CN209798043U - Device for purifying aluminum alloy melt by bias powder spraying - Google Patents

Abstract

The utility model belongs to the non ferrous metal field of purifying relates to a device that aluminium alloy fuse-element biasing was dusted powder and is purified. It includes: the device comprises a spiral feeding quantitative gas-powder mixing mechanism consisting of a variable frequency motor (1), a hopper (2), a screw (3) and a gas-powder mixing chamber (6), an offset rotary blowing device (7) connected with the gas-powder mixing mechanism, and a crucible (10) separated into a purifying chamber (9) and a filtering chamber (11) by a partition plate (14), wherein a ceramic foam filtering plate (13) is arranged above the filtering chamber (11). The utility model discloses can be steady, continuous carry out purification treatment, show improvement aluminium melt purifying effect to the aluminium melt.

Description

Device for purifying aluminum alloy melt by bias powder spraying

Technical Field

The utility model belongs to the non ferrous metal metallurgy field especially relates to a device that aluminium alloy fuse-element biasing was dusted powder and is purified.

Background

Melt purification is a key technology for ensuring the metallurgical quality of aluminum alloy materials. The main purpose of the aluminum alloy melt purification is to remove the hydrogen content and oxide inclusions in the melt, thereby improving the quality of the aluminum alloy. The method for purifying the aluminum melt mainly comprises the following steps: solvent methods, air blowing methods, rotary blowing methods, and the like. The commonly used refining agent is added to purify the aluminum melt, and although the refining agent can play a certain refining role, the refining agent is easy to gather together, and the adding amount is large in order to achieve the effect. Therefore, gas + solvent refining processes have also emerged. Through search, the 'one kind of material spraying device' participates in the patent application number: 20092014473.8, mixing the gas and solvent, injecting them into the melt, and distributing the solvent on the surface of the bubble in the melt to realize double refining effect. However, in this method, the bubbles formed are not fine enough, and the amount of the solvent used is also large. The Shanghai university of transportation developed "aluminum alloy melt purification method" see patent application No.: 0510026593.X, the upper part of the purifying device blows purifying gas into the aluminum melt by a rotary blowing method, and the bottom of the device is provided with air bricks to blow the purifying gas into the melt. Shanghai electro-mechanical academy developed "a top-angle re-blowing type aluminum melt degassing method and apparatus" see patent application No.: 0910044935.9, the purge gas is blown from the rotating device into the aluminium melt, while the purge gas is also blown from the peripheral gas inlet holes of the purge device into the aluminium melt. These methods all belong to central rotating blowing, and in order to obtain finer and better bubble distribution conditions, high-speed rotation is often adopted for realization. However, with the increase of the rotating speed, the melt liquid level can generate vortex and vibration, the protective film on the melt liquid level is damaged, slag and air on the surface can enter the melt, and the impurities of the melt are increased; the air reacts with the melt, burning away the melt and creating more hydrogen and inclusions. In actual production, a baffle is usually provided near the rotor in order to prevent the generation of liquid surface vortex. However, during melt refining, the melt temperature is very high, the rotation speed of the rotor is very fast, the scouring and corrosion effects of the melt on the baffle are very strong, the working environment of the baffle is very severe, the service life is short, the cost is high, and the fallen materials invade into the melt to cause pollution and finally influence the quality of the melt. Suzhou Boneng kiln science and technology company developed a "turbulent flow structure for a degassing device" in patent application No.: 201210414279.9 the device comprises a baffle block with a convex shape on each of four sides in the degassing tank for eliminating liquid surface vortex. The method increases the complexity of the degassing pool, and simultaneously does not solve the problem that the turbulence block is easy to wash and fall off to enter the melt.

Disclosure of Invention

An object of the utility model is to overcome above-mentioned prior art not enough, provide one kind can be in succession steady on-line purification aluminium melt, showing effect interface, effect range, the extension action time that has increased the purification of refining agent, low refining agent quantity, be convenient for change, high life filter, simple structure, with low costs aluminium melt purifier.

The utility model discloses a realize through following mode:

A device for bias powder spraying and purification of aluminum alloy melt is characterized by comprising a spiral feeding quantitative gas-powder mixing mechanism consisting of a variable frequency motor, a hopper, a screw rod and a gas-powder mixing chamber, a bias rotary blowing device connected with the gas-powder mixing mechanism, a crucible separated into a purification chamber and a filter chamber by a partition plate, and a ceramic foam filter plate is arranged above the filter chamber. The melt inlet is arranged above the purifying chamber, the melt flows through the purifying chamber from top to bottom, the melt outlet is arranged above the filtering chamber, and the purified melt flows out from the melt outlet after passing through the filtering plate from bottom to top. Purified gas is blown into the gas-powder mixing chamber, a refining agent is placed into the hopper, a variable frequency motor drives a screw to quantitatively flow into the gas-powder mixing chamber and fully mix with the purified gas to form gas-powder flow, and then the gas-powder flow is introduced into the offset rotary blowing device to form fine and uniform purified bubbles which are dispersed and distributed on the surface of the refining agent.

The device for bias powder spraying and purification of the aluminum alloy melt is characterized in that the rotating speed of the screw is controlled by a variable frequency motor, and the refining agent can be quantitatively fed into the gas-powder mixing chamber.

The device for purifying the aluminum alloy melt by bias powder spraying is characterized in that the content of a refining agent in the gas powder flow is 0.1-0.5% of the melt inlet melt flow.

The device for purifying the aluminum alloy melt by offset powder spraying is characterized in that the distance from the rotary head of the offset rotary spraying device to the bottom of the purifying chamber is 50-300 mm, and the distance from the central axis of the rotary head to the center of the purifying chamber is 1/5-1/3 of the diameter of the bottom of the purifying chamber.

the device for purifying the aluminum alloy melt by bias powder spraying is characterized in that the specification of the ceramic foam filter plate is 40-50 ppi.

The utility model discloses during the use, put into the hopper with dry concise agent, inverter motor gives the reasonable rotational speed of screw rod, makes the flow of sending into of concise agent be 0.1 ~ 0.5% of fuse-element flow and purified gas after the intensive mixing of gas-powder mixing chamber, blows in rotatory blowing device, is sheared by high-speed rotatory blade, and concise agent can disperse and distribute on tiny even clean bubble surface. The purified bubbles of the refining agent with the dispersed and distributed surface slowly rise in the purifying chamber and are fully mixed and collided with the descending melt, hydrogen in the melt diffuses into the rising bubbles, and meanwhile, the rising bubbles collide with the non-metal inclusions in the melt, adsorb and carry the rising bubbles and the non-metal inclusions to float upwards. The refining agent distributed in a dispersing way increases the concentration gradient of hydrogen diffusing into bubbles and the wettability of the hydrogen to impurities, so that the hydrogen is absorbed and the impurities are adsorbed more easily, the melt is also stirred, the action interface and the action range of the refining agent and the purified bubbles are obviously increased, the contact time is prolonged, meanwhile, the stirring also promotes the aggregation of fine impurities, and the flotation removal is facilitated. The bias stirring mode, the tangential flow, the pressure field and the speed field of the melt around the rotor are asymmetrically distributed, and centripetal acceleration and centrifugal force are not easy to generate, so that the liquid level can not generate vortex during refining, and the liquid level can be stable without increasing a baffle. After the melt passes through the purifying chamber, large-size non-metal impurities are effectively removed, then after the melt passes through a 40-50 ppi foamed ceramic filter plate, the non-metal impurities above 10 micrometers are completely removed, the melt passes through the filter plate from bottom to top, impurity particles are blocked at the lower end of the filter, and when the impurity particles are agglomerated to a certain size, the impurity particles fall off and settle from the filter due to self weight, so that the self-purification of the filter is realized, and the service life of the filter is greatly prolonged.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure, 1 is a variable frequency motor, 2 is a hopper, 3 is a screw, 4 is purified gas, 5 is gas-powder flow, 6 is a gas-powder mixing chamber, 7 is an offset rotary blowing device, 8 is a melt inlet, 9 is a purifying chamber, 10 is a crucible, 11 is a filter chamber, 3 is a ceramic foam filter plate, and 14 is a partition plate.

Detailed Description

The aluminum melt flows into the purifying chamber 9 from top to bottom from the melt inlet 8 at the flow rate of 400kg/h, and the temperature of the aluminum melt is 750 ℃; the diameter of the bottom of the purifying chamber 9 is 400mm, and the liquid level height is 350 mm; putting the dried refining agent into a hopper 2, adjusting the rotating speed of a control screw rod 3 of a variable frequency motor 1 to ensure that the flow rate of the refining agent is 0.6kg/h, blowing industrial argon with the purity of 99.9% into a gas-powder mixing chamber 6 at the gas inflow of 160m1/min and the gas pressure of 0.1MPa, and fully mixing to form a gas-powder flow 5 and introducing the gas-powder flow into an offset rotary blowing device 7; the diameter of a rotor of the offset rotary powder spraying device 7 is 40mm, the distance from the rotor to the bottom of the purifying chamber is 60mm, the distance from a central shaft of a rotor to the center of the purifying chamber 9 is 100mm, the rotating speed of the rotor is 600rpm, and the shearing action of the rotor forms small and uniform bubbles which slowly rise and disperse and distribute a refining agent, and the small bubbles collide with a reverse melt to carry out degassing and impurity removal; the treated melt enters a filter chamber 11, then passes through a filter plate 13, a 50ppi foamed ceramic filter plate, from bottom to top, and finally flows out of a melt outlet 12. In the purification treatment process, the liquid level is stable and has no vortex, the chemical efficiency and the melt quality are improved, and the hydrogen content can be obtained to be 0.08 ml/100 g; the non-metallic inclusion below 10 μm is less than 0.02% of high-quality aluminum melt.

Claims (5)

1. The utility model provides an aluminum alloy melt biasing dusting purification's device, its characterized in that includes by inverter motor (1), hopper (2), screw rod (3), the spiral feed ration gas powder mixing mechanism that gas powder mixing chamber (6) are constituteed, biasing rotatory jetting device (7) of being connected with gas powder mixing mechanism, crucible (10) of being separated into clean room (9) and filter chamber (11) by baffle (14), set up ceramic foam filter (13) above filter chamber (11), fuse-element import (8) are established above clean room (9), fuse-element top-down flows through clean room (9), fuse-element export (12) are established above filter chamber (11), the fuse-element after the purification flows from fuse-element export (12) after passing through filter (13) from bottom to top, purified gas (4) are blown into in gas powder mixing chamber (6), the refining agent is put into hopper (2), drive screw rod (3) ration by inverter motor (1) and flow into gas powder mixing chamber (6) and purified gas (4) in with the clean gas (4) ) Fully mixing to form gas powder flow (5), and then introducing the gas powder flow into an offset rotary blowing device (7) to form fine and uniform purified bubbles which disperse and distribute the refining agent on the surface.

2. The aluminum alloy melt offset powder injection purification device according to claim 1, wherein the rotation speed of the screw (3) is controlled by the variable frequency motor (1), and the quantitative feeding of the refining agent into the gas-powder mixing chamber (6) can be realized.

3. The aluminum alloy melt bias powder injection purification device according to claim 1, wherein the content of the refining agent in the gas powder flow (5) is 0.1-0.5% of the melt flow at the melt inlet (8).

4. The aluminum alloy melt offset powder spraying purification device according to claim 1, wherein the distance from the rotary head of the offset rotary spraying device (7) to the bottom of the purification chamber (9) is 50-300 mm, and the distance from the central axis of the rotary head to the center of the purification chamber (9) is 1/5-1/3 of the diameter of the bottom of the purification chamber (9).

5. The aluminum alloy melt bias powder injection purification device according to claim 1, wherein the ceramic foam filter plate (13) has a specification of 40-50 ppi.