Aluminum alloy super-purification refining method

Abstract

The invention discloses an aluminum alloy super-purification refining method, and aims to reduce the hydrogen content, oxide inclusion content and harmful alloy element content in the aluminum alloy. The method comprises the following steps of: arranging two aluminum alloy blanks to be melted on a lifting mechanism and connecting the two aluminum alloy blanks to the positive electrode and the negative electrode of a melting power supply respectively; arranging a non-metal crucible under the aluminum alloy blanks, placing the slag in the crucible and heating the slag to the working temperature of between 630 and 700 DEG C to change the slag into a liquid state; starting the lifting mechanism to drop the aluminum alloy blank and extend the lower end into the liquid-state slag, wherein the immersion depth is 10mm, and opening cooling water; preserving heat for a certain time and switching on the melting power supply after the slag in contact with the aluminum alloy blank is remelted, wherein the current is 250 to 280A and the voltage is 8 to 9V; automatically feeding by the lifting mechanism according to a voltage value and feeding downwards when the voltage value is more than 9V; stopping the feeding when the voltage value is less than 8V; when the feeding is stopped, increasing the voltage value along with the continuous melting of the aluminum alloy blank; automatically adjusting the feeding process by the lifting mechanism until all the aluminum alloy blanks are fed into the melting crucible by a feeding mechanism; ending the melting and closing the melting power supply when the feeding mechanism feeds the aluminum alloy blanks to the bottommost part and the voltage is more than 9V; and lifting the lifting mechanism, scratching the slag in the crucible out and casting an ingot with the refined aluminum alloy liquid or directly pouring a cast.

Description

technical field [0001] The invention relates to an aluminum alloy ultra-purifying refining method. Background technique [0002] Aluminum alloy melt purification technology is based on physical and chemical principles and corresponding process measures to remove gases, inclusions and harmful elements in liquid metal in order to obtain pure metal melt. The purification of aluminum alloy melt is the key technology to ensure the metallurgical quality of materials, and it is a problem widely concerned by the academic and business circles. The methods currently used are flux purification technology and inert gas purification technology. Refining agent is added to the body, and after stirring and standing still, the effect of removing hydrogen and oxidized inclusions is realized, which is labor intensive and seriously pollutes the environment; the inert gas purification technology is to pass inert gas through the molten aluminum alloy melt, after blowing The head rotates and stan...

AI Technical Summary

Problems solved by technology

The purification of aluminum alloy melt is the key technology to ensure the metallurgical quality of materials, and it is a problem widely concerned by the academic and business circles. The methods currently used are flux purification technology and inert gas purification technology. Refining agent is added to the body, and after stirring and standing still, the effect of removing hydrogen and oxidized inclusions is realized, which is labor intensive and seriously pollutes the environment; the inert gas purification technology is to pass inert gas through the molten aluminum alloy melt, after blowing The head rotates and stands still to remove hydrogen, and the degassing effect is greatly affected by the environment

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