*3.5. Visual Characterization*

For the gravity separation, the macroscope visual observation of the products allowed us to conclude that the heavy fraction (Figure 3b) was rich in metallic elements (many filaments from electronic connectors) and had a low quantity of nonmetallic elements. However, metallic elements were also visible in the light fraction (Figure 3a), but in reduced amounts. In both cases, the separations were satisfactory.

**Figure 3.** Light fraction (**a**) and the heavy fraction (**b**) resulting from gravity separation for the class size of 0.3–0.6 mm.

Nonetheless, for the electrostatic separation, it can be seen in Figure 4b that the product obtained was composed mostly of metals in copper color and some in gray/silver color. On the other hand, the nonconductive fraction, as can be observed in Figure 4a, was mainly made up of a mix of resin and fiberglass, having a green dark color.

**Figure 4.** Nonconductive (**a**) and conductive (**b**) products resulting from electrostatic separation for the class size <0.3 mm.
