Ferrous chloride conversion

C - Chemistry – Metallurgy – 01 – G

Patent

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Details

C01G 49/10 (2006.01) C01B 7/01 (2006.01) C01B 7/07 (2006.01)

Patent

CA 2397820

To produce ferric chloride, pickle liquor containing ferrous chloride and fortified with sufficient HC1 is converted to ferric chloride in the presence of oxygen in a tower at a temperature above 132 ~F. The ferric chloride solution from the tower is subjected to evaporation so as to increase the concentration of the ferric chloride. The resultant concentrate is recycled into the tower until a concentration of about 40 % by weight ferric chloride is obtained. A gas phase from either or both of the tower and the evaporator is scrubbed in order to remove HC1 which can be used to fortify the pickle liquor.

L'invention concerne la production de chlorure ferrique pour laquelle une liqueur de décapage, contenant du chlorure ferreux et fortifiée avec suffisamment de HCl, est transformée en chlorure ferrique en présence d'oxygène dans une colonne à une température supérieure à 132 ·F. La solution de chlorure ferrique provenant de la colonne est soumise à évaporation de façon à augmenter la concentration du chlorure ferrique. Le concentré obtenu est recyclé dans la colonne jusqu'à obtention d'une concentration d'environ 40 % en pds de chlorure ferrique. Une phase gazeuse de la tour et/ou de l'évaporteur est purifiée afin d'éliminer le HCl qui peut être utilisé pour fortifier la liqueusoumise r de décapage.

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