Abstract
Selective seeding utilizes surface chemistry to bond a desired mineral or minerals to introduced ferromagnetic seeds. Experiments were performed using finely ground Al(OH) 3 (gibbsite), SiO 2 (quartz), and Fe 3 O 4 (magnetite). The mineral particles were screened and only those having grain sizes between 20 and 2 μm were used. The materials were dispersed in a water slurry with 5% solid contents by 100 ppm Na 2 S and/or 100 ppm NaF. Two ppm polyacrylamide-acrylate was employed to flocculate Al(OH) 3 and Fe 3 O 4 . Magnetic separation in a HGMS coarse stainless steel wool model filter removed 73% of the SiO 2 and the Al(OH) 3 was upgraded from 40% to 69% with 93% yield. Repeated dispersal both chemically and mechanically with subsequent flocculation resulted in further upgrading of Al(OH) 3 to 79% with 87% recovery after the 3rd stage. Magnetite was finally recovered at 92% purity with 83% yield.
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