Metal melting and pouring system

Abstract

The present invention relates to a metal smelting pouring system. It comprises a pouring device and a furnace door device of a smelting furnace, wherein the pouring device comprises an input flow channel connected to the smelting furnace, the input flow channel is connected to a buffer tank, the furnace door device of the smelting furnace comprises a furnace door and a furnace door moving device, the furnace door comprises an outer frame edge, a mesh skeleton refractory material casting layer arranged in the outer frame edge, and a full refractory material casting layer, and the furnace door moving device comprises a lifting rope connected between the furnace door and the furnace door driver. The metal smelting pouring system has a reasonable structure, and its quality of conveying casting liquid is good, which improves the ingot recovery quality of recycled aluminum.

Description

Technical Field

[0001] The invention relates to a secondary metal recovery system, and in particular to a metal smelting and pouring system. Background Art

[0002] A characteristic of the smelting and recycling of recycled metals, including recycled aluminum, is that the smelting liquid contains a large amount of sintered ash and impurities of particularly large differences in weight, thickness and fineness. When the impurities are not completely removed, it affects the quality of the recycled metal ingots. In severe cases, the ingots are like tofu dregs when reused and cannot be used normally. Other factors that affect the quality of the ingots include oxidation problems during the transportation of the smelting liquid, temperature changes of the metal smelting liquid, etc. Since there is a long gap between the smelting of recycled metals and the pouring of ingots, the transportation of the smelting liquid is also a key and important process link in order to obtain good ingot quality. Due to the particularity of recycling metal molten liquid, there are certain technical limitations in purifying or filtering it both in terms of technology and equipment. The existing metal recycling smelting ingot includes a conveying device such as an input flow channel. Due to the unreasonable structure and corresponding conveying method, it is difficult to have an effective impurity removal function. At the same time, due to its long-distance transportation, a layer of oxide scale formed on the surface of the casting liquid due to cooling and oxidation by the ambient air when flowing through the input flow channel is brought into the mold together, and a large amount of bubbles and residues are entrained in the casting liquid, which makes the surface of the ingot rough on the one hand, and on the other hand, its residue may form a residue layer similar to tofu dregs on the surface of the ingot. The temperature change of the metal molten liquid transported over a long distance due to cooling by the ambient air, etc., will affect the smelting recovery efficiency and the quality of the ingot. When the transportation distance is long, secondary heating may be required. Summary of the invention

[0003] The purpose of the present invention is to provide a metal smelting and pouring system to address the deficiencies of the prior art. The metal smelting and pouring system has a reasonable structure, has good quality of conveying casting liquid, and improves the quality of recycled aluminum ingot recovery.

[0004] The technical solution of the metal smelting and pouring system of the present invention includes a pouring device and a furnace door device of a smelting furnace, wherein the pouring device includes an input flow channel connected to the smelting furnace, and the input flow channel is connected to a buffer tank. The furnace door device of the smelting furnace includes a furnace door and a furnace door moving device. The furnace door includes an outer frame edge, a mesh skeleton refractory material casting layer arranged in the outer frame edge, and a full refractory material casting layer. The furnace door moving device includes a lifting cable connected between the furnace door and the furnace door driver.

[0005] The output port of the reflux purification pit is arranged on a side biased towards the input side thereof.

[0006] The metal smelting and pouring system of the present invention not only has a reasonable structure, but also has a relatively better metal molten liquid conveying and processing function with a particularly reasonable conveying and processing method, and obtains a better processing effect. It can truly avoid the influence of entrained bubbles, oxide layers, residues and related impurities on the quality of ingot products; and it can maintain or reduce the influence of the external environment on the temperature of the molten liquid to better ensure the quality of the ingot. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic structural diagram of an embodiment of a metal melting and pouring system of the present invention; Figure 2 It is a structural schematic diagram of an embodiment of a furnace door of a metal smelting and pouring system of the present invention; Figure 3 for Figure 2 Schematic diagram of the structure of the lower mesh skeleton refractory material casting layer of the furnace door; Figure 4 This is a structural schematic diagram of an embodiment of a furnace door moving device of a metal smelting and pouring system; Figure 5 This is a structural schematic diagram of Embodiment 2 of the pouring device of the metal smelting pouring system; Figure 6 This is a schematic structural diagram of Embodiment 3 of the pouring device of the metal smelting pouring system; Figure 7 It is a schematic diagram of the structure of pouring device type embodiment 4; Figure 8 This is a schematic structural diagram of Example 5 of the unified pouring device; Fig. 9 This is a schematic structural diagram of Example 6 of the unified pouring device. DETAILED DESCRIPTION

[0008] In order to further understand the technical solution of the present invention, the present invention is further described by the following embodiments in conjunction with the accompanying drawings. Figure 1-4 As shown, the metal smelting pouring system includes an inclined input flow channel 1 and a buffer tank 2 connected to the corresponding soup outlet (molten liquid outlet) of the smelting furnace. The bottom wall of the smelting furnace is provided with an inclined wall from the soup outlet and / or the slag removal outlet to the bottom wall of the furnace.

[0009] A plurality of turbulent purification pits 3a are arranged at intervals along the length direction on the bottom wall of the input flow channel 1. A reflux purification pit 5 connected to the output port of the input flow channel is arranged at the output end of the input flow channel, and the buffer tank 2 is connected to the output port 11 of the reflux purification pit 5. The cross-sectional shape of the input flow channel is rectangular or an inverted isosceles trapezoid with a small gradient, and its depth is 3-5 times the width of the bottom surface. The input flow channel is arranged with a large depth-to-width ratio, that is, the input flow channel is narrower and deeper, and a good insulation effect can be obtained. Energy consumption is saved.

[0010] The outflow side of the corresponding turbulent purification pit of the input flow channel is connected with a self-cleaning ceramic filter screen plate 4a inclined toward the inflow side. The number of self-cleaning ceramic filter screen plates 4a can be set according to the quality of the smelting liquid (fluid) and the purification degree requirements.

[0011] The bottom walls of the reflux purification pit 5 and the turbulent flow purification pit 3a are inclined downward along the flow direction of the input flow channel and against the flow direction of the input flow channel respectively. The turbulent flow purification pit is a quadrilateral turbulent flow purification pit whose bottom edge is inclined in the direction of the side wall of the input flow channel.

[0012] The middle part of the bottom wall of the reflux purification pit 5 is arranged to be convex upward to a certain height on the input side, and the output port 11 of the reflux purification pit is opened at a convex part of the convexity of a certain height on the bottom wall of the reflux purification pit; that is, the output port 11 of the reflux purification pit is located on the input side of the reflux purification pit and higher than the bottom wall of the reflux purification pit, and the convex peripheral wall around the output port of the reflux purification pit forms the neck 12 of the input port of the buffer groove 2a. The output port of the reflux purification pit is lower than the bottom wall of the output end of the input flow channel. The output port of the reflux purification pit is located on the input side of the reflux purification pit to extend the reflux flow channel, which can obtain a better purification effect under certain conveying device conditions.

[0013] A pouring port for conveying to the pouring ingot is provided at the bottom of the buffer tank 2, and a corresponding conical control valve 13 is provided at the pouring port. A ceramic filter screen 4b is provided at the input port of the buffer tank (the output port of the reflux purification pit 5). A transition hole 17 corresponding to the valve stem of the corresponding control valve is provided on the ceramic filter screen. The valve stem of the control valve passes through the ceramic filter screen through the transition hole to the top of the reflux purification pit. The valve core of the conical control valve 13 is conical. A slag discharge port is provided at the lowest point on the corresponding side of the reflux purification pit.

[0014] The reflux purification pit 5 and the turbulent flow purification pit 3a respectively have very good functions of removing bubbles, air and sediments in the liquid and preventing the surface oxidation of the fluid, etc. The purification effect is particularly good.

[0015] The metal smelting and pouring system of the present invention has a conveying and purification mode in which a turbulent flow purification pit and a reflux purification pit are respectively arranged at the main input section of the input flow channel and the output end. When the fluid flows through the turbulent flow purification pit, the residual impurities and exhaust gas can be settled and purified by the turbulent flow mode; at the same time, when the fluid flows to the output end of the input flow channel and touches the intercepting side wall of the reflux purification pit, it has the corresponding flow characteristics of reflux from bottom to top, and the residual impurities are retained at the bottom of the reflux purification pit during the reflux conveying process, and the bubbles in the fluid are released. The purified fluid is conveyed to the buffer tank, filtered and purified by the ceramic filter plate, and then sent to the ingot through the control valve.

[0016] Its disturbance flow purification pit and reflux purification pit disturbance conveying method can, on the one hand, collect the residual impurities in the liquid, and on the other hand, remove the bubbles entrained in the liquid. At the same time, it can also effectively prevent the liquid on the surface of the input flow channel from staying on the surface for a long time and contacting the air to be oxidized and form corresponding new impurities. It has a very good conveying and purification effect. In particular, it uses a self-cleaning ceramic filter plate connected to the output side of the disturbance flow purification pit. In the filtration process, it uses an inclined setting structure and combines the fluid reflux characteristics. It has the function of vertical and horizontal flushing and self-weight falling to automatically clean up the residue, which can achieve a very good purification effect.

[0017] The furnace door device of the smelting furnace of the present system includes a furnace door 21 and a furnace door moving device arranged at the corresponding furnace mouth of the smelting furnace 20, and the furnace door includes an outer frame edge 25, a mesh frame refractory material casting layer 22 respectively connected to the inner side of the outer frame, and a full refractory material casting layer 24. The mesh frame refractory material casting layer 22 is composed of a mesh frame 23 and a refractory material casting part 22 cast in the mesh of the mesh frame, and the full refractory material casting layer 24 is composed of a refractory material casting body.

[0018] The outer frame edge 25 and the mesh frame 23 are integrally formed by casting stainless steel, and the refractory material casting part of the mesh frame refractory material casting layer and the full refractory material casting layer are integrally cast by casting corresponding refractory materials.

[0019] During production, the outer frame and mesh frame are first cast into one piece with stainless steel through a mold of corresponding shape, and then the cast one-piece outer frame and mesh frame are used as a mold frame and / or the frame is cast with corresponding refractory materials to form a smelting furnace. The refractory material is a membrane stone material. The thickness of the mesh frame refractory material casting layer and its mesh frame is the same as that of the full refractory material casting layer.

[0020] The furnace door moving device includes a lifting cable connected between the furnace door 21 and the furnace door driver. The furnace door lifting cable includes a chain 27 connected to the driver, and a steel bar or steel plate 26 located in the furnace mouth area of ​​the smelting furnace, or when the furnace door is fully operated, located between the sprocket of the driver on the furnace door side and the furnace door, and connected to the furnace door and the chain 27. That is, the part of the lifting cable at the end close to the furnace door of the smelting furnace, which is never connected to the sprocket of the driver during operation, is composed of a steel bar or steel plate.

[0021] The driver includes a driving motor or hydraulic motor 29, a sprocket shaft 34 which is connected to the driving motor or hydraulic motor and has corresponding sprockets at both ends, and a corresponding tractor. The driving motor or hydraulic motor 29 and the sprocket shaft 34 are arranged above the furnace door or on the top of the smelting furnace.

[0022] One end of the two chains is connected to one end of the corresponding two steel bars or steel plates 26, and the other end of the steel bars or steel plates 26 is connected to the furnace door through the corresponding connecting ring. The other ends of the two chains are connected to the tractor, which includes a guide roller shaft 33 and a gravity drop (or gravity hammer) 31 connected to the other ends of the two chains. The sprocket shaft 34 is set on the side of the tractor close to the furnace door, and the chain is pulled by the tractor after being connected through the sprocket transmission.

[0023] A safety cable 28 is also connected between the furnace door and the furnace door driver. The safety cable is a steel wire rope with one end connected to the furnace door through a connecting ring 32 and the other end connected to the sprocket shaft of the furnace door driver.

[0024] The furnace door has a scientific and reasonable special structural shape with a diamond skeleton structure and refractory filling on one side and full refractory material on the other side. It has both high strength and special high temperature resistance and high strength characteristics. The mesh shape of the mesh skeleton of the mesh skeleton refractory material casting layer is diamond, which can obtain better frame structure stability and further improve the mechanical strength of the furnace door.

[0025] By adopting a structure in which the part of the lifting cable connected to the furnace door, located in the area on one side of the furnace mouth of the smelting furnace, in the full stroke of the furnace door being fully opened and raised, and located between the sprocket of the driver and the furnace door (the corresponding section) is composed of steel bars or steel plates, the reliability, safety and service life of the lifting cable can be avoided or reduced due to the relatively frequent operation and relatively higher temperature in the furnace door area of ​​the smelting furnace. Compared with the existing fully movable hinged connection structure of the chain, it does not have the connection reliability problem that is easy to occur in the movable connection structure and the movable connection method. It not only has good high temperature resistance, but also has stronger mechanism strength and tolerance to frequent operation force, which can greatly improve the service life and safety reliability of the entire lifting cable.

[0026] Example 2 Figure 5 As shown, the inlet of the buffer tank (the outlet of the reflux purification pit 5) is not provided with a ceramic filter screen. The remaining structures and corresponding purification treatment methods of this example are similar to those of the above-mentioned embodiment.

[0027] Example 3 Figure 6 As shown. The buffer tank 2 is connected to a pouring tank 9, and the output port of the buffer tank 2 is a dark flow wide-mouth output port 6 arranged on the side wall of one side of the pouring tank. The dark flow wide-mouth output port is provided with a dark flow purification device composed of an anti-oxidation isolation baffle 7 and a sedimentation baffle 8. The dark flow wide-mouth output port is a rectangular opening whose width is equal to the side wall of the corresponding side of the pouring tank (the output port side). The anti-oxidation isolation baffle 7 and the sedimentation baffle 8 are respectively composed of the upper and lower side walls of the rectangular opening.

[0028] The anti-oxidation isolation baffle 7 isolates the buffer tank from the pouring tank gas phase. The deposition baffle is slightly higher than the bottom wall of the buffer tank. The flow disturbance purification pit is a semi-blind chamber flow disturbance purification pit 3b extending obliquely along the lower side of the input flow channel and the input direction of the input flow channel.

[0029] The pouring and conveying control method is as follows: the control valve 13 controls the liquid level 10 of the pouring trough 9 to be higher than the lower end surface of the anti-oxidation isolation baffle 7 by a certain height, so as to convey the molten liquid to cast the ingot. The height is based on the requirement that a stable protective film layer can be formed on the surface of the pouring trough during the pouring process.

[0030] Its anti-oxidation isolation baffle 7 can prevent air from entering the purification tank 2, and play a very good role in preventing oxidation and weakly disturbing the liquid in the purification tank 2 and the casting tank 9 to release the residual bubbles trapped in the metal molten liquid. It can further purify the gas and residue in the liquid through the dark flow wide-mouth output port, making the molten casting liquid purer. The control valve is set on the bottom wall of the casting tank, and the casting liquid is transported from the bottom outlet of the casting tank to the casting ingot.

[0031] By controlling the liquid level of the pouring tank to submerge the lower end of the anti-oxidation isolation baffle, a stable oxide film layer can be formed on the surface of the molten liquid in the pouring tank, so that the molten liquid delivered to the mold ingot is always purified liquid below the surface oxide film layer, further effectively improving its casting quality. The deposition baffle 1 can isolate the precipitated residue impurities that may be accumulated in the buffer tank, and can cooperate with the anti-oxidation isolation baffle to implement weak turbulence. The remaining structures and corresponding purification treatment methods of this example can be similar to any of the above embodiments.

[0032] In Example 4, Figure 7 As shown, the bottom wall of the reflux purification pit is wavy, and the output port of the reflux purification pit 5 is arranged on the corresponding wave crest 15 of the wavy bottom wall of the reflux purification pit, and a ceramic filter screen plate 4b is arranged on the wave crest output port of the reflux purification pit. An inertial flow-following device 16 is arranged on the bottom wall of the output end (output port) of the input flow channel, and the inertial flow-following device is composed of a protrusion extending from the bottom wall of the output port of the input flow channel along the direction of the reflux purification pit with the original inclination of the bottom plate of the input flow channel. The intercepting side wall 14 of the reflux purification pit facing the input direction of the input flow channel is provided with an extended reflux wall inclined in the opposite direction of the input flow channel. It serves to expand the reflux path of the fluid and suppress the sedimentation of the slag and impurities mixed in it. The remaining structures and corresponding purification treatment methods of this example are similar to any of the above-mentioned embodiments.

[0033] In Example 5, Figure 8As shown, the inertial flow-free device is composed of an inclined plate connected to the bottom wall of the output port of the input flow channel and extending upward and obliquely. The bottom wall width of the spoiler purification pit 3a is the same as or greater than the corresponding bottom wall width of the input flow channel. The remaining structures and corresponding purification treatment methods of this example are similar to any of the above embodiments.

[0034] In Example 6, Fig. 9 As shown, the bottom wall of the reflux purification pit 5 is in a wave shape or a hill shape, and the output port of the reflux purification pit is arranged on the top side of the slope 35 on the side of the intercepting side wall 14 of the reflux purification pit in the wave shape or the hill shape. A filter mesh plate can be arranged on the output port of the reflux purification pit. The liquid purification rate of the reflux purification pit transported to the buffer tank or the casting mold is extremely high. The remaining structures and corresponding purification treatment methods of this example are similar to any of the above-mentioned embodiments.

[0035] In Example 7, the metal smelting and pouring system includes an inclined input flow channel 1 and a buffer tank 2 connected to the corresponding smelting furnace. A plurality of turbulent purification pits are arranged at intervals along the length direction on the bottom wall of the input flow channel 1, and the buffer tank input port is connected to the output port of the input flow channel 1. A pouring port for conveying to the pouring ingot is opened at the bottom of the buffer tank 2, and a corresponding conical control valve is provided at the pouring port. The valve core of the conical control valve is conical.

[0036] The outflow side of the corresponding turbulent purification pit of the input flow channel is connected with a self-cleaning ceramic filter screen plate inclined toward the inflow side. The number of self-cleaning ceramic filter screen plates can be set according to the quality of the smelting liquid (fluid) and the purification degree requirements. One can also be set.

[0037] In Example 8, the width of the upper port of the spoiler purification pit is greater than or equal to the bottom width of the input flow channel and less than or equal to the maximum width of the input flow channel. The bottom of the reflux purification pit 5 and the spoiler purification pit are respectively provided with a slag discharge port. The remaining structure and corresponding purification treatment method of this example are similar to any of the above embodiments.

[0038] In Example 9, the width of the reflux purification pit is greater than or equal to the maximum width of the input flow channel. The length of the reflux purification pit is greater than or equal to the maximum width of the input flow channel. The reflux purification pit can be rectangular. The output port of the reflux purification pit is provided with a ceramic filter screen, and the output port of the reflux purification pit is higher than the bottom wall surface of the output end of the input flow channel. The remaining structures and corresponding purification treatment methods of this example are similar to any of the above-mentioned embodiments.

Claims

1. A metal smelting pouring system, comprising a pouring device and a furnace door device of a smelting furnace, wherein the pouring device comprises an input flow channel connected to the smelting furnace, and is characterized in that The input flow channel is connected to a buffer tank, the furnace door device of the smelting furnace includes a furnace door and a furnace door moving device, the furnace door includes an outer frame edge, a mesh skeleton refractory material casting layer arranged in the outer frame edge, and a full refractory material casting layer, and the furnace door moving device includes a lifting cable connected between the furnace door and the furnace door driver; The mesh skeleton refractory material casting layer is composed of a mesh skeleton and a refractory material casting part cast in the meshes of the mesh skeleton; The full refractory casting layer is composed of a refractory casting body; Its outer frame edge and mesh frame are cast in one piece by stainless steel, and the refractory material casting part of the mesh frame refractory material casting layer and the full refractory material casting layer are cast in one piece by corresponding refractory materials; A plurality of turbulent purification pits are provided on the bottom wall of the input flow channel at intervals along the length direction thereof, a reflux purification pit connected to the output port of the input flow channel is provided at the output end of the input flow channel, and the buffer tank is connected to the output port of the reflux purification pit; The outflow side of the corresponding turbulent purification pit of the input flow channel is connected with a self-cleaning ceramic filter screen plate inclined toward the inflow side; The bottom walls of the reflux purification pit and the turbulent flow purification pit are inclined downward along the flow direction of the input flow channel and against the flow direction of the input flow channel respectively. The turbulent flow purification pit is a quadrilateral turbulent flow purification pit whose bottom edge is inclined in the direction of the side wall of the input flow channel.

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