METHOD OF AND SYSTEM FOR SMELTING AND REFINING ALUMINIUM ALLOYS, COPPER, BRASS, LEAD AND BRONZE

摘要

The present invention relates to the apparatuses and methods in the field of melting and purification of aluminium, copper, brass, lead and bronze alloys. The plant is preferably composed by two magnetic induction apparatuses, one for melting of raw material and the second for purification of molten metal. Each apparatus comprises a pot or crucible (1, 1'), an electromagnetic apparatus, a filter (11) and a power supply. Each crucible (1, 1') is surrounded in the lower part by a hollow permanent magnet (3, 3') where inside couples of electromagnets arranged in opposition are present. The process consists of the following stages: charging of metallic raw material inside a crucible (1); electromagnetic induction heating and melting of the metallic raw material (2) inside crucible (1) inside a three-phase magnetic system by a horizontal travelling or pulsed magnetic field and creation of a turbulent flux inside the melt (2'); whirling stirring of melt (2') by electromagnetic induction and purification of it with extraction of hydrogen and of non-electroconductive inclusions by coagulation of them in agglomerates; discharging of purified melt (2') by a magneto-hydrodynamic pump for next treatments or technological actions such as the continuous or periodical casting through a filter for the mechanical filtration of the agglomerates.