C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/24 (2006.01) B01D 15/00 (2006.01) B01J 39/00 (2006.01) B01J 45/00 (2006.01) C22B 3/42 (2006.01) C22B 23/00 (2006.01)
Patent
CA 2648095
The present invention is directed to a hybrid process using ion ex- change resins in the selective recovery of nickel and cobalt of leaching effluents that is comprised of the steps of processing (1 ) the laterite ore (M), which is then treated through leaching (2) (either atmospheric or under pressure), considering solutions from the solid-liquid separation step of existing plants already in operation (2) as well, in a way that the downstream process comprises an ion exchange hybrid circuit, wherein the first ion exchange step (3) with resins (Re) exhibits specific selectivity conditions for the removal of iron, aluminum and copper and an increased pH, and the second ion exchange step (4) allows the removal of nickel and cobalt.
L'invention concerne un procedé hybride utilisant des résines échangeuses d'ions dans la récupération sélective de nickel et de cobalt issus d'effluents de lixiviation. Ce procédé consiste : à traiter (1) le minerai de latérite (M), qui est ensuite traité par lixiviation (2) (soit atmosphérique soit sous pression), en considérant également des solutions de l'étape de séparation solide-liquide de plantes existantes déjà en opération (2), de façon que le procédé en aval comprenne un circuit hybride d'échange d'ions. La première étape d'échange d'ions (3) avec des résines (Re) présente des conditions de sélectivité spécifiques pour la suppression de fer, d'aluminium et de cuivre ainsi qu'un pH augmenté et la seconde étape d'échange d'ions (4) permet la suppression de nickel et de cobalt.
Costa Renato de Souza
Mendes Flavia Dutra
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Companhia Vale Do Rio Doce
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