Mineral smelting system with preheating device

Abstract

The utility model relates to the technical field of mineral smelting energy conservation, in particular to a mineral smelting system with a preheating device, which comprises a mineral pretreatment component, a preheating component and a smelting electric furnace, the mineral pretreatment equipment is connected with the heat preservation temporary storage bin and used for processing and converting mineral raw materials into mineral aggregates suitable for being smelted by a smelting electric furnace and conveying the mineral aggregates to the heat preservation temporary storage bin. The preheating assembly is used for receiving the mineral aggregates and auxiliary materials in the heat preservation material tank and preheating the mineral aggregates and the auxiliary materials. The preheating assembly is connected with the electric smelting furnace and used for conveying the preheated mineral aggregate and auxiliary materials to the electric smelting furnace for smelting. Gas resources generated by the electric smelting furnace can be fully utilized, the requirement for external energy in the preheating process is reduced, and the energy-saving effect can be achieved by feeding preheated mineral aggregates and auxiliary materials into the electric smelting furnace for smelting.

Description

Technical Field

[0001] The utility model relates to the technical field of mineral smelting energy saving, in particular to a mineral smelting system with a preheating device. Background Art

[0002] The existing chromium ore smelting generally involves first roasting the chromium ore in a pellet roasting shaft furnace to obtain chromium ore pellets, which are then hot-charged into an insulated material tank. After adding the corresponding weight of reducing agent and flux into the insulated material tank, the material tank is hoisted by a crane to the insulated material bin on the top of the smelting workshop, and then directly added into the smelting electric furnace through an insulated material pipe for smelting.

[0003] The existing manganese ore smelting generally first uses a sintering machine to sinter and thermally break the manganese ore to obtain sintered ore, which is then hot-charged into an insulated material tank. After adding the corresponding weight of reducing agent and flux into the insulated material tank, the material tank is hoisted by a crane to the insulated material bin on the top of the smelting workshop, and then directly added into the smelting electric furnace through an insulated material pipe for smelting.

[0004] The above two mineral hot charging modes can utilize some of the residual energy of mineral thermal processing. However, although the heat preservation tank and the heat preservation silo can preserve some of the heat of the hot ore, the heat of the hot ore is lost due to the long time the hot ore stays on the furnace top, which greatly reduces the expected residual energy utilization effect and makes the smelting electric furnace fail to achieve the expected smelting energy saving effect. In addition, in the process of adding other auxiliary materials such as coke reducing agent into the heat preservation tank, it will cause partial oxidation and burning of the coke, posing a safety hazard. Utility Model Content

[0005] The purpose of the utility model is to provide a mineral smelting system with a preheating device, which at least solves one of the problems raised in the background technology.

[0006] In order to achieve the purpose of this utility model, the following technical solutions are adopted:

[0007] A mineral smelting system with a preheating device comprises a mineral pretreatment component, a preheating component and a smelting electric furnace, the mineral pretreatment component comprises a mineral pretreatment equipment, an insulated temporary storage bin, an auxiliary material bin and an insulated material tank, the mineral pretreatment equipment is connected to the insulated temporary storage bin for processing the mineral raw materials into ore suitable for smelting in the smelting electric furnace and conveying them to the insulated temporary storage bin, a first feeder and a first weighing hopper are connected between the insulated temporary storage bin and the insulated material tank for quantitatively conveying the ore into the insulated material tank, a second feeder and a second weighing hopper are connected between the auxiliary material bin and the insulated material tank for quantitatively conveying the auxiliary material into the insulated material tank, the preheating component is used to receive the ore and auxiliary material in the insulated material tank and preheat the ore and auxiliary material, and the preheating component is connected to the smelting electric furnace for conveying the preheated ore and auxiliary material to the smelting electric furnace for smelting.

[0008] A further improvement is that the mineral pretreatment equipment is a pellet roasting shaft furnace or a sintering machine.

[0009] A further improvement is that the auxiliary materials include a reducing agent and a flux.

[0010] A further improvement is that the mineral pretreatment component also includes a nitrogen filling device, and a nitrogen filling interface is provided on the thermal insulation material tank. The nitrogen filling device and the nitrogen filling interface are used for nitrogen filling protection in the thermal insulation material tank.

[0011] A further improvement is that the preheating component includes a smelting electric furnace gas recovery and processing device, a gas pressure station, a gas generator set, a denitrification and desulfurization device and a preheating device. The preheating device is used to receive the mineral material and auxiliary materials in the insulation tank. The gas pressure station is connected to the gas generator set. The smelting electric furnace gas recovery and processing device is respectively connected to the smelting electric furnace and the gas pressure station for purifying the gas generated by the smelting electric furnace and sending it to the gas generator set through the gas pressure station for power generation. The denitrification and desulfurization device is connected to the exhaust gas discharge port of the gas generator set for denitrification and desulfurization of the exhaust gas generated after power generation. The denitrification and desulfurization device is connected to the preheating device for sending the exhaust gas after denitrification and desulfurization into the preheating device to preheat the mineral material and auxiliary materials. The preheating device is connected to the smelting electric furnace for transporting the preheated mineral material and auxiliary materials to the smelting electric furnace for smelting.

[0012] Alternatively, the preheating component includes a smelting electric furnace gas recovery and processing device, a gas combustion chamber and a preheating device, the air inlet of the smelting electric furnace gas recovery and processing device is connected to the exhaust port of the smelting electric furnace, the exhaust port of the smelting electric furnace gas recovery and processing device is connected to the air inlet of the gas combustion chamber, the gas combustion chamber is connected to the preheating device for burning coal gas to generate hot flue gas which is sent to the preheating device to preheat the ore and auxiliary materials, and the preheating device is connected to the smelting electric furnace for transporting the preheated ore and auxiliary materials to the smelting electric furnace for smelting.

[0013] A further improvement is that the preheating assembly further comprises a combustion-supporting fan, the exhaust port of the combustion-supporting fan is connected to another air inlet of the gas combustion chamber for mixing part of the air into the gas combustion chamber.

[0014] A further improvement is that the smelting electric furnace gas recovery and processing device includes a first bag dust collector and a gas holder, and the first bag dust collector is respectively connected to the smelting electric furnace and the gas holder to purify the gas generated by the smelting electric furnace and send it to the gas holder for storage.

[0015] A further improvement is that the preheating device is a distributed preheating system.

[0016] A further improvement is that the preheating component also includes a second bag dust collector, a main smoke exhaust fan, and a chimney. The second bag dust collector is connected to the exhaust port of the preheating device, and the main smoke exhaust fan is respectively connected to the second bag dust collector and the chimney, so as to purify the smoke exhausted by the preheating device through the second bag dust collector and then discharge it into the atmosphere through the chimney.

[0017] Beneficial effects of the utility model:

[0018] The utility model purifies the coal gas generated by the smelting electric furnace first, and then stores it in a gas tank, and uses the coal gas in the gas tank to send it to a gas generator set to generate high-temperature exhaust gas or to a gas combustion chamber for combustion to generate hot flue gas, and uses the high-temperature exhaust gas or hot flue gas to preheat mineral materials and auxiliary materials, so as to make full use of the coal gas resources generated by the smelting electric furnace, reduce the demand for external energy in the preheating process, and achieve energy-saving effect by having the preheated mineral materials and auxiliary materials enter the smelting electric furnace for smelting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structural principle of a mineral smelting system with a preheating device in Embodiment 1 of the present utility model;

[0020] Figure 2 This is a schematic diagram of the structural principle of a mineral smelting system with a preheating device in Example 2 of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and do not limit the protection scope of the utility model.

[0022] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixed on" or "installed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. Furthermore, when an element is considered to be "transmission-connected" to another element, the two can achieve power transmission, and its specific implementation method can be implemented using the existing technology, which will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only and do not represent the only implementation method.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] The “first” and “second” involved in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0025] Embodiment 1:

[0026] Please refer to the attached Figure 1 , an embodiment of the utility model proposes a mineral smelting system with a preheating device, including a mineral pretreatment component, a preheating component and a smelting electric furnace, the mineral pretreatment component including a mineral pretreatment equipment, a heat-insulating temporary storage bin, an auxiliary material bin and a heat-insulating material tank, the mineral pretreatment equipment is connected to the heat-insulating temporary storage bin for processing the mineral raw materials into ore suitable for smelting in the smelting electric furnace and transporting them to the heat-insulating temporary storage bin, a first feeder and a first weighing hopper are connected between the heat-insulating temporary storage bin and the heat-insulating material tank for quantitatively transporting the ore into the heat-insulating material tank, a second feeder and a second weighing hopper are connected between the auxiliary material bin and the heat-insulating material tank for quantitatively transporting the auxiliary material into the heat-insulating material tank, the preheating component is used to receive the ore and auxiliary material in the heat-insulating material tank and preheat the ore and auxiliary material, and the preheating component is connected to the smelting electric furnace for transporting the preheated ore and auxiliary material to the smelting electric furnace for smelting.

[0027] In this embodiment, the mineral pretreatment equipment is a pellet roasting shaft furnace, and the mineral raw material is chromium ore.

[0028] It is understandable that the pelletizing shaft furnace is mainly used for the production of pelletized ore, and its process is to mix the finely ground ore powder with a binder (such as bentonite), make small balls through a pelletizing machine, and then send them into the shaft furnace for high-temperature roasting. In this embodiment, the chromium ore is roasted in the roasting shaft furnace to form chromium ore pellets with a certain temperature, that is, the ore material is chromium ore pellets. In this process, the chromium ore powder undergoes the steps of balling, roasting, etc. to form pellets with a certain physical strength and chemical activity, which are more suitable for subsequent smelting in an electric furnace.

[0029] In this embodiment, the auxiliary materials include a reducing agent and a flux. Preferably, the reducing agent may be a coke reducing agent, and the flux may be a mineral such as silica, magnesite, lime, etc., which is used to adjust the composition of smelting slag.

[0030] In a feasible scheme of this embodiment, the mineral pretreatment component also includes a nitrogen filling device, and a nitrogen filling interface is provided on the insulation tank. The nitrogen filling device and the nitrogen filling interface are used to perform nitrogen filling protection in the insulation tank and replace the air outside the tank.

[0031] It is understandable that by filling with nitrogen blanket, the chance of the coke reducing agent contacting oxygen can be reduced, thus preventing oxidation burning.

[0032] In this embodiment, the preheating component includes a smelting electric furnace gas recovery and processing device, a gas pressure station, a gas generator set, a denitration and desulfurization device and a preheating device. The preheating device is used to receive the ore and auxiliary materials in the insulation tank. The gas pressure station is connected to the gas generator set. The smelting electric furnace gas recovery and processing device is respectively connected to the smelting electric furnace and the gas pressure station to purify the gas generated by the smelting electric furnace and send it to the gas generator set through the gas pressure station for power generation. The sulfur device is connected to the exhaust gas outlet of the gas generator set for denitrification and desulfurization of the exhaust gas (about 600 degrees Celsius) generated after power generation. The denitrification and desulfurization device is connected to the preheating device for sending the exhaust gas after denitrification and desulfurization treatment into the preheating device for preheating the ore and auxiliary materials. The ore and auxiliary materials are heated to about 500 degrees Celsius through convection heat exchange between the exhaust gas and the ore and auxiliary materials. The preheating device is connected to the smelting electric furnace for transporting the preheated ore and auxiliary materials to the smelting electric furnace for smelting.

[0033] It is understandable that by first purifying the coal gas generated by the smelting electric furnace and then sending it to the gas generator set to generate electricity, the coal gas resources generated by the smelting electric furnace can be fully utilized. By first treating the high-temperature exhaust gas (about 600 degrees Celsius) generated after power generation through a denitrification and desulfurization device, the emissions of nitrogen oxides and sulfur oxides can be effectively controlled, meeting the current strict environmental protection standards. By using the exhaust gas after denitrification and desulfurization as the heat source of the preheating device to preheat the ore and auxiliary materials, the energy waste caused by the direct emission of high-temperature exhaust gas generated after power generation is avoided, and the demand for external energy in the preheating process is reduced. The preheating process can achieve energy-saving effects by having the preheated ore and auxiliary materials enter the smelting electric furnace for smelting.

[0034] In this embodiment, the smelting electric furnace gas recovery and processing device includes a first bag dust collector and a gas holder. The first bag dust collector is respectively connected to the smelting electric furnace and the gas holder to purify the gas generated by the smelting electric furnace and send it to the gas holder for storage.

[0035] It is understandable that the first bag filter can effectively remove dust particles in the gas, reduce the risk of wear and blockage of subsequent equipment, and improve the quality of gas. After purification, the gas is sent to the gas tank for storage. The function of the gas tank is to balance the supply and demand of gas. The gas booster station is responsible for pressurizing the stored gas to a pressure suitable for the working of the generator set. The gas booster station is a key equipment to ensure the efficiency and stability of gas transmission.

[0036] In a preferred solution of this embodiment, the preheating device is a distributed preheating system. The distributed preheating system is composed of a plurality of preheating furnaces, and the plurality of preheating furnaces are arranged in a distributed manner.

[0037] The working process is as follows: after a certain amount of mineral materials and auxiliary materials are loaded into the insulated material tank, the insulated material tank can be lifted by a crane to the charging bin on the top of the smelting workshop, and loaded into the distributed preheating system through the insulated material pipe for preheating. The preheated mineral materials and auxiliary materials are then transported to the smelting electric furnace through the insulated material pipe for smelting.

[0038] In this embodiment, the preheating component also includes a second bag dust collector, a main smoke exhaust fan, and a chimney. The second bag dust collector is connected to the exhaust port of the preheating device, and the main smoke exhaust fan is respectively connected to the second bag dust collector and the chimney, so as to purify the dust-containing flue gas discharged from the preheating device through the second bag dust collector and then discharge it into the atmosphere through the chimney.

[0039] It can be understood that by setting up the second bag dust collector, the main smoke exhaust fan and the chimney, not only the depth and breadth of smoke treatment are enhanced, but also the efficiency, safety and environmental protection of the smoke emission process are ensured.

[0040] Specifically, the denitration and desulfurization device comprises a denitration device and a desulfurization tower. The denitration device is connected to the tail gas discharge port of the gas generator set and the desulfurization tower respectively, and the desulfurization tower is connected to the preheating device.

[0041] Embodiment 2:

[0042] Please refer to the attached Figure 2 , Embodiment 2 of the present invention proposes a mineral smelting system with a preheating device, including a mineral pretreatment component, a preheating component and a smelting electric furnace, the mineral pretreatment component including a mineral pretreatment equipment, a heat-insulating temporary storage bin, an auxiliary material bin and a heat-insulating material tank, the mineral pretreatment equipment is connected to the heat-insulating temporary storage bin for processing the mineral raw materials into ore suitable for smelting in the smelting electric furnace and transporting them to the heat-insulating temporary storage bin, a first feeder and a first weighing hopper are connected between the heat-insulating temporary storage bin and the heat-insulating material tank for quantitatively transporting the ore into the heat-insulating material tank, a second feeder and a second weighing hopper are connected between the auxiliary material bin and the heat-insulating material tank for quantitatively transporting the auxiliary material into the heat-insulating material tank, the preheating component is used to receive the ore and auxiliary material in the heat-insulating material tank and preheat the ore and auxiliary material, and the preheating component is connected to the smelting electric furnace for transporting the preheated ore and auxiliary material to the smelting electric furnace for smelting.

[0043] In this embodiment, what is different from the first embodiment is that the mineral pretreatment equipment is a sintering machine, and the mineral raw material is manganese ore.

[0044] It is understandable that the working principle of the sintering machine is to mix the raw materials such as powder ore, solid fuel (such as coal powder), flux (such as limestone) in a certain proportion, and then perform high-temperature sintering on a continuously moving sintering belt after mixing, granulating (balling), and distributing. In this embodiment, the manganese ore is sintered by the sintering machine to form a manganese ore sinter with a certain temperature, that is, the ore material is a manganese ore sinter. After the manganese ore powder is mixed with other additives (such as fuel and flux) during the sintering process, it is consolidated at high temperature to form a block of sintered ore, which is characterized by having better physical properties (such as strength, particle size uniformity) and chemical reactivity than the original ore, and is more suitable for smelting in subsequent smelting electric furnaces.

[0045] In this embodiment, the auxiliary materials include a reducing agent and a flux. Preferably, the reducing agent may be a coke reducing agent, and the flux may be a mineral such as silica, magnesite, lime, etc., which is used to adjust the composition of smelting slag.

[0046] In a feasible scheme of this embodiment, the mineral pretreatment component also includes a nitrogen filling device, and a nitrogen filling interface is provided on the insulation tank. The nitrogen filling device and the nitrogen filling interface are used to perform nitrogen filling protection in the insulation tank and replace the air outside the tank.

[0047] It is understandable that by filling with nitrogen blanket, the chance of the coke reducing agent contacting oxygen can be reduced, thus preventing oxidation burning.

[0048] In this embodiment, what is different from the first embodiment is that the preheating component includes a smelting electric furnace gas recovery and processing device, a gas combustion chamber and a preheating device. The air inlet of the smelting electric furnace gas recovery and processing device is connected to the exhaust port of the smelting electric furnace, and the exhaust port of the smelting electric furnace gas recovery and processing device is connected to the air inlet of the gas combustion chamber. The gas combustion chamber is connected to the preheating device for burning coal gas to generate hot flue gas which is sent to the preheating device to preheat the ore and auxiliary materials. The preheating device is connected to the smelting electric furnace for conveying the preheated ore and auxiliary materials to the smelting electric furnace for smelting.

[0049] In a feasible solution of this embodiment, the preheating assembly further includes a combustion-supporting fan, and the exhaust port of the combustion-supporting fan is connected to another air inlet of the gas combustion chamber for mixing part of the air into the gas combustion chamber.

[0050] It is understandable that, by providing a combustion-supporting blower, a portion of air can be blown into the gas combustion chamber to mix with the gas, thereby playing a role in supporting combustion.

[0051] In this embodiment, the smelting electric furnace gas recovery and processing device includes a first bag dust collector and a gas holder. The first bag dust collector is respectively connected to the smelting electric furnace and the gas holder to purify the gas generated by the smelting electric furnace and send it to the gas holder for storage.

[0052] It is understandable that the first bag filter can effectively remove dust particles in the gas, reduce the risk of wear and blockage of subsequent equipment, and improve the quality of the gas. After purification, the gas is sent to the gas tank for storage. The function of the gas tank is to balance the supply and demand of gas and supply gas to the gas combustion chamber through the gas tank.

[0053] In a preferred solution of this embodiment, the preheating device is a distributed preheating system. The distributed preheating system is composed of a plurality of preheating furnaces, and the plurality of preheating furnaces are arranged in a distributed manner.

[0054] The working process is as follows: after a certain amount of mineral materials and auxiliary materials are loaded into the insulated material tank, the insulated material tank can be lifted by a crane to the charging bin on the top of the smelting workshop, and loaded into the distributed preheating system through the insulated material pipe for preheating. The preheated mineral materials and auxiliary materials are then transported to the smelting electric furnace through the insulated material pipe for smelting.

[0055] In this embodiment, the preheating component also includes a second bag dust collector, a main smoke exhaust fan, and a chimney. The second bag dust collector is connected to the exhaust port of the preheating device, and the main smoke exhaust fan is respectively connected to the second bag dust collector and the chimney, so as to purify the dust-containing flue gas discharged from the preheating device through the second bag dust collector and then discharge it into the atmosphere through the chimney.

[0056] It can be understood that by setting up the second bag dust collector, the main smoke exhaust fan and the chimney, not only the depth and breadth of smoke treatment are enhanced, but also the efficiency, safety and environmental protection of the smoke emission process are ensured.

[0057] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A mineral smelting system with a preheating device, characterized in that: It includes a mineral pretreatment component, a preheating component and a smelting electric furnace. The mineral pretreatment component includes a mineral pretreatment equipment, an insulated temporary storage bin, an auxiliary material bin and an insulated material tank. The mineral pretreatment equipment is connected to the insulated temporary storage bin and is used to process the mineral raw materials into ore suitable for smelting in the smelting electric furnace and transport them to the insulated temporary storage bin. A first feeder and a first weighing hopper are connected between the insulated temporary storage bin and the insulated material tank and are used to quantitatively transport the ore into the insulated material tank. A second feeder and a second weighing hopper are connected between the auxiliary material bin and the insulated material tank and are used to quantitatively transport the auxiliary material into the insulated material tank. The preheating component is used to receive the ore and auxiliary material in the insulated material tank and preheat the ore and auxiliary material. The preheating component is connected to the smelting electric furnace and is used to transport the preheated ore and auxiliary material to the smelting electric furnace for smelting.

2. A mineral smelting system with a preheating device according to claim 1, characterized in that: The mineral pretreatment equipment is a pellet roasting shaft furnace or a sintering machine.

3. A mineral smelting system with a preheating device according to claim 1 or 2, characterized in that: The auxiliary materials include a reducing agent and a flux.

4. A mineral smelting system with a preheating device according to claim 1 or 2, characterized in that: The mineral pretreatment component also includes a nitrogen filling device. The heat-insulating material tank is provided with a nitrogen filling interface. The nitrogen filling device and the nitrogen filling interface are used to perform nitrogen filling protection in the heat-insulating material tank.

5. The mineral smelting system with a preheating device according to claim 1, characterized in that: The preheating component includes a smelting electric furnace gas recovery and processing device, a gas pressure station, a gas generator set, a denitrification and desulfurization device and a preheating device. The preheating device is used to receive the mineral material and auxiliary materials in the insulation tank. The gas pressure station is connected to the gas generator set. The smelting electric furnace gas recovery and processing device is respectively connected to the smelting electric furnace and the gas pressure station for purifying the gas generated by the smelting electric furnace and sending it to the gas generator set through the gas pressure station for power generation. The denitrification and desulfurization device is connected to the tail gas discharge port of the gas generator set for denitrification and desulfurization of the tail gas generated after power generation. The denitrification and desulfurization device is connected to the preheating device for sending the tail gas after denitrification and desulfurization into the preheating device to preheat the mineral material and auxiliary materials. The preheating device is connected to the smelting electric furnace for transporting the preheated mineral material and auxiliary materials to the smelting electric furnace for smelting.

6. The mineral smelting system with a preheating device according to claim 1, characterized in that: The preheating component includes a smelting electric furnace gas recovery and processing device, a gas combustion chamber and a preheating device. The air inlet of the smelting electric furnace gas recovery and processing device is connected to the exhaust port of the smelting electric furnace, and the exhaust port of the smelting electric furnace gas recovery and processing device is connected to the air inlet of the gas combustion chamber. The gas combustion chamber is connected to the preheating device and is used to burn coal gas to generate hot flue gas, which is sent into the preheating device to preheat the ore and auxiliary materials. The preheating device is connected to the smelting electric furnace and is used to transport the preheated ore and auxiliary materials to the smelting electric furnace for smelting.

7. A mineral smelting system with a preheating device according to claim 6, characterized in that: The preheating assembly also includes a combustion-supporting fan, and the exhaust port of the combustion-supporting fan is connected to another air inlet of the gas combustion chamber for mixing part of the air into the gas combustion chamber.

8. A mineral smelting system with a preheating device according to any one of claims 5 to 7, characterized in that: The smelting electric furnace gas recovery and processing device includes a first bag dust collector and a gas holder. The first bag dust collector is respectively connected to the smelting electric furnace and the gas holder to purify the gas generated by the smelting electric furnace and send it to the gas holder for storage.

9. A mineral smelting system with a preheating device according to any one of claims 5 to 7, characterized in that: The preheating device is a distributed preheating system.

10. A mineral smelting system with a preheating device according to any one of claims 5 to 7, characterized in that: The preheating component also includes a second bag dust collector, a main smoke exhaust fan, and a chimney. The second bag dust collector is connected to the exhaust port of the preheating device, and the main smoke exhaust fan is respectively connected to the second bag dust collector and the chimney, and is used to purify the smoke exhausted by the preheating device through the second bag dust collector and then discharge it into the atmosphere through the chimney.

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