PROCESS FOR RECYCLING ALUMINIUM ALLOY SCRAP COMING FROM THE AERONAUTICAL INDUSTRY

摘要

FIELD: metal industry.; SUBSTANCE: invention relates to a manufacturing process for a remelt block containing aluminum designed for making aluminum alloy for the aircraft industry in which scrap containing mainly aluminum alloys 2XXX or series 7XXX series used in the aircraft industry is supplied during a supply stage, the scrap is melted in a smelting furnace in order to obtain an initial molten metal bath during a smelting stage, the initial molten metal bath is subjected to purification by crystallization in order to obtain a solidified mass and a bath of residual liquid, and the solidified mass is recovered in order to obtain a remelt block during a recovery stage. All the metal is initially charged and then subjected to fractional crystallization; the crystallization speed given as the mass of formed crystals, expressed as a percentage of the weight initially charged, per hour of crystallization, being between about 3.8%/h and about 6.2%/h. Another subject of the invention is a manufacturing process for a semi-finished product and an alloy for the aircraft industry, typically an alloy of series 2XXX or series 7XXX is produced; this alloy is cast in the shape of a semi-finished product.; EFFECT: purification urify scrap of series 2XXX or series 7XXX alloys for iron and silicon, without eliminating additive elements such as zinc, copper and magnesium.;25 cl, 3 dwg, 1 ex, 2 tbl