Vale S.a.

Neymayer Pereira Lima

Klaydison Carlaile Silva

Maurício Curi Segato

The present application relates to a concentration process of iron minerals from ultrafine tailings (slimes) from iron ore processing through reverse flotation with pH between 8.5 and 10.5 with the addition of amide-amine type collector, or further a mixture thereof with traditional cationic collectors (amines), in the absence of any depressant, alternatively including a step of high field magnetic concentration, which allows to obtain a concentrate with iron content higher than 66% and contents of SiO2+Al2O3 below 4%.

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Belo Horizonte, Brazil

Neymayer Pereira Lima