A high-efficiency electric furnace device for reducing and separating lead and zinc polymetallic in molten slag

Abstract

This utility model discloses an electric furnace device for the efficient reduction and separation of lead and zinc polymetals in molten slag. It includes a flat-bottomed horizontal cylindrical furnace body, constructed of a steel shell lined with refractory bricks, and externally fitted with a rolling ring and a toothed ring. The furnace body is equipped with a slag inlet, slag outlet, exhaust port, feeding port, electrode holes, a lead outlet, and several spray gun nozzles. Electrodes are installed in the electrode holes using a lifting mechanism. The lead outlet is located near the slag inlet. Spray guns are installed at the spray gun nozzles, with their heads inclined and inserted into the molten slag surface. This utility model utilizes a flat-bottomed horizontal cylindrical furnace body to improve the stability of the refractory bricks and facilitate slag movement and mass transfer. The spray guns, inclined and inserted into the molten slag, inject gas to agitate the molten slag, ensuring more thorough contact between the molten slag and the reducing agent, thus accelerating the reduction rate.

Description

Technical Field

[0001] This utility model belongs to the field of non-ferrous metal metallurgy technology, specifically relating to an electric furnace device for efficient reduction and separation of lead, zinc and polymetallic substances in molten slag. Background Technology

[0002] Traditional electric furnaces for reducing lead and zinc typically employ vertical cylindrical or horizontal rectangular furnace structures. The presence of intersecting edges and corners within the furnace causes significant resistance to the movement of the molten material. Furthermore, refractory bricks are prone to expansion at operating temperatures above 1000℃, leading to instability in the overall refractory brick structure and its outer shell, and even serious consequences such as the collapse of the refractory brick walls. Utility Model Content

[0003] This utility model provides an electric furnace device for the efficient reduction and separation of lead and zinc polymetals in molten slag. By adopting a horizontal cylindrical furnace body with a flat bottom and setting up spray guns, the furnace body structure is stabilized, which is conducive to the movement and mass transfer of molten slag and the reduction is highly efficient, thereby solving the shortcomings described in the prior art.

[0004] The technical solution adopted in this utility model is as follows:

[0005] An electric furnace device for efficient reduction and separation of lead-zinc polymetallics in molten slag includes a furnace body, which is a horizontal cylindrical furnace body. The inner cavity of the furnace body is a circular cavity with a flat bottom at the center. The cylindrical furnace body improves the stability of the refractory bricks, making them less prone to collapse, and the flat bottom structure facilitates molten slag flow. It also makes it easy to adjust the electrode insertion depth, preventing the electrodes from burning the furnace wall. A slag inlet is provided at the front wall of the furnace body, and a slag outlet and an exhaust outlet are provided at the rear wall of the furnace body. The exhaust outlet is located above the slag outlet and mainly discharges a mixture of reducing gas CO and zinc vapor.

[0006] The top of the furnace body is equipped with a feeding port and electrode holes along its length, and each electrode hole can be installed with an electrode in a lifting manner;

[0007] The outer circumferential wall of the furnace body is provided with a lead outlet and several spray gun nozzles along the length direction. The lead outlet and spray gun nozzles are located at the lower part of the furnace body. The lead outlet is close to the slag inlet. A spray gun is installed at the spray gun nozzle, and the head of the spray gun is inserted at an angle into the molten slag surface.

[0008] In a preferred embodiment of this utility model, the slag inlet is a siphon slag inlet; the slag outlet is a siphon slag outlet; and the lead outlet is a siphon lead outlet.

[0009] In a preferred embodiment of this invention, the tip of the electrode is inserted below the surface of the molten slag inside the furnace cavity. Different temperature ranges can be controlled using the electrode according to the boiling point of the metal to be reduced, thus minimizing unnecessary energy consumption.

[0010] In a preferred embodiment of this invention, the feeding port includes a granular reducing agent feeding port and a flux feeding port. The feeding port facilitates the uniform and rapid addition of the reducing agent and its reaction with the metal oxide to reduce the metal.

[0011] As a preferred embodiment of this invention, a cooling structure is provided at the slag inlet on the front wall of the furnace body. The entire furnace body is constructed using refractory bricks. Due to the limited application scenarios of refractory bricks, they need to be cooled to prevent them from expanding, damaging the furnace body, and causing it to collapse, thereby improving the service life of the furnace body.

[0012] As a preferred embodiment of this utility model, the cooling structure is a copper water jacket.

[0013] As a preferred embodiment of this utility model, a temperature detection hole and a gas pressure detection hole are provided on the top of the furnace body.

[0014] In a preferred embodiment of this invention, an inert gas, a reducing gas, or a gas carrying a powdered reducing agent is introduced into the spray gun. The spray gun is tilted upwards and inserted into the molten slag to stir the molten slag, increase the contact area between the molten slag and the reducing agent, and improve the reduction efficiency. The reduced lead liquid is below the molten slag, and the head of the spray gun is above the lead liquid.

[0015] As a preferred embodiment of this utility model, a rolling ring and a toothed ring are provided on the outer circumferential wall of the furnace body; the rolling ring and toothed ring structure can rotate the entire furnace body, and the rotation is only used when maintenance is required.

[0016] This invention employs a horizontal cylindrical furnace body with a flat-bottomed inner cavity to improve the furnace's compressive strength and facilitate slag movement and mass transfer. Gas is injected into the molten slag through an inclined nozzle, which agitates the molten slag, ensuring more thorough contact between the molten slag and the reducing agent and accelerating the reduction rate. Furthermore, by controlling different electrode temperature ranges according to the metal's boiling point, unnecessary energy consumption is reduced. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a top view of the present invention.

[0019] Figure 2 This is a front sectional view of the present invention.

[0020] Figure 3for Figure 2 BB-direction sectional view. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0022] An electric furnace device for the efficient reduction and separation of lead-zinc polymetallic materials from molten slag, such as... Figure 1 , 2 As shown in Figure 3, the furnace body 1 is a horizontal cylindrical furnace body. The entire furnace body is composed of a steel shell and refractory bricks. The steel shell is filled with refractory bricks. The inner cavity of the furnace body 1 is a circular cavity with a flat bottom. The cylindrical furnace body improves the stability of the refractory bricks, making them less prone to collapse, and the flat bottom structure also facilitates the flow of molten slag.

[0023] A slag inlet 2 is provided at the front wall of the furnace body 1. The slag inlet 2 is a siphon slag inlet.

[0024] To further improve the stability of the furnace body and extend its service life, a cooling structure is installed on the front wall of the furnace body at the slag inlet 2. In this embodiment, a copper water jacket 11 is used to cool the refractory bricks at the slag inlet.

[0025] A slag outlet 3 and an exhaust outlet 4 are provided at the rear end wall of the furnace body 1. The exhaust outlet 4 is located above the slag outlet 3 and mainly discharges a mixture of reducing gas CO and zinc vapor. The slag outlet 3 is a siphon slag outlet.

[0026] The top of the furnace body 1 is provided with a feeding port 5 and an electrode hole 6 along its length. There are multiple feeding ports 5 along the length, including granular reducing agent feeding ports and flux feeding ports. The feeding ports have the same structure and are distinguished only by the different substances added. The feeding ports facilitate the uniform and rapid addition of the reducing agent and its reaction with the metal oxide to reduce the metal.

[0027] Each electrode hole 6 is equipped with an electrode 10 that can be lifted and lowered. The lifting and lowering installation can be achieved by using a lifting device in the prior art, which is not shown in this embodiment. However, a clamping structure is provided on the electrode 10 above the copper clip 12. The clamping structure is used to connect with the lifting device. During operation, the position of the electrode is adjusted by using the lifting device so that the head of the electrode 10 is inserted into the molten slag surface 13. The specific insertion depth is adjusted according to the actual situation.

[0028] Electrode 10 is connected to an external power source via copper clip 12. The external power source supplies power to the electrode through the copper clip to make it heat up.

[0029] Because lead and zinc have different boiling points, electrodes can be used to control different temperature ranges based on the required reduction temperature and the difference in metal boiling points, thereby reducing unnecessary energy consumption.

[0030] A lead outlet 7 and several spray gun nozzles 8 are provided along the length of the outer circumferential wall of the furnace body 1. The lead outlet 7 and the spray gun nozzles 8 are located at the lower part of the furnace body. The lead outlet 7 is close to the slag inlet 2. The lead outlet 7 is a siphon lead outlet to discharge the reduced lead liquid.

[0031] The nozzle 8 is inclined from bottom to top, where "bottom" refers to the bottom of the furnace body. Each nozzle 8 is equipped with a nozzle 9, into which an inert gas, reducing gas, or gas carrying a powdered reducing agent is introduced. In this embodiment, CO is introduced as the reducing gas. The nozzle is inserted into the molten slag at an upward angle, stirring the molten slag and increasing the contact area between the molten slag and the reducing agent, thereby improving the reduction efficiency. The reduced lead liquid is below the molten slag, and the nozzle head is above the lead liquid.

[0032] Temperature detection holes and air pressure detection holes can also be provided on the top of the furnace body 1 according to functional requirements.

[0033] The molten slag from upstream enters the furnace through the slag inlet. Under the action of the reducing agent and the action of the electrodes and the spray gun, the reducing agent reacts with the lead oxide in the molten slag 13, and the lead is reduced. Since the boiling point of lead is high, it will be deposited at the bottom of the furnace in the form of lead liquid 14. That is, lead liquid 14 is at the bottom of molten slag 13. During the falling process, the lead liquid continuously captures gold and silver precious metals in the molten slag and is finally released from the lead outlet 7.

[0034] The lead in the slag is reduced to liquid lead. The lead-free slag is then reduced by a reducing agent. However, since zinc has a boiling point of only 907°C, the reduced zinc is discharged from exhaust port 4 as zinc-containing fumes. Excess reducing gas CO is also discharged from the exhaust port. The reduced slag is discharged from the slag outlet.

[0035] To facilitate maintenance, a rolling ring 15 and a toothed ring 16 are installed on the outer circumferential wall of the furnace body; the structure of the rolling ring 15 and the toothed ring 16 can rotate the entire furnace body, and the rotation is only used when maintenance is required.

[0036] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency electric furnace device for reducing and separating lead-zinc polymetallic in molten slag, comprising a furnace body (1), characterized in that: The furnace body (1) is a horizontal cylindrical furnace body; the inner cavity of the furnace body (1) is a circular cavity, and the bottom of the central cavity is flat; a slag inlet (2) is provided at the front wall of the furnace body (1), and a slag outlet (3) and an exhaust outlet (4) are provided at the rear wall of the furnace body (1), with the exhaust outlet (4) located above the slag outlet (3); The top of the furnace body (1) is provided with a feeding port (5) and an electrode hole (6) along the length direction. Each electrode hole (6) can be equipped with an electrode (10) in a liftable manner. A lead outlet (7) and several spray gun nozzles (8) are provided along the length of the outer circumferential wall of the furnace body (1). The lead outlet (7) and the spray gun nozzles (8) are located at the lower part of the furnace body. The lead outlet (7) is close to the slag inlet (2). A spray gun (9) is installed at the spray gun nozzle (8). The head of the spray gun (9) is inserted into the molten slag surface at an angle.

2. The electric furnace device for efficiently reducing and separating lead and zinc polymetallic in molten slag according to claim 1, characterized in that: The slag inlet (2) is a siphon slag inlet; the slag outlet (3) is a siphon slag outlet; and the lead outlet (7) is a siphon lead outlet.

3. The electric furnace device for efficiently reducing and separating lead and zinc polymetallic in molten slag according to claim 1 or 2, characterized in that: The head of the electrode (10) is inserted below the molten slag surface inside the furnace cavity.

4. The electric furnace device for efficiently reducing and separating lead and zinc polymetallic in molten slag according to claim 1 or 2, characterized in that: The feeding ports include a granular reducing agent feeding port and a flux feeding port.

5. The electric furnace device for efficiently reducing and separating lead and zinc polymetallic in molten slag according to claim 1 or 2, characterized in that: A cooling structure is provided on the front wall of the furnace body at the slag inlet (2).

6. The electric furnace device for efficiently reducing and separating lead and zinc polymetallic in molten slag according to claim 5, characterized in that: The cooling structure is a copper water jacket (11).

7. The electric furnace device for efficiently reducing and separating lead and zinc polymetallic in molten slag according to claim 1 or 2, characterized in that: Temperature detection holes and air pressure detection holes are provided on the top of the furnace body (1).

8. The electric furnace device for efficiently reducing and separating lead and zinc polymetallic in molten slag according to claim 1 or 2, characterized in that: An inert gas, a reducing gas, or a gas carrying a powder reducing agent is introduced into the spray gun (9).

9. The electric furnace device for efficiently reducing and separating lead and zinc polymetallic in molten slag according to claim 1 or 2, characterized in that: A rolling ring (15) and a toothed ring (16) are provided on the outer circumferential wall of the furnace body (1).

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