A high-efficiency, pollution-free and long-life copper alloy smelting furnace

Abstract

The present application relates to a kind of high-efficiency pollution-free long-life copper alloy smelting furnace, the induction furnace main body includes hearth, quartz sand furnace lining and electrical device, the quartz sand furnace lining is poured in the side wall and furnace bottom of induction furnace main body, the hearth is located in the upper portion of induction furnace main body, electrical device is located in the lower portion of induction furnace main body, the electrical device includes smelt ditch, the smelt ditch is externally provided with smelt ditch graphite protection cover, smelt ditch graphite protection cover is provided with smelt ditch placement groove corresponding smelt ditch, graphite brick is laid on the furnace bottom lining, the graphite brick is provided with opening, the side wall of the hearth of induction furnace main body is provided with graphite discharge valve.The present application can solve the problems of poor alloy quality, serious alloy pollution, poor copper liquid stirring capacity, large copper liquid temperature difference, unstable content, large waste, low production efficiency, high economic cost, short overall life of smelting furnace and the like in actual production.

Description

Technical Field

[0001] The invention discloses copper alloy smelting equipment, which relates to the technical field, and in particular to a high-efficiency, pollution-free, and long-life copper alloy smelting furnace. Background Art

[0002] In the copper alloy continuous casting upward induction furnace, when an alternating current is passed through the induction coil, an alternating magnetic flux is generated, which causes an induced electromotive force in the closed loop formed by the copper alloy charge. Under the action of this electromotive force, a strong induced current is generated, thereby heating and melting the charge.

[0003] The copper alloy continuous casting upward induction furnace has the following defects:

[0004] 1. The industrial frequency induction furnace process can refine high-stability alloys, but due to the long-term high temperature of smelting and the intense stirring of the molten copper in the molten copper channel, the entire molten copper in the furnace will be rapidly exchanged back and forth, which will intensify the heating shock and cause serious erosion of the quartz sand lining material. The eroded products are mixed into the copper liquid, and the alloy is contaminated. At the same time, the silicate in the quartz sand material is easy to react with the alloy at high temperature. The generated compounds adhere to the inner wall, bottom and molten copper channel of the furnace, reducing the induced current. To solve this problem, there have been reports in China on the protection of the lining of the molten copper channel (Patent 201220552464.X). A molten copper channel graphite protective sleeve is added to the molten copper channel lining. However, in actual use, it is found that because smelting is a closed-loop process, only the "feet" of the furnace body are currently protected, but not the "body" of the furnace body. The lining at the bottom of the furnace is not protected, which will cause serious wear of the molten copper channel graphite protective sleeve, shorten the overall life of the furnace, and fail to improve the quality of the alloy guide rod. If the furnace is newly opened, it needs to be kept warm for several days to sinter the quartz sand furnace lining before production can begin, and the sintering properties are difficult to control; all of the above will lead to a decrease in smelting efficiency, many quality defects in the upper alloy rod, and poor stability of the alloy content, which will eventually lead to the scrapping of the furnace and a short life.

[0005] 2. When the furnace is converted or shut down, the alloy copper liquid in the furnace must be drawn up and extracted. Only after the copper liquid is completely extracted can it be used to cast other alloy rod billets or shut down the furnace. Drawing the copper liquid from above leads to low work efficiency, large waste, large waste and high cost. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a high-efficiency, pollution-free and long-life copper alloy smelting furnace, which can solve the problems of poor quality of alloy guide rods, serious alloy contamination, poor stirring ability of copper liquid itself, large temperature difference of copper liquid, unstable content, large waste, low production efficiency, high economic cost and short overall furnace life in actual production.

[0007] The object of the present invention is achieved like this:

[0008] A high-efficiency, pollution-free, and long-life copper alloy smelting furnace, wherein the induction furnace main body comprises a furnace chamber, a quartz sand lining, and an electrical device. The quartz sand lining is cast on the side walls and furnace bottom of the induction furnace main body, the furnace chamber is arranged at the upper part of the induction furnace main body, and the electrical device is arranged at the lower part of the induction furnace main body. The electrical device comprises a melting groove, a melting groove graphite protective sleeve is provided outside the melting groove, and the melting groove graphite protective sleeve is provided with a melting groove placement groove corresponding to the melting groove. Graphite bricks are laid on the furnace bottom lining, and openings are provided on the graphite bricks. A graphite discharge valve is provided on the furnace chamber side wall of the induction furnace main body.

[0009] Preferably, the graphite bricks are laid on the furnace bottom lining using graphite cement.

[0010] Preferably, the size and position of the opening correspond to the size and position of the upper opening of the molten groove.

[0011] Preferably, forming bricks are provided in the main body of the induction furnace column. The forming bricks in the middle divide the furnace into three parts: a smelting chamber, a purification chamber and an insulation chamber. The outer sides of the forming bricks on both sides are in contact with the side fireplace lining, and the bottom of the forming bricks is in contact with the graphite bricks.

[0012] Preferably, the side fireplace lining of the quartz sand furnace lining is further provided with lightweight insulation bricks and chrome fiber blankets.

[0013] Preferably, the graphite unloading valve includes a valve stem, a valve bonnet and a locating pin, the valve bonnet sleeve is set at the bottom of the valve stem, the valve stem and the valve bonnet are connected by a locating pin, a groove is provided in the circumference of the valve stem corresponding to the locating pin, the valve stem head is provided with a handle, a first unloading hole is provided inside the valve stem, and a second unloading hole is provided on the valve bonnet, and the first unloading hole and the second unloading hole are both eccentric holes.

[0014] Preferably, the induction furnace body is provided with a steel sleeve corresponding to the graphite discharge valve, the steel sleeve is arranged at the side bottom of the furnace, the graphite discharge valve is installed in the steel sleeve, and the gap between the graphite discharge valve and the steel sleeve is filled with asbestos.

[0015] The beneficial effects of the present invention are:

[0016] 1. Graphite material has the characteristics that other materials cannot match, such as good heat transfer, high temperature resistance, good lubricity, acid and alkali resistance, strong chemical stability and small thermal expansion coefficient. It is also resistant to chemical corrosion and does not react easily with most metals. At high temperatures, the strength increases with increasing temperature, the thermal expansion coefficient is small, and the thermal stability and resistance to heating shock are very good. By setting the melting groove graphite protection sleeve and graphite bricks to protect the quartz sand of the furnace lining of the "furnace foot" and "furnace body" as a whole, there is no "floating sand" in the copper liquid, the wear of the melting groove graphite protection sleeve is reduced, the sintering of the furnace lining does not need to wait, the smelting efficiency is high, the upper alloy rod has few quality defects, the alloy is highly stable, the furnace life is long, economic costs are saved, and product quality and productivity are improved.

[0017] 2. The discharge valve made of graphite material is extremely convenient. There is no need to draw up the alloy copper liquid in the furnace for a long time when the furnace is converted or shut down, which avoids the scrapping of the extraction waste rod. The copper liquid in the furnace can be quickly cleaned through the discharge valve and can be fully reused. It has high efficiency, small waste, low waste, and greatly saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 Schematic diagram of the structure of the melting groove graphite protection sleeve.

[0020] Figure 3 This is the structural principle diagram of the graphite discharge valve.

[0021] Among them: quartz sand furnace lining 1; formed bricks 2; lightweight insulation bricks 3; chrome fiber blanket 4; induction furnace body 5; graphite bricks 6; opening 7; melting channel graphite protection sleeve 8; induction coil 9; water jacket 10; melting channel 11; U-shaped iron core 12; support platform 13; smelting chamber 14; purification chamber 15; insulation chamber 16; discharge valve 17; valve stem 17.1; valve cap 17.2; positioning pin 17.3; groove 17.4; handle 17.5; first discharge hole 17.6; second discharge hole 17.7; steel sleeve 18; asbestos 19. DETAILED DESCRIPTION

[0022] See also Figure 1-3 The present invention relates to a high-efficiency, pollution-free, and long-life copper alloy smelting furnace, which includes an induction furnace body 5, a discharge valve 17, and a support platform 13. The induction furnace body 5 includes a furnace, a quartz sand lining 1, and an electrical device. The quartz sand lining 1 is cast on the side walls and the bottom of the induction furnace body 5. The furnace is arranged at the upper part of the induction furnace body 5, and the electrical device is arranged at the lower part of the induction furnace body 5. The electrical device includes an induction coil 9, a water jacket 10, a melting groove 11, and a square iron core 12. The melting groove 11, the water jacket 10, and the induction coil 9 are arranged in sequence from the outside to the inside in the furnace bottom lining, and the square iron core 12 is arranged outside the furnace bottom lining.

[0023] A melting groove graphite protective sleeve 8 is provided outside the melting groove 11 to protect the melting groove. The melting groove graphite protective sleeve 8 is provided with a melting groove placement groove corresponding to the melting groove 11. The melting groove is made of an oxygen-free copper rod.

[0024] Graphite bricks 6 are laid on the furnace bottom lining, and openings 7 are provided on the graphite bricks 6. The graphite bricks 6 are laid on the furnace bottom lining using graphite cement. The size and position of the openings 7 correspond to the size and position of the upper opening of the melting groove. The graphite bricks 6 protect the furnace body.

[0025] The molding bricks 2 in the middle divide the furnace into three parts: a smelting chamber 14, a purification chamber 15 and an insulation chamber 16. The smelting chamber 14, the purification chamber 15 and the insulation chamber 16 are interconnected. The outer sides of the molding bricks 2 on both sides are in contact with the side fireplace lining, and the bottom of the molding bricks 2 is in contact with the graphite bricks 6.

[0026] The side fireplace lining is further provided with light insulation bricks 3 and chrome fiber blankets 4, which have a good insulation effect.

[0027] The graphite discharge valve 17 is arranged on the side wall of the furnace of the induction furnace body 5. The graphite discharge valve 17 includes a valve stem 17.1, a valve cap 17.2 and a positioning pin 17.3. The valve stem 17.1, the valve cap 17.2 and the positioning pin 17.3 are all made of graphite material. The valve cap 17.2 is set on the bottom of the valve stem 17.1. The valve stem 17.1 and the valve cap 17.2 are connected by the positioning pin 17.3. The valve stem 17.1 is provided with a groove 17.4 corresponding to the positioning pin 17.3 in the circumference. The head of the valve stem 17.1 is provided with a groove 17.4. A handle 17.5 is provided, a first discharge hole 17.6 is provided inside the valve stem 17.1, and a second discharge hole 17.7 is provided on the valve cap 17.2. The first discharge hole 17.6 and the second discharge hole 17.7 are both eccentric holes. When unloading is required, the handle 17.5 is turned to connect the first discharge hole 17.6 and the second discharge hole 17.7, and the graphite unloading valve is opened; when unloading is not required, the handle 17.5 is turned to block the first discharge hole 17.6 and the second discharge hole 17.7, and the graphite unloading valve is closed.

[0028] The induction furnace body 5 is provided with a steel sleeve 18 corresponding to the graphite discharge valve 17. The steel sleeve 18 is arranged at the side bottom of the furnace. The graphite discharge valve 17 is installed in the steel sleeve 18. The head of the valve stem 17.1 extends out of the furnace. The gap between the graphite discharge valve 17 and the steel sleeve 18 is filled with asbestos 19.

[0029] The steel sleeve 18 is cast on the side wall of the quartz sand furnace lining 1, and the head of the valve stem 17.1 passes through the lightweight insulation brick 3 and the chrome fiber blanket 4 in sequence and then extends out of the induction furnace body 5.

[0030] The support platform 13 is provided with a bottom plate and supporting legs, and the bottom plate supports the induction furnace body 5.

[0031] Here's how it works:

[0032] 1. The induction furnace is set to a rectangular shape. When the whole piece of electrolytic copper is added, the heat dissipation area of ​​the furnace is not increased. The area is divided into smelting area, insulation area and purification area. When building the furnace, high-purity graphite protective material is set on the quartz sand lining. Graphite bricks are first laid on the bottom lining of the furnace with graphite cement and a melting groove is opened. The melting groove is equipped with a melting groove graphite protective sleeve, and then shaped bricks are laid on the graphite bricks. This can reinforce the graphite bricks and divide the furnace into zones at the same time. After adding high-purity electrolytic copper into the smelting zone, the charge is affected by the induced current and the alternating electromagnetic field. The intense stirring inside the molten groove drives the temperature exchange of the copper liquid, generating eddy current heating and melting. The molten copper liquid slowly flows into the purification zone, which is not only conducive to the stability of the temperature and liquid level, but also the copper liquid can be fully reduced in the purification zone. It is also relatively easy to remove impurities in the purification zone to ensure that the temperature of the copper liquid entering the insulation is uniform and free of impurities. The copper liquid in the insulation zone is covered with natural graphite flakes, which is mainly used to isolate oxygen. The temperature of the copper liquid in the insulation zone is measured by a ceramic silver thermocouple, and the temperature of the copper liquid is controlled by adjusting the input power of the induction coil of the furnace.

[0033] 2. The discharge valve made of graphite material is placed in the steel sleeve at the side bottom of the insulation furnace of the induction furnace body. The gap between the graphite valve and the steel sleeve is filled with asbestos. The steel sleeve protects the graphite valve and facilitates the discharge operation. The gap filled with asbestos prevents the graphite valve from breaking due to the high temperature thermal expansion of graphite. The positioning pin is inserted into the rectangular groove to connect the valve stem and the valve cap. By turning the handle of the valve stem, the valve stem orifice is aligned with the valve cap orifice, thereby allowing the alloy copper liquid to pass through, or, depending on the situation, not allowing it to pass through.

[0034] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

[0035] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. An efficient, pollution-free, and long-life copper alloy smelting furnace, wherein the induction furnace body (5) comprises a furnace chamber, a quartz sand lining (1), and an electrical device, wherein the quartz sand lining (1) is cast on the side walls and the bottom of the induction furnace body (5), the furnace chamber is arranged on the upper part of the induction furnace body (5), and the electrical device is arranged on the lower part of the induction furnace body (5), wherein the electrical device comprises a melting groove (11), and wherein the induction furnace body (5) comprises a quartz sand lining (11), wherein the quartz sand lining (1) is cast on the side walls and the bottom of the induction furnace body (5), the furnace chamber is arranged on the upper part of the induction furnace body (5), and the electrical device is arranged on the lower part of the induction furnace body (5), and the electrical device comprises a melting groove (11), and wherein the induction furnace body (5) comprises a quartz sand lining (11), and wherein the in A melting groove graphite protective sleeve (8) is provided outside the melting groove (11), and a melting groove placement groove is provided on the melting groove graphite protective sleeve (8) corresponding to the melting groove (11); graphite bricks (6) are laid on the furnace bottom lining, and openings (7) are provided on the graphite bricks (6); and a graphite discharge valve (17) is provided on the side wall of the furnace chamber of the induction furnace body (5); The graphite discharge valve (17) comprises a valve stem (17.1), a valve cap (17.2) and a positioning pin (17.3); the valve cap (17.2) is sleeved on the bottom of the valve stem (17.1); the valve stem (17.1) and the valve cap (17.2) are connected via the positioning pin (17.3); a groove (17.4) is provided on the valve stem (17.1) in a circumferential direction corresponding to the positioning pin (17.3); a handle (17.5) is provided on the head of the valve stem (17.1); a first discharge hole (17.6) is provided inside the valve stem (17.1); a second discharge hole (17.7) is provided on the valve cap (17.2); and both the first discharge hole (17.6) and the second discharge hole (17.7) are eccentric holes; The induction furnace body (5) is provided with a steel sleeve (18) corresponding to the graphite discharge valve (17), the steel sleeve (18) is arranged at the side bottom of the furnace, the graphite discharge valve (17) is installed in the steel sleeve (18), and the gap between the graphite discharge valve (17) and the steel sleeve (18) is filled with asbestos (19).

2. The high-efficiency, pollution-free, long-life copper alloy smelting furnace according to claim 1, characterized in that: Graphite bricks (6) are laid on the furnace bottom lining using graphite cement.

3. The high-efficiency, pollution-free, long-life copper alloy smelting furnace according to claim 1, characterized in that: The size and position of the opening (7) correspond to the size and position of the upper opening of the melting groove.

4. The high-efficiency, pollution-free, long-life copper alloy smelting furnace according to claim 1, characterized in that: The induction furnace column body (5) is provided with molding bricks (2). The molding bricks (2) in the middle divide the furnace into three parts: a smelting chamber (14), a purification chamber (15) and a heat preservation chamber (16). The outer sides of the molding bricks (2) on both sides are in contact with the side fireplace lining, and the bottom of the molding bricks 2 is in contact with the graphite bricks (6).

5. The high-efficiency, pollution-free, long-life copper alloy smelting furnace according to claim 1, characterized in that: The side fireplace lining of the quartz sand furnace lining (1) is further provided with lightweight insulation bricks (3) and chrome fiber blankets (4).

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