CN102912273A - Centrifugal dross removing device with high-frequency amplitude-modulated electromagnetic field used in continuous hot-dip galvanizing process for aluminum - Google Patents

Abstract

The purpose of the present invention is to provide a device for centrifugally removing slag in a high-frequency amplitude-modulated magnetic field for continuous hot-dip galvanized aluminum, so that the zinc liquid containing zinc slag can effectively Remove the zinc dross in the zinc liquid, avoid the deposition and accumulation of zinc dross in the zinc pot, so as to reduce the zinc dross defects on the surface of Galvalume steel, thereby improving production efficiency and steel surface quality. The zinc liquid is kept warm until the temperature of the zinc pool is the same, and then transported back to the zinc pot to achieve the recycling of the zinc liquid.

Description

A device for centrifugal slag removal by medium and high frequency amplitude modulation magnetic field for continuous hot-dip galvanized aluminum

technical field

The invention relates to the technical field of hot-dip galvanizing, in particular to a device for centrifugally removing slag in a medium-frequency amplitude-modulated magnetic field for continuous hot-dip galvanizing of aluminum.

Background technique

Hot-dip galvanizing is an economical and effective device to protect steel from corrosion. Its coating has good sacrificial performance, but its service life is short. Hot-dip aluminum coating is dense and has a long service life, but its cathodic protection ability is poor. The zinc-aluminum alloy coating takes into account the durable protection of aluminum and the cathodic protection of zinc. The performance of its coating is superior to that of a single-element coating, and its anti-corrosion performance is several times higher than that of pure zinc coating. Galvalume coating (aluminized zinc plate, containing 55% Al by weight, 43.4% Zn, 1.6% Si) has a unique microstructure, and its excellent corrosion resistance, formability and welding performance are widely used in the automotive industry, It is widely used in construction industry and household appliances and other industries.

However, the problem of excessive slag in the Galvalume molten pool seriously affects product quality; the problem of molten pool scum has been a common problem in continuous galvanizing production lines for a long time. The content of aluminum in Galvalume coated steel sheets is relatively high, and hot-dip Compared with pure zinc, the composition of the zinc pool changes greatly, and the addition of silicon also makes the phase relationship in the zinc pool more complicated. The main components in the Galvalume molten pool are iron-aluminum and iron-aluminum-silicon intermetallic compounds. In addition, Galvalume The density of the molten pool is about 1/2 of that of hot-dip pure zinc. Therefore, it is easier to form zinc slag in the Galvalume molten pool. At present, several Galvalume production lines in Bluescope Steel in Australia have serious zinc slag problems. Galvalume production lines of steel and other companies also have the problem of zinc dross, so avoiding zinc dross defects is very critical for the production of high-quality Galvalume steel plates.

Contents of the invention

The purpose of the present invention is to provide a device for centrifugally removing slag in a high-frequency amplitude-modulated magnetic field for continuous hot-dip galvanized aluminum, so that the zinc liquid containing zinc slag can effectively Remove the zinc dross in the zinc liquid, avoid the deposition and accumulation of zinc dross in the zinc pot, so as to reduce the zinc dross defects on the surface of Galvalume steel, thereby improving production efficiency and steel surface quality. The zinc liquid is kept warm until the temperature of the zinc pool is the same, and then transported back to the zinc pot to achieve the recycling of the zinc liquid.

A device for centrifuging zinc slag in a medium-frequency amplitude modulation magnetic field for continuous hot-dip galvanized aluminum, located outside the zinc pot, characterized in that the device includes: a zinc liquid conveying device, a primary zinc slag filtering device, and a secondary high-frequency amplitude modulation A magnetic field centrifugal separation zinc slag device; the zinc liquid delivery device includes a zinc liquid pump and a zinc liquid flow tank; the inlet of the zinc liquid flow tank is connected to the zinc pot through a zinc liquid delivery pipe, and the zinc liquid delivery pipe is provided with a zinc liquid pump, The outlet of the zinc liquid launder is connected with the zinc pot through the zinc liquid outlet pipe to form a circuit; the first-stage zinc slag filtering device is an alumina foam ceramic filter, which is located in the zinc liquid launder, close to the inlet of the zinc liquid launder; The secondary high frequency amplitude modulation magnetic field centrifugal separation zinc slag device includes: high frequency induction heating power supply, amplitude modulation generator, transformer, motor, high temperature resistant material shell, drum, porous ceramic tube, induction heating coil, heat insulation sleeve, heating rod and thermocouple thermometer; the porous ceramic tube is inlaid inside the drum, and the drum is placed inside the induction heating coil. The heat insulation sleeve is used to separate the drum and the induction heating coil. The porous ceramic tube, the drum, and the induction heating coil and the heat insulation sleeve are placed inside the shell of high temperature resistant material; the shell of high temperature resistant material is located in the zinc liquid flow tank, close to the outlet of the zinc liquid flow tank; the high frequency induction heating power supply, amplitude modulation generator, transformer and motor are all placed in the zinc liquid flow tank Outside the liquid flow tank, the heating rod is installed at the bottom of the zinc liquid flow tank, and the thermocouple thermometer is installed on the side of the zinc liquid flow tank close to the outlet of the zinc liquid flow tank. The high-frequency induction heating power supply passes through the wire and the amplitude modulation generator and transformer. The transformer is connected to the induction heating coil through wires, the motor is connected to the drum through wires, and the thermocouple thermometer is connected to the thermocouple located in the zinc liquid flow tank through wires.

The device for continuous hot-dip galvanized aluminum mid-high frequency amplitude modulation magnetic field centrifugal separation of zinc slag is characterized in that the zinc liquid outlet pipe extends 150-500 mm below the zinc liquid surface of the zinc pot.

The device for continuous hot-dip galvanized aluminum mid-high frequency amplitude modulation magnetic field centrifugal separation of zinc slag is characterized in that the maximum operating temperature of the alumina foam ceramic filter is 1350°C, and the specification is 10-50ppi.

The device for continuous hot-dip galvanized aluminum mid-high frequency amplitude modulation magnetic field centrifugal separation of zinc slag is characterized in that: the induction heating coil is wound by a copper tube with a diameter of 8mm, and its inner diameter is 120-300mm. The number of turns is 15-25 turns, and the interior is cooled by circulating water. Under the action of high-frequency induction heating power supply and transformer, it can generate a high-frequency induction magnetic field of 25-40KHz, and the magnetic induction intensity is 0.05-0.15T.

The device for centrifugally separating zinc slag in a medium-high frequency amplitude-modulated magnetic field for continuous hot-dip galvanized aluminum is characterized in that: the amplitude-modulated generator is an amplitude-modulated generator capable of generating sine waves, square waves or triangular waves, and the frequency is adjusted The range is 1-15KHz.

The device for continuous hot-dip galvanized aluminum medium and high-frequency amplitude modulation magnetic field centrifugal separation of zinc slag is characterized in that: the outer diameter of the porous ceramic tube is 80-200mm, and the hole is a square hole of 6×6mm.

The device for centrifuging zinc slag in a medium-high frequency amplitude modulation magnetic field for continuous hot-dip galvanized aluminum is characterized in that the outer diameter of the drum is 100-250 mm.

The device for centrifugally separating zinc slag in a medium-frequency amplitude-modulated magnetic field for continuous hot-dip galvanized aluminum is characterized in that the motor is an AC asynchronous motor with a rated frequency of 50 Hz and a rated voltage of 220 V.

The device for continuous hot-dip galvanized aluminum medium and high-frequency amplitude modulation magnetic field centrifugal separation of zinc slag is characterized in that: the heat insulation sleeve is made of aluminum silicate fiber material; the high temperature resistant material shell It is fused mullite material.

The device for centrifugally separating zinc slag in a medium-high frequency amplitude modulation magnetic field for continuous hot-dip galvanized aluminum is characterized in that: the zinc liquid outlet pipe is also provided with a solenoid valve, which is located above the zinc liquid pump.

A method for centrifuging zinc slag in a medium-high frequency amplitude modulation magnetic field for continuous hot-dip galvanized aluminum, characterized in that it comprises the following steps:

(1) Use the zinc liquid pump to pump the zinc liquid in the zinc pot into the zinc liquid flow tank through the zinc liquid delivery pipe;

(2) Pumped into the zinc liquid launder, it first passes through the alumina foam ceramic filter, and the particle size of the zinc slag is larger than

35μm zinc dross is removed;

(3) The zinc liquid passing through the alumina foam ceramic filter enters the drum, and the high-frequency induction heating is started

Thermal power supply, amplitude modulation generator and transformer, the induction heating coil located outside the drum generates a high-frequency induction magnetic field, and at the same time, the motor is started to drive the drum inlaid with porous ceramic tubes to rotate. At this time, the zinc liquid containing zinc slag is not only subjected to electromagnetic pressure The effect is also affected by the centrifugal force, and the zinc slag is finally attached to the porous ceramic tube under the action of the two forces and is removed.

(4) Under the action of the heating rod, the purified zinc liquid is kept warm to the same temperature as the zinc pot, and then re-

Transfer back to the zinc pot.

The method for centrifuging zinc slag in a medium-high frequency amplitude modulation magnetic field for continuous hot-dip galvanized aluminum is characterized in that

In that: the frequency of the high-frequency induction magnetic field is 25-40KHz, and the magnetic induction intensity is 0.05-0.15T.

A method for centrifuging zinc slag in a medium-high frequency amplitude modulation magnetic field for continuous hot-dip galvanized aluminum is characterized in that

In: the rotational speed of the drum is 800-1200 rpm.

The first-stage zinc slag filtering device is an alumina foam ceramic filter. The zinc liquid pump pumps the zinc pipe and immerses it in the zinc pool. After the zinc liquid passes through the alumina foam ceramic filter, the large particles of zinc slag are removed; then the zinc liquid flows into the secondary high-frequency amplitude modulation magnetic field centrifugal slag removal device.

The secondary high-frequency amplitude-modulated magnetic field centrifugal slag removal device is installed in the middle of the zinc liquid purification pool. The secondary electromagnetic slag removal device includes a high-temperature-resistant material shell, a high-frequency induction heating power supply, an amplitude modulation generator, an induction heating coil, and a heat insulation sleeve The cylinder, the high temperature resistant cylinder and the motor with porous ceramic tubes, the induction heating coil is under the action of the high-frequency induction heating power supply and the transformer, and the internal circulation water cooling can generate a high-frequency induction magnetic field of 25-40KHz, and the magnetic induction intensity is 0.05- 0.15T, the induction heating coil is wound with a copper tube with a diameter of 8mm, its inner diameter is 120-300mm, and the number of turns is 15-25 turns; the frequency adjustment range of the amplitude modulation generator is 1-15KHz, and the amplitude modulation occurs When the device is working, its low-frequency wave is modulated to the high-frequency carrier wave, and a high-frequency amplitude-modulated magnetic field will be generated inside the induction heating coil. In one cycle of applying the sine wave amplitude-modulated magnetic field, the change frequency of the magnetic field is twice the original, and the electromagnetic force The change frequency is also twice the original; when this electromagnetic force is applied in the zinc liquid containing zinc slag, due to the large difference in conductivity between the zinc slag and the zinc liquid, there is an electromagnetic force between the zinc liquid and the zinc slag. Pressure, and under the action of high-frequency amplitude modulation magnetic field, the electromagnetic pressure is more obvious.

At the same time, the motor is used to drive the rotating drum inlaid with porous ceramic tubes, and the porous ceramic tubes are embedded in the drum. At this time, the zinc liquid containing zinc slag is not only affected by electromagnetic pressure, but also by centrifugal force. Under the action of the action, it is finally attached to the porous ceramic tube and removed. The outer diameter of the porous ceramic tube is 80-200mm, the hole is a square hole of 6×6mm, the outer diameter of the drum is 100-250mm, and the motor is an AC asynchronous motor. The rated frequency is 50Hz, and the rated voltage is 220V. The heat insulation sleeve is made of aluminum silicate fiber material with excellent heat insulation performance, which is used to separate the induction heating coil and the drum, and is used to protect the induction heating coil; Heating coils, heat insulating sleeves and a rotating drum lined with porous ceramic tubes are all placed inside the shell of high temperature resistant material.

The high-frequency amplitude modulation magnetic field centrifugal slag removal device of the present invention is placed outside the zinc pot during operation, and under the action of the zinc liquid pump, the zinc liquid inside the zinc pot is continuously extracted into the slag removal device and flows through a A high-grade alumina foam ceramic filter and a two-stage high-frequency amplitude-modulated magnetic field centrifugal slag removal device. When the first-stage flows through the alumina foam ceramic filter, the zinc slag with a particle size greater than 35 μm is removed; after that, it flows through the secondary high-frequency During the amplitude-modulated magnetic field centrifugal slag removal device, due to the large difference in electrical conductivity between the zinc slag and the zinc liquid, under the joint action of electromagnetic pressure and centrifugal force, the zinc slag with a particle size of less than 35 μm moves to the wall of the porous ceramic tube and finally adheres to the surface of the tube. On the wall, under the action of the heating rod, the purified zinc liquid is kept warm until the temperature of the zinc liquid in the zinc pot is the same, and then transported back to the zinc pot, so that the effect of continuous purification of the zinc liquid can be achieved, and the Galvalume is greatly reduced. Possibility of product to develop dross defects.

The slag removal device of the present invention is placed outside the zinc pot for processing. Under the action of high-frequency induction heating power supply, the induction heating coil is cooled by circulating water inside to generate a high-frequency induction magnetic field with a frequency of 35KHz and a magnetic induction intensity of 0.12T. AM generator The adjusted frequency is 5KHz, using a porous ceramic tube with a diameter of 100mm, a length of 400mm, and an aperture size of 6×6mm. After 20 hours, the zinc slag in the zinc liquid in the zinc pot can be reduced by more than 80%.

Description of drawings

The accompanying drawings described here are used to further explain the present invention and constitute a part of the application. The structural schematic diagram of the present invention is used to explain the present invention and does not constitute an improper limitation of the present invention. The protection scope of the present invention is not limited to the following schematic diagrams;

In the attached picture:

Fig. 1 is the schematic diagram of hot-dip galvanizing process of steel plate carried out by hot-dip galvanizing pot on the general production line;

As shown in Figure 1, 1 is a zinc pot, 2 is a sinking roll, 3 is a steel plate, 4 is a furnace nose and 5 is an air knife;

Fig. 2 is a schematic structural view of the high-frequency amplitude-modulated magnetic field centrifugal slag removal device of the present invention.

Detailed ways

Below in conjunction with accompanying drawing the embodiment of the present invention is described in detail: present embodiment carries out example under the premise of technical solution of the present invention, has provided detailed implementation mode and process, but protection scope of the present invention is not limited to following implementation example.

As shown in Figure 2, the device of this example includes: a liquid zinc conveying device, a first-stage filter zinc slag device, and a secondary high-frequency amplitude-modulated magnetic field centrifugal slag removal device, wherein the liquid zinc conveying device includes a liquid zinc pump 13, a liquid zinc Delivery pipe 14, solenoid valve 15, zinc liquid flow tank 20, zinc liquid pump 13 are placed above the zinc pot; the first-stage filter zinc slag device is alumina foam ceramic filter 11, placed in the right part of zinc liquid flow tank 20, two A high-frequency amplitude-modulated magnetic field centrifugal slag removal device is installed in the middle of the zinc liquid flow tank 20, and the high-frequency amplitude-modulated magnetic field centrifugal slag removal device includes a high-frequency induction heating power supply 17, an amplitude modulation generator 18, a transformer 16, a motor 19, a high-temperature resistant Material shell 6, drum 7, porous ceramic tube 8, induction heating coil 9 and heat insulation sleeve 10; porous ceramic tube 8 is embedded inside the drum 7, and the drum 7 is placed inside the induction heating coil 9, and the heat insulation sleeve The drum 10 is used to separate the rotating drum 7 and the induction heating coil 9; the rotating drum 7, the porous ceramic tube 8, the induction heating coil 9 and the heat insulation sleeve 10 are all placed inside the high temperature resistant material shell 6; the high frequency induction heating power supply 17, The amplitude modulation generator 18, transformer 16 and motor 19 are all placed outside the zinc liquid flow tank 20, the heating rod 12 is installed at the bottom of the zinc liquid flow tank 20, and the thermocouple thermometer 21 is installed at the side of the zinc liquid flow tank 20.

The zinc liquid launder 20 is provided with a zinc liquid conveying pipe 14, and the zinc liquid conveying pipe 14 is connected to the zinc liquid launder 20 through a flange, and a zinc liquid outlet pipe is provided between the zinc liquid launder 20 and the zinc pot 1 .

The maximum service temperature of the alumina foam ceramic filter 11 is 1350°C, and the specification is 10-50ppi.

Under the action of the high-frequency induction heating power supply 17 and the transformer 16, the induction heating coil is cooled by circulating water inside, and can generate a high-frequency induction magnetic field of 25-40KHz, and the magnetic induction intensity is 0.05-0.15T, and then the amplitude modulation wave can be applied. Generate a high-frequency amplitude modulation magnetic field; the amplitude modulation generator 18 has a frequency adjustment range of 1-15KHz; the induction heating coil is wound with a copper tube with a diameter of 8mm, its inner diameter is 120-300mm, and the number of turns is 15-25 turns.

The motor 19 is an AC asynchronous motor with a rated frequency of 50Hz and a rated voltage of 220V.

The outer diameter of the porous ceramic tube is 80-200 mm, the hole is a square hole of 6×6 mm, and the outer diameter of the drum is 100-250 mm.

The heat insulating sleeve 10 is made of aluminum silicate fiber material.

The high temperature resistant material shell 6 is made of fused mullite material.

The zinc liquid launder 20, the primary alumina foam ceramic filter 11 and the secondary high-frequency amplitude-modulated magnetic field centrifugal slag removal device are all placed outside the zinc pot 1 during operation.

When the present embodiment works, the zinc liquid conveying pipe 14 is immersed in the zinc liquid surface 150-500mm, and the zinc liquid is continuously extracted under the action of the zinc liquid pump 13 and placed in the zinc liquid flow tank 20. First, the zinc liquid passes through a Grade alumina foam ceramic filter 11, the alumina foam ceramic filter 11 is installed in the right part of the zinc liquid flow tank 20, the zinc slag with a diameter greater than 35 μm in the zinc liquid is removed, and the zinc slag with a diameter of less than 35 μm is filtered by the first stage. The final zinc liquid flows into the secondary high-frequency amplitude modulation magnetic field centrifugal slag removal device, which is placed in the middle of the zinc liquid flow tank 20. When the zinc liquid passes through the porous ceramic tube under the combined action of electromagnetic pressure and centrifugal force At 8 o'clock, the porous ceramic tube 8 can capture the zinc slag in it. After passing through the two-stage high-frequency amplitude-modulated magnetic field centrifugal slag removal device, the zinc slag with a diameter of less than 35 μm will be removed, and the purified zinc liquid will be removed under the action of the heating rod 12. Make the zinc liquid temperature consistent with the zinc liquid temperature in the zinc pot, and then flow back to the zinc pot through the zinc liquid outlet pipe on the side of the zinc liquid flow tank 20, and the zinc liquid flow tank 20 and the zinc liquid outlet pipe are connected by flanges , to realize the circulation and purification of zinc liquid.

It can be seen from the above implementation examples that the device for centrifugally removing slag in the high-frequency amplitude-modulated magnetic field for continuous hot-dip galvanized aluminum of the present invention can effectively remove the slag in the zinc liquid, and can effectively avoid the generation of slag defects in the hot-dip galvanized aluminum steel sheet , to provide a guarantee for the quality of high hot-dip galvanized steel sheets, and at the same time reduce the consumption of zinc solution, bringing considerable social and economic benefits.

Claims (10)

1. the device of a continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia is positioned at the zinc pot outside, and it is characterized in that: described device comprises: zinc liquid e Foerderanlage, single filter cadmia device and secondary high frequency amplitude-modulated magnetic field centrifugation cadmia device; Described zinc liquid e Foerderanlage comprises zinc liquid pump and zinc spout; The import of zinc spout links to each other with the zinc pot by zinc liquid transfer lime, and zinc liquid transfer lime is provided with the zinc liquid pump, and the outlet of zinc spout links to each other with the zinc pot by zinc liquid delivery line, consists of the loop; Single filter cadmia device is the Alumina Foam Ceramics strainer, is positioned at the zinc spout, near the import of zinc spout; Described secondary high frequency amplitude-modulated magnetic field centrifugation cadmia device comprises: high-frequency induction heating power, amplitude modulation producer, transformer, electric motor, high temperature material shell, rotating cylinder, porous ceramic pipe, load coil, insulating sleeve, heating rod and thermocouple temperature measurement instrument; Porous ceramic pipe is embedded in rotating cylinder inside, and rotating cylinder is positioned over again load coil inside, and insulating sleeve is used for separating rotating cylinder and load coil, and porous ceramic pipe, rotating cylinder, load coil and insulating sleeve all are positioned over the high temperature material enclosure; The high temperature material shell is positioned at the zinc spout, near the outlet of zinc spout; It is outside that high-frequency induction heating power, amplitude modulation producer, transformer, electric motor all are positioned over the zinc spout, the heating rod device is in zinc spout bottom, the thermocouple temperature measurement instrument apparatus is in a side of the close zinc spout outlet of zinc spout, high-frequency induction heating power is connected with transformer with the amplitude modulation producer by wire, transformer by wire be connected with load coil, electric motor is connected with rotating cylinder by wire, the thermocouple temperature measurement instrument is connected with the thermopair that is positioned at the zinc spout by wire.

2. the device of a kind of continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia as claimed in claim 1 is characterized in that: described zinc liquid delivery line stretches into 150 – 500mm under the zinc liquid liquid level of zinc pot.

3. the device of a kind of continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia as claimed in claim 1, it is characterized in that: the maximum operation (service) temperature of described Alumina Foam Ceramics strainer is 1350 ℃, specification is 10 – 50ppi.

4. the device of a kind of continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia as claimed in claim 1, it is characterized in that: it is the copper tube coiled of 8mm that described load coil adopts diameter, its internal diameter is 120 – 300mm, the number of turn is 15 –, 25 circles, inner logical circulating water, can produce the high-frequency induction magnetic field of 25 – 40KHz under high-frequency induction heating power and transformer action, magnetic induction density is 0.05 – 0.15T.

5. the device of a kind of continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia as claimed in claim 1, it is characterized in that: described amplitude modulation producer is for producing the amplitude modulation producer of sine wave, square wave or choppy sea waveform, and frequency-tuning range is 1-15KHz.

6. the device of a kind of continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia as claimed in claim 1, it is characterized in that: described porous ceramic pipe external diameter is 80 – 200mm, and its hole is the square opening of 6 * 6mm.

7. the device of a kind of continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia as claimed in claim 1, it is characterized in that: the external diameter of described rotating cylinder is 100 – 250mm.

8. the device of a kind of continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia as claimed in claim 1, it is characterized in that: described electric motor is AC asynchronous motor, and rated frequency is 50Hz, and voltage rating is 220V.

9. the device of a kind of continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia as claimed in claim 1, it is characterized in that: described insulating sleeve, its material are the aluminum silicate fiber material; Described high temperature material shell is the electrofused mullite material.

10. the device of a kind of continuous hot-dipping zinc-aluminium medium-high frequency amplitude modulated magnetic field centrifugation cadmia as claimed in claim 1 is characterized in that: also be provided with magnetic valve on the described zinc liquid delivery line, be positioned at zinc liquid pump top.

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