A closed circuit, dry processing system for processing aluminum containing products and producing reusable particles of aluminum, and a process thereof. The aluminum containing products are crushed into chips which are then separated into iron-based and ironless chips. The ironless chips are further crushed into chip fragments which are controllably supplied into a granulation chamber where the chip fragments are granulated into spheroidal particles of aluminum and other particles of organic and carbonic materials. A controlled upward airflow produced in the granulation chamber draws those of the particles exceeding a desired granulation degree out of the granulation chamber. The particles are classified as a function of their sizes and then separated as a function of their weight so that the spheroidal particles of aluminum forming the reusable particles of aluminum and residues formed by the other particles are released separately.