Apparatus and method for recycling magnesium alloy scrap

Abstract

The present invention is directed, in general, to an apparatus for recycling magnesium alloy scrap. In particular, an apparatus for recycling magnesium alloy scrap includes a melting furnace formed with a tapping part, having a first filter for removing impurities present in molten scrap, and capable of being tilted toward the tapping part; a first cleaning furnace disposed on a side of the melting furnace, having a gas injecting part for injecting an inert gas in the molten metal and capturing and removing impurities present in the molten metal, and capable of being tilted; a second cleaning furnace disposed on a side of the first cleaning furnace, and having a pump to tap a predetermined amount of the molten metal supplied from the first cleaning furnace and a second filter to remove impurities in pumped molten metal; and an ingot forming furnace disposed on a side of the second cleaning furnace, and configured to form an ingot using the predetermined molten metal supplied from the second cleaning furnace.

1 . An apparatus for recycling magnesium alloy scrap, comprising:
 a melting furnace formed with a tapping part at a side of an upper end thereof, having a first filter for removing impurities in molten scrap which was melted in an inner space of the melting furnace, and capable of being tilted toward the tapping part so that molten metal can be tapped through the first filter;   a first cleaning furnace disposed on a side of the melting furnace, having a gas injecting part for injecting an inert gas in the molten metal supplied from the melting furnace and thereby capturing and removing impurities present in the molten metal, and capable of being tilted so that the molten metal from which the impurities have been removed can be tapped;   a second cleaning furnace disposed on a side of the first cleaning furnace, and having a pump which is installed to tap a predetermined amount of the molten metal supplied from the first cleaning furnace and a second filter which is installed on a lower portion of the pump to remove impurities in pumped molten metal; and   an ingot forming furnace disposed on a side of the second cleaning furnace, and configured to form an ingot using the predetermined molten metal supplied from the second cleaning furnace.   
     
     
         2 . The apparatus according to  claim 1 , wherein a closing section is installed on an upper end of each of the melting furnace and the cleaning furnaces to close the upper end. 
     
     
         3 . The apparatus according to  claim 2 , wherein a hydraulic opening and closing device is installed on a distal end of the tapping part. 
     
     
         4 . The apparatus according to  claim 1 , wherein the first filter comprises a metallic filter of 30 to 50 mesh, and the second filter comprises a metallic filter of 200 to 500 mesh. 
     
     
         5 . The apparatus according to  claim 1 , wherein the gas injecting part comprises a valve for controlling supply of the inert gas, a connection pipe connected to the valve to allow the inert gas to flow therethrough, and a porous plate connected to an end of the connection pipe to inject the inert gas. 
     
     
         6 . A method for recycling magnesium alloy scrap, comprising the steps of:
 melting magnesium alloy scrap;   tapping molten scrap by passing it through a first filter, and thereby primarily filtering coarse impurities in molten metal;   conducting a bubbling process by supplying an inert gas into the molten scrap having undergone primary filtering and thereby capturing and separating impurities present in the molten metal;   conducting a precipitation process by maintaining the molten scrap having undergone the bubbling process and thereby precipitating and separating impurities present in the molten metal;   regulating alloy compositions of the molten scrap having undergone the precipitation process; and   pumping a predetermined amount of the molten metal into an ingot mold by passing it through a second filter part, and thereby conducting secondary filtering.   
     
     
         7 . The method according to  claim 6 , wherein the inert gas is supplied in a rate of 0.8 to 1.0 L/min under pressure of 0.2 kg/cm 2 .