Method for smelting with oxygen-enriched side-blown furnace and electrically heating front bed oven

Abstract

The application provides a method for baking a furnace by using an oxygen-rich side-blown smelting furnace and an electric heating front bed, and comprises the following steps: a baking preparation stage, an electric heating front bed low-temperature baking stage, an electric heating front bed medium-temperature baking and oxygen-rich side-blown furnace low-temperature baking stage, an electric heating front bed high-temperature baking and oxygen-rich side-blown furnace medium-temperature baking stage, an electric heating front bed heat preservation baking and oxygen-rich side-blown furnace medium-temperature baking stage, and a baking end stage. Different methods are adopted in different heating stages, the heating curve of the whole baking process presents linearization characteristics, each part of the furnace is uniformly heated, the problem that the temperature in the furnace is not easy to accurately control in the prior art and thus the baking effect is affected is solved, and the beneficial effect of improving the baking quality is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of non-ferrous metallurgical furnace starting, in particular to a method for starting an oxygen-enriched side-blown smelting furnace and an electrically-heated forehearth. BACKGROUND

[0002] The oxygen-enriched side-blown furnace is an energy-saving and efficient smelting furnace, which has been widely used in copper, nickel, lead and tin smelting. It has the advantages of small gas consumption, small floor area, strong adaptability to raw materials, less waste gas emission, and high metal recovery rate. The electrically-heated forehearth is a smelting equipment that converts electric energy into heat energy by inserting an electrode into a liquid molten body and relying on the double action of micro-arc formed on the interface between the electrode and the molten slag and the heat generated by the molten body resistance. It is usually used to heat the slag and reduce the metal content in the slag, and belongs to a type of electric arc furnace.

[0003] For newly built oxygen-enriched side-blown furnaces and electrically-heated forehearths, the construction method and internal structure of the furnace body will cause the furnace body to contain a lot of moisture. If the furnace is directly ignited, the moisture in the furnace will rapidly evaporate, causing the refractory to powder and crack, the furnace body to expand and crack, and the furnace hearth to be damaged. Therefore, the furnace drying is an important link before starting the furnace. The furnace drying can ensure that the furnace body is not damaged while fully sintering the refractory, eliminating the stress caused by thermal expansion, and prolonging the service life of the refractory.

[0004] At present, most of the domestic furnaces are directly dried by wood, coke or natural gas. Such furnace drying methods generally have the following problems: 1. The furnace temperature is not easy to control, and thermal stress is easy to occur, causing the refractory in the furnace to burn; 2. The heating of each part in the furnace is uneven, resulting in poor drying effect; 3. The drying time is too long, which affects the normal production of the furnace and increases the cost of drying; 4. The water vapor and smoke gas generated during the drying process cannot be discharged in time, resulting in a poor production site environment and damaging the instruments and meters on the furnace top; 5. The progress of each industrial furnace is difficult to control and keep consistent, etc. In view of the above-mentioned related technologies, the oxygen-enriched side-blown smelting furnace and the electrically-heated forehearth drying method are improved. SUMMARY

[0005] In view of the deficiencies in the prior art, the present application provides a method for drying an oxygen-enriched side-blown smelting furnace and an electrically-heated forehearth, which solves the problem of poor control of the furnace temperature in the prior art, thereby affecting the drying effect.

[0006] According to the technical scheme of the present application, a method for drying an oxygen-enriched side-blown smelting furnace and an electrically-heated forehearth includes the following steps:

[0007] (1) Preparation stage before drying the furnace: Put the oxygen-enriched side-blown furnace and the electrically-heated forehearth into the copper port, the slag port and the empty port, block the inner side hole with 1 / 3 coke powder and 2 / 3 clay powder, block the outer side hole with mud cannon, and lay a layer of slag-making material layer in the electrically-heated forehearth;

[0008] (2) The low-temperature baking stage of the electric heating forehearth: a gas heating furnace is installed on the platform above the electric heating forehearth, the gas heating furnace is controlled to continuously blow heating gas into the electric heating forehearth, and the electric heating forehearth is baked at low temperature according to the temperature range and time of the refractory material of the electric heating forehearth;

[0009] (3) The medium-temperature baking stage of the electric heating forehearth and the low-temperature baking stage of the oxygen-enriched side-blown furnace: wood layers are laid in the electric heating forehearth, the wood layers are ignited and baked with small fire, the electric heating forehearth is baked at medium temperature according to the temperature range and time of the refractory material of the electric heating forehearth, meanwhile, the gas heating furnace on the platform above the electric heating forehearth is lifted to the platform above the oxygen-enriched side-blown furnace by the travelling crane, the gas heating furnace is controlled to continuously blow heating gas into the oxygen-enriched side-blown furnace, and the oxygen-enriched side-blown furnace is baked at low temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace;

[0010] (4) The high-temperature baking stage of the electric heating forehearth and the medium-temperature baking stage of the oxygen-enriched side-blown furnace: coke layers are laid in the electric heating forehearth, the coke layers are ignited, the electric heating forehearth is baked at high temperature according to the temperature range and time of the refractory material of the electric heating forehearth, meanwhile, wood layers are laid in the oxygen-enriched side-blown furnace, the wood layers are ignited and baked with small fire, and the oxygen-enriched side-blown furnace is baked at medium temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace;

[0011] (5) The slagging and heat preservation stage of the electric heating forehearth and the high-temperature baking stage of the oxygen-enriched side-blown furnace: slagging material layers are laid in the electric heating forehearth, the electrode lowering system of the electric heating forehearth is controlled to lower the electrodes to ignite the slagging material layers, the electric heating forehearth is slagged and heat preserved, meanwhile, coke layers are laid in the oxygen-enriched side-blown furnace, the coke layers are ignited, and the oxygen-enriched side-blown furnace is baked at high temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace;

[0012] (6) The end stage of baking: after the temperature of the oxygen-enriched side-blown smelting furnace and the electric heating forehearth is raised to the end, the materials can be put in and the furnace can be started.

[0013] The technical principle of the present application is that different methods are used to realize the baking operation of the oxygen-enriched side-blown furnace and the electric heating forehearth at different temperatures in the furnace according to the temperature range and time of the refractory material, so as to ensure that each part of the furnace is uniformly heated, has good baking effect, reduces the cost of baking, and the water vapor and flue gas discharged during the baking process are treated, and at the same time, the oxygen-enriched side-blown smelting furnace and the electric heating forehearth reach the temperature range that can be put into production, so as to solve the problem that the temperature in the furnace is not easy to control in the prior art, thereby affecting the baking effect.

[0014] Compared with the prior art, the present application has the following beneficial effects: 1. The present application uses the heating gas generated by the gas heating furnace to perform low-temperature baking on the electric heating forehearth and the oxygen-enriched side-blown furnace. This method can make most of the water in the masonry slowly evaporate, avoid the pulverization and cracking of the refractory material, the expansion and cracking of the furnace body, and the damage of the furnace hearth caused by the rapid evaporation of water; 2. Different methods are used in different heating stages, and the heating curve of the whole baking process is linear, so that each part of the furnace is uniformly heated, the refractory material is prevented from being cracked due to excessive stress, the ability of the refractory material to resist high-temperature fluid erosion and corrosion is enhanced, and the service life of the refractory material is greatly improved; 3. The electric heating forehearth and the oxygen-enriched side-blown furnace are staggered to bake, so that the temperature range for feeding and production can be reached at the same time, the baking time is shortened, and the baking cost is reduced; 4. The water vapor and flue gas generated in the baking process are uniformly introduced into the rear-end flue gas treatment system, so that the production environment is guaranteed, and the instruments and meters on the furnace top are also protected from damage caused by flue gas erosion. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The present application is a baking method for an oxygen-enriched side-blown smelting furnace and an electric heating forehearth.

[0016] Figure 2 The present application is a baking temperature rising curve for a baking method for an oxygen-enriched side-blown smelting furnace and an electric heating forehearth.

[0017] Figure 3 The present application is a schematic diagram of a gas heating furnace and its connecting pipeline.

[0018] Figure 4 The present application is a comparison diagram of the effects of low-temperature baking of a gas heating furnace and low-temperature baking of electric resistance wires. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0020] The technical solutions in the present application will be further described below in combination with the drawings and examples.

[0021] As shown in the drawings, Figure 1 The present application proposes a baking method for an oxygen-enriched side-blown smelting furnace and an electric heating forehearth, which includes the following steps:

[0022] (1) Preparation stage before baking: the oxygen-enriched side-blown furnace and the electric heating forehearth are placed at the copper outlet, the slag outlet and the emptying outlet, the inside holes are blocked with 1 / 3 coke powder and 2 / 3 clay powder, the outside holes are blocked with mud cannons, and a layer of slag-making material is laid in the electric heating forehearth;

[0023] (2) The low-temperature baking stage of the electric heating forehearth: a gas heating furnace is installed on the platform above the electric heating forehearth, the gas heating furnace is controlled to continuously blow heating gas into the electric heating forehearth, and the electric heating forehearth is baked at low temperature according to the temperature range and time of the refractory material of the electric heating forehearth;

[0024] (3) The medium-temperature baking stage of the electric heating forehearth and the low-temperature baking stage of the oxygen-enriched side-blown furnace: woodchips are laid in the electric heating forehearth, the woodchips are ignited and baked at a small fire, the electric heating forehearth is baked at medium temperature according to the temperature range and time of the refractory material of the electric heating forehearth, meanwhile, the gas heating furnace on the platform above the electric heating forehearth is lifted to the platform above the oxygen-enriched side-blown furnace by a travelling crane, the gas heating furnace is controlled to continuously blow heating gas into the oxygen-enriched side-blown furnace, and the oxygen-enriched side-blown furnace is baked at low temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace;

[0025] (4) The high-temperature baking stage of the electric heating forehearth and the medium-temperature baking stage of the oxygen-enriched side-blown furnace: coke is laid in the electric heating forehearth, the coke is ignited, the electric heating forehearth is baked at high temperature according to the temperature range and time of the refractory material of the electric heating forehearth, meanwhile, woodchips are laid in the oxygen-enriched side-blown furnace, the woodchips are ignited and baked at a small fire, and the oxygen-enriched side-blown furnace is baked at medium temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace;

[0026] (5) The slagging and heat-insulating stage of the electric heating forehearth and the high-temperature baking stage of the oxygen-enriched side-blown furnace: slagging material is laid in the electric heating forehearth, the electrode lowering system of the electric heating forehearth is controlled to lower the electrode to ignite the slagging material, the electric heating forehearth is slagged and heat-insulated, meanwhile, coke is laid in the oxygen-enriched side-blown furnace, the coke is ignited, and the oxygen-enriched side-blown furnace is baked at high temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace;

[0027] (6) The end stage of baking: after the temperature of the oxygen-enriched side-blown furnace and the electric heating forehearth is raised to the end, the furnace can be started up by charging.

[0028] Specific operation process: Step one: the preparation stage before baking, the oxygen-enriched side-blown furnace and the electric heating forehearth are prepared by closing the copper port, the slagging port and the emptying port, 1 / 3 coke powder and 2 / 3 clay powder are used to block the inner holes, and mud cannons are used to block the outer holes, a layer of slagging bottom material is laid in the electric heating forehearth, the composition of the slagging bottom material is as follows: an 8-10mm steel plate is welded into a rectangular frame, which is placed in the center of the electrode, a 30mm thick graphite conductive layer is tamped on the bottom layer in the frame, copper-clad iron fragments are laid on the upper part of the graphite conductive layer, and copper matte blocks and water-quenched slag are filled outside the frame with a thickness of about 80-100mm.

[0029] Step two: the low-temperature baking stage of the electric heating forehearth, a gas heating furnace is installed on the platform above the electric heating forehearth, the gas heating furnace is controlled to continuously blow heating gas into the electric heating forehearth, and the electric heating forehearth is baked at low temperature according to the temperature range and time of the refractory material of the electric heating forehearth, the low-temperature baking stage of the electric heating forehearth lasts for about 60h, and the temperature is controlled at 200-250℃.

[0030] Step three: the medium temperature baking stage of the electric heating forehearth and the low temperature baking stage of the oxygen-enriched side-blown furnace, wood layers are laid in the electric heating forehearth, the wood layers are ignited, the electric heating forehearth is baked at a medium temperature according to the temperature range and time of the refractory material of the electric heating forehearth, the thickness of the wood layers in the electric heating forehearth is 60-80mm, the medium temperature baking stage of the electric heating forehearth lasts for about 48h, and the temperature is controlled to be 450-600℃. At the same time, the gas heating furnace above the platform of the electric heating forehearth is hoisted to above the platform of the oxygen-enriched side-blown furnace by the travelling crane, the gas heating furnace is controlled to continuously blow heating gas into the oxygen-enriched side-blown furnace, the oxygen-enriched side-blown furnace is baked at a low temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace, the low temperature baking stage of the oxygen-enriched side-blown furnace lasts for about 72h, and the temperature is controlled to be 250-300℃.

[0031] Step four: the high temperature baking stage of the electric heating forehearth and the medium temperature baking stage of the oxygen-enriched side-blown furnace, coke layers are laid in the electric heating forehearth, the coke layers are ignited, the electric heating forehearth is baked at a high temperature according to the temperature range and time of the refractory material of the electric heating forehearth, the thickness of the coke layers in the electric heating forehearth is 50-60mm, the high temperature baking stage of the electric heating forehearth lasts for about 48h, and the temperature is controlled to be 850-950℃. At the same time, wood layers are laid in the oxygen-enriched side-blown furnace, the wood layers are ignited, the oxygen-enriched side-blown furnace is baked at a medium temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace, the thickness of the wood layers in the oxygen-enriched side-blown furnace is 50-70mm, and the medium temperature baking stage of the oxygen-enriched side-blown furnace lasts for about 48h, and the temperature is controlled to be 400-550℃.

[0032] Step five: the slagging and heat preservation stage of the electric heating forehearth and the high temperature baking stage of the oxygen-enriched side-blown furnace, slagging material layers are laid in the electric heating forehearth, the electrode lifting system of the electric heating forehearth is controlled to lower the electrodes to ignite the slagging material layers, the electric heating forehearth is slagged and heat preserved, the thickness of the slagging layers in the electric heating forehearth is 80-100mm, the slagging and heat preservation stage of the electric heating forehearth lasts for about 60h, and the temperature is controlled to be 1000-1100℃. At the same time, coke layers are laid in the oxygen-enriched side-blown furnace, the coke layers are ignited, the oxygen-enriched side-blown furnace is baked at a high temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace, the thickness of the coke layers in the oxygen-enriched side-blown furnace is 40-50mm, the high temperature baking stage of the oxygen-enriched side-blown furnace lasts for about 36h, and the temperature is controlled to be 800-900℃.

[0033] Step six: the end stage of baking, after the temperature rising of the oxygen-enriched side-blown furnace and the electric heating forehearth is completed, the materials can be put in and the furnace can be started.

[0034] As Figure 1As shown, in a preferred embodiment of the present invention, in the pre-furnace preparation stage, the interior of the electric heating front bed is made of a rectangular frame welded with 8-10mm steel plate and placed in the center of the electrode. Inside the frame, a graphite conductive layer of about 30mm thickness is tamped at the bottom. Copper-clad iron fragments are laid on the top of the graphite conductive layer. Copper matte blocks and water-quenched slag are filled outside the frame, with a thickness of about 80-100mm.

[0035] like Figure 1 As shown, in a preferred embodiment of the present invention, during the low-temperature baking stage of the electric heating forecourt, the gas outlet pipe of the gas heating furnace is connected to a four-way pipe via a flange. This low-temperature baking stage lasts approximately 60 hours, with the temperature controlled at 200-250°C. In this embodiment, connecting the outlet pipe to a four-way pipe via a flange ensures that the heating furnace introduces the heating gas into the electric heating forecourt through three pipes, thereby completing the 60-hour low-temperature baking stage.

[0036] like Figure 1 As shown, in a preferred embodiment of the present invention, the thickness of the firewood layer in the electric heating forecourt during the medium-temperature drying stage and the low-temperature drying stage of the oxygen-enriched side-blown furnace is 60-80 mm. The medium-temperature drying stage of the electric heating forecourt lasts for approximately 48 hours, with a controlled temperature of 450-600℃. The low-temperature drying stage of the oxygen-enriched side-blown furnace lasts for approximately 72 hours, with a controlled temperature of 250-300℃. In this embodiment, firewood is laid in the electric heating forecourt, and the firewood combustion heats the electric heating forecourt. Simultaneously, heating gas is continuously blown into the oxygen-enriched side-blown furnace through a gas heating furnace. Furthermore, the temperature control is ensured by utilizing the temperature rise curves of the refractory materials in the electric heating forecourt and the oxygen-enriched side-blown furnace.

[0037] like Figure 1 As shown, in a preferred embodiment of the present invention, the coke layer thickness in the electric heating front bed high-temperature drying furnace and the oxygen-enriched side-blown furnace medium-temperature drying stage is 50-60 mm. The electric heating front bed high-temperature drying stage lasts approximately 48 hours, with a controlled temperature of 850-950℃. The firewood layer thickness in the oxygen-enriched side-blown furnace is 50-70 mm. The oxygen-enriched side-blown furnace medium-temperature drying stage lasts approximately 48 hours, with a controlled temperature of 400-550℃. In this embodiment, the electric heating front bed high-temperature drying furnace uses a coke layer with a higher combustion temperature, while the oxygen-enriched side-blown furnace has an internal firewood layer, further increasing the temperature while simultaneously measuring the temperature rise curve of the refractory material.

[0038] like Figure 1As shown, as a preferred technical solution of the present application, the slagging layer thickness in the electric heating front bed in the high-temperature baking stage of the electric heating front bed slagging and heat preservation and the oxygen-enriched side-blown furnace is 80-100 mm, the electric heating front bed slagging and heat preservation stage lasts for about 60 h, the temperature is controlled at 1000-1100 ℃, the coke layer thickness in the oxygen-enriched side-blown furnace is 40-50 mm, and the high-temperature baking stage of the oxygen-enriched side-blown furnace lasts for about 36 h, and the temperature is controlled at 800-900 ℃. In this scheme, the slagging material layer used for high-temperature baking of the electric heating front bed has a higher temperature during combustion, and the oxygen-enriched side-blown furnace is internally laid with a coke layer to further increase the temperature and measure the temperature rising curve of the refractory.

[0039] As shown in Figure 1 As a preferred technical solution of the present application, the water vapor and flue gas generated in the baking process of the electric heating front bed and the oxygen-enriched side-blown furnace are introduced into the rear flue gas treatment process system through a smoke pipe by using the same 50kw ring collector fan. In this scheme, the same 50kw ring collector fan is used to control variables and reduce the influence on the final result caused by other reasons.

[0040] Comparative Example 1

[0041] Low-temperature baking was carried out according to the method in patent document 202111358745.1:

[0042] S1, laying the furnace bottom material: to protect the furnace bottom and prevent the molten bath from penetrating into the brick joint when the side-blown furnace is just charged, <1 mm thin iron sheet is laid on the furnace bottom, then water-quenched slag is brought into the side-blown furnace through the charging belt, and the water-quenched slag is uniformly laid on the steel plate with a thickness of about 200 mm (water content <1%), and the thickness at the corners reaches 230 mm;

[0043] S2, laying the resistance wire: light clay bricks are placed on the water-quenched slag on the furnace bottom as resistance wire fixing and supporting devices; the low-temperature baking stage includes the following steps:

[0044] S3, slowing down the temperature rising rate in the early baking stage;

[0045] S4, when the water removal is more in a certain stage of temperature rising, the temperature rising is temporarily stopped or the holding time is prolonged;

[0046] S5, after the low-temperature baking is completed, the resistance wire power supply is disconnected, and the resistance wire is removed from the furnace.

[0047] The low-temperature baking carried out in the above examples was subjected to a number of comparative experiments, and the comparison results are shown in Figure 4

[0048] ​It can be seen from the example 2 and the comparative example 1 that the low-temperature baking method using the gas heating furnace in the application has the advantages of low cost, high operation rate and long operation time, and even the daily processing capacity and yield are improved compared with the prior art.

[0049] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the application and are not limiting. Although the application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the application, and they should be covered in the scope of the claims of the application.

Claims

1. A method for baking a furnace using an oxygen-enriched side-blown smelting furnace and an electrically heated forecourt, characterized in that, Includes the following steps: (1) Preparation stage before furnace drying: Seal the copper outlet, slag outlet and air outlet of the oxygen-enriched side-blown furnace and the electric heating front bed with 1 / 3 coke powder and 2 / 3 clay powder to block the inner hole, and seal the outer hole with mud gun. Lay a layer of slag-making bottom material in the electric heating front bed. (2) Low-temperature baking stage of electric heating front bed: A gas heating furnace is installed on the platform above the electric heating front bed. The gas heating furnace is controlled to continuously blow heating gas into the electric heating front bed. The electric heating front bed is baked at low temperature according to the temperature range and time of the refractory material of the electric heating front bed. (3) Medium-temperature baking stage of electric heating front bed and low-temperature baking stage of oxygen-enriched side-blown furnace: lay a layer of firewood in the electric heating front bed, ignite the firewood layer, bake with a small fire, and bake the electric heating front bed at a medium temperature according to the temperature range and time of the refractory material of the electric heating front bed. At the same time, use a crane to lift the gas heating furnace on the platform above the electric heating front bed to the platform above the oxygen-enriched side-blown furnace, control the gas heating furnace to continuously blow heating gas into the oxygen-enriched side-blown furnace, and bake the oxygen-enriched side-blown furnace at a low temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace. (4) High-temperature baking stage of electric heating front bed and medium-temperature baking stage of oxygen-enriched side-blown furnace: A coke layer is laid inside the electric heating front bed, the coke layer is ignited, and the electric heating front bed is baked at high temperature according to the temperature range and time of the refractory material of the electric heating front bed. At the same time, a firewood layer is laid inside the oxygen-enriched side-blown furnace, the firewood layer is ignited, and the furnace is baked at low temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace. (5) Slag-making and heat preservation of the electric heating front bed and high-temperature baking stage of oxygen-enriched side-blown furnace: A slag-making material layer is laid in the electric heating front bed, and the electrode lifting system of the electric heating front bed is controlled to lower the electrode and ignite the slag-making material layer to slag-making and heat preservation of the electric heating front bed. At the same time, a coke layer is laid in the oxygen-enriched side-blown furnace, and the coke layer is ignited. The oxygen-enriched side-blown furnace is baked at high temperature according to the temperature range and time of the refractory material of the oxygen-enriched side-blown furnace. (6) End of furnace baking stage: After the oxygen-enriched side-blown melting furnace and the electric heating front bed have been heated, the furnace can be started by feeding materials.

2. The method for baking a furnace using an oxygen-enriched side-blown smelting furnace and an electrically heated forecourt as described in claim 1, characterized in that: In the pre-furnace preparation stage, the electric heating front bed is filled with a rectangular frame welded from 8-10mm steel plates and placed in the center of the electrode. Inside the frame, a 30mm thick graphite conductive layer is tamped at the bottom. Copper-clad iron fragments are laid on top of the graphite conductive layer. Copper matte blocks and water-quenched slag are filled outside the frame, with a thickness of 80-100mm.

3. The method for baking a furnace using an oxygen-enriched side-blown smelting furnace and an electrically heated forecourt as described in claim 1, characterized in that: In the low-temperature baking stage of the electric heating front bed, the gas outlet pipe of the gas heating furnace is connected to a four-way pipe through a flange. The low-temperature baking stage of the electric heating front bed lasts for 60 hours, with the temperature controlled at 200-250℃.

4. The method for baking a furnace using an oxygen-enriched side-blown smelting furnace and an electrically heated forecourt as described in claim 1, characterized in that: The thickness of the firewood layer in the electric heating forecourt during the medium-temperature drying stage and the oxygen-enriched side-blown furnace low-temperature drying stage is 60-80mm. The medium-temperature drying stage of the electric heating forecourt lasts for 48 hours with a controlled temperature of 450-600℃, and the low-temperature drying stage of the oxygen-enriched side-blown furnace lasts for 72 hours with a controlled temperature of 250-300℃.

5. The method for baking a furnace using an oxygen-enriched side-blown smelting furnace and an electrically heated forecourt as described in claim 1, characterized in that: The coke layer thickness in the electric heating front bed during the high-temperature drying stage and the oxygen-enriched side-blown furnace during the medium-temperature drying stage is 50-60mm. The high-temperature drying stage of the electric heating front bed lasts for 48 hours with a controlled temperature of 850-950℃. The firewood layer thickness in the oxygen-enriched side-blown furnace is 50-70mm. The medium-temperature drying stage of the oxygen-enriched side-blown furnace lasts for 48 hours with a controlled temperature of 400-550℃.

6. The method for baking a furnace using an oxygen-enriched side-blown smelting furnace and an electrically heated forecourt as described in claim 1, characterized in that: The thickness of the slag-forming layer in the electric heating front bed during the slag-forming and heat-preserving stage of the oxygen-enriched side-blown furnace and the high-temperature baking stage of the electric heating front bed is 80-100mm. The slag-forming and heat-preserving stage of the electric heating front bed lasts for 60 hours, with the temperature controlled at 1000-1100℃. The thickness of the coke layer in the oxygen-enriched side-blown furnace is 40-50mm. The high-temperature baking stage of the oxygen-enriched side-blown furnace lasts for 36 hours, with the temperature controlled at 800-900℃.

7. The method for baking a furnace using an oxygen-enriched side-blown smelting furnace and an electrically heated forecourt as described in claim 1, characterized in that: The water vapor and flue gas generated during the heating process of the electric heating front bed and the oxygen-enriched side-blown furnace are all fed into the rear flue gas treatment process system through the same 50kW circular fan via the flue pipe.

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