Ultralow-frequency power supply electric furnace equipment device for extracting metal from solid waste residues

Abstract

The utility model relates to an ultra-low frequency power supply electric furnace equipment device for extracting metal from solid waste slag, a furnace shell is fixedly arranged on a movable flatcar, the movable flatcar can move between a slag receiving station and a reaction station, a furnace cover is arranged above the reaction station, and a furnace cover lifting device is arranged on the furnace cover; the graphite electrode is arranged above the furnace cover, an electrode lifting device is arranged on the graphite electrode, and the shape of the graphite electrode is matched with that of an electrode opening in the furnace cover; and the power supply is a three-phase ultralow-frequency power supply device with controllable polarity and is electrically connected with the graphite electrode. The method can be used for the technological process of extracting valuable metal from solid waste slag containing oxidized metal through melting and smelting, can accelerate reduction and enrichment of the valuable metal, improves the recovery rate of the metal, reasonably utilizes the heat of high-temperature liquid slag, directly reduces the metal in the slag, improves the recovery ratio and purity of the metal in the solid waste slag, and reduces the production cost. And meanwhile, solid waste residues obtained after metal extraction are subjected to slag system reconstruction, so that the activity is improved, the quality is stable, and waste is turned into wealth.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical solid waste slag treatment, in particular to an ultra-low frequency power supply electric furnace equipment device for extracting metal from solid waste slag. Background Art

[0002] Solid waste refers to solid waste generated during social life or industrial production. It can be divided into multiple categories based on composition, form, source, and other criteria. Smelting slag, among other solid waste types, is rich in valuable metals and highly recyclable. Valuable metals in slag can be recovered, and the resulting depleted slag can be used as a raw material for insulation or construction materials.

[0003] For example, steelmaking solid waste, also known as steel slag, is a metallurgical waste that every steel mill must dispose of. Discarded slag from electric furnace and converter steelmaking often contains approximately 20% iron oxides and around 10% free iron, making it highly valuable for recycling. However, steel slag has extremely low reactivity and is essentially unusable.

[0004] Existing equipment and methods for the disposal of oxide slag solid waste generally include wet refining, solid-state roasting and electric furnace smelting.

[0005] Wet refining is a method that uses chemical solution reactions to extract reducible or elemental metal elements from solid waste residues. It is carried out using the principles and techniques of chemical hydrometallurgy. Therefore, this disposal method will cause secondary pollution of wastewater. At the same time, due to the low content of recyclable elements in solid waste residues, the disposal cost is often high. It is only suitable for a very small number of solid wastes with great recovery value and relatively light secondary pollution.

[0006] Solid-state roasting is a process in which oxide slag solid waste is mixed with auxiliary materials such as reducing agents, and then calcined through roasting kiln equipment or high-temperature and high-pressure treatment. The metal oxides in the solid waste will be partially reduced to simple substances, and then the reduced metal elements are extracted through magnetic separation or wet leaching. Therefore, this disposal method requires the recovered metal to be magnetic, or needs to be combined with wet refining for the final recovery of valuable metals. The recovery efficiency is low, the cost is high, and the application range is narrow.

[0007] Electric furnace smelting involves melting oxidized slag solid waste at high temperatures in an electric arc furnace, separating the metal elements or performing liquid-phase reduction to produce valuable metal liquid and depleted slag. This disposal method is the most widely used solid waste disposal method, and almost all solid waste slag containing high-value metals can be recovered using electric furnace smelting. The solid waste slag treated through electric furnace smelting has the vast majority of the metal elements extracted, resulting in a highly reactive depleted slag melt containing a small amount of free metal.

[0008] Therefore, it is necessary to provide an ultra-low frequency power supply electric furnace device for metal extraction of solid waste residue, which can provide a heat source for heat preservation and reconstruction of the solid waste residue and more thoroughly recover the metal in the solid waste residue. Content of the utility model

[0009] Therefore, the utility model discloses a kind of ultra-low frequency power supply electric furnace device for metal extraction of solid waste residue, power supply can output frequency extremely low, polarity controllable power supply, into furnace electric efficiency is high, with the function of stirring molten pool.

[0010] To solve the above technical problems, the utility model adopts the following technical solutions:

[0011] An ultra-low frequency power supply electric furnace device for metal extraction of solid waste residue includes furnace body, mobile flatcar, graphite electrode and power supply, the furnace body includes furnace shell and furnace cover, the furnace shell is fixedly arranged on the mobile flatcar, the mobile flatcar can move between slag receiving station and reaction station, the furnace cover is arranged above the reaction station and the furnace cover is provided with furnace cover lifting device, the furnace cover is provided with feed inlet and electrode port;The graphite electrode is arranged above the furnace cover, the graphite electrode is provided with electrode lifting device, and the shape of the graphite electrode is matched with the electrode port on the furnace cover;The power supply is a three-phase controllable polarity ultra-low frequency power supply device, and the power supply is electrically connected with the graphite electrode.

[0012] The mobile flatcar drives the furnace shell to move between the slag receiving station and the reaction station, and the furnace shell has no furnace cover in the slag receiving station, so that the red-hot slag melt can be conveniently charged into the furnace during electric furnace disposal of solid waste residue, and even if there are low-temperature solid blocks in the slag, they can also be conveniently poured into the furnace.The furnace cover is installed on the lifting bridge and is driven by hydraulic pressure to lift and run.The power supply can output power with extremely low frequency and controllable polarity;compared with ordinary electric furnaces, the power supply has high electric efficiency, the function of stirring molten pool, and the cost of nitrogen and argon for stirring molten pool is saved, which is beneficial to reduction and melting separation process of the electric furnace equipment, accelerates the reaction rate and improves the recovery rate.

[0013] Preferably, the power supply further includes a control system, and the control system is an impedance electrode adjustment system.The control system takes the impedance electrode adjustment system as the core, cooperates with the three-phase controllable polarity ultra-low frequency power supply device, and realizes the unique power supply structure of the novel electric furnace equipment.

[0014] Preferably, the graphite electrode is a three-phase lifting electrode system, the lifting control of the three-phase lifting electrode is independent of each other, and the power supply polarity of the three-phase lifting electrode is the same.

[0015] Preferably, the upper part of the furnace cover is provided with a feeding pipe matched with a feeding port on the furnace cover. The reducing agent and the reconstitution agent are added into the furnace shell through the feeding pipe. The feeding pipe is provided with a winch. When feeding, the feeding pipe is inserted into the furnace shell through the feeding port to a position close to the surface of the molten pool by the winch, and when feeding is completed, the feeding pipe is pulled out of the furnace shell by the winch, so that the feeding pipe is prevented from being deformed by high temperature in the furnace shell for a long time.

[0016] Preferably, the side wall of the furnace shell is further provided with a tapping hole and a slag hole, and the position of the slag hole is higher than that of the tapping hole. The furnace body is mounted on a movable flat car, and the furnace shell does not dump during use. The molten pool in the furnace is discharged by opening the tapping hole and the slag hole; the flow discharge type can more easily make the upper and lower layered slag liquid and molten iron in the furnace be discharged respectively.

[0017] Preferably, the furnace cover is a tubular water-cooled structure, and the furnace shell is a double-layer water-cooled structure. The high temperature of smelting is isolated, and the service life is long enough to prevent the refractory material from overheating and reduce the consumption of the refractory material.

[0018] The working process of the ultra-low frequency power supply electric furnace equipment device for solid waste slag metal extraction is as follows:

[0019] Step 1, the movable flat car carries the furnace shell to a slag receiving station, and high-temperature liquid slag is poured into the furnace shell by a crown block;

[0020] Step 2, the movable flat car carries the furnace shell to a reaction station, and the furnace cover is driven by a furnace cover lifting device to fall on the furnace shell and tightly cover the furnace shell;

[0021] Step 3, the graphite electrode is lowered and inserted into the liquid slag in the furnace shell by an electrode lifting device for heating. By power control, three-phase ultra-low frequency controllable polarity power supply into the furnace can be realized when the solid waste slag is disposed, the electric energy utilization rate is improved, the molten pool stirring effect in the furnace is realized, the reaction rate in the furnace is accelerated, and the metal recovery rate is improved;

[0022] Step 4, the feeding pipe is inserted into the furnace to add reducing agent to reduce the metal in the slag and reconstitution agent to reconstitute the original slag system into raw materials of cement clinker, slag powder, mineral wool and microcrystalline glass products. After feeding is completed, the feeding pipe is pulled out of the furnace by the winch;

[0023] Step 5, after the reaction is completed, the upper slag liquid is discharged by opening the slag hole, and then the lower metal liquid is discharged by opening the tapping hole;

[0024] Step 6, during the heating treatment of the solid waste slag, cooling water continuously flows through the water-cooled structure of the furnace cover and the furnace shell to cool the furnace cover and the furnace shell, so that the service life is longer;

[0025] After the slag and metal liquid are discharged, the furnace cover is lifted by the furnace cover lifting device to move away from the furnace shell, and the movable flat car carries the furnace shell to the slag receiving station to continue the slag feeding and the next working cycle.

[0026] The beneficial effects of the utility model are as follows:

[0027] The utility model discloses a kind of ultra-low frequency power supply electric furnace equipment devices for solid waste slag metal extraction, using the method of high-temperature liquid slag is directly put into furnace treatment, save the electrode heating power consumption of solid waste slag melting treatment device, save electricity.It can be used in the process of extracting valuable metal from the smelting of solid waste slag containing oxidized metal, can accelerate the reduction enrichment of valuable metal, improve the recovery rate of metal, and reasonably utilize the heat of high-temperature liquid slag, directly reduce metal in slag, improve the recovery ratio and purity of metal in solid waste slag, simultaneously reconstruct the slag system after extracting metal, so that its activity is improved, quality is stable, waste is turned into treasure.

[0028] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model and can be implemented according to the content of the specification, at the same time, in order to make the above and other purposes, technical features and advantages of the utility model more easy to understand, one or more preferred embodiments are listed below, and are described in detail as follows with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] One or more embodiments are exemplarily illustrated by pictures in corresponding drawings, which do not constitute limitation to the embodiments, elements with same reference numerals in drawings represent similar elements, unless specially stated, and the drawings do not constitute proportional limitation.

[0030] Figure 1 The reaction station structure schematic diagram of the utility model discloses a kind of ultra-low frequency power supply electric furnace equipment devices for solid waste slag metal extraction is shown.

[0031] Figure 2 The slag receiving station structure schematic diagram of the utility model discloses a kind of ultra-low frequency power supply electric furnace equipment devices for solid waste slag metal extraction is shown.

[0032] MAIN REFERENCE NUMERALS EXPLANATION:

[0033] 1-furnace cover, 2-furnace shell, 3-graphite electrode, 4-movable flat car, 5-power supply, 6-feeding pipe, 7-tapping hole, 8-discharge hole. DETAILED DESCRIPTION

[0034] The specific embodiments of the utility model are described in detail below with reference to the drawings, but it should be understood that the protection scope of the utility model is not limited by the specific embodiments.

[0035] Unless expressly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising” will be understood to include the stated elements or components but not to exclude other elements or components.

[0036] In this document, for ease of description, spatially relative terms such as "below," "beneath," "down," "above," "above," etc. may be used to describe the relationship of one element or feature to another element or feature in the accompanying drawings. It should be understood that the spatially relative terms are intended to encompass different orientations of an object in use or operation in addition to the orientation depicted in the drawings. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above directions. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatially relative terms used herein should be interpreted accordingly.

[0037] like Figure 1-Figure 2 As shown, an ultra-low frequency power supply electric furnace equipment device for extracting metal from solid waste slag includes a furnace body, a movable flat car 4, a graphite electrode 3 and a power supply 5. The furnace body includes a furnace shell 2 and a furnace cover 1. The furnace shell 2 is fixedly set on the movable flat car 4. The movable flat car 4 can move between the slag receiving station and the reaction station. The furnace cover 1 is set above the reaction station and is provided with a furnace cover lifting device. The furnace cover 1 is provided with a feed port and an electrode port. The movable flat car 4 drives the furnace shell 2 to move between the slag receiving station and the reaction station. The furnace shell 2 does not have a furnace cover 1 at the slag receiving station. When the electric furnace is used to dispose of solid waste slag, it is convenient to accept the addition of red-hot slag melt into the furnace. Even if there are low-temperature solid blocks in the slag, they can be easily dumped into the furnace. The furnace cover 1 is installed on a lifting bridge and is driven by hydraulic pressure to move up and down.

[0038] The furnace cover 1 is a tubular water-cooled structure, and the furnace shell 2 is a double-layer water-cooled structure, which can isolate the high smelting temperature and have a sufficiently long service life, thereby preventing the refractory material from overheating and reducing the consumption of the refractory material.

[0039] The graphite electrode 3 is arranged above the furnace cover 1. An electrode lifting device is provided on the graphite electrode 3. The shape of the graphite electrode 3 matches the electrode opening on the furnace cover 1. The graphite electrode 3 is a three-phase lifting electrode system. The lifting control of the three-phase lifting electrodes is independent of each other, and the supply polarity of the three-phase lifting electrodes is the same.

[0040] The power supply 5 is a three-phase ultra-low frequency power supply device with controllable polarity, and the power supply 5 is electrically connected to the graphite electrode 3. The power supply 5 can output power with extremely low frequency and controllable polarity. The power supply characteristics of this power supply are high in efficiency of electricity entering the furnace and have the function of stirring the molten pool. Compared with ordinary electric furnaces, it saves the cost of introducing nitrogen and argon to stir the molten pool, which is beneficial for the electric furnace equipment to carry out reduction and melting processes, accelerate the reaction rate, and improve the reaction recovery rate. The power supply 5 also includes a control system, which is an impedance electrode adjustment system. The control system is based on the impedance electrode adjustment system and cooperates with the three-phase ultra-low frequency power supply device with controllable polarity to realize the unique power supply structure of this new electric furnace equipment.

[0041] A feed pipe 6 is provided above the furnace cover 1, which mates with the feed port on the cover 1. Reducing agent and reconstitution agent are added to the furnace shell 2 through the feed pipe 6. The feed pipe 6 is equipped with a winch. When adding materials to the furnace shell 2, the winch inserts the feed pipe 6 through the feed port into the furnace shell 2 near the surface of the molten pool to drop the materials. When the materials are added, the winch removes the feed pipe 6 from the furnace shell 2 to prevent deformation caused by prolonged high temperatures within the furnace shell.

[0042] The sidewalls of the furnace shell 2 are also provided with an iron tapping port 7 and a slag tapping port 8, which are positioned higher than the iron tapping port 7. The furnace body is mounted on a movable flat car 4, preventing the furnace shell 2 from tipping over during use. The molten pool within the furnace is released by opening the iron tapping port 7 and slag tapping port 8; this flow-type tapping method facilitates the separate discharge of the slag and molten iron from the upper and lower layers within the furnace.

[0043] The working process of the ultra-low frequency power supply electric furnace equipment device for extracting metal from solid waste slag in the utility model is as follows:

[0044] Step 1: The mobile flat car 4 carries the furnace shell 2 to the slag receiving station, and the high-temperature liquid slag is poured into the furnace shell 2 by the overhead crane;

[0045] Step 2: The mobile flat car 4 carries the furnace shell 2 to the reaction station, and the furnace cover 1 is driven by the furnace cover lifting device to fall onto the furnace shell 2 and cover it tightly;

[0046] Step 3: The graphite electrode 3 is lowered by the electrode lifting device and inserted into the liquid slag in the furnace shell 2 for heating. The power supply 5 is controlled to realize three-phase ultra-low frequency controllable polarity power supply into the furnace when the solid waste slag is disposed of, thereby improving the utilization rate of electric energy, achieving the stirring effect of the molten pool in the furnace, accelerating the reaction rate in the furnace, and improving the metal recovery rate.

[0047] In step 4, the feed pipe 6 is inserted into the furnace, and a reducing agent is added to reduce the metal in the slag and a reconstructing agent is added to reconstruct the original slag into raw materials for cement clinker, slag powder raw materials, mineral wool, microcrystalline glass and other products. After the addition is completed, the feed pipe 6 is pulled out of the furnace by a winch;

[0048] Step 5, after the reaction is completed, open the slag outlet 8 to discharge the upper slag liquid, and then open the tapping hole 7 to discharge the lower metal liquid;

[0049] Step 6, during the solid waste slag heating treatment process, the cooling water is always flowing through the water cooling structure of the furnace cover 1 and the furnace shell 2 to cool the furnace cover 1 and the furnace shell 2, so as to ensure a longer service life;

[0050] Step 7, after the slag liquid and the metal liquid are discharged, the furnace cover 1 is lifted to be separated from the furnace shell 2 by the furnace cover lifting device, and the flat car 4 is moved to carry the furnace shell 2 to the slag receiving station to continue the slag feeding, and the next working cycle is carried out.

[0051] The foregoing description of the specific exemplary embodiments of the present application is for the purpose of explanation and illustration. Such description is not intended as a limitation on the precise form disclosed, and obviously many modifications and variations are possible in light of the above teachings. It is intended that the scope of the application be limited not with this specific description of exemplary embodiments, but rather by the appended claims.

Claims

1. An ultra-low frequency power supply electric furnace device for extracting metal from solid waste slag, characterized in that: The invention comprises a furnace body, a movable flat car (4), a graphite electrode (3) and a power supply (5); the furnace body comprises a furnace shell (2) and a furnace cover (1); the furnace shell (2) is fixedly arranged on the movable flat car (4); the movable flat car (4) can move between a slag receiving station and a reaction station; the furnace cover (1) is arranged above the reaction station and is provided with a furnace cover lifting device; and the furnace cover (1) is provided with a feed port and an electrode port; The graphite electrode (3) is arranged above the furnace cover (1), an electrode lifting device is provided on the graphite electrode (3), and the shape of the graphite electrode (3) matches the electrode opening on the furnace cover (1); The power supply (5) is a three-phase ultra-low frequency power supply device with controllable polarity, and the power supply (5) is electrically connected to the graphite electrode (3).

2. The ultra-low frequency power supply electric furnace device for extracting metal from solid waste slag according to claim 1 is characterized in that: The power supply (5) further comprises a control system, which is an impedance electrode adjustment system.

3. The ultra-low frequency power supply electric furnace device for extracting metal from solid waste slag according to claim 2, characterized in that: The graphite electrode (3) is a three-phase lifting electrode system, the lifting and lowering controls of the three-phase lifting electrodes are independent of each other, and the supply polarities of the three-phase lifting electrodes are the same.

4. The ultra-low frequency power supply electric furnace device for extracting metal from solid waste slag according to claim 3 is characterized in that: A feed pipe (6) is provided above the furnace cover (1), and the feed pipe (6) matches the feed opening on the furnace cover (1).

5. The ultra-low frequency power supply electric furnace device for extracting metal from solid waste slag according to claim 4, characterized in that: An iron tapping port (7) and a slag tapping port (8) are also provided on the side wall of the furnace shell (2), and the position of the slag tapping port (8) is higher than that of the iron tapping port (7).

6. The ultra-low frequency power supply electric furnace equipment device for extracting metals from solid waste slag according to claim 1 is characterized in that: The furnace cover (1) is a tubular water-cooling structure, and the furnace shell (2) is a double-layer water-cooling structure.

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