rotary kilns play an important role in the building materials, metallurgy, chemical industry, environmental protection and other industries. They can improve product quality, output and efficiency, and can also separate iron and zinc elements from steelmaking sludge. However, after the rotary kiln roasts the steelmaking sludge to separate iron and zinc, the iron slag produced is of different sizes and cannot be directly recycled into the furnace for ironmaking or steelmaking. Utility Model Content

[0004] The utility model aims to provide a system for screening iron slag produced by a rotary kiln, so as to solve the problem that the iron slag produced by the rotary kiln has different specifications and sizes and cannot be directly used by a blast furnace and a converter.

[0005] The utility model adopts the following technical scheme: a system for screening iron slag produced by a rotary kiln, comprising: a screening unit, for screening the iron slag, so that the screened iron slag is sent to the next process, and the unscreened iron slag is sent to the steelmaking converter for reuse as a coolant;

[0006] The screening unit includes:

[0007] A plurality of screening rings are arranged at predetermined intervals;

[0008] The connecting frame is composed of four connecting rods, which are arranged along the direction of the plurality of screening rings and are respectively fixedly connected to the screening rings. The connecting frame and the plurality of screening rings cooperate with each other to form a screening shell, which is a grid-shaped cylindrical structure; the screening shell can rotate along its axis;

[0009] The screening net has a plurality of screen holes arranged in an array; it is sleeved on the periphery of the screening shell and fixedly connected to the screening shell;

[0010] Among them, one end of the screening shell is the entrance for iron slag to enter, and the other end is the outlet for iron slag that has not passed through the sieve hole to be discharged. The screening net is used to screen the iron slag that has passed through the gap between two adjacent screening rings through the sieve holes of the screening net again, and the iron slag that has passed through the sieve holes falls downward.

[0011] Further, the screening unit further comprises: a rotating shell and a rotating wheel;

[0012] The rotating shell is a cylindrical structure, which is coaxially arranged with the screening shell, and its inner end is fixedly connected with the outer end of the screening shell;

[0013] The rotating wheel is close to the rotating shell and rests against the outer edge of the rotating shell. The rotating wheel is used to rotate under the drive of the motor, thereby driving the rotating shell to rotate through friction, and then driving the screening shell to rotate, so that the iron slag flows out to the outlet along the axis of the screening shell in a spiral to complete the screening.

[0014] Furthermore, it also includes:

[0015] The first conveyor belt is located below the screening shell and is used to receive the iron slag passing through the sieve holes and perform secondary screening on it. The iron slag that meets the requirements of the blast furnace is transported to the blast furnace for recycling, and the iron slag that does not meet the requirements of the blast furnace is returned to the batching plant to enter the sintering process.

[0016] Furthermore, a second conveyor belt is provided near the outlet of the screening shell for receiving the iron slag that has not passed through the sieve holes and conveying it to the steelmaking converter for reuse as a coolant.

[0017] Furthermore, it also includes:

[0018] Two guide plates are arranged obliquely and are located on both sides of the screening shell to prevent iron slag from flying outwards;

[0019] The chute is located below the screening shell, with its upper end corresponding to the lower ends of the two guide plates and its lower end located just above the first transport belt for guiding the iron slag.

[0020] Furthermore, a plurality of screening units are provided, each used for screening iron slag of different particle sizes.

[0021] The beneficial effects of the utility model are:

[0022] The utility model screens the iron slag according to the iron-containing material particle size entering the furnace standard of iron or steel making, so as to more effectively recycle all the iron slag, which not only eliminates the environmental risk of the steel plant, but also makes the solid waste of the steel plant produce certain economic value;

[0023] The utility model can make the rotating wheel rotate under the drive of the motor, and then drive the rotating shell to rotate along its axis through the friction force, so that the iron slag located in the screening shell rotates, which can be screened continuously, and the distance between the two screening rings can also be set according to the needs of the converter or blast furnace, and the number of screening units can also be set according to the needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Among them: 10, screening unit; 11, screening ring; 12, connecting rod; 13, rotating shell; 14, guide plate; 15, chute. DETAILED DESCRIPTION

[0026] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0027] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. The "direction" in the present utility model is based on the position of the present utility model in the Figure 1 Description of the trend in the state.

[0028] The utility model discloses a system for screening iron slag produced by a rotary kiln. Figure 1 As shown, it includes: a screening unit 10, which is used to screen the iron slag, so that the screened iron slag is sent to the next process, and the unscreened iron slag is sent to the steel-making converter for reuse as a coolant.

[0029] The screening unit 10 comprises: a plurality of screening rings 11, a connecting frame, and a screening net.

[0030] Multiple screening rings 11 are arranged at a predetermined distance; the connecting frame is composed of four connecting rods 12, and the four connecting rods 12 are arranged along the direction of the multiple screening rings 11 and are respectively fixedly connected to each screening ring 11. The connecting frame and the multiple screening rings 11 cooperate with each other to form a screening shell, and the screening shell is a grid-shaped cylindrical structure; the screening shell can rotate along its axis.

[0031] A plurality of sieve holes are arranged in an array on the screening net; the screening net is sleeved on the periphery of the screening shell, and the screening net is fixedly connected to the screening shell; one end of the screening shell is an inlet for iron slag to enter, and the other end of the screening shell is an outlet for iron slag that has not passed through the sieve holes to be discharged, and the screening net is used to screen the iron slag that has passed through the gap between two adjacent screening rings 11 through the sieve holes of the screening net again, and the iron slag that has passed through the sieve holes falls downward.

[0032] The screening unit 10 also includes: a rotating shell 13 and a rotating wheel; the rotating shell 13 is a cylindrical structure, the rotating shell 13 is coaxially arranged with the screening shell, and the inner end of the rotating shell 13 is fixedly connected with the outer end of the screening shell; the rotating wheel is close to the rotating shell 13 and abuts against the outer edge of the rotating shell 13, and the rotating wheel is used to rotate under the drive of the motor, and then drive the rotating shell 13 to rotate through friction, and then drive the screening shell to rotate, so that the iron slag flows out to the outlet along the axis of the screening shell in a spiral manner to complete the screening.

[0033] The utility model also includes: a first transport belt, which is located below the screening shell, and is used to receive the iron slag passing through the sieve holes and perform secondary screening on it, so as to transport the iron slag that meets the requirements of the blast furnace to the blast furnace for recycling, and return the iron slag that does not meet the requirements of the blast furnace to the batching plant to enter the sintering process.

[0034] The utility model also includes: a second transport belt, which is arranged close to the outlet of the screening shell, and is used for receiving the iron slag that has not passed through the sieve holes, and transporting it to the steelmaking converter for reuse as a coolant.

[0035] The utility model also includes: two guide plates 14 and a chute 15. The two guide plates 14 are inclined and located at both sides of the screening shell. The two guide plates 14 are used to prevent the iron slag from flying outward. The chute 15 is located below the screening shell. The upper end of the chute 15 is arranged corresponding to the lower ends of the two guide plates 14 and is fixedly connected to the lower ends of the guide plates 14. The lower end of the chute 15 is located directly above the first transport belt. The chute 15 is used to guide the iron slag.

[0036] There are multiple screening units 10, each used to screen iron slag of different particle sizes. The number of screening units can be set according to demand.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for screening iron slag produced by a rotary kiln, characterized in that: include: A screening unit (10) is used to screen the iron slag, so that the screened iron slag is sent to the next process, and the unscreened iron slag is sent to the steelmaking converter for reuse as a coolant; The screening unit (10) comprises: A plurality of screening rings (11) are arranged at predetermined intervals; A connecting frame, comprising four connecting rods (12), wherein the four connecting rods (12) are arranged along the direction of the plurality of screening rings (11) and are respectively fixedly connected to each screening ring (11), wherein the connecting frame and the plurality of screening rings (11) cooperate with each other to form a screening shell, wherein the screening shell is a grid-shaped cylindrical structure; and the screening shell can rotate along its axis; A screening net, on which a plurality of screening holes are arranged in an array; the screening net is sleeved on the periphery of the screening housing and is fixedly connected to the screening housing; One end of the screening shell is an inlet for the iron slag to enter, and the other end is an outlet for the iron slag that has not passed through the sieve hole to be discharged. The screening net is used to screen the iron slag that has passed through the gap between two adjacent screening rings (11) through the sieve holes of the screening net again, and the iron slag that has passed through the sieve holes falls downward.

2. A system for screening iron slag produced by a rotary kiln according to claim 1, characterized in that: The screening unit (10) further comprises: a rotating housing (13) and a rotating wheel; The rotating shell (13) is a cylindrical structure, coaxially arranged with the screening shell, and its inner end is fixedly connected to the outer end of the screening shell; The rotating wheel is close to the rotating shell (13) and abuts against the outer edge of the rotating shell (13). The rotating wheel is used to rotate under the drive of the motor, thereby driving the rotating shell (13) to rotate through friction, and then driving the screening shell to rotate, so that the iron slag flows out to the outlet in a spiral along the axis of the screening shell to complete the screening.

3. A system for screening iron slag produced by a rotary kiln according to claim 1, characterized in that: Also includes: The first conveyor belt is located below the screening shell and is used to receive the iron slag passing through the sieve holes and perform secondary screening on it, transporting the iron slag that meets the requirements of the blast furnace to the blast furnace for recycling, and returning the iron slag that does not meet the requirements of the blast furnace to the batching plant for the sintering process.

4. A system for screening iron slag produced by a rotary kiln according to claim 1, characterized in that: Also includes: The second conveyor belt is arranged near the outlet of the screening shell, and is used to receive the iron slag that has not passed through the sieve holes, and transport it to the steel-making converter for reuse as a coolant.

5. A system for screening iron slag produced by a rotary kiln according to claim 1, characterized in that: Also includes: Two guide plates (14) are arranged obliquely and are located on both sides of the screening shell to prevent iron slag from flying outwards; The chute (15) is located below the screening shell, with its upper end corresponding to the lower ends of the two guide plates (14) and its lower end located just above the first transport belt for guiding the iron slag.

6. A system for screening iron slag produced by a rotary kiln according to claim 1 or 2, characterized in that: The screening units (10) are provided in plurality and are respectively used for screening iron slag of different particle sizes.

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