CN209798050U - Aluminum alloy melt composite blowing purification device - Google Patents

Abstract

The utility model belongs to the non ferrous metal purifies the field, relates to a compound jetting purifier of aluminum alloy fuse-element. 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), a rotary blowing device (16) connected with the gas-powder mixing mechanism, a bottom blowing device consisting of purified gas (11) and air bricks (10), a crucible (8) separated into a purifying chamber (9) and a filtering chamber (12) by a partition plate (15), and a ceramic foam filtering plate (14) arranged above the filtering chamber (12). The utility model discloses can realize not having purification dead angle, continuous high-efficient processing aluminium melt, obtain the ability of high-quality aluminum alloy.

Description

Aluminum alloy melt composite blowing purification device

Technical Field

The utility model belongs to the non ferrous metal metallurgy field especially relates to a compound jetting purifier of aluminum alloy fuse-element.

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. 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. The method has the advantages that the purifying chamber is large in volume and square, the melt at the periphery and corner areas of the purifying chamber cannot be in contact with a sufficient number of bubbles in the refining process, and a purifying blind area is generated.

Disclosure of Invention

An object of the utility model is to overcome above-mentioned prior art not enough, provide one kind can be continuous, do not have any purification dead angle, on-line processing aluminium melt, show effect interface, effect scope, 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 composite blowing purifier for molten aluminium alloy is composed of a spiral feeding quantitative gas-powder mixer consisting of frequency-variable motor, hopper, screw bolt and gas-powder mixer, a rotary blowing unit connected to said gas-powder mixer, and a crucible with filter chamber and filter chamber, and a ceramic foam filter plate above said 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. The purifying chamber is communicated with the filtering chamber through a flow passage, and a rotary blowing device and a bottom blowing device consisting of purified gas and air bricks are arranged in the purifying chamber; 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, then the gas-powder flow is introduced into the rotary blowing device to form fine and uniform purified bubbles which are dispersed and distributed on the surface of the refining agent, meanwhile, the purified gas forms small bubbles which are uniformly distributed in the whole purifying chamber through air bricks, and the two types of bubbles carry out composite blowing purification treatment on the aluminum melt.

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

The aluminum alloy melt composite blowing purification device is characterized in that the content of the refining agent in the gas powder flow is 0.1-0.5% of the melt flow at the melt inlet.

The aluminum alloy melt composite blowing purification device is characterized in that the shape and the size of the air brick are consistent with those of a purification chamber, and the aperture of the air brick is 10-100 mu m.

The aluminum alloy melt composite blowing purification device 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 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. Meanwhile, purified gas is blown into the bottom air brick with the shape and the size consistent with the bottom of the purifying chamber, a large number of bubbles with the diameter of 5mm filled in the purifying chamber can be formed, and the purifying dead angle is completely eliminated. The two types of purified bubbles 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 nonmetal impurities in the melt, adsorb the bubbles and carry the bubbles to float. After the melt passes through the purification chamber, large-size non-metal inclusions are effectively removed, and then after 40-50 ppi foamed ceramic filter plates, non-metal inclusions above 10 micrometers are completely removed, so that a pure and high aluminum alloy melt is obtained, and the requirements of industrial production are completely met. The fuse-element passes through the filter board from bottom to top, and the foreign particles are by the separation at the filter lower extreme, and when they reunite to certain size, can drop from the filter and subside because of the dead weight to realize the self-purification of filter, improved the life of filter greatly.

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 a melt inlet, 8 is a crucible, 9 is a purifying chamber, 10 is an air brick, 12 is a filtering chamber, 13 is a melt outlet, 14 is a foamed ceramic filtering plate, 15 is a partition plate, and 16 is a rotary blowing device.

Detailed Description

The aluminum melt flows into a purifying chamber 9 from top to bottom from a melt inlet 7 at the flow rate of 350kg/h, and the temperature of the aluminum melt is 750 ℃; the diameter of the bottom of the purifying chamber 9 is 300mm, and the liquid level height is 350 mm; putting a 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 0.5kg/h, blowing industrial argon with the purity of 99.9% into a gas-powder mixing chamber 6 at the air inflow of 160ml/min and the gas pressure of 0.1MPa, fully mixing to form a gas-powder flow 5, introducing the gas-powder flow 5 into a rotary blowing device 16, wherein the distance between the gas-powder flow 5 and the bottom of a purifying chamber 9 is 60mm, the rotating speed of a rotor is 600rpm, and the shearing action of the rotor forms small and uniform bubbles which slowly rise and disperse and distribute the refining agent, and colliding with a reverse melt to remove impurities; the gas blown into the gas permeable bricks 10 at the bottom adopts 1-grade argon with the purity of 99.9 percent, the gas flow is 0.18m3/h, the gas pressure level is 0.1MPa, the pore diameter of the gas permeable bricks 10 is 10 mu m, the diameter is 400mm, and the gas permeable bricks can generate uniform gas bubbles with the diameter of 3mm in the purifying chamber 9, thereby completely eliminating the purifying bubbles of the purifying dead zone. The processed melt enters a filter chamber 12, then passes through a foamed ceramic filter plate 14 with the specification of 50ppi from bottom to top, and finally flows out from a melt outlet 13. 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 0.08ml/100 g; the non-metallic inclusion below 10 μm is less than 0.02% of high-quality aluminum melt.

Claims (5)

1. A composite blowing and purifying device for aluminum alloy melt is characterized by comprising 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), a rotary blowing device (16) connected with the gas-powder mixing mechanism, a crucible (8) separated into a purifying chamber (9) and a filtering chamber (12) by a partition plate (15), a ceramic foam filtering plate (14) is arranged above the filtering chamber (12), a melt inlet (7) is arranged above the purifying chamber (9), a melt flows through the purifying chamber (9) from top to bottom, a melt outlet (13) is arranged above the filtering chamber (12), the purified melt flows out from the melt outlet (13) after passing through the filtering plate (14) from bottom to top, the purifying chamber is communicated with the filtering chamber through a flow channel, and the rotary blowing device (16) and a bottom blowing device consisting of purified gas (4) and air bricks (10) are arranged in the purifying chamber; purified gas (4) is blown into the gas-powder mixing chamber (6), a refining agent is placed into the hopper (2), a variable frequency motor (1) drives a screw (3) to quantitatively flow into the gas-powder mixing chamber (6) and fully mix with the purified gas (4) to form a gas-powder flow (5), then the gas-powder flow is introduced into a rotary blowing device (16) to form fine and uniform purified bubbles which are dispersed and distributed on the surface of the refining agent, meanwhile, the purified gas (4) forms uniform small bubbles which are distributed in the whole purifying chamber (9) through air bricks (10), and the two types of bubbles carry out composite blowing and purification treatment on aluminum melt.

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

3. the aluminum alloy melt composite blowing purification device of 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 (7).

4. The aluminum alloy melt composite blowing purification device of claim 1, wherein the shape and size of the air brick (10) is consistent with the bottom of the purification chamber (9), and the aperture of the air brick is 10-100 μm.

5. The aluminum alloy melt composite blowing purification device according to claim 1, wherein the ceramic foam filter plate (14) has a specification of 40 to 50 ppi.