Reducing the frozen layer system of a depletion furnace

Abstract

The utility model provides a kind of reduce the frozen layer system of depletion electric furnace, including material bin and converter, the material bin includes lump coal bin, quartz bin, massive vulcanizing agent bin, drying excess material bin and vulcanizing agent receiving bin, material in the material bin is mixed with converter slag in converter after being passed into depletion electric furnace, the depletion electric furnace is communicated with dust collector, the dust in the dust collector is passed into wind root scale, molten metal in the depletion electric furnace is passed into converter.The utility model has completed the function of strengthening vulcanization, reduction depletion and sedimentation separation in depletion electric furnace, reduced frozen layer height, saved production cost, ensured furnace body operation safety, improved discharge operation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of non-ferrous metallurgical technology and relates to a system for reducing the freezing layer of a depleted electric furnace. Background Technology

[0002] Currently, there is a problem of unstable control of the frozen layer in the nickel pyrometallurgical process. This can cause the frozen layer to rise rapidly in a short period of time, reducing the effective volume of the furnace and making it difficult to discharge materials from the furnace. A large amount of high-melting-point refractory materials are deposited in the frozen layer at the bottom of the furnace, causing the furnace to shut down. This makes maintenance difficult and time-consuming. Therefore, it is necessary to control the height of the frozen layer to ensure the stable operation of the metallurgical furnace. Utility Model Content

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a system for reducing the freezing layer of a lean electric furnace. This system solves the problems of unstable control of the freezing layer in lean electric furnaces, the deposition of a large amount of high-melting-point refractory materials in the freezing layer at the bottom of the furnace, which causes furnace deadness and affects the stable operation of metallurgical furnaces.

[0004] Therefore, the present invention adopts the following technical solution: A system for reducing the freezing layer of a lean electric arc furnace includes a material silo and a converter. The material silo includes a lump coal silo, a quartz silo, a lump sulfiding agent silo, a drying residue silo, and a sulfiding agent receiving silo. The material in the material silo is mixed with the converter slag in the converter and then fed into the lean electric arc furnace. The lean electric arc furnace is connected to a dust collector. The flue dust in the dust collector is fed into the air duct. The molten metal in the lean electric arc furnace is fed into the converter.

[0005] The coal bunker, quartz bunker, block vulcanizing agent bunker, and drying residue bunker are all equipped with belt scales; the vulcanizing agent receiving bunker is equipped with a screw scale.

[0006] The converter is a PS converter; the dust collector is a metal bag dust collector.

[0007] The beneficial effects of this utility model are as follows: This invention achieves enhanced sulfidation, reduction and depletion, and sedimentation separation in a depletion electric furnace, reducing the height of the frozen layer, saving production costs, ensuring safe furnace operation, and improving emission operation efficiency. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the system structure of this utility model.

[0009] In the diagram, 1-material bin, 11-lump coal bin, 12-quartz bin, 13-lump vulcanizing agent bin, 14-drying residue bin, 15-vulcanizing agent receiving bin, 2-converter, 3-lean electric furnace, 4-dust collector, 5-air root scale. Detailed Implementation

[0010] The technical solution of this utility model will be described below with reference to the accompanying drawings and implementation methods.

[0011] like Figure 1 As shown, a system for reducing the freezing layer of an electric arc furnace includes a material bin 1 and a converter 2; specifically, the converter 2 is a PS converter.

[0012] Material bin 1 includes a lump coal bin 11, a quartz bin 12, a lump sulfiding agent bin 13, a drying residue bin 14, and a sulfiding agent receiving bin 15. The material in material bin 1 is mixed with the converter slag in converter 2 and then fed into the lean electric furnace 3. The lean electric furnace 3 is connected to the dust collector 4, which is a metal bag dust collector. The flue dust in the dust collector 4 is fed into the air filter 5, and the molten metal in the lean electric furnace 3 is fed into converter 2.

[0013] In addition, the coal bunker 11, quartz bunker 12, block vulcanizing agent bunker 13, and drying residue bunker 14 are all equipped with belt scales; the vulcanizing agent receiving bunker 15 is equipped with a screw scale.

[0014] The usage process of this utility model is as follows: Converter slag, sulfiding agent, reducing agent, quartz, and high-sulfur concentrate are mixed in a set ratio to obtain a mixture that meets the process requirements; then the resulting mixture is added into the lean electric furnace 3. The melt surface height is controlled at 1400mm to 2000mm, the slag temperature of the depleted electric furnace 3 is controlled at 1200℃ to 1350℃, the nickel matte temperature is controlled at 1000℃ to 1200℃, and the low-nickel matte grade is controlled at 20% to 40%. By mixing and adding materials in different proportions, the sulfiding agent, reducing agent and smelting slag / blowing slag are fully mixed to complete the physicochemical reaction. Hot sulfurizing agent is returned to the depletion electric furnace, and slag from the later stage of converter blowing is returned simultaneously. After the reduction and separation of smelting slag and metal are completed, the depleted slag is discharged from the furnace through the slag outlet and water-quenched. The depleted low-nickel matte is sent to the converter for secondary blowing to obtain high-nickel matte rich in valuable metals.

Claims

1. A system for reducing the freezing layer of a lean electric furnace, characterized in that, The system includes a material silo (1) and a converter (2). The material silo (1) includes a lump coal silo (11), a quartz silo (12), a lump sulfiding agent silo (13), a dry residue silo (14), and a sulfiding agent receiving silo (15). The material in the material silo (1) is mixed with the converter slag in the converter (2) and then fed into a lean electric furnace (3). The lean electric furnace (3) is connected to a dust collector (4). The flue dust in the dust collector (4) is fed into a blower (5). The molten metal in the lean electric furnace (3) is fed into the converter (2).

2. A reduced depletion electric furnace freeze layer system according to claim 1, wherein, The coal bunker (11), quartz bunker (12), block vulcanizing agent bunker (13), and dry residue bunker (14) are all equipped with belt scales; the vulcanizing agent receiving bunker (15) is equipped with a screw scale.

3. A reduced depletion electric furnace freeze layer system as defined in claim 1, wherein, The converter (2) is a PS converter.

4. A reduced depletion electric furnace freeze layer system as defined in claim 1, wherein, The dust collector (4) is a metal bag dust collector.

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