Particle agglomeration by metal sulphate hydration

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 1/243 (2006.01) C22B 1/14 (2006.01) C22B 1/24 (2006.01) C22B 7/02 (2006.01)

Patent

CA 2265873

An agglomeration process for metallurgical by-products and waste products is described, utilizing the sulphate material present in the metallurgical waste and by-products, which involves reacting the sulphate with water and optionally with an added alkaline earth metal compound. Sulphuric acid may also be added to the particles to be agglomerated. The obtained mixture is extruded or cast, and allowed to harden before being used in recycling to an extractive process. The agglomeration mechanism involves one or more of, hydration of a water soluble sulphate, precipitation of a water insoluble alkaline earth metal sulphate and hydration of a water insoluble sulphate.

L'invention concerne un procédé qui permet d'agglomérer des sous-produits et des déchets métallurgiques en utilisant les sulfates présents dans lesdits sous-produits et déchets. Selon le procédé, on fait réagir le sulfate avec de l'eau et éventuellement avec un composé d'un métal alcalino-terreux ajouté. On peut également ajouter de l'acide sulfurique aux particules à agglomérer. On extrude ou on coule le mélange obtenu, puis on le laisse durcir avant de l'utiliser pour le recyclage vers un procédé d'extraction. Le mécanisme d'agglomération met en jeu un ou plusieurs processus suivants: hydratation d'un sulfate soluble dans l'eau, précipitation d'un sulfate d'un métal alcalino-terreux insoluble dans l'eau et hydratation d'un sulfate insoluble dans l'eau.

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