DEVICE AND METHOD FOR THE PURIFICATION OF AN ADDITION TO ONE OR MORE CONTAMINATION ESSENTIALLY AN ALLOY IN PARTICULAR ALUMINIUM CONTAINING MELT.

摘要

Apparatus for purifying a melt which, besides one or more impurities to be volatilized, contains essentially a light metal, in particular aluminum. The apparatus comprises a vacuum processing vessel (4), a vacuum pump (P), one or more conduits for supplying the melt to the vacuum processing vessel and means (12) for spraying the melt into the vacuum processing vessel. According to the invention, the vacuum processing vessel is provided with discharge means (7) for discharging impurities expelled from the melt. The discharge means are connected to a means for separating the impurities in solid or liquid form, connected to the vacuum pump used for maintaining the subatmospheric pressure in the vacuum processing vessel. Connected to the vacuum processing vessel are at least one supply conduit (9) and one return conduit (10) for the melt, the supply conduit being provided with a pump (11) for the melt to be purified and a spray nozzle (12) for atomizing the melt supplied by the pump into the vacuum processing vessel. During the purification treatment, a subatmospheric pressure is maintained in the apparatus by the vacuum pump and the temperature of the melt is maintained at 600 DEG C-900 DEG C.