Method for utilising steelworks dust

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 7/02 (2006.01) C22B 7/00 (2006.01) C22B 19/20 (2006.01) C22B 19/30 (2006.01)

Patent

CA 2400854

The invention concerns a method for upgrading steel plant dust to recuperate industrially reusable compounds. Said method comprises an attrition and dilution step, a solid/liquid separating and solid washing step, an acid leaching step, and acid purification step comprising a cementation reaction or a cementation and decalcification reaction. Said method is characterised in that it comprises an oxidation/neutralisation step which includes a step oxidizing iron into iron oxyhydroxides and/or iron oxides and a neutralising reaction of the reaction medium.

L'invention a pour objet un Procédé de valorisation de poussières d'aciéries en vue de récupérer des composés réutilisables industriellement, ledit procédé comportant une étape d'attrition et de dilution, une étape de séparation solide/liquide et de lavage du solide, une étape de lixiviation acide, une étape de purification acide comprenant une réaction de cémentation ou une réaction de cémentation et de décalcification, ledit procédé étant caractérisé en ce qu'il comprend une étape d'oxydation/neutralisation, étape comprenant une réaction d'oxydation du fer en oxyhydroxydes de fer et/ou en oxydes de fer et une réaction de neutralisation du milieu réactionnel.

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