1. Introduction
Aluminum metal is supplied by two distinct aluminum-production sectors: primary aluminum producers and secondary aluminum smelters [1], [2] and [3]. The primary aluminum industry in the Romania produces aluminum mostly from mined ore (bauxite). Some scrap is also used, which is usually from recycled aluminum beverage cans and industrially generated high-grade aluminum scrap. The continuing growth in aluminum can recycling has increased the value of aluminum, yielded energy savings, and resulted in ecological benefits