BRAIN BOLT on Instagram: "An 11-second clip shows a magnetic drum separator extracting magnetite (Fe₃O₄) from iron-rich black sand. As the green drum spins, powerful internal magnets attract the dark iron particles, forming a dense, brush-like layer on the surface, while the lighter, non-magnetic sand falls away untouched. The separation works because magnetite is strongly ferromagnetic, meaning it responds intensely to magnetic fields. This allows dry magnetic separation systems to achieve effi