A method with which Mg can be removed from aluminum alloy melt whose raw material is scrap or the like. Metal removal method includes processing step of forming molten salt layer in contact with aluminum alloy melt containing Mg which covers at least part of the surface of the aluminum alloy melt. This method allows Mg to be taken in from aluminum alloy melt to molten salt layer and removed. Molten salt layer contains specific halogen element that is one or more of Cl or Br and specific metal element that is one or more of Cu, Zn, or Mn. The specific metal element is supplied as an oxide of the specific metal element to the molten salt layer. At that time, the molten salt layer contains Mg. The step of removing Mg is performed by disposing a conductor that bridges the aluminum alloy melt and the molten salt layer.

A degassing launder having a plurality of partition plates configured to block a flow of molten aluminum and including a plurality of domes. Two adjacent partition plates and two side walls of the launder form a degassing chamber. A lower portion of the partition plates is provided with a passage through which the molten aluminum flows into a next degassing chamber. The domes are arranged on the bottom of the launder.

A degassing launder having a plurality of partition plates configured to block a flow of molten aluminum and including a plurality of domes. Two adjacent partition plates and two side walls of the launder form a degassing chamber. A lower portion of the partition plates is provided with a passage through which the molten aluminum flows into a next degassing chamber. The domes are arranged on the bottom of the launder.

An apparatus and method for filtering molten metal (M), such as aluminum or an aluminum alloy includes at least one ceramic foam filter or any other type of filtration media such as porous tube or alumina balls disposed in a receptacle (12) for the molten metal (M). A vibrator vibrates at least one of the filter, the receptacle (12) or the metal and may be used to induce priming, filtering and/or drainage of the filter. The vibrator may be retrofitted to an existing filter system and may be adjustable in frequency and amplitude. The vibration may be continuous over a given period or produced in a single shock.

A metal purifying method having: a local heating step of heating an aluminum-based molten metal in a first region on a molten metal surface of the aluminum-based molten metal; and a local low pressure step of lowering the pressure in a second region on the molten metal surface to a pressure lower than the pressure in the first region. The second region is different from the first region. This allows a specific element to be vaporized from the second region to purify the aluminum-based molten metal. The specific element is one or more of Zn, Mg, or Pb having a saturated vapor pressure higher than that of Al. This is effective not only in a purifying method for removing a specific element from an aluminum-based molten metal but also in a method of recovering a specific element, which can be a resource, from an aluminum-based molten metal.

A Mg removal agent is composed of a chloride and copper oxide. The chloride contains at least Mg and one or more base metal elements selected from K, Na, and Ca. The chloride contains, for example, 0.2 to 60 mass % of MgCl.sub.2 and/or 40 to 99.8 mass % of KCl with respect to the chloride as a whole. The compounding ratio that is a mass ratio of the chloride to the copper oxide is, for example, 0.15 or more. The chloride may be a re-solidified salt or a mixed salt. At least a part of the chloride may be a mineral containing the base metal elements and Mg or a mineral-derived chloride. A preferred example of the Mg removal agent is granular flux introduced into the aluminum alloy molten metal.

An apparatus and method for filtering molten metal (M), such as aluminum or an aluminum alloy includes at least one ceramic foam filter or any other type of filtration media such as porous tube or alumina balls disposed in a receptacle (12) for the molten metal (M). A vibrator vibrates at least one of the filter, the receptacle (12) or the metal and may be used to induce priming, filtering and/or drainage of the filter. The vibrator may be retrofitted to an existing filter system and may be adjustable in frequency and amplitude. The vibration may be continuous over a given period or produced in a single shock.

Liquid metal degassing device comprising a chamber containing a liquid metal bath, a device for circulating a gas through a purification chamber and in that the purification chamber comprises a getter material configured to trap dihydrogen from the circulating gas. Method for degassing a liquid metal bath to reduce the hydrogen concentration of the liquid metal comprising the following steps a) Preparing a liquid metal bath, preferably an aluminum alloy b) Circulating a gas, c) Exchanging hydrogen from the circulating gas with the liquid metal such that the hydrogen dissolved in the liquid metal bath diffuses into the circulating gas and enriches the circulating gas with dihydrogen, d) Purifying the circulating gas enriched with dihydrogen in a purification chamber comprising a getter material configured to trap dihydrogen from the circulating gas.

The present invention provides an automated device for degassing and/or foaming of metals and their alloys and process thereof. Said automated device for degassing and/or foaming of molten metals and their alloys and a process facilitates in controlled degassing and/or foaming of molten metals and thereby increases tensile strength, impact strength, hardness, malleability, corrosion resistance, conductivity of metals and their alloys and further eliminates the use of harmful chemicals and injectable gases in degasification of metal and alloys. Present automated device mainly comprises of plurality of sonic generator 1, controller 2, first assembly 3, second assembly 4, third assembly 5, fourth assembly 6. Said process comprises of steps including; 1. Selecting the mode of operation and setting parameters; 2. Activating said assemblies and facilitating Formation of ultrasonic cavitation in metal and their alloys; 3. Degassing of the molten metal and their alloys due to formation of micro bubbles.

The present invention provides an automated device for degassing and/or foaming of metals and their alloys and process thereof. Said automated device for degassing and/or foaming of molten metals and their alloys and a process facilitates in controlled degassing and/or foaming of molten metals and thereby increases tensile strength, impact strength, hardness, malleability, corrosion resistance, conductivity of metals and their alloys and further eliminates the use of harmful chemicals and injectable gases in degasification of metal and alloys. Present automated device mainly comprises of plurality of sonic generator 1, controller 2, first assembly 3, second assembly 4, third assembly 5, fourth assembly 6. Said process comprises of steps including; 1. Selecting the mode of operation and setting parameters; 2. Activating said assemblies and facilitating Formation of ultrasonic cavitation in metal and their alloys; 3. Degassing of the molten metal and their alloys due to formation of micro bubbles.