JP4282969B2 - Melting furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a melting furnace used in a casting process in which a zinc cathode obtained by electrolytic smelting of zinc is melted into an ingot.
[0002]
[Prior art]
A zinc cathode obtained by electrolytic smelting of zinc is melted in a melting furnace and cast into a zinc ingot, and this ingot is used as a raw material for various applications.
[0003]
When the zinc cathode is melted in a melting furnace, a flux (NH ₄ Cl or the like) is added for the purpose of easily dissolving the zinc cathode in the molten metal. The added flux (NH ₄ Cl or the like) is combined with zinc oxide in the molten metal, becomes dross, and floats in layers on the molten metal surface.
[0004]
Dross consists of oxides and chlorides such as ZnO and ZnCl _2, and the generated amount varies greatly depending on the production amount, etc., but it is extremely large at several tons per day. The inside of the dross contains Zn metal and has a heavy specific gravity of about 2. The dross thickness reaches a maximum of 30 cm from the surface of the molten Zn.
[0005]
The dross is manually squeezed by workers and discharged outside the melting furnace.
[0006]
[Problems to be solved by the invention]
However, this work of scraping and discharging the dross is a work of thrusting the rake into the melting furnace reaching 500 to 600 ° C., scraping the dross and discharging it to the outside of the furnace. There was a problem of having to do harsh manual labor.
[0007]
In addition, since dross contains zinc metal and is heavy, there is a problem that the work of scraping such heavy dross with a long rake and discharging it from the melting furnace is a heavy labor.
[0008]
In addition, dross is in the form of powder, and when it is collected and discharged outside the furnace, a large amount of dust is generated, which has a problem that the health of workers is likely to be hindered.
[0009]
Aim that this invention to provide a melting furnace so as to be recovered automatically drained without the dross generated in the melting furnace to dissolve the zinc cathode thereby harsh manual labor, such as described above to the operator And
[0010]
[Means for Solving the Problems]
The present invention comprises a melting furnace, and the cathode charging device for charging the zinc cathode melting furnace, and the dross scraping device, and a dross stirrer provided substantially in parallel in the vicinity of the dross scraping device, the charging The apparatus includes a gripping means for gripping the zinc cathode and charging the zinc cathode into the charging furnace inlet, and an elevating means for moving the gripping means up and down. The dross scraping device projects a part out of the melting furnace. First shaft body, a spiral scraped blade provided on the peripheral surface of the first shaft body, a cladding tube covering a portion of the first shaft body outside the melting furnace and a portion of the scraping blade outside the melting furnace And a first driving means for rotating the first shaft body together with the scraping blade , the scraping blade is close to the molten metal surface of the melting furnace, and the first shaft body has a portion protruding out of the melting furnace to be high. Inclined part of the first shaft body in the melting furnace Above is the raking blade molten metal surface of the melting furnace, at least part is in the height position buried in dross layer, the zinc cathode is gripped by the gripping means, the gripping means of zinc cathode in a state of gripping the zinc cathode The tip is lowered until it is immersed in the molten metal surface of the melting furnace, and when the zinc cathode reaches the molten metal surface, the descending speed is reduced. A control device is provided that releases and then raises the gripping means .
[0011]
Here, the dross stirring device, a second shaft body provided substantially parallel to the molten metal surface of the melting furnace, a plurality of paddles provided radially on the peripheral surface of the second shaft body, Second driving means for rotating the second shaft body together with the paddle, and the paddle is provided at a height above the molten metal surface of the melting furnace and at least partially embedded in the dross layer. May be.
[0012]
The apparatus further comprises an erecting device that erects the zinc cathode in a substantially horizontal state in a substantially vertical state, and the erecting device erects the zinc cathode by rotating the clamping device to clamp both side ends of the zinc cathode. Rotating means may be provided, and the control device may cause the zinc cathode to stand upright on the standing device and cause the gripping means to grip the zinc cathode raised by the standing device.
[0013]
In addition, the zinc cathode is erected on the standing device, the zinc cathode erected by the erection device is gripped by the gripping means, and the gripping means in a state of gripping the zinc cathode is used as a tip portion of the zinc cathode. Is lowered until it is immersed in the molten metal surface of the melting furnace, the gripping means is released while the tip of the zinc cathode is immersed in the molten metal surface of the melting furnace, and then the gripping means is raised. An apparatus may be provided.
[0015]
Further, a transfer device that transfers the zinc cathode substantially horizontally toward the upright device in a substantially horizontal state may be provided, and the control device may include a control unit that causes the transfer device to convey the zinc cathode.
[0016]
Moreover, you may provide the control part which detects the hot_water | molten_metal surface height of a molten metal, controls the quantity which inserts the said zinc cathode, and adjusts the hot_water | molten_metal surface height of a molten metal in a fixed range.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view of a melting furnace according to the present invention, FIG. 2 is an explanatory view of a dross stirring device, and FIG. 3 is an explanatory view of a dross scraping device.
[0018]
As shown in these drawings, a melting furnace according to one embodiment of the present invention includes a transfer device 10 for transferring a zinc cathode, a standing device 20 for raising a zinc cathode 2 transferred by the transfer device 10, and A charging device 30 for charging the zinc cathode 2 erected by the standing device 20 into the melting furnace 4, a stirring device 40 for stirring and destroying and moving the dross in the melting furnace 4, and a dross in the melting furnace 4 And a scraping device 50 for scraping and discharging.
[0019]
The transfer device 10 has a conveyor (not shown) for carrying the zinc cathode 2 and moving it horizontally near the upright device 20 and a lifting means (not shown) for lifting the transferred zinc cathode so that it floats slightly. And a pusher 14 for pushing the zinc cathode 2 lifted by the lifting means out of the conveyor (not shown) toward the standing device 20.
[0020]
The upright device 20 includes a holding device 22 that holds the zinc cathode 2 in contact with both side ends of the zinc cathode 2 pushed out by the pusher 14, and a rotating unit that rotates the holding device 22 90 degrees to raise the zinc cathode 2. And.
[0021]
The charging device 30 includes a gripping means 32 for gripping the upper part of the zinc cathode 2 raised by the standing device 20 and a lifting / lowering means 34 for lifting the gripping means 32.
[0022]
The dross stirring device 40 includes a second shaft body 42 provided substantially parallel to the molten metal surface of the melting furnace 4, a plurality of paddles 44 provided radially on the peripheral surface of the second shaft body 42, And a second driving means 46 for rotating the biaxial body 42 together with the paddle 44. The paddle 44 is provided at a height above the molten metal surface of the melting furnace 4 so as to be at least partially buried in the dross layer. A plurality of dross stirring devices may be installed according to the size of the melting furnace or the amount of dross generated. In that case, it is installed in parallel with the dross scraping device.
[0023]
The dross scraping device 50 has a slight angle with respect to the molten metal surface of the melting furnace 4, a first shaft body 52 provided in the melting furnace 4 in a state of protruding out of the melting furnace 4, and a circumference of the first shaft body 52. A spiral scraping blade 54 provided on the surface, a cladding tube 56 covering a portion of the first shaft body 52 outside the melting furnace 4 and a portion of the scraping blade 54 outside the melting furnace 4, and a first shaft body 52 First drive means 58 that rotates together with the scraping blades 54 is provided.
[0024]
The first shaft body 52 is provided in an inclined state so that the outer portion of the melting furnace 4 is raised, and the scraping blade 54 is at a height position above the molten metal surface of the melting furnace 4, and at least a part thereof is a dross layer. It is provided in a buried state. A discharge port 60 for discharging dross is provided on the lower side near the outer end of the cladding tube 56.
[0025]
Next, the operation of each mechanism of the dross recovery facility will be described.
[0026]
When the zinc cathode 2 (600 to 800 kg / bundle) is placed on a conveyor (not shown), a detector (not shown) detects the placement of the zinc cathode 2, and the conveyor (not shown) starts to move. The zinc cathode 2 on the conveyor (not shown) is transferred toward the upright device 20. When the zinc cathode 2 reaches the position immediately before the standing device 20, another detector (not shown) detects the zinc cathode 2, and the conveyor (not shown) stops. Then, the zinc cathode 2 is slightly lifted from a conveyor (not shown) and pushed out by the pusher 14 between the holding devices 22 of the standing device 20.
[0027]
The sandwiching device 22 of the standing device 20 sandwiches both sides of the horizontal zinc cathode 2 and rotates 90 degrees in this state to vertically stand the zinc cathode 2. Next, the gripping device 32 of the charging device 30 grips the upper end portion of the zinc cathode 2, and the clamping device 22 of the standing device 20 moves away from both sides of the zinc cathode 2.
[0028]
The gripping device 32 of the charging device 30 descends while gripping the zinc cathode 2, and carries the zinc cathode 2 through the charging port (not shown) of the melting furnace 4 to just above the molten metal surface. The gripping device 32 reduces the descending speed when the zinc cathode 2 approaches the molten metal surface, and slowly immerses the tip of the zinc cathode 2 in the molten metal surface. And the holding | grip apparatus 32 separates the zinc cathode 2 in this state, and raises. The zinc cathode 2 away from the gripping device 32 gently enters the molten metal.
[0029]
When the zinc cathode 2 is inserted and the molten metal scatters in the melting furnace 4, the scattered molten metal adheres to the peripheral wall of the melting furnace 4, such as the furnace wall and the dross stirring device 40, and dross adheres to the lump. This lump is a great resistance to dross recovery and can easily lead to disasters such as burns to workers. In the apparatus according to the present invention, when the zinc cathode 2 is charged into the molten metal and dissolved, The cathode 2 is slowly charged into the molten metal to prevent the molten metal from scattering. Conventionally, the zinc cathode has been fed into the melting furnace from the inlet through gravity. When the cathode reached the molten metal surface of the melting furnace, the speed increased and the molten metal was easily scattered.
[0030]
The second shaft body 42 of the dross stirring device 40 is rotated by the second driving means 46, and the dross is loosened and pulverized by a plurality of paddles 44 provided around the second shaft body 42, and the dross scraping device 50 Discharging out of the melting furnace 4 becomes easy. In addition, zinc metal confined in the dross flows down due to the powdering of the dross and moves to the molten metal side.
[0031]
The first shaft body 52 of the dross scraping device 50 is rotated by the first driving device 58, and the dross is guided by the scraping blades 54 provided around the first shaft body 52 to move in the axial direction, and the inside of the covering cylinder 56. Through the outlet 60. The quality of Zn in the recovered dross is as high as about 75%, and it is reused in other processes of the smelter to recover Zn. The dross scraping device 50 and the dross stirring device 40 rotate in the same direction.
[0032]
The height of the molten metal is detected by a detector (not shown). When the molten metal reaches a certain level or more, the charging of the zinc cathode 2 is stopped, and the molten metal level is maintained at a certain level. 50. The dross stirring device 40 is prevented from being immersed in the molten Zn.
[0033]
【The invention's effect】
According to the present invention, the dross in the melting furnace can be automatically pulverized, scraped and discharged, so that there is an effect that the worker does not have to perform harsh physical labor under high heat.
[0034]
According to the present invention, the dross in the melting furnace can be automatically pulverized, scraped, and discharged, so that there is an effect that an operator does not have to work in a poor atmosphere where dust flows. .
[0035]
According to the present invention, since the zinc cathode is gently charged into the molten metal, the molten metal is prevented from being scattered when the zinc cathode is charged, and the zinc metal is prevented from being cast on the furnace wall. The agglomeration due to the adhesion of the dross to the metal peripheral surface is avoided, the difficulty of collecting the dross is avoided, and the dross is easily collected.
[0036]
According to the present invention, the dross is sufficiently pulverized in the furnace by the stirring device, and most of the zinc metal in the dross returns to the molten metal, so that there is an effect that the dissolution efficiency of the zinc cathode is increased.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a dross recovery facility according to the present invention.
FIG. 2 is an explanatory diagram of a dross stirring device.
FIG. 3 is an explanatory diagram of a dross scraping device.
[Explanation of symbols]
2 Zinc cathode 4 Melting furnace 10 Transfer device 14 Pusher 20 Standing device 22 Holding device 30 Loading device 32 Holding means 34 Lifting means 40 Dross stirring device 42 Second shaft body 44 Paddle 46 Second drive means 50 Dross scraping device 52 First Shaft body 54 Scraping blade 56 Clad tube 58 First drive means 60 Discharge port

Claims (3)

A melting furnace; a cathode charging device for charging a zinc cathode into the melting furnace; a dross scraping device; and a dross stirring device provided substantially parallel to the vicinity of the dross scraping device. Comprises a gripping means for gripping the zinc cathode and charging the zinc cathode into an inlet of the melting furnace, and an elevating means for raising and lowering the gripping means, and the dross scraping device partially includes a melting furnace. A first shaft body projecting outside, a spiral scraped blade provided on the peripheral surface of the first shaft body, a portion of the first shaft body outside the melting furnace, and the scraping blade outside the melting furnace And a first driving means for rotating the first shaft body together with the scraping blade. The scraping blade is close to the molten metal surface of the melting furnace , and the first shaft body is outside the melting furnace. The first axis is inclined so that the protruding part is higher Part of the melting furnace is the scraping blade above the melt surface of the melting furnace, there are at least partially in the height position buried in dross layer, the zinc cathode is gripped by the gripping means, the zinc cathode The gripping means in the gripped state is lowered until the tip of the zinc cathode is immersed in the molten metal surface of the melting furnace, and when the zinc cathode reaches the surface of the molten metal, the descending speed is lowered, and the tip of the zinc cathode is melted. A melting furnace comprising a control device for releasing the gripping state of the gripping means while being immersed in a molten metal surface of the furnace, and then raising the gripping means . The dross stirring device includes a second shaft body provided substantially parallel to the molten metal surface of the melting furnace, a plurality of paddles provided radially on the peripheral surface of the second shaft body, and the second Second driving means for rotating the shaft body together with the paddle, and the second shaft body is at a height position where the paddle is above the molten metal surface of the melting furnace and at least partially buried in the dross layer. The melting furnace according to claim 1, characterized in that: An upright device for raising the zinc cathode in a substantially horizontal state in a substantially vertical state; the upright device, a holding device for holding both end portions of the zinc cathode; and the zinc cathode is raised by rotating the holding device The rotation device is provided, and the control device raises the zinc cathode in the standing device, and causes the gripping device to grip the zinc cathode raised by the standing device. The melting furnace described in 1 .

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