Purification and degassing device for continuous aluminum melting furnace

Abstract

This invention provides a purification and degassing device for a continuous aluminum melting furnace that effectively solves the problem of high defect rates in manufactured aluminum castings due to the generation of substances such as bubbles, slag holes, and impurities in the molten aluminum during conventional aluminum melting. [Solution] The purification and degassing device for a continuous aluminum melting furnace according to the present invention is provided with a furnace body 1. The furnace body 1 is provided with a melting area 10 where a melting heater 2 is provided, a heat retention area 11 where a heat retention heater 3 is provided, and a molten metal removal area 12. A plurality of gas diffusers 4 are provided at the bottom 13 of the furnace body in the heat retention area 11, and each of the gas diffusers 4 is provided with an air supply pipe 40 connected to an inert gas conveying device.

Description

Technical Field

[0001] The present invention relates to a purification and degassing device for a continuous aluminum melting furnace, in which a gas diffuser is provided at the bottom of the furnace body of the continuous aluminum melting furnace, and the purity of molten aluminum can be improved.

Background Art

[0002] Conventionally, generally in the process of melting aluminum in a continuous aluminum melting furnace, when aluminum and aluminum scraps are continuously added to molten aluminum and melted together, a lot of impurities such as gas and various non-metallic inclusions are released when melting aluminum. These gases and impurities directly affect the purity of molten aluminum, and when cooled and manufactured into aluminum casting products, defective products such as bubbles, slag holes, and inclusions are generated, and the defective rate of aluminum castings is extremely high, unable to meet the demand for precision machining. Therefore, in order to solve the problem of the defective rate that may occur during aluminum melting, a nitrogen introduction pipe is inserted into the aluminum melting furnace, and at the end of the nitrogen introduction pipe, a gas ejection port for ejecting nitrogen gas is provided, and nitrogen gas is blown into the molten aluminum so that the nitrogen gas can gradually float upward from the bottom surface of the molten aluminum, and the gas and impurities in the molten aluminum are attached to the nitrogen gas and taken out of the molten aluminum. However, all of these conventional purification and degassing devices eject nitrogen gas fixed in one direction, so the distribution of nitrogen gas in molten aluminum is not uniform, and the residence time in molten aluminum is too short, so the purification effect on molten aluminum is not excellent. In addition, a shaft that is a vertical tubular body is used and rotated by a motor together with the shaft, and nitrogen gas is blown into molten aluminum by the rotating shaft. However, in the method of blowing nitrogen gas by the rotation of such a shaft, vortices are generated in the furnace body during rotation, destroying the surface oxide film, and impurities are卷入 into the molten aluminum downward, and the purification effect on molten aluminum is not excellent, and pure molten aluminum cannot be obtained, and defective products such as bubbles, slag holes, and impurity inclusions are likely to occur in aluminum castings, so the defective rate of aluminum castings is also quite high.

Summary of the Invention

[0003] The main objective of this invention is to provide a purification and degassing device for a continuous aluminum melting furnace, thereby effectively solving the drawback of high defect rates in manufactured aluminum castings caused by the generation of substances such as bubbles, slag holes, and impurities in the molten aluminum during conventional aluminum melting. [Means for solving the problem]

[0004] The purification and degassing device for a continuous aluminum melting furnace according to this invention is provided with a furnace body. The furnace body includes a melting area where a melting and heating device is installed, a heat retention area where a heat retention device is installed, and a molten metal removal area. The heating element is characterized by having multiple gas diffusers at the bottom of the furnace body, and each of the gas diffusers being equipped with an air supply pipe connected to an inert gas transport device. [Effects of the Invention]

[0005] The advantage of the purification and degassing device for a continuous aluminum melting furnace according to the present invention is that it reliably purifies impurities and gases in the molten aluminum, yields extremely high-purity molten aluminum, and allows for the production of high-purity aluminum castings after cooling. [Brief explanation of the drawing]

[0006] [Figure 1] This is a schematic diagram of an embodiment of the present invention. [Figure 2] This is a schematic diagram illustrating the use of aluminum melting and degassing in an embodiment of the present invention. [Modes for carrying out the invention]

[0007] The technical means used to achieve the above-described purpose and effects of this invention will be described below with reference to the drawings, with reference to preferred implementable embodiments.

[0008] An embodiment of the present invention, referring to Figure 1, mainly consists of a furnace body 1, which includes a melting area 10, a heat retention area 11, and a molten metal extraction area 12. A melting heater 2 is provided in the melting area 10, and a heat retention heater 3 is provided in the heat retention area 11. Multiple gas diffusers 4 are provided at the bottom 13 of the furnace body in the heat retention area 11, and an air supply pipe 40 is provided to each of the gas diffusers 4. The air supply pipe 40 is connected to an inert gas transport device (not shown), thus forming the structure of a continuous aluminum melting furnace.

[0009] The aluminum melting process of the continuous aluminum melting furnace according to this invention is as follows, with reference to Figure 2. Step (1): The aluminum ingot is placed in the melting region 10 of the furnace body 1, and the melting region 10 is heated by the melting heater 2 to melt the aluminum ingot into molten aluminum. Step (2): A slag remover is added to the molten aluminum in the melting area 10 of the furnace body 1. The slag remover reacts with impurities in the molten aluminum through thermal reaction and combines to form scum A, which floats to the surface of the molten aluminum. Step (3): Scum A on the surface of the molten aluminum is scraped off and removed from the furnace body 1. Step (4): The inert gas transport device injects inert gas (e.g., nitrogen gas) from an air supply pipe 40 located at the bottom 13 of the furnace body into the heat retention area 11 via a gas diffuser 4. The inert gas is diffused and ejected upward from the bottom 13 of the furnace body into the molten aluminum to degas it. By allowing the gas and impurities B remaining in the molten aluminum to adhere to the inert gas, the gas and impurities B remaining in the molten aluminum are removed and floated on the molten aluminum, thereby obtaining pure molten aluminum. Step (5): The pure molten aluminum, after being degassed in the heat retention area 11 and impurity B has been removed, is taken out from the molten metal extraction area 12 and cooled to produce a high-purity aluminum casting product.

[0010] This invention involves injecting inert gas through gas diffusers 4 located at the bottom 13 of the furnace body of a continuous aluminum melting furnace. The inert gas diffuses and ejects upward from the bottom 13 of the furnace body, and the inert gas sufficiently and uniformly adsorbs gases and impurities B in the molten aluminum, causing them to float to the surface of the molten aluminum. This invention reliably achieves degassing and slag removal effects on the molten aluminum in a continuous aluminum melting furnace, significantly improving the purity and yield of aluminum castings.

[0011] As described above, the present invention certainly achieves the desired purpose and effect, and is more ideal and practical than conventional inventions. However, the embodiments described above are merely for illustrative purposes of preferred embodiments of the present invention, and the embodiments do not limit the scope of the present invention. Any equivalent modifications and alterations made under other technical means disclosed herein are included within the scope of the present invention. [Explanation of Symbols]

[0012] 1 Furnace body 10 Melting area 11 Heat retention area 12 Molten metal extraction area 13 Furnace bottom 2 Melting heating machine 3 Insulation heating machine 4 Gas diffuser 40 Air supply pipe A: Scum B: Impurities

Claims

[Claim 1] A furnace body is provided, and the furnace body is provided with a melting area where a melting and heating machine is installed, a heat retention area where a heat retention machine is installed, and a molten metal extraction area. A purification and degassing device for a continuous aluminum melting furnace, characterized in that a plurality of gas diffusers are provided at the bottom of the furnace body in the heat retention area, and each of the gas diffusers is provided with an air supply pipe connected to an inert gas conveying device.

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