Method and plant for grinding old brasques and similar products

Details Method and plant for grinding old brasques and similar products Method and plant for grinding old brasques and similar products

B - Operations, Transporting

02

C

B02C 23/16 (2006.01) B03B 9/04 (2006.01) C25C 3/08 (2006.01)

Patent

CA 2150367

The invention relates to aluminium production plants where processing of old brasques (carbonated products resulting from the demolition of alumina electrolytic cell wall and bottom linings) calls for preliminary reduction of the brasques to small pieces of only a few milimetres in size. The grinding process disclosed involves a crushing operation (12) to reduce the old brasques to pieces no bigger than 50 mm, screening (16) for separating out particles a few milimetres in size and constituting the finished product, and grinding (14) for reducing oversize material to finished product dimensions.

L'invention concerne les usines de production d'aluminium dans lesquelles le traitement des vieilles brasques (produits carbonés provenant de la démolition du revêtement des parois et du fond des cuves d'électrolyse de l'alumine) exige une réduction préalable des brasques en morceaux dont la taille n'excède pas quelques millimètres. Le procédé de broyage objet de l'invention est caractérisé en ce qu'il comporte une opération de concassage (12) dans laquelle les vieilles brasques sont réduites en morceaux dont les dimensions n'excèdent pas 50 mm, une opération de criblage (16) permettant de séparer les grains ayant une taille de quelques millimètres et constituant le produit fini, et une opération de broyage (14) permettant de réduire les refus du criblage aux dimensions du produit fini.

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