A metallurgical dust and sludge melting magnetization recovery system

Abstract

The present invention belongs to the technical field of metal smelting production, and specifically provides a metallurgical dust sludge melting magnetization recovery system, including a smelting reduction furnace, a raw material feeding component, a flue gas magnetization treatment device and a zinc-containing dust enrichment component. The smelting reduction furnace adopts a pyrometallurgical enrichment method, the molten iron obtained by melting is discharged from the iron outlet, the slag is discharged from the slag outlet, and zinc enters the flue gas magnetization treatment device together with the flue gas, so as to achieve the preliminary separation and enrichment of iron, slag and zinc. The raw material feeding component transports metallurgical dust sludge solid waste, coke and oxygen-enriched air into the smelting reduction furnace. After the flue gas of the smelting reduction furnace enters the flue gas magnetization treatment device, the coal gas can quickly reduce Fe2O3 in the flue gas to Fe3O4, making it have strong magnetism, and then the flue gas enters the second shell, the Fe3O4 is collected by magnetic adsorption, and the zinc-containing dust is collected by the zinc-containing dust enrichment component. Such a configuration is helpful to improve the recovery purity of iron and zinc, so as to better recycle and utilize iron and zinc.

Description

Technical Field

[0001] The invention belongs to the technical field of metal smelting production, and in particular relates to a metallurgical dust sludge melting magnetization recovery system. Background Art

[0002] Metallurgical dust is a solid waste generated by steel mills during the steel smelting process, and its output generally accounts for 8-12% of steel production. Metallurgical dust is rich in iron, zinc and other elements, and is a secondary resource with great recycling value. Metallurgical dust is also called iron- and zinc-containing dust, which mainly includes sintering electrostatic ash, steelmaking dust removal ash, steelmaking coarse ash, steelmaking fine ash, converter OG mud, iron oxide scale, blast furnace environmental ash, blast furnace gravity ash, blast furnace bag ash, etc. Due to its huge output, the development of appropriate processes to recycle these dusts is not only conducive to improving resource utilization and enhancing the economic benefits of steel mills, but also can solve the environmental pollution problem caused by dust in steel enterprises, killing two birds with one stone.

[0003] The most mature and widely used method for recovering metallurgical dust and sludge in the prior art is pyrometallurgical process treatment. The equipment for pyrometallurgical process treatment includes a melting furnace, a waste heat utilization device, a collection and treatment device, etc. Metallurgical dust and sludge, a reducing agent and other raw materials are put into a melting furnace, so that the iron and zinc elements are reduced at high temperature, and the iron element becomes molten iron and flows out from the iron outlet. The zinc element becomes gaseous under the high temperature environment in the melting furnace and flows to the collection and treatment device together with the flue gas. The collection and treatment device uses dust removal equipment such as a gravity dust removal chamber, a cyclone dust collector, and a bag dust collector to obtain zinc-rich dust, thereby achieving the purpose of recovering iron and zinc. When the pyrometallurgical dust and sludge are treated by pyrometallurgical process in the prior art, a small amount of iron inside the melting furnace will be mixed into the flue gas in the form of Fe2O3, and finally mixed into the zinc-rich dust as an impurity, which will affect the purity of the recovered zinc element. Summary of the invention

[0004] The present invention provides a metallurgical dust sludge melting magnetization recovery system, aiming to solve the problem in the prior art that when a molten furnace is used to reduce metallurgical dust sludge, a small amount of iron element will be mixed into the flue gas, and finally mixed into the zinc-rich dust in the form of impurities, affecting the purity of the recovered zinc element.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a metallurgical dust sludge melting magnetization recovery system, comprising:

[0006] The smelting reduction furnace comprises a smelting chamber, the side wall of the smelting chamber is provided with an iron outlet and a slag outlet, and the top of the smelting reduction furnace is provided with a smoke outlet;

[0007] A raw material feeding assembly, the discharge end of which is connected to the melting chamber, and is used to add metallurgical dust, coke and oxygen-enriched air into the melting chamber;

[0008] A flue gas magnetization treatment device, comprising a first shell, a second shell and an electromagnetic plate, wherein the first shell has a reduction chamber, one end of the reduction chamber is provided with a first air inlet and a second air inlet, and the other end is provided with a first exhaust port, the first air inlet is communicated with the flue gas outlet, and the second air inlet is communicated with a gas delivery pipeline; the second shell has a collection chamber, one end of the collection chamber is provided with a third air inlet, and the other end is provided with a second exhaust port, a discharge port is provided at the bottom of the collection chamber, the third air inlet is communicated with the first exhaust port, and the electromagnetic plate is arranged in the collection chamber; and

[0009] The zinc-containing dust enrichment component is communicated with the second exhaust port and is used for collecting the zinc-containing dust.

[0010] In a possible implementation, the raw material feeding assembly includes an oxygen-enriched air conveying mechanism, a metallurgical dust and sludge conveying mechanism, and a coke conveying mechanism, the oxygen-enriched air conveying mechanism includes an air source and two air pipelines, the air inlet ends of the two air pipelines are respectively connected to the air source, and the air outlet ends of the air pipelines extend into the melting chamber;

[0011] The discharge end of the metallurgical dust conveying mechanism is communicated with one of the gas pipelines, and the discharge end of the coke conveying mechanism is communicated with another of the gas pipelines.

[0012] In a possible implementation, the oxygen-enriched air conveying mechanism also includes a plurality of auxiliary air supply pipes, which are arranged along the circumference of the smelting reduction furnace, the air inlet ends of the auxiliary air supply pipes are connected to the air source, the air outlet ends of the auxiliary air supply pipes extend into the melting chamber, and the air outlet directions of the plurality of auxiliary air supply pipes are arranged along the tangential direction of the circumference.

[0013] In a possible implementation, the metallurgical dust and sludge conveying mechanism includes:

[0014] A screw conveyor is arranged above the corresponding gas pipeline;

[0015] A plurality of storage bins are respectively arranged on one side of the screw conveyor, and the discharge end of the storage bin is connected to the feed end of the screw conveyor; and

[0016] The intermediate material pipe is connected to the discharge end of the screw conveyor and the corresponding gas pipeline.

[0017] In a possible implementation, the screw conveyor includes:

[0018] A conveying shell having a conveying trough, the top of which is open, the cross section of which perpendicular to its own axis is U-shaped, and the discharge end of the storage bin is located above the conveying trough;

[0019] A feeding screw, comprising a rotating shaft and a spiral blade, wherein the rotating shaft is rotatably matched with the conveying shell, the spiral blade is arranged on the rotating shaft, and the spiral blade is provided with a plurality of avoidance grooves along its axial direction, and the avoidance grooves are arranged along the circumference of the spiral blade;

[0020] A first driving member is arranged in the conveying housing and is used to drive the rotating shaft to rotate around its own axis; and a plurality of material leveling plates are arranged in the conveying trough at intervals along the axial direction of the conveying trough, and the material leveling plates have material passing holes that penetrate through their own thickness direction.

[0021] In a possible implementation, a receiving groove is provided at a position corresponding to the avoidance groove on the inner wall of the conveying groove, and the material leveling plate includes:

[0022] A U-shaped plate is arranged in the accommodating groove; and a plurality of material leveling rods are arranged along the circumference of the U-shaped plate, one end of the material leveling rod is connected to the U-shaped plate, and the other end extends into the conveying groove along the radial direction of the U-shaped plate, and the material passing hole is formed between two adjacent material leveling rods, and the material leveling plate is a round rod.

[0023] In a possible implementation, the first shell is tubular, and a plurality of baffle mechanisms are further provided in the first shell. The plurality of baffle mechanisms are arranged in the reduction chamber at intervals along the length direction of the first shell, and the baffle mechanisms include:

[0024] A connecting plate is arranged in the reduction chamber, the connecting plate comprises a rotating part rotatably matched with the first shell, and two connecting parts extending radially along the rotating part, the two connecting parts are located in the same radial plane, and one of the connecting parts is provided with a sliding groove at an end away from the rotating part;

[0025] a second driving member, disposed on the first housing, and used to drive the rotating portion to rotate around an axis in a horizontal direction;

[0026] A telescopic plate, slidably matched with the slide groove;

[0027] An elastic member is arranged in the slide groove, and two ends of the elastic member are respectively connected to the connecting plate and the telescopic plate, and is configured with a pre-tightening force that makes the end of the telescopic plate extend out of the slide groove and abut against the inner wall of the reduction chamber.

[0028] In a possible implementation, the baffle mechanism has a working state and a cleaning state. When in the working state, the telescopic plates of two adjacent baffle mechanisms respectively abut against the top wall and the bottom wall of the reduction chamber, so that the reduction chamber forms a tortuous baffle channel.

[0029] When in the cleaning state, the telescopic plates of the deflection mechanism are all in contact with the top wall of the reduction chamber and are inclined at a preset angle to the axial direction of the reduction chamber.

[0030] In a possible implementation, a plurality of electromagnetic plates are provided, and the plurality of electromagnetic plates are arranged in the collecting chamber at equal intervals, and the electromagnetic plates are parallel to a connecting direction of the third air inlet and the second air outlet.

[0031] In a possible implementation, the zinc-containing dust enrichment assembly includes a gravity settling chamber, a cyclone dust collector, a bag filter and a chimney arranged in sequence, and the air inlet end of the gravity settling chamber is connected to the second exhaust port.

[0032] Compared with the prior art, the beneficial effects of the metallurgical dust sludge melting magnetization recovery system provided by the present invention are:

[0033] The present invention provides a metallurgical dust sludge melting magnetization recovery system, which includes a melting reduction furnace, a raw material feeding assembly, a flue gas magnetization treatment device, and a zinc-containing dust enrichment assembly. The melting reduction furnace adopts a pyrometallurgical enrichment method, and the molten iron obtained by melting is discharged from the iron outlet, and the slag is discharged from the slag outlet. Zinc enters the flue gas magnetization treatment device together with the flue gas, so that the iron, slag and zinc in the iron and zinc-containing steel dust sludge metallurgical solid waste can be initially separated and enriched. The raw material feeding assembly is used to transport metallurgical dust sludge solid waste, coke and oxygen-enriched air into the melting reduction furnace to facilitate the reduction reaction in the melting reduction furnace. After the flue gas from the smelting reduction furnace enters the first shell of the flue gas magnetization treatment device, the coal gas comes into contact with the iron oxide (Fe2O3) in the flue gas, which can quickly reduce the Fe2O3 in the flue gas to Fe3O4, so that the weakly magnetic ferric oxide is converted into the strongly magnetic ferroferric oxide. Then the flue gas enters the second shell, the ferroferric oxide is collected by magnetic adsorption, and the zinc-containing dust is collected by the zinc-containing dust enrichment component, and finally high-iron and low-zinc iron concentrate and zinc-rich dust are obtained, realizing the separation and enrichment of iron and zinc in steel dust.

[0034] The smelting reduction furnace, raw material feeding component, flue gas magnetization treatment device and zinc-containing dust enrichment component in the present invention work together to separate and enrich iron and zinc elements from steel dust mud. The flue gas magnetization treatment device uses magnetic separation to treat iron in the flue gas to separate it from the zinc-containing dust, which helps to improve the recovery purity of iron and zinc, so as to better recycle and utilize iron and zinc. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of a metallurgical dust sludge melting magnetization recovery system provided in an embodiment of the present invention Figure 1 ;

[0036] Figure 2A schematic diagram of a metallurgical dust sludge melting magnetization recovery system provided in an embodiment of the present invention Figure 2 ;

[0037] Figure 3 A schematic diagram of a metallurgical dust sludge melting magnetization recovery system provided in an embodiment of the present invention Figure 3 ;

[0038] Figure 4 It is a structural schematic diagram of a smelting reduction furnace in an embodiment of the present invention;

[0039] Figure 5 for Figure 4 Sectional view in the AA direction;

[0040] Figure 6 It is a structural schematic diagram of a metallurgical dust and mud conveying mechanism in an embodiment of the present invention;

[0041] Figure 7 It is a partial schematic diagram of a screw conveyor in an embodiment of the present invention;

[0042] Figure 8 It is a partial schematic diagram of the feeding screw in the embodiment of the present invention;

[0043] Fig. 9 It is a schematic diagram of the structure of the material leveling plate in the embodiment of the present invention;

[0044] Fig.10 It is a structural schematic diagram of a flue gas magnetization treatment device in an embodiment of the present invention;

[0045] Fig.11 for Fig.10 A partial enlarged view of the middle B part;

[0046] Fig.12 It is a structural schematic diagram of the baffle mechanism in the first housing in the embodiment of the present invention when it is in a cleaning state;

[0047] Fig.13 The structure of the second housing and the electromagnetic plate in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0048] Fig.14 The structure of the second housing and the electromagnetic plate in the embodiment of the present invention is shown in FIG. Figure 2 .

[0049] Description of reference numerals:

[0050] 1. A metallurgical dust and sludge melting magnetization recovery system;

[0051] 10. Smelting reduction furnace; 11. Smelting chamber; 12. Iron outlet; 13. Slag outlet; 14. Smoke outlet;

[0052] 20. Raw material feeding assembly; 21. Oxygen-enriched air conveying mechanism; 211. Air source; 212. Air pipeline; 213. Auxiliary air delivery pipe; 22. Metallurgical dust and mud conveying mechanism; 221. Screw conveyor; 2211. Conveying shell; 2212. Feeding screw; 2213. Scratching plate; 2214. Avoidance groove; 2215. U-shaped plate; 2216. Scratching rod; 222. Storage bin; 223. Intermediate material pipe; 23. Coke conveying mechanism; 31. First shell ; 311, first air inlet; 312, second air inlet; 313, first exhaust port; 32, baffle mechanism; 321, connecting plate; 322, second driving member; 323, telescopic plate; 324, elastic member; 41, second shell; 411, third air inlet; 412, second exhaust port; 413, discharge port; 42, electromagnetic plate; 50, zinc-containing dust enrichment component; 51, gravity settling chamber; 52, cyclone dust collector; 53, bag dust collector; 54, chimney; DETAILED DESCRIPTION

[0053] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0054] It should be noted that when an element is referred to as being "fixed to", "fixed" or "fixedly disposed" 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" or "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When an element is referred to as being "set to" or "disposed on" another element, it may be directly on the other element or there may be a central element. "Multiple" refers to two or more quantities. "At least one" refers to one or more quantities. "Several" refers to one or more quantities.

[0055] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0056] Please also read Figures 1 to 14 , the structure and working principle of a metallurgical dust and sludge melting magnetization recovery system 1 provided in an embodiment of the present invention are described below.

[0057] See also Figures 1 to 4 A metallurgical dust sludge melting magnetization recovery system 1 provided in an embodiment of the present invention includes a melting reduction furnace 10, a raw material feeding component 20, a flue gas magnetization treatment device and a zinc-containing dust enrichment component 50.

[0058] The smelting reduction furnace 10 has a smelting chamber 11, and the side walls of the smelting chamber 11 are provided with an iron outlet 12 and a slag outlet 13, and the top of the smelting reduction furnace 10 is provided with a smoke outlet 14; the discharge end of the raw material feeding assembly 20 is connected to the smelting chamber 11, and is used to add metallurgical dust, coke and oxygen-enriched air into the smelting chamber 11; the smoke magnetization treatment device includes a first shell 31, a second shell 41 and an electromagnetic plate 42, the first shell 31 has a reduction chamber, one end of the reduction chamber is provided with a first air inlet 311 and a second air inlet 312, and the other end is provided with a first exhaust port 313, the first air inlet 311 is connected to the smoke outlet 14, and the second air inlet 312 is connected to the gas transmission pipeline. The second housing 41 has a collecting chamber, one end of the collecting chamber is provided with a third air inlet 411, the other end is provided with a second exhaust port 412, the bottom of the collecting chamber is provided with a discharge port 413, the third air inlet 411 is connected to the first exhaust port 313, and the electromagnetic plate 42 is arranged in the collecting chamber. The zinc-containing dust enrichment assembly 50 is connected to the second exhaust port 412.

[0059] Compared with the prior art, the metallurgical dust sludge melting magnetization recovery system 1 provided by the embodiment of the present invention has the following beneficial effects:

[0060] A metallurgical dust sludge melting magnetization recovery system 1 provided in an embodiment of the present invention comprises a melting reduction furnace 10, a raw material feeding assembly 20, a flue gas magnetization treatment device and a zinc-containing dust enrichment assembly 50. The melting reduction furnace 10 adopts a pyrometallurgical enrichment method, the molten iron obtained by melting is discharged from the iron outlet 12, the slag is discharged from the slag outlet 13, and zinc enters the flue gas magnetization treatment device together with the flue gas, so that the preliminary separation and enrichment of iron, slag and zinc in the iron and zinc-containing steel dust sludge metallurgical solid waste can be achieved. The raw material feeding assembly 20 is used to transport metallurgical dust sludge solid waste, coke and oxygen-enriched air into the melting reduction furnace 10 to facilitate the reduction reaction in the melting reduction furnace 10. After the flue gas from the smelting reduction furnace 10 enters the flue gas magnetization treatment device, the coal gas comes into contact with the iron oxide (Fe2O3) in the flue gas, which can quickly reduce the Fe2O3 in the flue gas to Fe3O4, so that the weakly magnetic ferric oxide is converted into the strongly magnetic ferroferric oxide. Then the flue gas enters the second shell 41, the ferroferric oxide is collected by magnetic adsorption, and the zinc-containing dust is collected by the zinc-containing dust enrichment component 50, and finally, high-iron and low-zinc iron concentrate and zinc-rich dust are obtained, thereby realizing the separation and enrichment of iron and zinc in steel dust.

[0061] In the embodiment of the present invention, the smelting reduction furnace 10, the raw material feeding assembly 20, the flue gas magnetization treatment device and the zinc-containing dust enrichment assembly 50 work together to separate and enrich the iron and zinc elements from the steel dust. The flue gas magnetization treatment device can convert the weakly magnetic iron in the flue gas into strongly magnetic iron, and use magnetic separation to treat the iron in the flue gas to separate it from the zinc-containing dust, which helps to improve the recovery purity of iron and zinc, so as to better recycle and utilize iron and zinc.

[0062] The smelting reduction furnace 10 in the embodiment of the present invention is a smelting furnace equipment in the prior art, and its specific structure and working principle are not described in detail. The smelting reduction furnace 10 can continuously process dust and mud metallurgical solid waste containing iron and zinc (iron ≥ 40%, zinc 1.0-3.0%). When in the melting chamber 11, the iron element in the dust and mud solid waste is reduced to liquid iron under the action of coke, oxygen-rich air and high temperature. The liquid iron can be discharged through the iron outlet 12, and the slag floats above the molten iron and can be discharged through the slag outlet 13. Zinc oxide is reduced to zinc, and a small amount of iron oxide and most of the zinc enter the flue gas magnetization treatment device together with the flue gas from the flue gas outlet 14.

[0063] The raw material feeding assembly 20 is used to add metallurgical dust, coke and oxygen-enriched air into the melting chamber 11. When in use, the metallurgical dust solid waste can be made into sintered ore before being put into the furnace, or the powdered material can be directly transported into the furnace by pneumatic conveying equipment. Coke can be fed into the melting reduction furnace 10 by means of a screw feeder, a bucket feeder, pneumatic conveying, etc.

[0064] The flue gas magnetization treatment device includes two parts: a flue gas magnetization part and a magnetic separation part. The first shell 31 is used for flue gas magnetization, and the second shell 41 and the electromagnetic plate 42 are used for magnetic separation. The first shell 31 is connected to the gas delivery pipeline and the flue gas outlet 14. The gas delivery pipeline is used to introduce gas into the reduction chamber. The CO / (CO+CO2) ratio of the reduction gas in the flue gas magnetization device is controlled to be 20% to 40%, and the temperature of the reduction chamber is controlled to be 600-800°C. Fe2O3 in the flue gas can be quickly reduced to Fe3O4 (the reaction formula is: 3Fe2O3+CO=2Fe3O4+CO2). Through this process, the weak magnetic substance in the flue gas dust of the melting furnace will be converted into a strong magnetic substance. The magnetized flue gas enters the second shell 41 and the zinc-containing dust enrichment component 50 in turn. The electromagnetic plate 42 can adsorb iron, and the zinc-containing dust enrichment component 50 can collect zinc-containing dust, so that iron and zinc can be better separated and the purity of metal recovery can be improved.

[0065] In order to improve the heat recovery efficiency, the smelting reduction furnace 10 can also be equipped with a waste heat utilization system to utilize raw coal gas and high-temperature flue gas to generate electricity, so that the temperature of the raw coal gas and flue gas is reduced from 350°C to 150°C, thereby achieving waste heat power generation and reducing the flue gas temperature, which is convenient for flue gas treatment and zinc collection.

[0066] See also Figures 1 to 4In some possible embodiments, the raw material feeding assembly 20 includes an oxygen-enriched air conveying mechanism 21, a metallurgical dust and sludge conveying mechanism 22 and a coke conveying mechanism 23. The oxygen-enriched air conveying mechanism 21 includes an air source 211 and two air pipelines 212. The air inlet ends of the two air pipelines 212 are respectively connected to the air source 211, and the air outlet ends of the air pipelines 212 extend into the melting chamber 11; the discharge end of the metallurgical dust and sludge conveying mechanism 22 is connected to one of the air pipelines 212, and the discharge end of the coke conveying mechanism 23 is connected to the other of the air pipelines 212.

[0067] The metallurgical dust and coke used in this embodiment are both small particles or powder materials. The metallurgical dust is one or more of sintering electrostatic ash, steelmaking dust removal ash, steelmaking coarse ash, steelmaking fine ash, iron oxide, blast furnace environment ash, blast furnace gravity ash, blast furnace bag ash, etc., which are pre-mixed in a certain proportion. The gas source 211 uses compressed gas, and the metallurgical dust is transported to the corresponding gas pipeline 212 through the conveying mechanism metallurgical dust conveying mechanism 22, and is sent into the melting chamber 11 together with the oxygen-enriched air, eliminating the step of making sintered ore, and simplifying the process flow.

[0068] The coke is transported to another gas pipeline 212 through the discharge end of the coke conveying mechanism 23, and is sent into the melting chamber 11 together with the oxygen-enriched air. The coke conveying mechanism 23 may include a coke silo and a discharger. The discharger may be a screw feeder, a gate valve, a star-shaped discharge valve, etc., which can realize the discharge of powder materials.

[0069] It is understandable that a valve can be provided on the gas pipeline 212 as needed to control the on-off of the gas circuit.

[0070] See also Figure 3 , Figure 4 and Figure 5 In some possible embodiments, the oxygen-enriched air conveying mechanism 21 also includes a plurality of auxiliary air supply pipes 213, and the plurality of auxiliary air supply pipes 213 are arranged along the circumference of the smelting reduction furnace 10. The air inlet end of the auxiliary air supply pipe 213 is connected to the air source 211, and the air outlet end of the auxiliary air supply pipe 213 extends into the melting chamber 11. The air outlet direction of the plurality of auxiliary air supply pipes 213 is arranged along the tangential direction of the circumference.

[0071] In this embodiment, the oxygen-enriched air delivery mechanism 21 further includes a plurality of auxiliary air delivery pipes 213. Three, four or more auxiliary air delivery pipes 213 may be provided. Figure 5 As shown, the auxiliary air supply pipe 213 is arranged along the tangent in the circumferential direction and tilted downward at an appropriate angle. The height of the auxiliary air supply pipe 213 is higher than the height of the upper surface of the slag. When the auxiliary air supply pipe 213 delivers gas, it can cause eddy currents to be generated on the upper surface of the slag, which facilitates the uniform distribution of metallurgical dust and iron powder in the melting chamber 11, helps to complete the reaction, and improves the metal recovery rate.

[0072] See also Figure 6 , Figure 7 , Figure 8 and Fig. 9 In some possible embodiments, the metallurgical dust and sludge conveying mechanism 22 includes a screw conveyor 221, a plurality of storage bins 222 and an intermediate material pipe 223. The screw conveyor 221 is arranged above the corresponding gas pipeline 212; the plurality of storage bins 222 are respectively arranged on one side of the screw conveyor 221, and the discharge end of the storage bin 222 is connected to the feed end of the screw conveyor 221; the intermediate material pipe 223 is arranged vertically and is connected to the discharge end of the screw conveyor 221 and the corresponding gas pipeline 212.

[0073] In this embodiment, a plurality of storage bins 222 are used to store different materials (such as sintering electrostatic ash, blast furnace bag dust removal ash, etc.), and the materials are transported to the gas pipeline 212 through the screw conveyor 221 and the intermediate material pipe 223.

[0074] See also Figures 6 to 8 In some possible embodiments, the screw conveyor 221 includes a conveying shell 2211, a feeding screw 2212, a first driving member and a plurality of material leveling plates 2213. The conveying shell 2211 has a conveying trough with an opening at the top. The cross-section of the conveying trough perpendicular to its own axial direction is U-shaped, and the discharge end of the storage bin 222 is located above the conveying trough; the feeding screw 2212 includes a rotating shaft and a spiral blade, the rotating shaft rotates with the conveying shell 2211, the spiral blade is arranged on the rotating shaft, and the spiral blade is provided with a plurality of avoidance grooves 2214 along its own axial direction, and the avoidance grooves 2214 are arranged along the circumference of the spiral blade; the first driving member is arranged on the conveying shell 2211, and is used to drive the rotating shaft to rotate around its own axis; a plurality of material leveling plates 2213 are arranged in the conveying trough at intervals along the axial direction of the conveying trough, and the material leveling plates 2213 have a material passing hole that runs through its own thickness direction.

[0075] The screw conveyor 221 in the prior art can only convey materials along its own axis and cannot play a mixing role. However, in this embodiment, the metallurgical dust and sludge usually includes a variety of materials (such as steelmaking fine ash, iron oxide scale, blast furnace environmental ash, blast furnace gravity ash, reducing agent, etc.). Before entering the melting chamber 11, it is necessary to mix the various materials so that they enter the melting chamber 11 at a uniform speed according to a certain ratio.

[0076] In order to achieve the mixing function during feeding, this embodiment arranges an avoidance groove 2214 on the spiral blade, and arranges a leveling plate 2213 corresponding to the avoidance groove 2214 on the inner wall of the conveying groove. When the material is conveyed forward, the material will be blocked when passing through the leveling plate 2213 and thus mixed with the material behind. The multiple leveling plates 2213 arranged at intervals along the feeding direction work together to play the role of mixing the materials, thereby helping to mix various materials evenly, improving the reduction effect of metallurgical dust in the melting chamber 11, and helping to improve the recovery rate of zinc and iron.

[0077] See also Figure 7 and Fig. 9 In some possible embodiments, a receiving groove is provided at a position corresponding to the inner wall of the conveying trough and the avoidance groove 2214, and the material leveling plate 2213 includes a U-shaped plate 2215 and a plurality of material leveling rods 2216, and the U-shaped plate 2215 is arranged in the receiving groove; the plurality of material leveling rods 2216 are arranged along the circumference of the U-shaped plate 2215, one end of the material leveling rod 2216 is connected to the U-shaped plate 2215, and the other end extends into the conveying trough along the radial direction of the U-shaped plate 2215, and a material passing hole is formed between two adjacent material leveling rods 2216. In this embodiment, the material leveling plate 2213 includes a U-shaped plate 2215 and a plurality of material leveling rods 2216, and the U-shaped plate 2215 is arranged in the receiving groove, and the U-shaped plate 2215 fits with the inner wall of the conveying trough after installation, and does not hinder the material conveying, and the material leveling rods 2216 are round rods, which are convenient for the material to pass through, and the plurality of material leveling rods 2216 form material comb teeth, which can play a role in mixing the material when the material passes through.

[0078] In order to facilitate the full contact and reaction between coal gas and flue gas, so that iron oxide is converted into ferroferric oxide, please refer to Fig. 9 , Fig.10 and Fig.11In some possible embodiments, the first shell 31 is tubular, which may be a circular tube or a rectangular tube. A plurality of baffle mechanisms 32 are also provided in the first shell. The plurality of baffle mechanisms 32 are arranged in the reduction chamber at intervals along the length direction of the first shell 31. The baffle mechanisms 32 include a connecting plate 321, a second driving member 322, a telescopic plate 323 and an elastic member 324. The connecting plate 321 is arranged in the reduction chamber, and the connecting plate 321 includes a rotating part that rotates with the first shell 31, and two connecting parts extending radially along the rotating part. The two connecting parts are located in the same radial plane, and one of the connecting parts is provided with a slide groove at one end away from the rotating part. The shape and size of the connecting plate 321 correspond to the size of the reduction chamber, and the left and right sides of the connecting plate 321 are in sealing contact with the inner wall of the reduction chamber to avoid air leakage; the second driving member 322 is arranged in the first shell 31, and is used to drive the rotating part to rotate around the horizontal axis; the telescopic plate 323 is slidably matched with the slide groove; the elastic member 324 is arranged in the slide groove, and the two ends of the elastic member 324 are respectively connected to the connecting plate 321 and the telescopic plate 323, and are configured with a preload force that makes the end of the telescopic plate 323 extend out of the slide groove and abut against the inner wall of the reduction chamber. In order to prevent the telescopic plate 323 from detaching from the slide groove under the action of the preload force, a stopper or a limiting structure can be set at the opening of the slide groove. The baffle structure is rotatably arranged in the reduction chamber, and the interval between two adjacent baffle mechanisms 32 should be larger than the rotation diameter to ensure that there is no interference with each other.

[0079] In this embodiment, a plurality of deflection mechanisms 32 are arranged at intervals along the direction of smoke flow. Fig.11 As shown by the arrows, the telescopic plates 323 of two adjacent baffle mechanisms 32 are respectively in contact with the top wall and the bottom wall of the reduction chamber, so that the reduction chamber forms a tortuous baffle channel, so that the flue gas and the coal gas can fully contact and react. In order to control the temperature of the reduction chamber at 600-800°C, electric heating pipes and water cooling pipes can be buried in the inner wall of the reduction chamber to increase or decrease the temperature as needed.

[0080] like Fig.11 As mentioned above, since the flue gas contains iron oxide, ferroferric oxide and other particles, after long-term use, smoke and dust will accumulate in the baffle channel, resulting in poor air flow and requiring manual cleaning. To solve this problem, please refer to Fig.11 and Fig.12 In some possible embodiments, the baffle mechanism 32 has a working state and a cleaning state. When in the working state, the telescopic plates 323 of two adjacent baffle mechanisms 32 respectively abut against the top wall and the bottom wall of the reduction chamber, so that the reduction chamber forms a tortuous baffle channel; when in the cleaning state, the telescopic plates 323 of the baffle mechanism 32 all abut against the top wall of the reduction chamber, and are inclined at a preset angle to the axial direction of the reduction chamber (60° as shown in the figure, of course, it can also be other angles).

[0081] In this embodiment, the baffle mechanism 32 is rotatably arranged in the reduction chamber. During normal use, the telescopic plates 323 of two adjacent baffle mechanisms 32 are respectively in contact with the top wall and the bottom wall of the reduction chamber, so that the reduction chamber is formed as follows. Fig.11 When it is necessary to clean the dust inside, the corresponding baffle mechanism 32 is controlled to rotate by the second driving member 322 so that it switches to the following Fig.12 In the cleaning state shown in the figure, in the cleaning state, the upper part of the reduction chamber is closed by the telescopic plate 323, and the lower part of the reduction chamber forms a relatively narrow airflow channel, so that the air pressure is enhanced and the flue gas flow rate is accelerated, which can blow away the deposited smoke and dust, thereby achieving the purpose of automatic cleaning. After the cleaning is completed, the deflection mechanism 32 is controlled by the second driving member 322 to return to the working state.

[0082] See also Fig.13 and Fig.14 In some possible embodiments, a plurality of electromagnetic plates 42 are provided, and the plurality of electromagnetic plates 42 are arranged in the collection chamber at equal intervals. The electromagnetic plates 42 are parallel to the connecting direction of the third air inlet 411 and the second exhaust port 412, and the electromagnetic plates 42 can adsorb ferroferric oxide when the smoke passes through. In order to facilitate the collection of ferroferric oxide, a vibration mechanism can also be provided above the electromagnetic plate 42. The vibration mechanism can be a lifting hammer that can vertically exert a striking force on the electromagnetic plate 42 downward. When a certain amount is collected, the electromagnetic plate 42 is powered off and loses its magnetism, and the lifting hammer works. Under the action of gravity, the ferroferric oxide is vibrated to make the ferroferric oxide fall from the electromagnetic plate 42.

[0083] Alternatively, scrapers that can be raised and lowered can be provided on both side plates of the electromagnetic plate 42 , the scraper surface is in contact with the surface of the electromagnetic plate 42 , and the scraper is driven to rise and fall by a cylinder or the like, so as to scrape off the ferrous material adsorbed on the surface of the electromagnetic plate 42 .

[0084] See also Figure 1 In some possible embodiments, the zinc-containing dust enrichment component 50 includes a gravity settling chamber 51, a cyclone dust collector 52, a bag dust collector 53 and a chimney 54, which are arranged in sequence. The air inlet end of the gravity settling chamber 51 is connected to the second exhaust port 412. A blower arranged on the flue gas conveying pipeline is used to make the flue gas pass through the gravity settling chamber 51, the cyclone dust collector 52, the bag dust collector 53 and the chimney 54 in sequence to achieve the enrichment of zinc-containing dust. Among them, the gravity settling chamber 51, the cyclone dust collector 52, the bag dust collector 53 and the chimney 54 are all products in the prior art, and their specific models and specifications are not limited, as long as they can meet the use requirements.

[0085] It can be understood that the various parts in the above-mentioned embodiments can be freely combined or deleted to form different combination embodiments. The specific contents of each combination embodiment will not be repeated here. After this description, it can be considered that the specification of the present invention has recorded various combination embodiments and can support different combination embodiments.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A metallurgical dust and sludge melting magnetization recovery system, characterized in that: include: The smelting reduction furnace comprises a smelting chamber, the side wall of the smelting chamber is provided with an iron outlet and a slag outlet, and the top of the smelting reduction furnace is provided with a smoke outlet; A raw material feeding assembly, the discharge end of which is connected to the melting chamber, and is used to add metallurgical dust, coke and oxygen-enriched air into the melting chamber; The flue gas magnetization treatment device comprises a first shell, a second shell and an electromagnetic plate, wherein the first shell has a reduction chamber, one end of the reduction chamber is provided with a first air inlet and a second air inlet, and the other end is provided with a first exhaust port, the first air inlet is connected to the flue gas outlet, and the second air inlet is connected to a gas delivery pipeline; the second shell has a collection chamber, one end of the collection chamber is provided with a third air inlet, and the other end is provided with a second exhaust port, a discharge port is provided at the bottom of the collection chamber, the third air inlet is connected to the first exhaust port, and the electromagnetic plate is arranged in the collection chamber; as well as a zinc-containing dust enrichment component, connected to the second exhaust port, for collecting zinc-containing dust; The first shell is tubular, and a plurality of baffle mechanisms are provided in the first shell. The plurality of baffle mechanisms are arranged in the reduction chamber at intervals along the length direction of the first shell. The baffle mechanisms include: A connecting plate is arranged in the reduction chamber, the connecting plate comprises a rotating part rotatably matched with the first shell, and two connecting parts extending radially along the rotating part, the two connecting parts are located in the same radial plane, and one of the connecting parts is provided with a sliding groove at an end away from the rotating part; a second driving member, disposed on the first housing, and used to drive the rotating portion to rotate around an axis in a horizontal direction; A telescopic plate, slidably matched with the slide groove; An elastic member is disposed in the slide groove, two ends of the elastic member are respectively connected to the connecting plate and the telescopic plate, and is configured with a pre-tightening force that causes the end of the telescopic plate to extend out of the slide groove and abut against the inner wall of the reduction chamber; There are multiple electromagnetic plates, and the multiple electromagnetic plates are arranged in the collecting chamber at equal intervals. The electromagnetic plates are parallel to the connecting direction of the third air inlet and the second air outlet.

2. A metallurgical dust sludge melting magnetization recovery system according to claim 1, characterized in that: The raw material feeding assembly includes an oxygen-enriched air conveying mechanism, a metallurgical dust and mud conveying mechanism and a coke conveying mechanism, the oxygen-enriched air conveying mechanism includes an air source and two air pipelines, the air inlet ends of the two air pipelines are respectively connected to the air source, and the air outlet ends of the air pipelines extend into the melting chamber; The discharge end of the metallurgical dust conveying mechanism is communicated with one of the gas pipelines, and the discharge end of the coke conveying mechanism is communicated with another of the gas pipelines.

3. A metallurgical dust and sludge melting magnetization recovery system according to claim 2, characterized in that: The oxygen-enriched air conveying mechanism also includes a plurality of auxiliary air supply pipes, which are arranged along the circumference of the smelting reduction furnace, the air inlet ends of the auxiliary air supply pipes are connected to the air source, the air outlet ends of the auxiliary air supply pipes extend into the melting chamber, and the air outlet directions of the plurality of auxiliary air supply pipes are arranged along the tangent direction of the circumference.

4. A metallurgical dust sludge melting magnetization recovery system according to claim 2, characterized in that: The metallurgical dust and mud conveying mechanism comprises: A screw conveyor is arranged above the corresponding gas pipeline; A plurality of storage bins are respectively arranged on one side of the screw conveyor, wherein the discharge end of the storage bin is connected to the feed end of the screw conveyor; and an intermediate material pipe is connected to the discharge end of the screw conveyor and the corresponding gas pipeline.

5. A metallurgical dust and sludge melting magnetization recovery system according to claim 4, characterized in that: The screw conveyor comprises: A conveying shell having a conveying trough, the top of which is open, the cross section of which perpendicular to its own axis is U-shaped, and the discharge end of the storage bin is located above the conveying trough; A feeding screw, comprising a rotating shaft and a spiral blade, wherein the rotating shaft is rotatably matched with the conveying shell, the spiral blade is arranged on the rotating shaft, and the spiral blade is provided with a plurality of avoidance grooves along its axial direction, and the avoidance grooves are arranged along the circumference of the spiral blade; A first driving member is arranged in the conveying housing and is used to drive the rotating shaft to rotate around its own axis; and a plurality of material leveling plates are arranged in the conveying trough at intervals along the axial direction of the conveying trough, and the material leveling plates have material passing holes that penetrate through their own thickness direction.

6. A metallurgical dust sludge melting magnetization recovery system according to claim 5, characterized in that: The inner wall of the conveying trough is provided with a receiving groove at a position corresponding to the avoidance groove, and the material leveling plate includes: A U-shaped plate is arranged in the accommodating groove; and a plurality of material leveling rods are arranged along the circumference of the U-shaped plate, one end of the material leveling rod is connected to the U-shaped plate, and the other end extends into the conveying groove along the radial direction of the U-shaped plate, and the material passing hole is formed between two adjacent material leveling rods, and the material leveling plate is a round rod.

7. The metallurgical dust sludge melting magnetization recovery system according to claim 1, characterized in that: The baffle mechanism has a working state and a cleaning state. When in the working state, the telescopic plates of two adjacent baffle mechanisms respectively abut against the top wall and the bottom wall of the reduction chamber, so that the reduction chamber forms a tortuous baffle channel; When in the cleaning state, the telescopic plates of the deflection mechanism are all in contact with the top wall of the reduction chamber and are inclined at a preset angle to the axial direction of the reduction chamber.

8. The metallurgical dust sludge melting magnetization recovery system according to claim 1, characterized in that: The zinc-containing dust enrichment component comprises a gravity settling chamber, a cyclone dust collector, a bag dust collector and a chimney which are arranged in sequence, and the air inlet end of the gravity settling chamber is connected to the second exhaust port.

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