Method for the insolubilisation and consolidation of used...

C - Chemistry – Metallurgy – 04 – B

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C04B 18/02 (2006.01) B09B 3/00 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2273004

The invention concerns a method for the insolubilisation and consolidation in the form of pellets of used brasques from electrolyte vessels for producing aluminium comprising the grinding of said brasques and mixing them closely with various refractory pulverulent additives before burning characterised in that it consists in: introducing a first additive selected from the group of aluminium silicates for fixing the alkaline metals during burning; introducing a second additive which, during burning, will combine with the saturating fluorine-containing compounds to form new stable and insoluble compounds and by its non-combined supernatant fraction, will ensure the consolidation of the mixture, and this additive is selected from the group of calcium oxides and salts and preferably of lime cements and mortars; carrying out a forming by agglomerating in the form of pellets the close mixture of used ground brasques with said first and second pulverulent additives before burning at a temperature between 700 DEG C and 950 DEG C.

Procédé d'insolubilisation et de consolidation sous forme de boulettes de brasques usées provenant des cuves d'électrolyse pour la production d'aluminium comportant le broyage desdites brasques ainsi que leur mélange intime avec divers additifs pulvérulents réfractaires avant cuisson caractérisé en ce qu'après introduction: d'un premier additif destiné lors de la cuisson à fixer les métaux alcalins, et choisi dans le groupe des silicoaluminates, puis d'un second additif destiné lors de la cuisson, d'une part, à se combiner avec les composés fluorés d'imprégnation pour former de nouveaux composés stables et insolubles, d'autre part, par sa fraction excédentaire non combinée, à assurer la consolidation du mélange, et choisi dans le groupe des oxydes et sels de calcium et de préférence des ciments et mortiers calcaires, on effectue une mise en forme par agglomération sous forme de boulettes du mélange intime de vieilles brasques broyées avec lesdits premier et second additifs pulvérulents avant cuisson à une température comprise entre 700 °C et 950 °C.

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