Process and apparatus for treating exhausted abrasive...

B - Operations – Transporting – 24 – B

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B24B 57/00 (2006.01) B01D 21/00 (2006.01) B03B 9/06 (2006.01) B04B 5/10 (2006.01) B04C 7/00 (2006.01)

Patent

CA 2613475

Process for completely recovering the reusable components of an abrasive slurry used in slicing crystalline materials of silicon, quartz or ceramics when it becomes exhausted and enriched with undesired waste matter. The process consists of an initial centrifuge separation of the exhausted slurry as such and of a wet size-sorting treatment of the fraction containing the abrasive grains obtained from the centrifuge, carried out in a battery of hydrocyclones or centrifuges connected in series. The section for the recovery and purification of the abrasive grains comprises a multifunctional apparatus that performs all the required operations within a single pressure vessel. The process enables the complete recovery of the reusable abrasive grains contained in the exhausted slurry as well as of the suspending or cutting liquid of the abrasive slurry, in order to reuse both components in the manufacturing process. The invention also concerns an apparatus for carrying out the treatment of exhausted abrasive slurries according to the process described.

Ce procédé de récupération complet des composants réutilisables d'une boue abrasive est utilisé dans la découpe de substances cristallines de silicium, quartz ou céramique après enrichissement avec des déchets indésirables. Le procédé comprend la séparation par centrifugation initiale de la boue à proprement parler et d'un traitement de tri par taille humide de la fraction contenant les grains abrasifs obtenues à partir de la centrifugation utilisé dans une batterie d'hydrocyclones ou de centrifugeuses connecté(e)s en série. La section de récupération et de purification des grains abrasifs comprend un appareil polyvalent réalisant toutes les opérations nécessaires dans une seule cuve sous pression. Ce procédé permet la récupération complète des grains abrasifs réutilisables contenus dans la boue et la suspension ou découpe de la boue abrasive afin de réutiliser les deux composants intervenant dans la fabrication. L'appareil permet le traitement de boues abrasives d'après le procédé décrit.

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