CN101781712A - Launder type online degassing device - Google Patents

Abstract

A launder-type online degassing device in the technical field of metal smelting, comprising: a launder shell, a degassing chamber, a ventilating brick, a thermal insulation cover, an exhaust port, a first baffle, a second baffle, an intermediate baffle, an inlet Air port, inlet and outlet, there is a degassing chamber inside the shell of the launder, the heat preservation cover is movably connected with the shell of the launder, the heat preservation cover is provided with an exhaust port, the two ends of the degassing chamber are provided with an inlet and an outlet, and the degassing chamber There is a middle baffle in the middle, a first baffle between the middle baffle and the inlet, a second baffle between the middle baffle and the outlet, the bottom of the first baffle and the second baffle and the degassing There is a gap between the chambers, the bottom of the middle baffle is fixedly connected with the degassing chamber, the breathable brick is embedded in the bottom of the degassing chamber and arranged between the first baffle, the second baffle and the middle baffle, the breathable brick There is an air inlet at the bottom. The site space requirement is small, and the submersible baffle and heat preservation cover are used to reduce the reabsorption and surface oxidation of the aluminum liquid after degassing; the degassing and purification effect is good.

Description

Launder type online degassing device

technical field

The invention relates to a device in the technical field of metal smelting, in particular to a launder-type online degassing device.

Background technique

With the continuous development of aluminum alloy applications, the requirements for its inherent quality are also getting higher and higher. Clean melt is the key to ensure the metallurgical quality of aluminum alloy materials. Among the factors affecting the purity of the melt, the precipitation of hydrogen in the melt during the solidification process will lead to defects such as pores and porosity, which is fatal to high-quality aluminum materials, and it not only destroys the internal continuity, reduces the effective cross-sectional area and is the source of cracks. Therefore, degassing plays an important role in the production of high-quality aluminum.

In the aluminum industry, the degassing effect is mainly ensured by the online degassing device outside the furnace, and the dissolved hydrogen is brought out by introducing a purified gas (usually nitrogen or argon) into the aluminum liquid. In recent years, breathable bricks, which are widely used in the steelmaking industry, have begun to be used in the aluminum industry, and the corresponding breathable bricks and degassing systems for aluminum refining have been developed, which have achieved good results in static furnaces or ladles, and have begun to be used in Online degassing device. Compared with rotary jet degassing, the online degassing device using ventilating bricks cancels moving parts such as graphite rotors, which greatly simplifies the equipment, and at the same time reduces the fluctuation of the liquid level of the aluminum melt and the resulting surface suction and oxidation, so , has obvious advantages in terms of equipment cost, operation and maintenance.

After searching the literature of the existing technology, it was found that the Chinese utility model patent application number: 200720004056, name: aluminum melt dehydrogenation device, the device is a box structure, the ventilation brick is installed at the bottom of the degassing box, and its hydrogen removal efficiency reaches 40 % or more, the hydrogen content in the aluminum melt after treatment can be reduced to 0.12-0.10ml/100gAl. The degassing box used in the device holds about 220kg of molten aluminum. Since the degassing device belongs to an open box structure, and the degassing chamber is square, the bottom is square and the ventilated bricks are evenly arranged, so it is easy to form degassing dead corners at the corners, and there is insufficient degassing. Inhalation and other problems, and a large amount of aluminum liquid needs to be drained when changing varieties, resulting in metal loss.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a trough-type online degassing device, which forms a reasonable aluminum liquid flow path by setting baffles, reduces degassing dead angles, and improves the utilization efficiency of purified gas; and adopts the following The submersible baffle and heat preservation cover form a closed space to prevent air from entering the degassing chamber, effectively reducing the inhalation of molten aluminum and surface oxidation. The compact structure can greatly reduce the loss of raw materials when changing alloy varieties.

The present invention is achieved through the following technical solutions, the present invention includes: launder shell, degassing chamber, breathable brick, heat preservation cover, exhaust port, first baffle, second baffle, intermediate baffle, air inlet, inlet and the outlet, wherein: there is a degassing chamber inside the launder shell, the heat preservation cover is movably connected with the launder shell, the heat preservation cover is provided with an exhaust port, the two ends of the degassing chamber are provided with an inlet and an outlet, and the degassing chamber There is a middle baffle in the middle, a first baffle between the middle baffle and the inlet, a second baffle between the middle baffle and the outlet, the bottom of the first baffle and the second baffle and the degassing chamber There is a gap between them, the bottom of the middle baffle is fixedly connected with the degassing chamber, the breathable brick is embedded in the bottom of the degassing chamber and arranged between the first baffle, the second baffle and the middle baffle, the breathable brick There is an air inlet at the bottom.

The tops of the first and second baffles are flush with the top of the degassing chamber, and a gap of 50-250 mm is provided between the bottoms of the first and second baffles and the degassing chamber.

The distance between the first baffle and the inlet and the distance between the second baffle and the outlet are 200-300mm.

An insulation layer is provided between the launder shell and the degassing chamber.

The height of the intermediate baffle is two-thirds of the height of the degassing chamber.

The heat preservation cover is located on the top of the launder shell, and is movably connected with the launder shell through hinges.

The heat preservation cover, the first baffle, the second baffle and the degassing chamber form a closed space.

The degassing chamber is made of refractory material and is prefabricated with non-stick aluminum castables.

The insulation layer is made of aluminum silicate board.

The air-permeable bricks are arranged equidistantly in a "one" shape.

The invention can be conveniently connected to any aluminum smelting furnace or a launder system between a standing furnace and a casting machine to realize online degassing and purification of molten aluminum before casting. The molten aluminum passes through the inlet, and enters the degassing chamber submerged through the first baffle. The purified gas passes through the gas inlet and diffuses into the molten aluminum in the form of bubbles from the end face of the breathable brick. When the bubbles float up, the hydrogen in the molten aluminum Continuously enter through diffusion until the bubbles escape from the surface of the aluminum liquid, forming a protective atmosphere above the aluminum liquid, and continuously discharged from the exhaust hole; the degassed aluminum liquid flows out from the bottom of the second baffle at the other end through the outlet , for subsequent filtration and purification treatment or directly into the casting machine for casting. When in use, the number of breathable bricks can be reasonably selected according to the flow rate of molten aluminum, so that the metal gas consumption ratio can be kept at 0.14-0.35L/kg.

Compared with the prior art, the present invention has the following advantages: the structure of the device is compact, the site space requirement is small, no additional heat preservation and heating device is needed, and there is almost no dry material when changing the alloy type; the submerged baffle and heat preservation cover are adopted , forming a closed degassing chamber to block the air, reducing the re-absorption and surface oxidation of the aluminum liquid after degassing; the degassing and purification effect is good, and the hydrogen content in the aluminum melt after treatment can be reduced to 0.12-0.10mm/100gAl.

Description of drawings

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

Detailed ways

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

As shown in Figure 1, this embodiment includes: including: launder shell 1, degassing chamber 2, ventilating brick 3, heat preservation cover 4, exhaust port 5, first baffle 6, second baffle 7, intermediate baffle Plate 8, inlet 9, outlet 10 and air inlet (not shown in the figure), wherein: the interior of launder shell 1 is provided with degassing chamber 2, heat preservation cover 4 and launder shell 1 are connected movably, and heat preservation cover 4 is provided with Exhaust port 5, the two ends of the degassing chamber 2 are provided with an inlet 9 and an outlet 10, the middle part of the degassing chamber 2 is provided with an intermediate baffle 8, and a first baffle 6 is arranged between the intermediate baffle 8 and the inlet 9, A second baffle 7 is provided between the intermediate baffle 8 and the outlet 10, and there is a gap between the bottom of the first baffle 6 and the second baffle 7 and the degassing chamber, and the bottom of the intermediate baffle 8 and the degassing chamber 2 Fixedly connected, the breathable brick 3 is embedded in the bottom of the degassing chamber 2 and arranged in the gap between the first baffle 6, the second baffle 7 and the middle baffle 8, and the bottom of the breathable brick 3 is provided with an air inlet.

An insulating layer 11 is provided between the launder shell 1 and the degassing chamber 2, which can reduce the temperature loss of the molten aluminum in the degassing device.

The thermal insulation layer 11 is made of aluminum silicate plate.

The launder shell 1 is made of steel to ensure that the entire degassing device has sufficient strength.

The height of the middle baffle 8 is two-thirds of the height of the degassing chamber 2, which can ensure a stable flow rate during the flow of the aluminum liquid, and the middle baffle 8 can force the aluminum melt to form convection in the vertical direction, increasing and purifying exposure to gas. The number of intermediate baffles 8 can also be multiple, which can enhance the purification effect.

The heat preservation cover 4 is located on the top of the launder shell 1, and is movably connected with the launder shell 1 through a hinge 12, so that the heat preservation cover 4 can be opened and closed freely. The heat preservation cover 4 can keep the whole degassing device airtight, reduce the heat loss at the top of the degassing device and reduce the reabsorption and surface oxidation of the aluminum melt.

The degassing chamber 2 is made of refractory material, prefabricated with non-stick aluminum castable, and can work for a long time under the scour of aluminum melt.

The air-permeable bricks 3 are arranged equidistantly in a "one" shape.

The tops of the first baffle plate 6 and the second baffle plate 7 are flush with the top of the degassing chamber 2, and the aluminum liquid can only enter and flow out from the bottom of the first baffle plate 6 and the second baffle plate 7 in a submerged manner The degassing chamber 2, which is always calm above the liquid surface, can block the air, and can play a role in blocking the scale or scum on the surface of the aluminum liquid; the bottom of the first baffle 6 and the second baffle 7 and the degassing chamber 2 There is a 100mm gap between them. The distance between the first baffle plate 6 and the inlet 9 and the distance between the second baffle plate 7 and the outlet 10 are both 200mm, to facilitate cleaning. The first baffle plate 6 , the second baffle plate 7 and the intermediate baffle plate 8 are poured and formed simultaneously when the refractory material degassing chamber 2 is poured.

In the process of degassing and purifying, close the heat preservation cover 4, the molten aluminum enters the degassing chamber 2 through the first baffle plate 6, and the purified gas diffuses into the molten aluminum from the bottom in the form of air bubbles through the ventilating brick 3, and the bubbles in the During the floating process, the hydrogen in the molten aluminum continuously enters through diffusion until the air bubbles escape from the surface of the molten aluminum, forming a protective atmosphere above the molten aluminum, which is continuously discharged from the exhaust port 5, and the degassed molten aluminum is released from the second The bottom of the baffle 7 flows out. The device has a good degassing and purification effect, and the hydrogen content in the aluminum melt can be reduced to 0.12-0.10mm/100gAl after treatment.

Claims (9)

1. A chute-type online degassing device, comprising: a chute shell, a degassing chamber, a ventilating brick, a thermal insulation cover, an exhaust port, an air inlet, an inlet and an outlet, and it is characterized in that it also includes: a first baffle , the second baffle and the middle baffle, wherein: a degassing chamber is provided inside the launder shell, the heat preservation cover is movably connected with the launder shell, the heat preservation cover is provided with an exhaust port, and the two ends of the degassing chamber are provided with inlets and the outlet, there is an intermediate baffle in the middle of the degassing chamber, the height of the intermediate baffle is two-thirds of the height of the degassing chamber, a first baffle is provided between the intermediate baffle and the inlet, and a first baffle is arranged between the intermediate baffle and the outlet. There is a second baffle in between, and there is a gap between the bottom of the first baffle and the second baffle and the degassing chamber, the bottom of the middle baffle is fixedly connected with the degassing chamber, and the breathable brick is embedded in the degassing chamber The bottom is arranged between the first baffle, the second baffle and the middle baffle, and the bottom of the permeable brick is provided with an air inlet. 2. The chute-type online degassing device according to claim 1, wherein the tops of the first baffle and the second baffle are flush with the top of the degassing chamber, and the first baffle and the second baffle are A gap of 50-250 mm is provided between the bottom of the second baffle and the degassing chamber. 3. The launder-type online degassing device according to claim 1, wherein the distance between the first baffle and the inlet and the distance between the second baffle and the outlet are 200-300 mm. 4. The chute-type online degassing device according to claim 1, wherein an insulating layer is provided between the chute shell and the degassing chamber. 5. The launder-type online degassing device according to claim 1, wherein the heat preservation cover is located on the top of the launder shell, and is movably connected with the launder shell by a hinge. 6. The trough-type online degassing device according to claim 1, characterized in that, the heat preservation cover, the first baffle, the second baffle and the degassing chamber form a closed space. 7. The launder-type online degassing device according to claim 1, wherein the degassing chamber is made of refractory material and is prefabricated with non-stick aluminum castable. 8. The trough-type online degassing device according to claim 4, wherein the insulation layer is made of aluminum silicate plate. 9. The trough-type online degassing device according to claim 1, characterized in that, the air-permeable bricks are equidistantly arranged in a "one" shape.

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