Synthesis of compounds of impurities with chemically active additives in liquid aluminum and gallium

The method of binding of impurities in liquid metal by means of formation of intermetallic compounds (IMC) with the active additives has been developed to improve the quality of nonferrous metals. The special technological process promotes the growth of IMC microcrystalls and separation of suspensions. The probability of impurity removal from draft metal is estimated on the basis of Delimarsky and Karapetjants formulas. Purification of gallium was carried out by introduction of approximately 1% of sodium or lithium. Results of calculation and experiment are in good agreement. Efficiency of purification from impurities increases in a sequence Zn<Sn<Pb<Bi. Removal of silicon from liquid aluminum by separation of IMC with grafitized fabrics has allowed to arrange additives of active metal by efficiency of removal in a sequence Mg<Ca<Sr and Sc<Y<Ba