아크 전기로 알루미나 용융공정에서 입도에 따른 전력 및 전극봉 특성

Abstract

Factors to be considered in the melting of alumina in arc electric furnaces should be observed for excessive power consumption and changes in graphite electrode rod mixing consumption. The arc electric furnace is different from a general induction furnace, in which the charged material is directly exposed to the electric arc and alumina is directly contacted and charged; therefore, alumina was melted by using heat with a large current. The size of the alumina to be melted is between 50 and 90 μm. For this reason, it is necessary to purchase more than 98% of the raw materials for manufacture of alumina in consideration of the size of the input at the time of purchase. The size of the inlet causes the quality and economic loss of melted alumina, such as power usage and impurities in electrode bars. In this thesis, the power consumption and condition characteristics of graphite electrode rods were investigated, which are two aspects of alumina size's perspective on melting with arc electricity. Based on these data, the operation criteria were prepared based on the reference values of electric power consumption and characteristics of the electrode rods during melting process with a change of the size of alumina raw materials. It is believed that this can lead to improved operation of the arc electric furnace by creating more scientific and systematic standards, proper power consumption, and minimization of graphite electrode consumption, thereby reducing economic losses.