CN209798050U - An aluminum alloy melt compound injection 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

An aluminum alloy melt compound injection purification device

technical field

The utility model belongs to the field of nonferrous metal metallurgy, in particular to an aluminum alloy melt compound injection purification device.

Background technique

Melt purification is a key technology to ensure the metallurgical quality of aluminum alloy materials. The main purpose of purifying the aluminum alloy melt is to remove the hydrogen content and oxidized inclusions in the melt, thereby improving the quality of the aluminum alloy. The methods of purifying aluminum melt mainly include: solvent method, gas blowing method, rotary blowing method, etc. The commonly used refining agent is added to purify aluminum melt, although it can play a certain role in refining, but because the refining agent is easy to gather together, in order to achieve the effect, the amount added will be large. Therefore, the refining method of gas + solvent has also appeared. After searching, it was found that "a spraying device" participated in the patent application number: 20092014473.8. After mixing the gas and solvent, it is directly injected into the melt, and the solvent is distributed on the surface of the bubbles in the melt to achieve the effect of double refining. But in this method, the bubbles formed are not small enough, and the amount of solvent is relatively large. Shanghai Institute of Mechanical and Electrical Engineering has developed "a method and device for degassing aluminum melt with top-angle compound blowing", see patent application number: 0910044935.9, the purification device blows the purified gas from the rotating The peripheral air inlet of the purification unit is blown into the aluminum melt. In these methods, the volume of the clean room is large and square, and the melt in the periphery and corner areas of the clean room cannot be in contact with a sufficient number of bubbles during the refining process, resulting in a purification dead zone.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art, to provide a continuous, without any purification dead angle, on-line processing of aluminum melt, which significantly increases the refining agent purification interface, range of action, prolonging the action time, low The amount of refining agent, easy to replace, high service life filter, simple structure, low cost aluminum melt purification device.

The utility model is realized in the following ways:

A compound injection purification device for aluminum alloy melt, which is characterized in that it includes a screw-feed quantitative gas-powder mixing mechanism composed of a frequency conversion motor, a hopper, a screw, and a gas-powder mixing chamber, and a rotary blowing device connected with the gas-powder mixing mechanism, The crucible is divided into a clean room and a filter room by a partition, and a ceramic foam filter plate is arranged above the filter room. The melt inlet is set above the clean room, the melt flows through the clean room from top to bottom, the melt outlet is set above the filter room, and the purified melt passes through the filter plate from bottom to top and then flows out from the melt outlet. The clean room and the filter room are connected through the flow channel, and the clean room is equipped with a rotary blowing device and a bottom blowing device composed of clean gas and air-permeable bricks; the clean gas is blown into the gas-powder mixing room, and the refining agent is put into the hopper. The motor drives the screw to flow quantitatively into the gas-powder mixing chamber and fully mixes the purified gas to form a gas-powder flow, which is then passed into the rotary blowing device to form fine and uniform purified bubbles that disperse the refining agent on the surface, and the purified gas is formed through the breathable bricks There are uniform small bubbles all over the clean room, and the two types of bubbles carry out composite blowing and purification treatment on the aluminum melt.

The above aluminum alloy melt compound injection purification device is characterized in that the screw speed is controlled by the frequency conversion motor, which can realize quantitative delivery of refining agent into the air powder mixing chamber.

The compound injection purifying device for aluminum alloy melt is characterized in that the refining agent content in the gas powder flow is 0.1-0.5% of the melt flow rate at the melt inlet.

The above aluminum alloy melt compound injection purification device is characterized in that the shape and size of the air-permeable brick are consistent with the clean room, and its aperture is 10-100 μm.

The aluminum alloy melt compound injection purification device is characterized by a ceramic foam filter plate with a specification of 40-50ppi.

When the utility model is used, the dry refining agent is put into the hopper, and the frequency conversion motor gives the screw a reasonable rotational speed, so that the feeding flow rate of the refining agent is 0.1-0.5% of the melt flow rate, and the purified gas is fully mixed in the gas-powder mixing chamber. Finally, it is blown into the rotary blowing device, sheared by the high-speed rotating blades, and the refining agent will be dispersed and distributed on the surface of the fine and uniform purification bubbles. The dispersed refining agent increases the concentration gradient of hydrogen diffusion into the bubbles and the wettability of inclusions, so it is easier to absorb hydrogen and adsorb inclusions, and the melt is also stirred, thereby significantly increasing the refining agent and purifying bubbles. The effective interface and range of action prolong the contact time, and the stirring also promotes the aggregation of fine inclusions, which is more conducive to flotation removal. At the same time, the purified gas is blown into the bottom breathable brick which is consistent with the shape and size of the bottom of the clean room, which can form a large number of bubbles with a diameter of 5mm to fill the clean room, completely eliminating the dead corner of the clean room. The two types of purification bubbles rise slowly in the purification chamber, fully mix and collide with the descending melt, the hydrogen in the melt diffuses into the rising bubbles, and at the same time the rising bubbles collide with the non-metallic inclusions in the melt, adsorb and carry them float up. After the melt passes through the clean room, the large-sized non-metallic inclusions are effectively removed, and then after passing through the 40-50ppi foam ceramic filter plate, the non-metallic inclusions above 10μm are completely removed, and a pure and high aluminum alloy melt is obtained. Meet the requirements of industrial production. The melt passes through the filter plate from bottom to top, and the impurity particles are blocked at the lower end of the filter. When they agglomerate to a certain size, they will fall off and settle from the filter due to their own weight, thereby realizing the self-purification of the filter and greatly improving the quality of the filter. service life.

Description of drawings

Fig. 1 is a structural representation of the utility model

In the figure, 1 is a frequency conversion motor, 2 is a hopper, 3 is a screw, 4 is a purified gas, 5 is a gas-powder flow, 6 is a gas-powder mixing chamber, 7 is a melt inlet, 8 is a crucible, 9 is a clean room, 10 12 is a filter chamber, 13 is a melt outlet, 14 is a ceramic foam filter plate, 15 is a dividing plate, and 16 is a rotary blowing device.

Detailed ways

The aluminum melt flows into the purification chamber 9 from the melt inlet 7 from top to bottom at a flow rate of 350kg/h, and the temperature of the aluminum melt is 750°C; the bottom diameter of the purification chamber 9 is 300mm, and the liquid level is 350mm; the dry refining agent is put into In the hopper 2, adjust the frequency conversion motor 1 to control the speed of the screw 3, so that the flow rate of the refining agent is 0.5kg/h, and the industrial argon gas with a purity of 99.9% is blown into the gas powder at an intake rate of 160ml/min and a gas pressure of 0.1MPa. Chamber 6, after fully mixing, the air powder flow 5 is passed into the rotary blowing device 16, which is 60mm away from the bottom of the purification chamber 9, and the rotor rotation speed is 600rpm. The shearing action of the rotor forms a fine and uniform mixture of slowly rising and dispersed refining agents. Small bubbles collide with the reverse melt to remove gas and impurities; the gas blown into the bottom breathable brick 10 is argon with a purity of 99.9%, the gas flow rate is 0.18m3/h, and the gas pressure is 0.1MPa. 10. The pore size is 10 μm and the diameter is 400 mm, which can produce a uniform effect with a diameter of 3 mm in the purification chamber 9 and completely eliminate the purification bubbles in the purification blind area. The processed melt enters the filter chamber 12 , then passes through the ceramic foam filter plate 14 with a specification of 50 ppi from bottom to top, and finally flows out from the melt outlet 13 . During the purification process, the liquid surface is stable without vortex, the melting efficiency and the quality of the melt are improved, and a high-quality aluminum melt with a hydrogen content of 0.08ml/100g and a non-metallic inclusion below 10μm of less than 0.02% can be obtained.

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.