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 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.

A metal removal agent used when removing Mg from an aluminum alloy melt whose raw material is scrap or the like and used for formation of a molten salt layer that takes in Mg from an aluminum alloy melt. The metal removal agent contains: a specific metal element one or more of Cu, Zn, or Mn; a specific halogen element one or more of Cl or Br; and Mg. The metal removal agent may also contain: a base halide that serves as a base material of the molten salt layer; and a specific metal halide that is a compound of a specific metal element and a specific halogen element. When the molten salt layer formed using the agent and the aluminum alloy melt containing Mg are brought into contact with each other, Mg is taken into the molten salt layer side from the aluminum alloy melt side and efficiently removed.

A rotary injector comprising an elongated shaft having a proximal end and a distal end, and an impeller at the distal end of the elongated shaft, the elongated shaft and the impeller being collectively rotatable during operation around an axis of the shaft, the rotary injector being hollow and having an internal supply conduit extending along the shaft and across the impeller, the supply conduit having an inlet at the proximal end of the shaft, a main portion extending from the inlet to a discharge portion, the discharge portion extending to an axial outlet, the discharge portion having a narrow end connecting the main portion of the supply conduit and a broader end at the axial outlet.

Disclosed is a flux injector assembly and method for refining a molten material, wherein at least a portion of the material is aluminum, as it flows through a trough. A dispensing rod having a hollow body and a dispensing rim is configured to allow a flux and/or inert gas to travel through the hollow body and be injected into the molten material through the dispensing rim as the molten material flows through the trough. A baffle plate is configured to be positioned within the molten material in the associated trough to allow the molten material to flow passed the baffle plate. The elongated dispensing rod is positioned at a downstream location relative to the baffle plate. The rate of flow of molten material is increased as it passes the dispensing rim of the elongated dispensing rod to inject and mix the flux within the molten aluminum alloy.

A solid metal flux comprised of compacted granules including (a) alkali chloride salt, (b) alkaline earth chloride salt and (c) at least one nitrate, carbonate, or sulfate salt and/or a fluoride containing salt.

Systems, methods, and apparatus for treating a molten metal are provided. A metal treatment system, comprising: a wire feeding subsystem; and a cored wire; wherein the wire feeding subsystem feeds the cored wire into a metal bath at a controlled wire feed rate, and wherein the metal bath comprises a molten metal; wherein the cored wire comprises: a consumable outer sheath having a tubular cross section; and a core fill material coupled to an inner surface of the outer sheath, wherein the core fill material comprises a refining agent for refining the molten metal; and wherein the refining agent reacts with the molten metal, thereby causing an impurity to be removable from the metal bath.

A method for recycling an aluminum alloy scrap includes performing selective oxidation roasting and washing treatment on the aluminum alloy scrap to obtain an uncoated aluminum alloy scrap; melting the uncoated aluminum alloy scrap in a refining furnace to obtain aluminum alloy melt liquid, online-detecting components of the aluminum alloy melt liquid and adding a metallic copper, a copper alloy, a magnesium alloy or a zinc alloy to the aluminum alloy melt liquid according to the requirements of target alloy components, performing pressure-controlled and oxygen-controlled melting through regulating pressure intensity and oxygen partial pressure in the refining furnace and coupling an external-field stirring mode to obtain refining aluminum alloy melt liquid; filtering the refining aluminum alloy melt liquid, to obtain an aluminum alloy melt with the target alloy components; and casting the aluminum alloy melt.

Disclosed is a flux injector assembly and method for refining a molten material, wherein at least a portion of the material is aluminum, as it flows through a trough. A dispensing rod having a hollow body and a dispensing rim is configured to allow a flux and/or inert gas to travel through the hollow body and be injected into the molten material through the dispensing rim as the molten material flows through the trough. A baffle plate is configured to be positioned within the molten material in the associated trough to allow the molten material to flow passed the baffle plate. The elongated dispensing rod is positioned at a downstream location relative to the baffle plate. The rate of flow of molten material is increased as it passes the dispensing rim of the elongated dispensing rod to inject and mix the flux within the molten aluminum alloy.

A salt flux and method for use of the same in cleaning and purifying molten aluminum is disclosed. The salt flux includes an equal proportion of sodium chloride and potassium chloride in a range of ninety percent or more, by weight, of the salt flux. The salt flux further includes aluminum fluoride in a range of less than ten percent by weight. The salt flux is introduced into a furnace using a submergence system such as a side well with an impeller to submerge the salt flux under the surface of the metal bath. Oxides may be collected and removed to reduce inclusions, oxide, and magnesium levels within the metal bath.