Equipment for refining waste gas and waste slag in aluminum alloy through high-purity liquid nitrogen

Abstract

The invention relates to equipment for refining waste gas and waste slag in an aluminum alloy through high-purity liquid nitrogen, and belongs to the technical field of aluminum alloy waste gas and waste slag treatment equipment. A high-purity liquid nitrogen bottle, a gas storage tank, a gas removing machine and a furnace body are included and sequentially arranged. The high-purity liquid nitrogen bottle is provided with a gas supply pipe. A gas inlet pipe is arranged at the bottom of the gas storage tank. A gas outlet pipe is arranged at the upper portion of the gas storage tank. The gas removing machine comprises a bottom plate. The bottom plate is provided with a stand column. The stand column is provided with a beam. A first motor is arranged in the beam. The drive end of the first motor is provided with a graphite rotor. The graphite rotor is provided with a graphite rotation disc. A first pipeline is arranged between the gas supply pipe and the gas inlet pipe in a commutation manner. The gas outlet pipe is provided with a second pipeline passing through the beam. A channel for the second pipeline to pass through is formed in the graphite rotor and the graphite rotation disc.Through surface tension of nitrogen, after hydrogen in aluminum liquid is adsorbed, the aluminum liquid is discharged, exhausted gases are mainly hydrogen and nitrogen and are harmless, and hurt to the human bodies from the harmful gases is prevented.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy waste gas and slag treatment equipment, in particular to a device for refining waste gas and slag in aluminum alloys with high-purity liquid nitrogen. Background technique [0002] Aluminum alloys are easy to inhale gas from the air during the smelting process. The greater the humidity in the air, the more gas is inhaled. After inhaling the gas, there will be a large amount of hydrogen in the aluminum liquid. When the aluminum liquid solidifies at 660 degrees Celsius , the solubility of these hydrogens will drop sharply. Because the cooling rate is too fast, the temperature of the melt decreases, and the hydrogen gas cannot escape from the solidified aluminum, and the hydrogen gas remaining in the casting will form casting defects such as pinholes and looseness. Therefore, when refining the aluminum alloy melt, Gases and inclusions in the melt need to be removed. [0003] There is a refin...

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Problems solved by technology

[0003] There is a refining and degassing process in the smelting process of aluminum alloy. The existing refining and degassing process often uses a refining agent to press the refining agent into the molten aluminum. Because some components in the refining agent are easily decomposed at high temperatures, The generated gas is easy to react with hydrogen, has a strong adsorption force with slag inclusions, and quickly escapes from the melt, thereby removing waste gas and waste slag in the melt. The main component of the refining agent is NaNO3, and the refining agent will Gases such as N2, CO2 and NO will be generated, but NO is a poisonous gas, if inhaled by the operator, it will cause damage to the health of the operator

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