Vent plug for ventilation and stirring of bottom of smelting furnace and metal smelting furnace

Abstract

The invention relates to a vent plug for ventilation and stirring of the bottom of a smelting furnace. The vent plug is installed on the bottom of a furnace body of the smelting furnace and comprisesa ventilating core which is made of a high-temperature resisting material and is internally provided with air holes, the lower end face of the ventilating core is provided with a groove, and the groove is internally provided with an insertion hole. One end of a high-temperature resisting seamless pipe is provided with a first end expanding disk, the end portion of the high-temperature resisting seamless pipe is inserted into the insertion hole of the ventilating core, and the first expanding disk is located in the groove. A first refractory castable cured structural body is formed by curing high-strength refractory castable filled in the groove. A second refractory castable cured structural body is formed by curing high-strength refractor castable wrapping the ventilating core, the first refractory castable cured structural body and the outer surface of high-temperature resisting seamless pipe. The invention further relates to the metal smelting furnace comprising the vent plug. The vent plug is provided with multiple structures preventing the ventilating core from disengaging and multiple sealing structures and can reinforce the fixation of the ventilating core and the high-temperature resisting seamless pipe, and the service life of the whole furnace body is prolonged.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a venting plug used for ventilation and stirring at the bottom of a smelting furnace and a smelting furnace including the venting plug. Background technique [0002] The alloy liquid in the production process of aluminum alloy ingots and products needs to be refined. The traditional refining process is to place metal ingots in a metal smelting furnace, heat the metal into a liquid state, and then add gold components to the molten metal liquid, and add refining agents such as chloride salts and fluorine salts to make chloride salts and Refining such as fluorine salts reacts with the alloy liquid to obtain hydrogen-free bubbles. These small bubbles and refining agents are used to absorb hydrogen and oxidized inclusions during the floating process, and entrain them to the alloy liquid surface to achieve the purpose of degassing and slag removal. [0003] The existing aluminu...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the existing aluminum alloy smelting process has the following problems: (1) During the entire refining process, the number of times of opening and closing the furnace door is relatively large, the heat of the melt spreads greatly, and the temperature drop is large, so it is necessary to frequently fire and heat up. The standing heat preservation time often takes more than 30 minutes, so the energy consumption is very large

(2) Opening the furnace door multiple times (the furnace door is opened for at least 1h in the whole process) will also increase the probability of the melt contacting the outside air, causing the water vapor in the air and other substances containing H and O elements to enter the aluminum In the melt, the hydrogen content, oxide film and other indicators are all high

(3) The addition of refining agent in the refining process of aluminum melt will bring more slag, and the amount of refining agent directly determines the amount of second raking slag, increasing the cost of slag removal

(4) In addition to the above-mentioned problems, during the purification operation of refining agents, a large amount of toxic gas / dust containing chlorine and fluorine is often discharged, which brings a great burden to the supporting environmental protection facilities of the enterprise, not only the operating cost It is also easy to corrode the supporting equipment and facilities for environmental protection; at the same time, a large amount of aluminum slag containing chlorine and fluorine will be produced. After recycling the residual metal aluminum from the aluminum slag, fluorine-containing solids will be discharged, which will bring serious pollution to the surrounding environment.

(5) In addition, in the refining process of aluminum alloy melt, the uniformity of aluminum liquid and alloy composition will directly affect the quality of metal castings in the future

[0006] However, the existing metal smelting furnaces, including resistance furnaces, induction furnaces, gas / liquefied gas reverberatory furnaces, etc., are mostly made of regular, flat corundum or high-alumina refractory materials with high temperature resistance, wear resistance and impermeability. The chamber is defined by the furnace wall, and the furnace wall has a closable furnace door. Through the furnace door, the alloy composition, refining agent and slag are added, and the structure of the furnace body of the smelting furnace has not been adjusted for the aeration refining process. Corresponding development and improvement have limited the application of the ventilated refining process; in addition, during the use of the existing metal smelting furnace, the melt is prone to slagging at the bottom of the furnace body and the inner wall of the furnace body

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