Concentration process of iron ore slimes
AssigneeVale S.A.
InventorsNeymayer Pereira Lima, Klaydison Carlaile Silva, Maurício Curi Segato
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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%.
Claims26
A process of concentrating iron minerals from ultrafine tailings (slimes) from processing iron ore comprising:
- a) adjusting a pH of the slimes to a value in the range of 8.5 to 10.5 by adding a base;
- b) adding a collector, wherein the collector comprises an amidoamine cationic collector or a mixture of said amidoamine cationic collector with one or more other collectors, to the slimes and performing conditioning of said collector;
- c) adjusting a pulp percent solids by addition of water;
- d) performing reverse flotation, in the absence of depressant, to obtain an iron rich concentrate;
- and
- e) a high field wet magnetic concentration step.
Dependencies are inferred from the claim text.