STUDY OF MAKING CASTING GRADE ALUMINUM-SILICON ALLOY WITH COARSE ALUMINUM-SILICON ALLOY PRODUCED BY CARBOTHERMAL REDUCTION OF ALUMINOUS ORE

摘要

The coarse Al-Si alloy produced by a carbothermal reduction of aluminous ore contains 55% aluminum, 25% silicon and some impurities. The main impurities are metallic oxides and iron. The process of manufacturing casting Al-Si alloy with the coarse Al-Si alloy was studied in laboratory. It was found that casting Al-Si alloy conforming to industrial standard can be produced after refined by using purificant and removed iron by using manganese. The content of silicon and iron in the casting alloy reduced with the increase of the dosage of purificant and manganese, but increased with the rise of the filtering temperature.