WO2009006775A1 - A stirring molten bath, an online stirring apparatus and the method of laying out the apparatus - Google Patents

Abstract

A stirring molten bath, an online stirring apparatus and the method of laying out the apparatus are illustrated. The online stirring apparatus includes a smelting furnace (1) connected with an online chute (2), wherein the chute is connected with the internal cavity of the furnace. The stirring molten bath having a heat insulating bath body is installed on the online chute (2). The bath body has a molten metal inlet (45) and a molten metal outlet (46) on its side wall and is connected with the online chute (2) through the molten metal inlet (45) and the molten metal outlet (46). A non-magnetic bottom plate (47) is mounted on the bottom shellof the bath body. A magnetic stirrer (5) is laid out under the plate (47) of the stirring molten bath.

Description

 Stirring molten pool, on-line stirring device and setting method thereof

Technical field

 The invention relates to a stirring molten pool, an on-line stirring device and a setting method thereof, which are suitable for stirring a molten metal in a non-contact manner in non-ferrous metal smelting. Background technique

 In the process of non-ferrous metal smelting, it is necessary to stir the molten metal. At present, the non-contact permanent magnet stirring device is often used. The existing stirring device generally installs the agitator in the melting furnace, the holding furnace, the alloy furnace, the tilting furnace, etc. Working under the bottom of the furnace or installed outside the furnace body of each of the above furnaces for non-contact agitation, such as the super permanent magnet cyclone stirrer disclosed in CN1821695A and the circulating permanent magnet stirring disclosed in CN1920073A Device.

 Since the super-strong permanent magnet cyclone stirrer is installed under the furnace body near the position of the furnace body, there must be space for installing the agitator below the furnace body, and for the already established furnace, due to the furnace There is no space for installing the agitator below, that is, it is very difficult to modify the structure of the old furnace to modify it.

 The circulating permanent magnet agitator is installed between the outside of the furnace and the launder which communicates with the inner cavity of the furnace, so it is suitable for the technical transformation of the furnace which has been built but not used for a long time, for those who use The old furnace with a long time is not suitable, because it is necessary to add a flow hole on the furnace body during the transformation, which will cause damage to other parts of the old furnace during the process of adding the flow hole. In addition, the stirring mode flow tank is easy to slag, and the slag needs to be cleaned regularly, so that less is used. Summary of the invention

 SUMMARY OF THE INVENTION It is an object of the present invention to provide an agitation bath and its in-line agitation apparatus which are used without damaging the old furnace structure.

 Another object of the present invention is to provide a method of setting an in-line stirring device.

In order to achieve the above object, the present invention provides a stirring molten pool, which includes heat preservation The bottom of the pool body is provided with a bottom plate fixed to the pool body and made of a non-magnetic material, and the side of the pool body is provided with a melt inlet communicating with the inner cavity of the pool body. And melt outlet.

 The invention also provides an in-line stirring device, comprising: a melting furnace, wherein the melting furnace is connected with an in-line flow channel communicating with the inner cavity of the furnace, and a stirring molten pool is arranged on the online flow channel, the stirring The molten pool has an insulated pool body, and the side of the pool body is provided with a melt inlet and a melt outlet, and the pool body communicates with the online flow tank through the melt inlet and the melt outlet, The outer bottom surface of the pool body is provided with a bottom plate fixed to the pool body and made of a non-magnetic material, and a permanent magnet agitator is disposed below the bottom plate of the stirring molten pool.

 The invention further provides a method for setting an in-line stirring device, the setting method comprising the following steps A: disposing a stirring molten pool between the melting furnace and the deaerator, the side of the stirring molten pool having a molten metal inlet and a molten metal Export;

 Step B: setting a front flow channel of the online flow channel, the front flow channel is in communication with the furnace, and is connected to the stirring molten pool through the melt inlet;

 Step C: setting a back flow trough of the online flow trough, the rear flow trough is in communication with the deaerator, and is connected to the agitation molten pool through the melt outlet;

 Step D: Install a permanent magnet agitator below the stirred bath.

The principle of secondary agitation of the melt in the agitating bath is as follows: The permanent magnet stirrer uses a permanent magnetic system composed of a high-performance neodymium-iron-boron permanent magnet and a yoke and a secondary yoke made of a magnetically permeable material, the permanent The magnetic system is placed in the non-magnetic permanent magnet cover, and the magnetic field strength is strong. Under the driving of the frequency modulation motor controlled by the programmable controller according to the operating program, the forward and reverse directions are alternately rotated to generate a rotating magnetic field. The magnetic lines pass through the bottom plate and the bottom of the pool to enter the inner cavity of the pool, so that the molten liquid in the inner cavity of the pool is rotated and tumbling to achieve secondary agitation of the molten metal. The purpose of using the non-magnetic material to make the bottom plate is to prevent the bottom plate from short-circuiting the N-pole and S-pole in the permanent magnetic system during the operation of the permanent magnet stirrer, so as to ensure the normal operation of the permanent magnet stirrer. When the permanent magnetic system is operated at high speed, the eddy current generated by the rotating magnetic field on the bottom plate will cause the temperature of the bottom plate to be higher than 100 ° C, which affects the use of the permanent magnetic system. Lifetime, the bottom plate is spaced apart by a bottom plate cooling hole, which is to reduce the eddy current generated by the rotating magnetic field on the bottom plate and reduce the temperature of the bottom plate.

 As apparent from the above description, the present invention has the following beneficial effects:

 1. It does not damage the structure of the original furnace and degassing device, and has less investment. It is suitable for the technical transformation of the old furnace stirring device;

 2, less power consumption, the power of the permanent magnet stirrer is usually below 5KW, the power saving effect is significant;

3. When the temperature of the bottom plate is lower than 100 °C when working online, the permanent magnetic system of the permanent magnet stirrer can be operated below 50 °C by using simple air cooling system and heat insulation measures on the permanent magnet stirrer. In the environment, the service life is long and the failure rate is low;

 4. An energy-saving and environmentally-friendly online permanent magnet stirrer is installed under the bottom of the molten pool. The molten metal in the molten pool is stirred by the alternating positive and negative stirring mode and the programmable frequency control of the frequency modulation, which is energy-saving, pollution-free and continuous. jobs. DRAWINGS

 Figure 1 is a schematic structural view of an in-line stirring device of the present invention;

 2 is a schematic structural view of a stirring molten pool of the present invention;

 Figure 3 is a schematic view showing the structure of the bottom of the agitating molten pool of the present invention;

 Figure 4 is a cross-sectional view taken along line A - A of Figure 3;

 Figure 5 is a schematic structural view of a permanent magnet agitator;

 Figure 6 is a plan view of Figure 5. detailed description

As shown in FIG. 1 , the in-line stirring device according to the present invention comprises a furnace 1 , the furnace 1 is connected with an in-line flow cell 2 communicating with the inner cavity of the furnace 1 , and the other end of the online flow channel 2 is provided with a degassing device 3 . (or other means), a stirring bath 4 is provided on the in-line chute 2 between the furnace 1 and the deaerator 3 (or other means). As shown in FIG. 2-4, the agitating bath 4 has a heat-insulating, cylindrical shape or other suitable shape, the pool body has a casing 41, and the inner and lower portions of the casing 41 are fixedly connected with an insulation layer. 42. The upper port of the pool body is sealed with a pool cover 43 made of a heat insulating material and can be removed to improve the heat preservation effect of the stirring molten pool. A discharge port 44 with an on-off valve is disposed at a side of the pool body and at a bottom portion of the chamber body cavity. When the furnace maintenance is required, the melt remaining in the body cavity of the pool can be discharged in time to prevent solidification. The pool is in the body cavity. A melt inlet 45 and a melt outlet 46 communicating with the inner cavity of the cell body are respectively disposed on the side of the cell body, and the melt inlet 1, the in-line flow cell 2, and the molten metal inlet 46 can be made through the melt inlet 45 and the melt outlet 46. The agitating bath 4 is connected to each other; specifically, the pre-flow cell 21 of the in-line cell 2 is in communication with the furnace 1 and communicates with the agitating bath 4 through the melt inlet 45; the back channel 22 of the in-line cell 2 passes The melt outlet 46 communicates with the agitating bath 4 and communicates with the degassing device 3 or other devices. A bottom plate 47 fixed to the bottom surface of the cell body and made of a non-magnetic material is provided on the outer bottom surface of the cell body. In the embodiment, the bottom plate 47 is disposed at the center of the bottom of the heat insulating layer 42 and supports the heat insulating layer. 42. A plurality of bottom plate cooling holes 471 are spaced apart from each other on the bottom plate 47. In the embodiment, three bottom plate cooling holes are provided, and each of the bottom plate cooling holes 471 is strip-shaped, and the two ends thereof are curved, preferably each The upper port of the bottom plate cooling hole 471 is sealed with a hole cover 472 which is connected to the bottom plate 47 and made of a non-magnetic material. In the embodiment, the thickness of the hole cover 472 is thinner than that of the bottom plate 47, and the periphery of the hole cover 472 is The bottom plate cooling hole 471 is flat on the upper surface.

As shown in Figures 5 and 6, a permanent magnet agitator 5 is disposed below the bottom plate 47 of the agitating bath. The permanent magnet agitator 5 includes a frame 51. The center shaft 52 extends through the frame 51. The upper end of the center shaft 52 is fixed to the permanent yoke 53 and the yoke 54 by a plurality of permanent magnets 55. These permanent magnets 55 are attached. Uniformly spaced in a ray-like manner, and the opposite ends of the adjacent two permanent magnets 55 have opposite polarities, and each of the permanent magnets 55 is a neodymium-iron-boron permanent magnet, and the neodymium-iron-boron permanent magnets are fixed to the frame 51. The non-magnetic permanent magnet housing 56 is in the inner cavity. The non-magnetic permanent magnet cover 56 is provided with a temperature sensor 57 on its side, a non-metallic composite heat insulation layer 58 on the top surface, and a cooling fan 59 on the non-magnetic permanent magnet cover 56. The lower end of the center shaft 52 is fixed with a large pulley 60, and the large pulley 60 The transmission belt 61 is connected to the small pulley 62, and the small pulley 62 is fixedly connected to the rotating shaft of the frequency modulation motor 63. The frequency modulation motor 63 is controlled by the programmable controller in the control cabinet to realize the alternate forward rotation and the reverse Turning, and through the small pulley 62, the transmission belt 61, the large pulley 60, the central shaft 52, the plurality of permanent magnets 55 are synchronously rotated forward and reversely to generate a rotating magnetic field, and the magnetic field lines of the rotating magnetic field pass through the bottom plate 47 and the thermal insulation layer. 42 enter the cavity of the pool, and the melt in the cavity of the pool is rotated and tumbling to stir the melt.

 Therefore, the agitating molten pool 4 and the energy-saving and environmentally-friendly permanent magnet agitator 5 installed under the bottom of the molten pool 4 are installed in the in-line flow tank 2, so that it is not required to damage the original furnace structure, and the investment is small, and the structure is simple. In use, after the first agitation in the furnace 1, the molten metal flows into the agitating bath 4 from the in-line chute 2 and the melt inlet, and is stirred once, and the melt after the second agitation passes through the in-line chute and the melt. The outlet flows into the degassing device for degassing.

 In the central portion of the non-magnetic material (sensing zone) of the bottom plate 47 of the stirring molten pool 4, a plurality of bottom plate cooling holes 471 are added, and in the case of a high speed of the inductor, the molten pool bottom plate caused by the rotating magnetic eddy current of the inductor is greatly reduced. 471 temperature rise phenomenon, so that the bottom surface temperature of the molten pool is not more than 100 °C, the simple air cooling system and insulation measures can be used to achieve the stirrer temperature below 50 °C. The permanent magnetic sensor adopts the method of alternating positive and negative rotation and the programmable frequency modulation and speed control method to uniformly stir the molten metal in the stirring molten pool 4.

 The invention also relates to a method for setting an in-line stirring device, comprising the following steps: Step A: a stirring molten pool 4 is arranged between the melting furnace 1 and the deaerator device 3, and the side of the stirring molten pool 4 has a molten metal inlet 45 And the melt outlet 46;

 Step B: setting a front flow channel 21 of the in-line flow cell 2, the front flow channel 21 is in communication with the furnace 1, and is connected to the stirring molten pool 4 through the melt inlet 45;

 Step C: setting a rear flow channel 22 of the in-line flow cell 2, the rear flow channel 22 is in communication with the deaerator 3, and is connected to the agitation bath 4 through the melt outlet 46;

 Step D: Install a permanent magnet agitator 5 below the agitating bath 4.

Wherein, the step A further comprises the steps of: providing a pre-processed and non-magnetic The outer casing 41 of the bottom plate 47 made of a material is further filled with an insulating layer 42 fixed to the inner wall and the lower portion of the outer casing 41.

 The bottom plate 47 is spaced apart from the bottom plate 47, and the upper port of each of the bottom plate cooling holes 471 is sealed with a hole cover 472 which is connected to the bottom plate 47 and made of a non-magnetic material. In this embodiment, The thickness of the hole cover 472 is smaller than the thickness of the bottom plate 47.

Claims

Claim  A stirring molten pool comprising a heat-insulating cell body, wherein a bottom plate (47) fixed to the cell body and made of a non-magnetic material is provided on an outer bottom surface of the cell body. The side of the cell body is provided with a melt inlet (45) and a melt outlet (46) communicating with the inner cavity of the cell body.  2. The agitating molten pool according to claim 1, wherein the bottom plate (47) is spaced apart from the bottom plate cooling hole (471), and the upper port of each bottom plate cooling hole (471) is sealed and covered. A hole cover (472) that is connected to the base plate (47) and made of a non-magnetic material.  3. The agitating bath of claim 2, wherein the thickness of the aperture cover is less than the thickness of the base.  The agitating molten pool according to any one of claims 1 to 3, wherein the cell body comprises a casing (41), and an inner layer and a lower portion of the casing (41) are fixed with an insulating layer (42). The bottom plate (47) is located at a central portion of the bottom surface of the cell body.  The agitating bath of claim 2 or 3, wherein the bottom plate cooling hole (471) is in the form of a strip having an arc shape at both ends.  The agitating bath according to any one of claims 1 to 3, characterized in that the upper port of the cell body is sealed with a cell cover (43) which is made of a heat insulating material and can be removed.  The agitating bath according to any one of claims 1 to 3, characterized in that a discharge port (44) with an on-off valve is provided at a side of the cell body and at a bottom portion of the cell body cavity.  An in-line stirring device, comprising: a melting furnace, wherein the melting furnace is connected with an in-line flow channel communicating with the inner cavity of the furnace, wherein a stirring molten pool is arranged on the online flow channel, The stirring molten pool has a heat insulating pool body, and the side of the pool body is provided with a melt inlet (45) and a melt outlet (46), and the pool body passes through the melt inlet and the melt outlet and the online flow The groove is connected to each other, and a bottom plate (47) fixed to the cell body and made of a non-magnetic material is disposed on the outer bottom surface of the cell body, and a permanent magnet agitator (5) is disposed on the bottom plate of the agitating molten pool (47) ) below. The in-line stirring device according to claim 8, wherein the bottom plate (47) is spaced apart from the bottom plate cooling hole (471), and the upper port of each bottom plate cooling hole (471) is sealed. A cover plate (472) is attached to the bottom plate (47) and made of a non-magnetic material.  10. The in-line agitation apparatus of claim 9, wherein the aperture cover has a thickness that is less than a thickness of the bottom plate.  The in-line stirring device according to any one of claims 8 to 10, wherein the cell body comprises a casing (41), and an inner layer and a lower portion of the casing (41) are fixed with an insulating layer (42). The bottom plate (47) is located at a central portion of the bottom surface of the cell body.  The in-line stirring apparatus according to claim 9 or 10, wherein the bottom plate cooling hole (471) has a strip shape in which both ends are curved.  13. An in-line agitation apparatus according to any one of claims 8 to 10, wherein the upper port of the cell body is sealed to cover a cell cover (43) which is made of an insulating material and which can be removed.  The in-line agitation apparatus according to any one of claims 8 to 10, characterized in that a discharge port (44) with an on-off valve is provided at a side of the cell body and at a bottom portion of the cell body cavity.  The in-line stirring apparatus according to any one of claims 8 to 10, wherein the in-line flow tank is provided with a deaerator at the other end of the furnace.  The in-line agitation apparatus according to any one of claims 8 to 10, characterized in that the furnace (10) comprises a melting furnace, a holding furnace, an alloy furnace or a two-chamber furnace.  17. A method of setting an in-line stirring device, the setting method comprising the following steps: Step A: providing a stirring molten pool (4) between the melting furnace (1) and the deaerator (3), the stirring molten pool (4) The side has a melt inlet (45) and a melt outlet (46);  Step B: setting a front flow channel (21) of the inline flow cell (2), the front flow channel (21) communicating with the furnace (1), and passing through the melt inlet (45) and the stirring molten pool (4) Connected  Step C: setting a back flow channel (22) of the online flow cell (2), the rear flow channel (22) is in communication with the deaerator (3), and passes through the melt outlet (46) and the agitation bath (4) Connected; Step D: Install a permanent magnet stirrer (5) under the agitating bath (4). The setting method according to claim 17, wherein the step A further comprises the steps of: providing a pre-processed outer casing (41) with a bottom plate (47) made of a non-magnetic material; Further, the outer casing (41) is filled with an insulating layer (42) fixed to the inner wall and the lower portion of the outer casing (41). The method according to claim 18, wherein the bottom plate (47) is spaced apart from the bottom plate cooling hole (471), and the upper port of each bottom plate cooling hole (471) is sealed and covered. The bottom plate (47) is connected and made of a non-magnetic material hole cover (472).  20. The method according to claim 19, wherein the hole cover (472) has a thickness smaller than a thickness of the bottom plate (47).