公开(公告)号：US20210069729A1

公开(公告)日：2021-03-11

申请号：US16753276

申请日：2018-10-03

Applicant: Vale S.A.

Inventor： Neymayer PEREIRA LIMA ,  Klaydison CARLAILE SILVA ,  Maurício CURI SEGATO

IPC: B03D1/01 ,  B03D1/008 ,  B03C1/00 ,  B03C1/30

Abstract: 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%.