METHOD OF REFINING OF ALUMINUM AND ALUMINUM-BASE ALLOYS Russian patent published in 1998 - IPC

FIELD: refining of aluminum melts from impurities, for instance, from alkali metals, hydrogen and nonmetallic inclusions. SUBSTANCE: the offered method includes treatment of continuous flow of melt with fluxes containing chlorides and fluorides of alkali metals with its simultaneous mixing by mixer and separation of metal from reaction products, introduction into fluxes of titanium and boron fluorides with relation to chlorides and fluorides of alkali metals in ratio of (7-9):(3-1). In so doing, melt is mixed at the rate exceeding that of melt flow by a factor of 20-30 and flux is introduced into vertex funnel formed by mixer when its depth equals 0.3-0.4 of depth of mixer submersion into melt. Refining degree rises: with respect to oxide inclusions, by 50%; hydrogen, about 60%; sodium, practically, at the level of nearest analog. Size, of micrograin reduces by more than one order of magnitude that makes it possible to prognosticate improvement of physical and mechanical properties of alloy. Consumption of flux reduces, and productivity of process, as a whole, increases as there is no additional expenditure of time for refining treatment. EFFECT: higher productivity of the process, reduced losses of metal and consumption of flux due to its introduction at the stage of teeming, and higher quality of ready alloy due to achievement of additional effect of modification. 1 dwg