Abrégé

The invention relates to a method and device for the purification and separation of purified metal from a metal mother liquid having a specific density and comprising one or more foreign element(s), the method comprising the steps of: providing in a column device a starting material comprising metal crystals and a metal mother liquid comprising at least one foreign element; applying a temperature difference between a relatively hot zone at the upper end of the column and a relatively cool zone at the lower end of the column; a separation step wherein at least a part of the metal crystals is separated from the metal mother liquid by rising of the metal crystals to the upper surface of the metal mother liquid; and a further separation step wherein purified metal floating on the upper surface of the metal mother liquid is discharged from the column device.

Classes IPC  ?

• C22B 21/06 - Affinage
• C22B 9/02 - Affinage par liquation, filtration, centrifugation, distillation ou action d'ultrasons
• B01D 9/00 - Cristallisation

Abrégé

Method for the purification of a molten metal, the molten metal having a specific density and comprising one or more foreign elements which are to be removed, the method comprises the steps of : (a) a cooling step wherein the molten metal is cooled to a eutectic temperature to simultaneously form purified metal crystals and crystals comprising at least one foreign element, and (b) a separation step wherein at least some of the purified metal crystals are separated from the crystals comprising at least one foreign element by adjusting the specific density of the molten metal within a range delimited by a lower value being the specific density of the purified metal crystals and by an upper limit being the specific density of the crystals comprising the at least one foreign element, and wherein the specific density of the molten metal is adjusted to this range by the addition of a metal to alter the specific density of the molten metal and maintained within this range during separation. The proposed method is advantageously applicable for the purification of aluminium melts from recycle aluminium and aluminium scraps.

Classes IPC  ?

• C22B 9/02 - Affinage par liquation, filtration, centrifugation, distillation ou action d'ultrasons
• C22B 21/06 - Affinage

Abrégé

The invention relates to a method for the separation of a dispersion of molten aluminium and solid inclusions formed from a melt of aluminium containing one or more foreign chemical elements. The invention is characterised in that molten aluminium surrounding the solid inclusions is at least essentially replaced by a molten salt.

Classes IPC  ?

• C22B 21/06 - Affinage
• C22B 9/02 - Affinage par liquation, filtration, centrifugation, distillation ou action d'ultrasons