Improved method and apparatus for concentrating a slurry

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 61/00 (2006.01) B01D 61/12 (2006.01) B01D 61/14 (2006.01) B01D 61/18 (2006.01)

Patent

CA 2583862

The current invention provides improved methods and filter stacks for concentrating a slurry of titanium dioxide. The improved filter stack comprises a series of filter disks and diverter trays arranged in parallel. The present invention provides an improvement over prior art filter stacks by using a substantially complete weld to attach a diverter plate to the diverter trays. The current invention also provides an improved method for pre- conditioning a filter stack. The improved method is designed to pre-condition and gradually prepare the filter stack for production of the desired slurry of titanium dioxide. Further, the current invention provides an improved process for preparing and transporting a slurry of titanium dioxide. Finally, the current invention provides a method for enhancing the lifespan of a filter stack. The method for enhancing the lifespan of the filter stack continuously monitors the flow rate and specific gravity of fluids produced from the filter stack and signals the need for flushing of the filter stack.

L'invention concerne des procédés et des filtres empilés pour concentrer une solution épaisse de dioxyde de titane. Les filtres empilés comprennent une série des disques filtrants et des plateaux de déviation disposés en parallèle. L'invention apporte une amélioration comparativement aux filtres empilés de l'art antérieur, par utilisation d'une soudure sensiblement entière pour fixer un plateau de déviation aux plateaux de déviation. L'invention concerne également un procédé amélioré de préconditionnement d'une pile de filtres. Ledit procédé amélioré est conçu de manière à préconditionner et à préparer progressivement la pile de filtres afin de produire la suspension épaisse de dioxyde de titane voulue. L'invention concerne en outre un processus amélioré pour préparer et transporter une suspension épaisse de dioxyde de titane. Pour finir, l'invention concerne un procédé permettant d'augmenter la durée de vie d'une pile de filtres. Le procédé permettant d'augmenter la durée de vie d'une pile de filtres contrôle en continu le débit et la gravité spécifique de fluides produits à partir de la pile de filtres et indique le besoin de lavage par chasse d'eau de la pile de filtres.

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